Merge pull request 'feature/http_call_send_json' (#3) from feature/http_call_send_json into master

Reviewed-on: #3

.gitignore

@@ -4,3 +4,4 @@ firmware/.DS_Store
 schematics/#auto_saved_files#
 schematics/_autosave-oko-weatherstation.sch
 firmware.ino.bin
+firmware/extract me in arduino libraries folder.zip

firmware/.vscode/c_cpp_properties.json

@@ -0,0 +1,20 @@
+{
+    "configurations": [
+        {
+            "name": "Mac",
+            "includePath": [
+                "${workspaceFolder}/**",
+                "/Users/klaute/Documents/Arduino/libraries"
+            ],
+            "defines": [],
+            "macFrameworkPath": [
+                "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks"
+            ],
+            "compilerPath": "/usr/bin/clang",
+            "cStandard": "c17",
+            "cppStandard": "c++17",
+            "intelliSenseMode": "macos-clang-arm64"
+        }
+    ],
+    "version": 4
+}

firmware/config.h

@@ -3,18 +3,21 @@
 
 // config general setting and behavior of the weatherstation
 
-#define WIFI_AUTOCONNECT_TIMEOUT_S      120
+#define WIFI_AUTOCONNECT_TIMEOUT_S       60
 #define WIFI_CONFIG_PORTAL_TIMEOUT_S    120
 #define UPDATE_SENSOR_INTERVAL_S        300
-#define UPDATE_WEBSERVER_INTVERVAL_S      1 // Do not change, bigger values will prevent using webupdater webinterface
-#define DELAY_LOOP_MS                    50
+#define UPDATE_WEBSERVER_INTVERVAL_MS   500 // Values greater than 1000 will negative affect availability of the webinterface
+#define DELAY_LOOP_MS                   100
 #define POWERSAVING_SLEEP_S             600
 #define EMERGENCY_SLEEP_S            172800 // Sleep for 2 days to recover
-#define RESET_ESP_TIME_INTERVAL_MS   (60*60*3*1000) // (60*60*6*1000) // reset every 3 hours
+#define RESET_ESP_TIME_INTERVAL_MS   (60*60*12*1000) // reset every 12 hours
 #define WIND_SENSOR_MEAS_TIME_S          15
-#define INITIAL_WEBSERVER_TIME           20
+#define WATCHDOG_TIMEOUT_MS           30000
+#define WIFI_CHECK_INTERVAL_MS       120000
+#define INFLUXDB_TIMEOUT_MS            1000
 
 #define ENERGY_SAVING_ITERATIONS         30
+
 #define WIFI_MINIMUM_SIGNAL_QUALITY      10 // percent
 
 #define BAT_LOW_VOLTAGE                 3.6
@@ -39,6 +42,10 @@
 #define BME_CS   10
 #define BME_ADDRESS 0x76
 
+#define BMP_ADDRESS 0x76
+
+#define SERIAL_BAUD_RATE 115200
+
 #define WEB_UPDATER_HTTP_PORT  8080
 
 #endif

firmware/config_user.h.example

@@ -1,6 +1,5 @@
 // Copy this file to config_user.h and adjust it to your needs.
 
-
 #ifndef __CONFIG_USER_H__
 #define __CONFIG_USER_H__
 
@@ -12,35 +11,59 @@
 // maybe have a TOO LONG SSID!
 String DEVICE_NAME = "weatherstation";
 
-// Enable/Disable features
-//#define WEBUPDATER_FEATURE
+/********************************************************************************/
+
+// Enable/Disable general features
+#define BATTERY_POWERED
+
+// retries to connect after 5 seconds or starts the wifimanager
+//#define SLEEP_IF_NO_WLAN_CONNECTION
+
 #define INFLUXDB_FEATURE
 #define INFLUXDB_VERSION 1 // 1 or 2
-#define SERIAL_FEATURE
-//#define BATTERY_POWERED
-//#define SENSOR_WIND
+//#define LOG_MILLIS_TO_INFLUXDB
+
+//#define SERIAL_FEATURE
+
+#define SENSOR_WIND
 #define SENSOR_APDS9960
 //#define SENSOR_APDS9930
 #define SENSOR_BME280
+//#define SENSOR_BMP280
 #define SENSOR_BATTERY
-//#define BAT_PINS_D34
-// Homebridge Webstat is only possible if webupdater is also enabled
-//#define HOMEBRIDGE_WEBSTAT
-// retries to connect after 5 seconds or starts the wifimanager
-#define SLEEP_IF_NO_WLAN_CONNECTION
-// Restarts the firmware every n seconds
-//#define RESET_ESP_TIMEINTERVAL // BETA STATUS
-//#define HTTP_CALL_ON_WINDSPEED_EXCEED  // BETA STATUS
-//#define DEBUG_WINDSPEED_MEASUREMENT   // for debugging windspeed measurement only
-//#define LOG_MILLIS_TO_INFLUXDB
-//#define ENABLE_WATCHDOG
-//#define WATCHDOG_TIMEOUT_MS 30000
 
+//#define BAT_PINS_D34
+
+/********************************************************************************/
+// not available or recommended for battery mode
+/********************************************************************************/
+
+//#define DISABLE_WIFIMANAGER
+// Restarts the firmware every n seconds
+//#define RESET_ESP_TIME_INTERVAL
+//#define ENABLE_WATCHDOG
+//#define WEBUPDATER_FEATURE
+// only available in case that webupdater is enabled
+//#define USE_LOGGER
+// only possible if webupdater is also enabled
+//#define HOMEBRIDGE_WEBSTAT
+// for debugging windspeed measurement only, trigger and results are handled by webupdater
+//#define DEBUG_WINDSPEED_MEASUREMENT
+//#define HTTP_CALL_ON_WINDSPEED_EXCEED
+//#define HTTP_CALL_SEND_JSON_DATA
+//#define SHOW_SENSOR_DATA_ON_WEBUPDATER_MAIN_PAGE
+
+/********************************************************************************/
+
+// measurement correction factors
 const float HUMIDITY_FACTOR = 1.0;
 const float LIGHT_FACTOR    = 1.0;
 const float TEMP_FACTOR     = 1.0;
 
-// InfluxDB credentials
+/********************************************************************************/
+
+
+// InfluxDB1 credentials
 const char     *INFLUXDB_HOST = "hostname";
 const uint16_t  INFLUXDB_PORT = 80;
 const char     *INFLUXDB_DB   = "database";
@@ -53,13 +76,17 @@ const char *INFLUXDB_URL    = "http://192.168.0.123:3124";
 const char *INFLUXDB_ORG    = "home_org";
 const char *INFLUXDB_BUCKET = "mybucket";
 const char *INFLUXDB_TOKEN  = "your api token";
-*/
+
+/********************************************************************************/
 
 // enable HTTP_CALL_ON_WINDSPEED_EXCEED to enable this feature
 #define HTTP_CALL_ON_WINDSPEED_EXCEED_MPS  5.0 // 5.0 m/s == 18 km/h
 #define HTTP_CALL_ON_WINDSPEED_INTERVAL_S   60 // it's required to be bigger than WIND_SENSOR_MEAS_TIME_S
 #define HTTP_CALL_ON_WINDSPEED_URL         "http://192.168.178.100:3001/button-windspeedexceed?event=click"
 
+#define HTTP_CALL_SEND_JSON_DATA_INTERVAL_S 300
+#define HTTP_CALL_SEND_JSON_DATA_URL        "http://192.168.178.123:80/html/index.html?json_weather_data="
+
 // anemometer settings
 // thingiverse anemometer settings: https://www.thingiverse.com/thing:2559929/files
 #define ROTOR_LENGTH_CM                             8.25
@@ -76,5 +103,20 @@ const char *INFLUXDB_TOKEN  = "your api token";
 // china aliexpress anemometer settings (calculation unknown) <add link here>
 //#define WINDSPEED_FACTOR 2.4
 
+/********************************************************************************/
+
+#ifdef DISABLE_WIFIMANAGER
+  // Set your Static IP address
+  IPAddress local_IP(192, 168, 178, 123);
+  // Set your Gateway IP address
+  IPAddress gateway(192, 168, 178, 1);
+  // Set subnet mask
+  IPAddress subnet(255, 255, 255, 0);
+
+  #define WIFI_SSID   "myWifi"         // WLAN Netzwerk
+  #define WIFI_PASSWD "myPass"   // WLAN Passwort
 #endif
 
+/********************************************************************************/
+
+#endif

firmware/constants.h

@@ -18,4 +18,27 @@
 #define ENERGY_SAVE_MODE_ENABLED     1.0
 #define ENERGY_SAVE_MODE_DISABLED    0.0
 
+#define FSM_STATE_1   0
+#define FSM_STATE_2   1
+#define FSM_STATE_3   2
+#define FSM_STATE_4   3
+#define FSM_STATE_5   4
+#define FSM_STATE_6   5
+#define FSM_STATE_7   6
+#define FSM_STATE_8   7
+#define FSM_STATE_9   8
+#define FSM_STATE_10  9
+#define FSM_STATE_11 10
+#define FSM_STATE_12 11
+
+const String hb_ws_msg_start     = "{";
+const String hb_ws_msg_temp      = "\"temperature\": ";
+const String hb_ws_msg_humi      = "\"humidity\": ";
+const String hb_ws_msg_light     = "\"lightlevel\": ";
+const String hb_ws_msg_windspeed = "\"windspeed\": ";
+const String hb_ws_msg_pressure  = "\"pressure\": ";
+const String hb_ws_msg_timestamp = "\"timestamp\": ";
+const String hb_ws_msg_valid     = "\"valid\": ";
+const String hb_ws_msg_end       = "}";
+
 #endif

firmware/firmware.ino

@@ -1,19 +1,27 @@
 // Standard ESP8266 libs from project folder
 #include <ESP8266mDNS.h>
-#include <ESP8266HTTPUpdateServer.h>
 #include <ESP8266WiFi.h>
-#include <DNSServer.h>
-#include <ESP8266WebServer.h>
-#include <ESP8266HTTPClient.h>
 
 #include <WiFiClient.h>  // WiFiClient
-#include <WiFiManager.h> // WiFiManager from bib manager
 
 // Project includes
 #include "constants.h"
 #include "config.h"
 #include "config_user.h"
 
+#ifndef DISABLE_WIFIMANAGER
+#include <WiFiManager.h>  // WiFiManager from bib manager
+#endif
+
+#ifdef HTTP_CALL_ON_WINDSPEED_EXCEED
+#include <ESP8266HTTPClient.h>
+#endif
+
+#ifdef HTTP_CALL_SEND_JSON_DATA
+#include <ESP8266HTTPClient.h>
+#include <UrlEncode.h> // from bib manager UrlEncode by Masayuki
+#endif
+
 //*************************************************************************//
 // check if some settings are correct
 
@@ -26,42 +34,61 @@
 //*************************************************************************//
 // constant variables
 
-const uint8_t VALUES = 8; // see constants.h file - count of number of SENSOR_ defines
-float currentSensorData[VALUES] = {nanf("no value"), nanf("no value"), nanf("no value"), nanf("no value"), nanf("no value"), nanf("no value"), nanf("no value"), nanf("no value")};
-float (*sensors[VALUES])() = {};
+const uint8_t VALUES = 8;  // see constants.h file - count of number of SENSOR_ defines
+float currentSensorData[VALUES] = { nanf("no value"), nanf("no value"), nanf("no value"),
+                                    nanf("no value"), nanf("no value"), nanf("no value"),
+                                    nanf("no value"), nanf("no value") };
 
-uint16_t update_sensor_cnt           = 0;
-uint16_t update_webserver_cnt        = 0;
-uint16_t update_windspeed_exceed_cnt = 0;
+uint32_t update_sensor_cnt = 0;
+uint32_t update_webserver_cnt = 0;
+uint32_t update_windspeed_exceed_cnt = 0;
+uint32_t wifi_check_interval_counter = 0;
+uint32_t http_call_send_json_data_cnt = 0;
+
+#ifndef DISABLE_WIFIMANAGER
+const String wifiName = "oko-weather-" + DEVICE_NAME;
+
+WiFiManager wifiManager;
+#endif
+
+uint8_t fsm_state = FSM_STATE_1;
+
+uint8_t sensor_cnt = 0;
 
 boolean validData = false;
 
-WiFiManager wifiManager;
+boolean do_not_read_windsensor = false;
+
+uint32_t wifi_reconnect_cnt = 0;
 
 //*************************************************************************//
 
-void debug(String x)
-{
+void debug(String x) {
 #ifdef DEBUG
   Serial.println(x);
 #endif
+
+#ifdef USE_LOGGER
+  logdata(String(millis()) + ":" + x);
+#endif
 }
 
-void setup()
-{
+//*************************************************************************//
+
+void setup() {
 
 #if defined(DEBUG) || defined(SERIAL_FEATURE)
-  Serial.begin(115200);
+  Serial.begin(SERIAL_BAUD_RATE);
 #endif
 
   // Pin settings
-  pinMode(BAT_CHARGED_PIN,        INPUT);
-  pinMode(BAT_CHARGING_PIN,       INPUT);
-  pinMode(STATUS_LED_PIN,        OUTPUT);
-  pinMode(ANEMOMETER_PIN,  INPUT_PULLUP);
-  pinMode(A0,                     INPUT);
+  pinMode(BAT_CHARGED_PIN, INPUT);
+  pinMode(BAT_CHARGING_PIN, INPUT);
+  pinMode(STATUS_LED_PIN, OUTPUT);
+  pinMode(ANEMOMETER_PIN, INPUT_PULLUP);
+  pinMode(A0, INPUT);
 
-  digitalWrite(STATUS_LED_PIN, LOW);
+  digitalWrite(STATUS_LED_PIN, HIGH);
 
 #ifndef BAT_PINS_D34
   debug("D5 D6 used as battery pins");
@@ -73,59 +100,22 @@ void setup()
   criticalBatCheck();
 #endif
 
-  wifiConnectionCheck();
+  wifiConnect();
   debug("Connected!");
 
-#ifdef INFLUXDB_FEATURE
-  influxdb_begin();
-#endif
+  initWifiBasedSW();
 
-  // Initialize and configure the sensors
-#ifdef SENSOR_APDS9930
-  if (sensor_apds9930_begin()) {
-    sensors[SENSOR_LIGHT] = &apds9930_light;
-  }
-#endif
-
-#ifdef SENSOR_APDS9960
-  if (sensor_apds9960_begin()) {
-    sensors[SENSOR_LIGHT] = &apds9960_light;
-  }
-#endif
-
-#ifdef SENSOR_BME280
-  //Temperature + pressure
-  if (sensor_bme280_begin(BME_ADDRESS)) {
-    sensors[SENSOR_TEMPERATURE] = &bme280_temperature;
-    sensors[SENSOR_HUMIDITY] = &bme280_humidity;
-    sensors[SENSOR_PRESSURE] = &bme280_pressure;
-  }
-#endif
-
-#ifdef SENSOR_WIND
-  sensors[SENSOR_WINDSPEED] = &wind_speed;
-#endif
-
-#ifdef SENSOR_BATTERY
-  sensors[SENSOR_BAT_VOLTAGE] = &battery_voltage;
-  sensors[SENSOR_BATCHARGESTATE] = &battery_charging;
-  sensors[SENSOR_ESAVEMODE] = &isEnergySavingMode;
-#endif
-
-#ifdef WEBUPDATER_FEATURE
-#ifndef BATTERY_POWERED
-  setupWebUpdater(DEVICE_NAME, WiFi.localIP().toString());
-#endif
-#endif
+  initSensors();
 
   //It's magic! leave in
   delay(100);
 
 #ifdef BATTERY_POWERED
   debug("battery powered");
-  _loop();
 
-  digitalWrite(STATUS_LED_PIN, LOW);
+  _battery_mode_main();
+
+  digitalWrite(STATUS_LED_PIN, HIGH);
 
   criticalBatCheck();
 
@@ -134,24 +124,176 @@ void setup()
 
   debug("deep sleep");
 
-  // the ESP.deepSleep requires microseconds as input, after the sleep the system will run into the setup routine
+  // the ESP.deepSleep requires microseconds as input, after the
+  // sleep the system will run into the setup routine
   ESP.deepSleep(POWERSAVING_SLEEP_S * 1000000, WAKE_RF_DEFAULT);
   delay(100);
-#endif
+
+#else  // not in battery mode
 
 #ifdef ENABLE_WATCHDOG
   // Enable the internal watchdog
   ESP.wdtEnable(WATCHDOG_TIMEOUT_MS);
 #endif
-
+#endif
 }
 
 //*************************************************************************//
 
-void wifiConnectionCheck()
-{
-  // Establish WiFi connection
-  String wifiName = "oko-weather-" + DEVICE_NAME;
+void initWifiBasedSW() {
+
+#ifdef INFLUXDB_FEATURE
+  influxdb_begin();
+#endif
+
+#ifdef WEBUPDATER_FEATURE
+#ifndef BATTERY_POWERED
+  setupWebUpdater(DEVICE_NAME, WiFi.localIP().toString());
+#endif
+#endif
+}
+
+//*************************************************************************//
+
+void initSensors() {
+  // Initialize and configure the sensors
+#ifdef SENSOR_APDS9930
+  if (sensor_apds9930_begin();
+#endif
+
+#ifdef SENSOR_APDS9960
+  sensor_apds9960_begin();
+#endif
+
+#ifdef SENSOR_BME280
+  //Temperature + pressure + humidity
+  sensor_bme280_begin(BME_ADDRESS);
+#endif
+
+#ifdef SENSOR_BMP280
+  //Temperature + pressure + humidity
+  sensor_bmp280_begin(BMP_ADDRESS);
+#endif
+}
+
+//*************************************************************************//
+
+float readSensors(uint8_t s) {
+  float ret = nan("no value");
+
+  switch (s) {
+    case SENSOR_LIGHT:  // Initialize and configure the sensors
+#ifdef SENSOR_APDS9930
+      ret = apds9930_light();
+#endif
+#ifdef SENSOR_APDS9960
+      ret = apds9960_light();
+#endif
+      break;
+
+    case SENSOR_TEMPERATURE:
+#ifdef SENSOR_BME280
+      ret = bme280_temperature();
+#endif
+#ifdef SENSOR_BMP280
+      ret = bmp280_temperature();
+#endif
+      break;
+
+    case SENSOR_HUMIDITY:
+#ifdef SENSOR_BME280
+      ret = bme280_humidity();
+#endif
+      break;
+
+    case SENSOR_PRESSURE:
+#ifdef SENSOR_BME280
+      ret = bme280_pressure();
+#endif
+#ifdef SENSOR_BMP280
+      ret = bmp280_pressure();
+#endif
+      break;
+
+    case SENSOR_WINDSPEED:
+#ifdef SENSOR_WIND
+      if (do_not_read_windsensor == false) {
+        ret = wind_speed();
+      }
+#endif
+      break;
+
+    case SENSOR_BAT_VOLTAGE:
+#ifdef SENSOR_BATTERY
+      ret = battery_voltage();
+#endif
+      break;
+
+    case SENSOR_ESAVEMODE:
+#ifdef SENSOR_BATTERY
+      ret = battery_charging();
+#endif
+      break;
+
+    case SENSOR_BATCHARGESTATE:
+#ifdef SENSOR_BATTERY
+      ret = isEnergySavingMode();
+#endif
+      break;
+
+    default:
+      break;
+  }
+
+  return ret;
+}
+
+//*************************************************************************//
+
+void wifiConnectionCheck() {
+
+  if ((wifi_check_interval_counter + WIFI_CHECK_INTERVAL_MS) > millis()) {
+    // if check interval is not exceeded abort check
+    return;
+  }
+
+  wifi_check_interval_counter = millis();
+
+  if (WiFi.status() == WL_CONNECTED) {
+    // if we are connected
+    return;
+  }
+
+  wifi_reconnect_cnt++;
+
+  debug("no wifi connection, try to reconnect " + String(wifi_reconnect_cnt));
+
+  WiFi.disconnect();
+  WiFi.mode(WIFI_OFF);
+  WiFi.mode(WIFI_STA);
+
+#ifdef WEBUPDATER_FEATURE
+  setWifiReconnectCnt(wifi_reconnect_cnt);
+#endif
+
+  if (wifi_reconnect_cnt >= 5) {
+    debug("\nReboot");
+    ESP.restart();
+  } else {
+
+    wifiConnect();
+
+    //initWifiBasedSW();
+  }
+}
+
+//*************************************************************************//
+
+void wifiConnect() {
+
+  // Establish WiFi connection if not already applied
+
+#ifndef DISABLE_WIFIMANAGER
 
   wifiManager.setMinimumSignalQuality(WIFI_MINIMUM_SIGNAL_QUALITY);
   // the time in seconds to wait for the known wifi connection
@@ -159,95 +301,297 @@ void wifiConnectionCheck()
   // the time in seconds to wait for the user to configure the device
   wifiManager.setTimeout(WIFI_CONFIG_PORTAL_TIMEOUT_S);
 
-  while (!wifiManager.autoConnect(wifiName.c_str(), "DEADBEEF"))
-  {
-    debug("WiFi connection failed, try again in 5 seconds...");
-    // If autoconnect to WLAN failed and no client connected, go to deep sleep
+  while (!wifiManager.autoConnect(wifiName.c_str(), "DEADBEEF")) {
+
 #ifdef SLEEP_IF_NO_WLAN_CONNECTION
+    // If autoconnect to WLAN failed and no client connected, go to deep sleep
     ESP.deepSleep(POWERSAVING_SLEEP_S * 1000000, WAKE_RF_DEFAULT);
     delay(100);
 #endif
+
 #ifndef SLEEP_IF_NO_WLAN_CONNECTION
     // sleep a few seconds and go on trying to connect
+    debug("WiFi connection failed, try again in 5 seconds...");
     delay(5000);
 #endif
   }
 
+#else  // DISABLE_WIFIMANAGER
+
+  if (!WiFi.config(local_IP, gateway, subnet)) {
+    debug("Failed to set IP configuration");
+  } else {
+    debug("Successful set IP configuration");
+  }
+
+  WiFi.begin(WIFI_SSID, WIFI_PASSWD);
+
+  debug("Connecting to WLAN");
+
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(100);
+  }
+
+#endif  // DISABLE_WIFIMANAGER
 }
 
 //*************************************************************************//
 
 #ifdef BATTERY_POWERED
-void criticalBatCheck()
-{
+void criticalBatCheck() {
   float volt = battery_voltage();
   if (volt <= BAT_EMERGENCY_DEEPSLEEP_VOLTAGE) {
     debug("Bat Voltage: " + String(volt) + " V");
     debug("Low battery, going into deep sleep.");
     // Casting to an unsigned int, so it fits into the integer range
-    ESP.deepSleep(1U * EMERGENCY_SLEEP_S * 1000000); // battery low, shutting down
+    ESP.deepSleep(1U * EMERGENCY_SLEEP_S * 1000000u);  // battery low, shutting down
     delay(100);
   }
 }
 #endif
 
-void loop()
-{
+//*************************************************************************//
+
+void loop() {
 
 #ifdef ENABLE_WATCHDOG
   ESP.wdtFeed();
 #endif
 
-  wifiConnectionCheck();
-
 #ifdef BATTERY_POWERED
   delay(50);
   return;
-#endif
 
-  // call sub loop function
-  _loop();
+#else
+
+  // call fsm loop function
+  _fsm_loop();
 
   // Needed to give WIFI time to function properly
   delay(DELAY_LOOP_MS);
 
-  update_sensor_cnt++;
-
-#ifdef WEBUPDATER_FEATURE
-  update_webserver_cnt++;
 #endif
-
-#ifdef HTTP_CALL_ON_WINDSPEED_EXCEED
-  update_windspeed_exceed_cnt++;
-#endif
-
 }
 
-void _loop()
+//*************************************************************************//
+
+#ifndef BATTERY_POWERED
+void _fsm_loop()
 {
 
 #ifdef WEBUPDATER_FEATURE
-  if (UPDATE_WEBSERVER_INTVERVAL_S * 1000 / DELAY_LOOP_MS <= update_webserver_cnt)
+  if ((update_webserver_cnt + (UPDATE_WEBSERVER_INTVERVAL_MS)) <= millis())
   {
-    update_webserver_cnt = 0;
+    //debug("web updater call");
+    update_webserver_cnt = millis();
     doWebUpdater();
   }
 #endif
 
-#ifdef HTTP_CALL_ON_WINDSPEED_EXCEED
-  if (HTTP_CALL_ON_WINDSPEED_INTERVAL_S * 1000 / DELAY_LOOP_MS <= update_windspeed_exceed_cnt)
+#ifdef HTTP_CALL_SEND_JSON_DATA
+  if ((http_call_send_json_data_cnt + (HTTP_CALL_SEND_JSON_DATA_INTERVAL_S * 1000)) <= millis() and validData == true)
   {
-    debug("Reading wind sensor because of exceed call functionality");
-    if (sensors[SENSOR_WINDSPEED])
-    {
-      // read from windspeed sensorSTATUS_LED_PIN
-      digitalWrite(STATUS_LED_PIN, HIGH);
-      currentSensorData[SENSOR_WINDSPEED] = sensors[SENSOR_WINDSPEED]();
-      digitalWrite(STATUS_LED_PIN, LOW);
+    // send the data to the server
+    debug("Sending weather json data to http webserver");
+    //debug(String(0) + "=" + String(currentSensorData[0]));
+    //debug(String(SENSOR_TEMPERATURE) + "=" + String(currentSensorData[SENSOR_TEMPERATURE]));
+    http_call_send_json_data_cnt = millis();
+    http_call_send_json_data();
+  }
+#endif
 
-      if (currentSensorData[SENSOR_WINDSPEED] >= HTTP_CALL_ON_WINDSPEED_EXCEED_MPS)
-      {
-        digitalWrite(STATUS_LED_PIN, HIGH);
+  switch (fsm_state)
+  {
+
+    /* -------------------------------------------------------------------------------- */
+    case FSM_STATE_1:
+      //debug("wind speed exceeded check if required");
+#ifdef HTTP_CALL_ON_WINDSPEED_EXCEED
+      if ((update_windspeed_exceed_cnt + (HTTP_CALL_ON_WINDSPEED_INTERVAL_S * 1000)) <= millis()) {
+        debug("reading wind sensor exceed");
+
+        // reset the wait timer to get a value every HTTP_CALL_ON_WINDSPEED_INTERVAL_S independently to the runtime of the measurement
+        update_windspeed_exceed_cnt = millis();
+
+        // start measurement of wind speed
+        start_measure_wind();
+
+        fsm_state = FSM_STATE_11;  // wait untile the wind meas time exceeded
+        break;                     // abort case here to prevent read of next sensor in list
+      }
+#endif
+      fsm_state = FSM_STATE_2;
+      break;
+
+    /* -------------------------------------------------------------------------------- */
+    case FSM_STATE_2:
+      //debug("reset time check if required");
+#ifdef RESET_ESP_TIME_INTERVAL
+      // if millis() reached interval restart ESP
+      if (RESET_ESP_TIME_INTERVAL_MS <= millis()) {
+        debug("resetting firmware intentionally");
+        // Push reset button after flashing once or do a manual power cycle to get the functionality working.
+        ESP.restart();
+      }
+#endif
+      fsm_state = FSM_STATE_3;
+      break;
+
+    /* -------------------------------------------------------------------------------- */
+    case FSM_STATE_3:
+      wifiConnectionCheck();
+      fsm_state = FSM_STATE_4;
+      break;
+
+    /* -------------------------------------------------------------------------------- */
+    case FSM_STATE_4:
+      //debug("disable measure of wind speed if required");
+#ifdef defined(BATTERY_POWERED) && defined(SENSOR_WIND)
+      if (energySavingMode() == 1) {
+        // Disable expensive tasks
+        //sensors[SENSOR_WINDSPEED] = 0;
+        //debug("read of wind sensor because of low battery disabled");
+        do_not_read_windsensor = true;
+
+      } else {
+        //sensors[SENSOR_WINDSPEED] = &wind_speed;
+        //debug("read of wind sensor because of high battery enabled");
+        do_not_read_windsensor = false;
+      }
+#endif
+      sensor_cnt = 0;
+      fsm_state = FSM_STATE_5;
+      break;
+
+    /* -------------------------------------------------------------------------------- */
+    case FSM_STATE_5:
+      //debug("read sensor data check");
+      if ((update_sensor_cnt + (UPDATE_SENSOR_INTERVAL_S * 1000)) <= millis() or validData == false) {
+        debug("read sensor data " + String(sensor_cnt));
+
+        if (sensor_cnt != SENSOR_WINDSPEED) {
+          // read data from sensor
+          currentSensorData[sensor_cnt] = readSensors(sensor_cnt);
+          //debug(String(sensor_cnt) + "=" + String(currentSensorData[sensor_cnt]));
+
+        } else {
+
+          start_measure_wind();     // start measurement of wind speed
+          fsm_state = FSM_STATE_9;  // wait untile the wind meas time exceeded
+          break;                    // abort case here to prevent read of next sensor in list
+        }
+
+        if (sensor_cnt < VALUES - 1) {
+          sensor_cnt++;
+          fsm_state = FSM_STATE_5;  // jump to same state again, more sensors to read
+
+        } else {
+
+          update_sensor_cnt = millis();  // reset the update interval counter
+          sensor_cnt = 0;
+          fsm_state = FSM_STATE_6;  // next state
+        }
+
+      } else {
+
+        //debug("skip read sensor data");
+        fsm_state = FSM_STATE_1;  // no new data, reset FSM
+      }
+      break;
+
+    /* -------------------------------------------------------------------------------- */
+    case FSM_STATE_6:
+      //debug("log to serial if required");
+#ifdef SERIAL_FEATURE
+      logToSerial(currentSensorData);
+#endif
+      fsm_state = FSM_STATE_7;
+      break;
+
+    /* -------------------------------------------------------------------------------- */
+    case FSM_STATE_7:
+      //debug("send data to influxdb if required");
+#ifdef INFLUXDB_FEATURE
+      for (uint8_t i = 0; i < 5 and validData == false; i++) {  // only check sensor data 0 to 4 -> SENSOR_TEMPERATURE, SENSOR_HUMIDITY, SENSOR_LIGHT, SENSOR_WINDSPEED, SENSOR_PRESSURE
+        if (currentSensorData[i] != 0 and currentSensorData[i] != nanf("no value") and (not isnan(currentSensorData[i]))) {
+          validData = true;
+        }
+      }
+
+      if (validData == true) {
+        // send data only if valid data is available
+        pushToInfluxDB(DEVICE_NAME, currentSensorData);
+      }
+#endif
+      fsm_state = FSM_STATE_8;
+      break;
+
+    /* -------------------------------------------------------------------------------- */
+    case FSM_STATE_8:
+      //debug("set sensor data in webupdater if required");
+#ifdef WEBUPDATER_FEATURE
+#ifdef SHOW_SENSOR_DATA_ON_WEBUPDATER_MAIN_PAGE
+      setSensorData(currentSensorData);
+#endif
+#endif
+
+      fsm_state = FSM_STATE_1;
+      break;
+
+    /* -------------------------------------------------------------------------------- */
+    case FSM_STATE_9:
+#ifdef SENSOR_WIND
+      if (check_measure_wind_done() == false) {
+        //debug("wait for wind sensor finish");
+        fsm_state = FSM_STATE_9;  // stay here until the wind measurement is done
+      } else {
+        //debug("wind sensor read finish");
+        fsm_state = FSM_STATE_10;
+      }
+#else
+      // in case that the wind sensor is not used skip this step
+      sensor_cnt++;
+      fsm_state = FSM_STATE_5;
+#endif
+      break;
+
+    /* -------------------------------------------------------------------------------- */
+    case FSM_STATE_10:
+#ifdef SENSOR_WIND
+      currentSensorData[SENSOR_WINDSPEED] = measure_wind_result();
+      debug("wind sensor " + String(currentSensorData[SENSOR_WINDSPEED]));
+#endif
+      // step into read of next sensor read
+      sensor_cnt++;
+      fsm_state = FSM_STATE_5;
+      break;
+
+    /* -------------------------------------------------------------------------------- */
+    case FSM_STATE_11:
+#ifdef SENSOR_WIND
+      if (check_measure_wind_done() == false) {
+        //debug("wait for wind sensor finish");
+        fsm_state = FSM_STATE_11;  // stay here until the wind measurement is done
+      } else {
+        //debug("wind sensor read finish");
+        fsm_state = FSM_STATE_12;
+      }
+#else
+      // in case that the wind sensor is not used skip this step
+      sensor_cnt++;
+      fsm_state = FSM_STATE_5;
+#endif
+      break;
+
+    /* -------------------------------------------------------------------------------- */
+    case FSM_STATE_12:
+#ifdef HTTP_CALL_ON_WINDSPEED_EXCEED
+      currentSensorData[SENSOR_WINDSPEED] = measure_wind_result();
+      debug("wind sensor value " + String(currentSensorData[SENSOR_WINDSPEED]));
+
+      if (currentSensorData[SENSOR_WINDSPEED] >= HTTP_CALL_ON_WINDSPEED_EXCEED_MPS) {
+        // windspeed exceeded send http call
+        digitalWrite(STATUS_LED_PIN, LOW);
 
         // call the url HTTP_CALL_ON_WINDSPEED_URL
         WiFiClient client;
@@ -259,90 +603,78 @@ void _loop()
 
         if (httpResponseCode > 0) {
           String response = http.getString();
-#ifdef DEBUG
-          Serial.println("http response code: " + String(httpResponseCode) + " = " + response);
-#endif
+          debug("http response code: " + String(httpResponseCode) + " = " + response);
           // TODO handle response
         }
 
         http.end();
         debug("Called windspeed exceed callout");
-        digitalWrite(STATUS_LED_PIN, LOW);
+        digitalWrite(STATUS_LED_PIN, HIGH);
       }
-    } else {
-      currentSensorData[SENSOR_WINDSPEED] = nan("no value");
-    }
-    update_windspeed_exceed_cnt = 0;
-  }
-#endif
 
-#ifdef RESET_ESP_TIME_INTERVAL
-  // if millis() reached interval restart ESP
-  if (RESET_ESP_TIME_INTERVAL_MS <= millis())
+#ifdef WEBUPDATER_FEATURE
+#ifdef SHOW_SENSOR_DATA_ON_WEBUPDATER_MAIN_PAGE
+      sentWindspeed(currentSensorData[SENSOR_WINDSPEED]);
+#endif // SHOW_SENSOR_DATA_ON_WEBUPDATER_MAIN_PAGE
+#endif // WEBUPDATER_FEATURE
+#endif // HTTP_CALL_ON_WINDSPEED_EXCEED
+
+      // step into read of next fsm state
+      fsm_state = FSM_STATE_2;
+      break;
+
+    /* -------------------------------------------------------------------------------- */
+    default:
+      fsm_state = FSM_STATE_1;
+      break;
+
+  }  // close of switch
+
+  //debug("FSM state = " + String(fsm_state));
+  /*if (fsm_state == FSM_STATE_1)
   {
-    debug("Resetting firmware intentionally");
-    // Push reset button after flashing once or do a manual power cycle to get the functionality working.
-    ESP.restart();
-  }
+    debug("----------");
+  }*/
+}
 #endif
 
-#ifndef BATTERY_POWERED
-  if (UPDATE_SENSOR_INTERVAL_S * 1000 / DELAY_LOOP_MS > update_sensor_cnt)
-  {
-    return;
-  }
-#endif
+//*************************************************************************//
+
+void _battery_mode_main() {
 
-#ifdef defined(BATTERY_POWERED) && defined(SENSOR_WIND)
   if (energySavingMode() == 1) {
     // Disable expensive tasks
-    sensors[SENSOR_WINDSPEED] = 0;
-  } else {
-    sensors[SENSOR_WINDSPEED] = &wind_speed;
-  }
-#endif
+    //debug("read of wind sensor because of low battery disabled");
+    do_not_read_windsensor = true;
 
-  update_sensor_cnt = 0;
-  for (uint8_t i = 0; i < VALUES; i++)
-  {
-    if (sensors[i]) {
-      currentSensorData[i] = sensors[i]();
-    } else {
-      currentSensorData[i] = nan("no value");
-    }
+  } else {
+    //debug("read of wind sensor because of high battery enabled");
+    do_not_read_windsensor = false;
+  }
+
+  for (uint8_t i = 0; i < VALUES; i++) {
+    currentSensorData[i] = readSensors(i);
   }
 
 #ifdef SERIAL_FEATURE
   logToSerial(currentSensorData);
 #endif
 
-  delay(100);
-
 #ifdef INFLUXDB_FEATURE
-
-  for (uint8_t i = 0; i < 5 and validData == false; i++)
-  {
-    if (currentSensorData[i] != 0)
-    {
-      validData = true; // at least one value is not zero, the data
-    }
-  }
-
-  if (validData == true)
-  {
-    // send data only if valid data is available
-    pushToInfluxDB(DEVICE_NAME, currentSensorData);
-  }
+  pushToInfluxDB(DEVICE_NAME, currentSensorData);
 #endif
 
 #ifdef WEBUPDATER_FEATURE
+#ifdef SHOW_SENSOR_DATA_ON_WEBUPDATER_MAIN_PAGE
   setSensorData(currentSensorData);
 #endif
-
+#endif
 }
 
-void logToSerial(float sensorValues[])
-{
+//*************************************************************************//
+
+#ifdef SERIAL_FEATURE
+void logToSerial(float sensorValues[]) {
   Serial.println("");
   Serial.println("Current readings:");
   Serial.println("Temperature: " + String(sensorValues[SENSOR_TEMPERATURE]) + " °C");
@@ -354,3 +686,68 @@ void logToSerial(float sensorValues[])
   Serial.println("Bat charge state: " + String(sensorValues[SENSOR_BATCHARGESTATE]));
   Serial.println("Energy saving: " + String(sensorValues[SENSOR_ESAVEMODE]));
 }
+#endif
+
+//*************************************************************************//
+
+#ifdef HTTP_CALL_SEND_JSON_DATA
+
+String getJsonData()
+{
+  debug(String(SENSOR_TEMPERATURE) + "=" + String(currentSensorData[SENSOR_TEMPERATURE]));
+  String msg = hb_ws_msg_start +
+              hb_ws_msg_temp +
+              String(currentSensorData[SENSOR_TEMPERATURE], 2) +
+              ", " +
+              hb_ws_msg_humi +
+              String((isnan(currentSensorData[SENSOR_HUMIDITY]) ? 0.0 : currentSensorData[SENSOR_HUMIDITY]), 2) +
+              ", " +
+              hb_ws_msg_light +
+              String(currentSensorData[SENSOR_LIGHT], 0) + // The light level for the homebridge-http-lux2 plugin is only able to parse integer values
+              ", " +
+              hb_ws_msg_windspeed +
+              String(currentSensorData[SENSOR_WINDSPEED], 2) +
+              ", " +
+              hb_ws_msg_pressure +
+              String(currentSensorData[SENSOR_PRESSURE], 2) +
+              ", " +
+              hb_ws_msg_timestamp +
+              String(millis()) +
+              ", " +
+              hb_ws_msg_valid +
+              String(validData) +
+              hb_ws_msg_end;
+
+  return msg;
+}
+
+void http_call_send_json_data()
+{
+  //debug("http call to  " + String(HTTP_CALL_SEND_JSON_DATA_URL));
+  //debug(String(SENSOR_TEMPERATURE) + "=" + String(currentSensorData[SENSOR_TEMPERATURE]));
+  // windspeed exceeded send http call
+  digitalWrite(STATUS_LED_PIN, LOW);
+
+  // call the url HTTP_CALL_SEND_JSON_DATA_URL
+  WiFiClient client;
+  HTTPClient http;
+
+  String tmp_str = HTTP_CALL_SEND_JSON_DATA_URL + urlEncode(getJsonData());
+
+  debug("send: " + tmp_str);
+
+  http.begin(client, String(tmp_str).c_str());
+  // Send HTTP GET request
+  int httpResponseCode = http.GET();
+
+  if (httpResponseCode > 0) {
+    String response = http.getString();
+    debug("http response code: " + String(httpResponseCode) + " = " + response);
+    // TODO handle response
+  }
+
+  http.end();
+  digitalWrite(STATUS_LED_PIN, HIGH);
+}
+
+#endif

firmware/influxdb.ino

@@ -1,12 +1,16 @@
 
 #include "config_user.h"
 
+//*************************************************************************//
+
 #if INFLUXDB_VERSION == 1
 
 #include <ESP8266Influxdb.h>     // https://github.com/hwwong/ESP8266Influxdb
 
 Influxdb _influxdb(INFLUXDB_HOST, INFLUXDB_PORT);
 
+const String msg = "weather,device=" + device + " ";
+
 void influxdb_begin() {
   // Init variables to influxdb config - doesn't talk to database
   _influxdb.opendb(INFLUXDB_DB, INFLUXDB_USER, INFLUXDB_PASS);
@@ -16,7 +20,6 @@ void pushToInfluxDB(String device, float sensorValues[]) {
   uint8_t tries = 0;
   boolean addComma = false;
 
-  String msg = "weather,device=" + device + " ";
   if (!(isnan(sensorValues[SENSOR_TEMPERATURE])))
   {
     msg += "temperature=" + String(sensorValues[SENSOR_TEMPERATURE]);
@@ -86,6 +89,8 @@ void pushToInfluxDB(String device, float sensorValues[]) {
   } while (_influxdb.response() != DB_SUCCESS and tries < 5);
 }
 
+//*************************************************************************//
+
 #elif INFLUXDB_VERSION == 2
 
 #include <InfluxDbClient.h> // from bib manager
@@ -172,30 +177,42 @@ void pushToInfluxDB(String device, float sensorValues[]) {
 
 }
 
-void _writePoint() {
+void _writePoint()
+{
 
+  uint32_t _timeout = millis();
+
+  //debug("InfluxDB2: check connection");
+  do {
+  } while (client.validateConnection() and (_timeout + INFLUXDB_TIMEOUT_MS) <= millis());
+
+  if (! client.validateConnection())
+  {
+    debug("Can't write to InfluxDB2, timeout validating connection");
+    return;
+  }
+
+  _timeout = millis();
+
+  //debug("InfluxDB2: waiting for write ready");
   // wait unitl ready
   do {
-#ifdef DEBUG
-    Serial.print("InfluxDB: waiting for write ready\n");
-#endif
-  } while (client.canSendRequest() == false);
+  } while (client.canSendRequest() == false and (_timeout + INFLUXDB_TIMEOUT_MS) <= millis());
+
+  if (! client.canSendRequest())
+  {
+    debug("Can't write to InfluxDB2, timeout canSendRequest");
+    return;
+  }
 
   // Write point
-  if (!client.writePoint(sensor)) {
-#ifdef DEBUG
-    Serial.print("InfluxDB write failed: ");
-    Serial.println(client.getLastErrorMessage());
-    Serial.print("\nErrorcode: ");
-    Serial.println(client.getLastStatusCode());
-    Serial.print("\n");
-#endif
-  } else {
-#ifdef DEBUG
-    Serial.print("InfluxDB write done\n");
-#endif    
+  if (!client.writePoint(sensor))
+  {
+    debug("InfluxDB2 write failed: " + String(client.getLastErrorMessage()) + " Err: " + String(client.getLastStatusCode()));
   }
 
 }
 
 #endif // influxdb version 2 check
+
+//*************************************************************************//

firmware/libraries/Adafruit_BMP280_Library/Adafruit_BMP280.cpp

@@ -0,0 +1,493 @@
+/*!
+ *  @file Adafruit_BMP280.cpp
+ *
+ *  This is a library for the BMP280 orientation sensor
+ *
+ *  Designed specifically to work with the Adafruit BMP280 Sensor.
+ *
+ *  Pick one up today in the adafruit shop!
+ *  ------> https://www.adafruit.com/product/2651
+ *
+ *  These sensors use I2C to communicate, 2 pins are required to interface.
+ *
+ *  Adafruit invests time and resources providing this open source code,
+ *  please support Adafruit andopen-source hardware by purchasing products
+ *  from Adafruit!
+ *
+ *  K.Townsend (Adafruit Industries)
+ *
+ *  BSD license, all text above must be included in any redistribution
+ */
+
+#include <Adafruit_BMP280.h>
+
+/*!
+ * @brief  BMP280 constructor using i2c
+ * @param  *theWire
+ *         optional wire
+ */
+Adafruit_BMP280::Adafruit_BMP280(TwoWire *theWire) {
+  _wire = theWire;
+  temp_sensor = new Adafruit_BMP280_Temp(this);
+  pressure_sensor = new Adafruit_BMP280_Pressure(this);
+}
+
+/*!
+ * @brief  BMP280 constructor using hardware SPI
+ * @param  cspin
+ *         cs pin number
+ * @param  theSPI
+ *         optional SPI object
+ */
+Adafruit_BMP280::Adafruit_BMP280(int8_t cspin, SPIClass *theSPI) {
+  spi_dev = new Adafruit_SPIDevice(cspin, 1000000, SPI_BITORDER_MSBFIRST,
+                                   SPI_MODE0, theSPI);
+  temp_sensor = new Adafruit_BMP280_Temp(this);
+  pressure_sensor = new Adafruit_BMP280_Pressure(this);
+}
+
+/*!
+ * @brief  BMP280 constructor using bitbang SPI
+ * @param  cspin
+ *         The pin to use for CS/SSEL.
+ * @param  mosipin
+ *         The pin to use for MOSI.
+ * @param  misopin
+ *         The pin to use for MISO.
+ * @param  sckpin
+ *         The pin to use for SCK.
+ */
+Adafruit_BMP280::Adafruit_BMP280(int8_t cspin, int8_t mosipin, int8_t misopin,
+                                 int8_t sckpin) {
+  spi_dev = new Adafruit_SPIDevice(cspin, sckpin, misopin, mosipin);
+  temp_sensor = new Adafruit_BMP280_Temp(this);
+  pressure_sensor = new Adafruit_BMP280_Pressure(this);
+}
+
+Adafruit_BMP280::~Adafruit_BMP280(void) {
+  if (spi_dev)
+    delete spi_dev;
+  if (i2c_dev)
+    delete i2c_dev;
+  if (temp_sensor)
+    delete temp_sensor;
+  if (pressure_sensor)
+    delete pressure_sensor;
+}
+
+/*!
+ *  Initialises the sensor.
+ *  @param addr
+ *         The I2C address to use (default = 0x77)
+ *  @param chipid
+ *         The expected chip ID (used to validate connection).
+ *  @return True if the init was successful, otherwise false.
+ */
+bool Adafruit_BMP280::begin(uint8_t addr, uint8_t chipid) {
+  if (spi_dev == NULL) {
+    // I2C mode
+    if (i2c_dev)
+      delete i2c_dev;
+    i2c_dev = new Adafruit_I2CDevice(addr, _wire);
+    if (!i2c_dev->begin())
+      return false;
+  } else {
+    // SPI mode
+    if (!spi_dev->begin())
+      return false;
+  }
+
+  // check if sensor, i.e. the chip ID is correct
+  _sensorID = read8(BMP280_REGISTER_CHIPID);
+  if (_sensorID != chipid)
+    return false;
+
+  readCoefficients();
+  // write8(BMP280_REGISTER_CONTROL, 0x3F); /* needed? */
+  setSampling();
+  delay(100);
+  return true;
+}
+
+/*!
+ * Sets the sampling config for the device.
+ * @param mode
+ *        The operating mode of the sensor.
+ * @param tempSampling
+ *        The sampling scheme for temp readings.
+ * @param pressSampling
+ *        The sampling scheme for pressure readings.
+ * @param filter
+ *        The filtering mode to apply (if any).
+ * @param duration
+ *        The sampling duration.
+ */
+void Adafruit_BMP280::setSampling(sensor_mode mode,
+                                  sensor_sampling tempSampling,
+                                  sensor_sampling pressSampling,
+                                  sensor_filter filter,
+                                  standby_duration duration) {
+  if (!_sensorID)
+    return; // begin() not called yet
+  _measReg.mode = mode;
+  _measReg.osrs_t = tempSampling;
+  _measReg.osrs_p = pressSampling;
+
+  _configReg.filter = filter;
+  _configReg.t_sb = duration;
+
+  write8(BMP280_REGISTER_CONFIG, _configReg.get());
+  write8(BMP280_REGISTER_CONTROL, _measReg.get());
+}
+
+/**************************************************************************/
+/*!
+    @brief  Writes an 8 bit value over I2C/SPI
+*/
+/**************************************************************************/
+void Adafruit_BMP280::write8(byte reg, byte value) {
+  byte buffer[2];
+  buffer[1] = value;
+  if (i2c_dev) {
+    buffer[0] = reg;
+    i2c_dev->write(buffer, 2);
+  } else {
+    buffer[0] = reg & ~0x80;
+    spi_dev->write(buffer, 2);
+  }
+}
+
+/*!
+ *  @brief  Reads an 8 bit value over I2C/SPI
+ *  @param  reg
+ *          selected register
+ *  @return value from selected register
+ */
+uint8_t Adafruit_BMP280::read8(byte reg) {
+  uint8_t buffer[1];
+  if (i2c_dev) {
+    buffer[0] = uint8_t(reg);
+    i2c_dev->write_then_read(buffer, 1, buffer, 1);
+  } else {
+    buffer[0] = uint8_t(reg | 0x80);
+    spi_dev->write_then_read(buffer, 1, buffer, 1);
+  }
+  return buffer[0];
+}
+
+/*!
+ *  @brief  Reads a 16 bit value over I2C/SPI
+ */
+uint16_t Adafruit_BMP280::read16(byte reg) {
+  uint8_t buffer[2];
+
+  if (i2c_dev) {
+    buffer[0] = uint8_t(reg);
+    i2c_dev->write_then_read(buffer, 1, buffer, 2);
+  } else {
+    buffer[0] = uint8_t(reg | 0x80);
+    spi_dev->write_then_read(buffer, 1, buffer, 2);
+  }
+  return uint16_t(buffer[0]) << 8 | uint16_t(buffer[1]);
+}
+
+uint16_t Adafruit_BMP280::read16_LE(byte reg) {
+  uint16_t temp = read16(reg);
+  return (temp >> 8) | (temp << 8);
+}
+
+/*!
+ *   @brief  Reads a signed 16 bit value over I2C/SPI
+ */
+int16_t Adafruit_BMP280::readS16(byte reg) { return (int16_t)read16(reg); }
+
+int16_t Adafruit_BMP280::readS16_LE(byte reg) {
+  return (int16_t)read16_LE(reg);
+}
+
+/*!
+ *  @brief  Reads a 24 bit value over I2C/SPI
+ */
+uint32_t Adafruit_BMP280::read24(byte reg) {
+  uint8_t buffer[3];
+
+  if (i2c_dev) {
+    buffer[0] = uint8_t(reg);
+    i2c_dev->write_then_read(buffer, 1, buffer, 3);
+  } else {
+    buffer[0] = uint8_t(reg | 0x80);
+    spi_dev->write_then_read(buffer, 1, buffer, 3);
+  }
+  return uint32_t(buffer[0]) << 16 | uint32_t(buffer[1]) << 8 |
+         uint32_t(buffer[2]);
+}
+
+/*!
+ *  @brief  Reads the factory-set coefficients
+ */
+void Adafruit_BMP280::readCoefficients() {
+  _bmp280_calib.dig_T1 = read16_LE(BMP280_REGISTER_DIG_T1);
+  _bmp280_calib.dig_T2 = readS16_LE(BMP280_REGISTER_DIG_T2);
+  _bmp280_calib.dig_T3 = readS16_LE(BMP280_REGISTER_DIG_T3);
+
+  _bmp280_calib.dig_P1 = read16_LE(BMP280_REGISTER_DIG_P1);
+  _bmp280_calib.dig_P2 = readS16_LE(BMP280_REGISTER_DIG_P2);
+  _bmp280_calib.dig_P3 = readS16_LE(BMP280_REGISTER_DIG_P3);
+  _bmp280_calib.dig_P4 = readS16_LE(BMP280_REGISTER_DIG_P4);
+  _bmp280_calib.dig_P5 = readS16_LE(BMP280_REGISTER_DIG_P5);
+  _bmp280_calib.dig_P6 = readS16_LE(BMP280_REGISTER_DIG_P6);
+  _bmp280_calib.dig_P7 = readS16_LE(BMP280_REGISTER_DIG_P7);
+  _bmp280_calib.dig_P8 = readS16_LE(BMP280_REGISTER_DIG_P8);
+  _bmp280_calib.dig_P9 = readS16_LE(BMP280_REGISTER_DIG_P9);
+}
+
+/*!
+ * Reads the temperature from the device.
+ * @return The temperature in degrees celsius.
+ */
+float Adafruit_BMP280::readTemperature() {
+  int32_t var1, var2;
+  if (!_sensorID)
+    return NAN; // begin() not called yet
+
+  int32_t adc_T = read24(BMP280_REGISTER_TEMPDATA);
+  adc_T >>= 4;
+
+  var1 = ((((adc_T >> 3) - ((int32_t)_bmp280_calib.dig_T1 << 1))) *
+          ((int32_t)_bmp280_calib.dig_T2)) >>
+         11;
+
+  var2 = (((((adc_T >> 4) - ((int32_t)_bmp280_calib.dig_T1)) *
+            ((adc_T >> 4) - ((int32_t)_bmp280_calib.dig_T1))) >>
+           12) *
+          ((int32_t)_bmp280_calib.dig_T3)) >>
+         14;
+
+  t_fine = var1 + var2;
+
+  float T = (t_fine * 5 + 128) >> 8;
+  return T / 100;
+}
+
+/*!
+ * Reads the barometric pressure from the device.
+ * @return Barometric pressure in Pa.
+ */
+float Adafruit_BMP280::readPressure() {
+  int64_t var1, var2, p;
+  if (!_sensorID)
+    return NAN; // begin() not called yet
+
+  // Must be done first to get the t_fine variable set up
+  readTemperature();
+
+  int32_t adc_P = read24(BMP280_REGISTER_PRESSUREDATA);
+  adc_P >>= 4;
+
+  var1 = ((int64_t)t_fine) - 128000;
+  var2 = var1 * var1 * (int64_t)_bmp280_calib.dig_P6;
+  var2 = var2 + ((var1 * (int64_t)_bmp280_calib.dig_P5) << 17);
+  var2 = var2 + (((int64_t)_bmp280_calib.dig_P4) << 35);
+  var1 = ((var1 * var1 * (int64_t)_bmp280_calib.dig_P3) >> 8) +
+         ((var1 * (int64_t)_bmp280_calib.dig_P2) << 12);
+  var1 =
+      (((((int64_t)1) << 47) + var1)) * ((int64_t)_bmp280_calib.dig_P1) >> 33;
+
+  if (var1 == 0) {
+    return 0; // avoid exception caused by division by zero
+  }
+  p = 1048576 - adc_P;
+  p = (((p << 31) - var2) * 3125) / var1;
+  var1 = (((int64_t)_bmp280_calib.dig_P9) * (p >> 13) * (p >> 13)) >> 25;
+  var2 = (((int64_t)_bmp280_calib.dig_P8) * p) >> 19;
+
+  p = ((p + var1 + var2) >> 8) + (((int64_t)_bmp280_calib.dig_P7) << 4);
+  return (float)p / 256;
+}
+
+/*!
+ * @brief Calculates the approximate altitude using barometric pressure and the
+ * supplied sea level hPa as a reference.
+ * @param seaLevelhPa
+ *        The current hPa at sea level.
+ * @return The approximate altitude above sea level in meters.
+ */
+float Adafruit_BMP280::readAltitude(float seaLevelhPa) {
+  float altitude;
+
+  float pressure = readPressure(); // in Si units for Pascal
+  pressure /= 100;
+
+  altitude = 44330 * (1.0 - pow(pressure / seaLevelhPa, 0.1903));
+
+  return altitude;
+}
+
+/*!
+ * Calculates the pressure at sea level (QNH) from the specified altitude,
+ * and atmospheric pressure (QFE).
+ * @param  altitude      Altitude in m
+ * @param  atmospheric   Atmospheric pressure in hPa
+ * @return The approximate pressure in hPa
+ */
+float Adafruit_BMP280::seaLevelForAltitude(float altitude, float atmospheric) {
+  // Equation taken from BMP180 datasheet (page 17):
+  // http://www.adafruit.com/datasheets/BST-BMP180-DS000-09.pdf
+
+  // Note that using the equation from wikipedia can give bad results
+  // at high altitude.  See this thread for more information:
+  // http://forums.adafruit.com/viewtopic.php?f=22&t=58064
+  return atmospheric / pow(1.0 - (altitude / 44330.0), 5.255);
+}
+
+/*!
+    @brief  calculates the boiling point  of water by a given pressure
+    @param pressure pressure in hPa
+    @return temperature in °C
+*/
+
+float Adafruit_BMP280::waterBoilingPoint(float pressure) {
+  // Magnusformular for calculation of the boiling point of water at a given
+  // pressure
+  return (234.175 * log(pressure / 6.1078)) /
+         (17.08085 - log(pressure / 6.1078));
+}
+
+/*!
+    @brief  Take a new measurement (only possible in forced mode)
+    @return true if successful, otherwise false
+ */
+bool Adafruit_BMP280::takeForcedMeasurement() {
+  // If we are in forced mode, the BME sensor goes back to sleep after each
+  // measurement and we need to set it to forced mode once at this point, so
+  // it will take the next measurement and then return to sleep again.
+  // In normal mode simply does new measurements periodically.
+  if (_measReg.mode == MODE_FORCED) {
+    // set to forced mode, i.e. "take next measurement"
+    write8(BMP280_REGISTER_CONTROL, _measReg.get());
+    // wait until measurement has been completed, otherwise we would read
+    // the values from the last measurement
+    while (read8(BMP280_REGISTER_STATUS) & 0x08)
+      delay(1);
+    return true;
+  }
+  return false;
+}
+
+/*!
+ *  @brief  Resets the chip via soft reset
+ */
+void Adafruit_BMP280::reset(void) {
+  write8(BMP280_REGISTER_SOFTRESET, MODE_SOFT_RESET_CODE);
+}
+
+/*!
+ *   Returns Sensor ID for diagnostics
+ *   @returns 0x61 for BME680, 0x60 for BME280, 0x56, 0x57, 0x58 for BMP280
+ */
+uint8_t Adafruit_BMP280::sensorID(void) { return _sensorID; };
+
+/*!
+    @brief  Gets the most recent sensor event from the hardware status register.
+    @return Sensor status as a byte.
+ */
+uint8_t Adafruit_BMP280::getStatus(void) {
+  return read8(BMP280_REGISTER_STATUS);
+}
+
+/*!
+    @brief  Gets an Adafruit Unified Sensor object for the temp sensor component
+    @return Adafruit_Sensor pointer to temperature sensor
+ */
+Adafruit_Sensor *Adafruit_BMP280::getTemperatureSensor(void) {
+  return temp_sensor;
+}
+
+/*!
+    @brief  Gets an Adafruit Unified Sensor object for the pressure sensor
+   component
+    @return Adafruit_Sensor pointer to pressure sensor
+ */
+Adafruit_Sensor *Adafruit_BMP280::getPressureSensor(void) {
+  return pressure_sensor;
+}
+
+/**************************************************************************/
+/*!
+    @brief  Gets the sensor_t data for the BMP280's temperature sensor
+*/
+/**************************************************************************/
+void Adafruit_BMP280_Temp::getSensor(sensor_t *sensor) {
+  /* Clear the sensor_t object */
+  memset(sensor, 0, sizeof(sensor_t));
+
+  /* Insert the sensor name in the fixed length char array */
+  strncpy(sensor->name, "BMP280", sizeof(sensor->name) - 1);
+  sensor->name[sizeof(sensor->name) - 1] = 0;
+  sensor->version = 1;
+  sensor->sensor_id = _sensorID;
+  sensor->type = SENSOR_TYPE_AMBIENT_TEMPERATURE;
+  sensor->min_delay = 0;
+  sensor->min_value = -40.0; /* Temperature range -40 ~ +85 C  */
+  sensor->max_value = +85.0;
+  sensor->resolution = 0.01; /*  0.01 C */
+}
+
+/**************************************************************************/
+/*!
+    @brief  Gets the temperature as a standard sensor event
+    @param  event Sensor event object that will be populated
+    @returns True
+*/
+/**************************************************************************/
+bool Adafruit_BMP280_Temp::getEvent(sensors_event_t *event) {
+  /* Clear the event */
+  memset(event, 0, sizeof(sensors_event_t));
+
+  event->version = sizeof(sensors_event_t);
+  event->sensor_id = _sensorID;
+  event->type = SENSOR_TYPE_AMBIENT_TEMPERATURE;
+  event->timestamp = millis();
+  event->temperature = _theBMP280->readTemperature();
+  return true;
+}
+
+/**************************************************************************/
+/*!
+    @brief  Gets the sensor_t data for the BMP280's pressure sensor
+*/
+/**************************************************************************/
+void Adafruit_BMP280_Pressure::getSensor(sensor_t *sensor) {
+  /* Clear the sensor_t object */
+  memset(sensor, 0, sizeof(sensor_t));
+
+  /* Insert the sensor name in the fixed length char array */
+  strncpy(sensor->name, "BMP280", sizeof(sensor->name) - 1);
+  sensor->name[sizeof(sensor->name) - 1] = 0;
+  sensor->version = 1;
+  sensor->sensor_id = _sensorID;
+  sensor->type = SENSOR_TYPE_PRESSURE;
+  sensor->min_delay = 0;
+  sensor->min_value = 300.0; /* 300 ~ 1100 hPa  */
+  sensor->max_value = 1100.0;
+  sensor->resolution = 0.012; /* 0.12 hPa relative */
+}
+
+/**************************************************************************/
+/*!
+    @brief  Gets the pressure as a standard sensor event
+    @param  event Sensor event object that will be populated
+    @returns True
+*/
+/**************************************************************************/
+bool Adafruit_BMP280_Pressure::getEvent(sensors_event_t *event) {
+  /* Clear the event */
+  memset(event, 0, sizeof(sensors_event_t));
+
+  event->version = sizeof(sensors_event_t);
+  event->sensor_id = _sensorID;
+  event->type = SENSOR_TYPE_PRESSURE;
+  event->timestamp = millis();
+  event->pressure = _theBMP280->readPressure() / 100; // convert Pa to hPa
+  return true;
+}

firmware/libraries/Adafruit_BMP280_Library/Adafruit_BMP280.h

@@ -0,0 +1,267 @@
+/*!
+ *  @file Adafruit_BMP280.h
+ *
+ *  This is a library for the Adafruit BMP280 Breakout.
+ *
+ *  Designed specifically to work with the Adafruit BMP280 Breakout.
+ *
+ *  Pick one up today in the adafruit shop!
+ *  ------> https://www.adafruit.com/product/2651
+ *
+ *  These sensors use I2C to communicate, 2 pins are required to interface.
+ *
+ *  Adafruit invests time and resources providing this open source code,
+ *  please support Adafruit andopen-source hardware by purchasing products
+ *  from Adafruit!
+ *
+ *  K.Townsend (Adafruit Industries)
+ *
+ *  BSD license, all text above must be included in any redistribution
+ */
+#ifndef __BMP280_H__
+#define __BMP280_H__
+
+// clang-format off
+#include <Arduino.h>
+#include <Adafruit_Sensor.h>
+#include <Adafruit_I2CDevice.h>
+#include <Adafruit_SPIDevice.h>
+// clang-format on
+
+/*!
+ *  I2C ADDRESS/BITS/SETTINGS
+ */
+#define BMP280_ADDRESS (0x77) /**< The default I2C address for the sensor. */
+#define BMP280_ADDRESS_ALT                                                     \
+  (0x76)                     /**< Alternative I2C address for the sensor. */
+#define BMP280_CHIPID (0x58) /**< Default chip ID. */
+
+/*!
+ * Registers available on the sensor.
+ */
+enum {
+  BMP280_REGISTER_DIG_T1 = 0x88,
+  BMP280_REGISTER_DIG_T2 = 0x8A,
+  BMP280_REGISTER_DIG_T3 = 0x8C,
+  BMP280_REGISTER_DIG_P1 = 0x8E,
+  BMP280_REGISTER_DIG_P2 = 0x90,
+  BMP280_REGISTER_DIG_P3 = 0x92,
+  BMP280_REGISTER_DIG_P4 = 0x94,
+  BMP280_REGISTER_DIG_P5 = 0x96,
+  BMP280_REGISTER_DIG_P6 = 0x98,
+  BMP280_REGISTER_DIG_P7 = 0x9A,
+  BMP280_REGISTER_DIG_P8 = 0x9C,
+  BMP280_REGISTER_DIG_P9 = 0x9E,
+  BMP280_REGISTER_CHIPID = 0xD0,
+  BMP280_REGISTER_VERSION = 0xD1,
+  BMP280_REGISTER_SOFTRESET = 0xE0,
+  BMP280_REGISTER_CAL26 = 0xE1, /**< R calibration = 0xE1-0xF0 */
+  BMP280_REGISTER_STATUS = 0xF3,
+  BMP280_REGISTER_CONTROL = 0xF4,
+  BMP280_REGISTER_CONFIG = 0xF5,
+  BMP280_REGISTER_PRESSUREDATA = 0xF7,
+  BMP280_REGISTER_TEMPDATA = 0xFA,
+};
+
+/*!
+ *  Struct to hold calibration data.
+ */
+typedef struct {
+  uint16_t dig_T1; /**< dig_T1 cal register. */
+  int16_t dig_T2;  /**<  dig_T2 cal register. */
+  int16_t dig_T3;  /**< dig_T3 cal register. */
+
+  uint16_t dig_P1; /**< dig_P1 cal register. */
+  int16_t dig_P2;  /**< dig_P2 cal register. */
+  int16_t dig_P3;  /**< dig_P3 cal register. */
+  int16_t dig_P4;  /**< dig_P4 cal register. */
+  int16_t dig_P5;  /**< dig_P5 cal register. */
+  int16_t dig_P6;  /**< dig_P6 cal register. */
+  int16_t dig_P7;  /**< dig_P7 cal register. */
+  int16_t dig_P8;  /**< dig_P8 cal register. */
+  int16_t dig_P9;  /**< dig_P9 cal register. */
+} bmp280_calib_data;
+
+class Adafruit_BMP280;
+
+/** Adafruit Unified Sensor interface for temperature component of BMP280 */
+class Adafruit_BMP280_Temp : public Adafruit_Sensor {
+public:
+  /** @brief Create an Adafruit_Sensor compatible object for the temp sensor
+      @param parent A pointer to the BMP280 class */
+  Adafruit_BMP280_Temp(Adafruit_BMP280 *parent) { _theBMP280 = parent; }
+  bool getEvent(sensors_event_t *);
+  void getSensor(sensor_t *);
+
+private:
+  int _sensorID = 280;
+  Adafruit_BMP280 *_theBMP280 = NULL;
+};
+
+/** Adafruit Unified Sensor interface for pressure component of BMP280 */
+class Adafruit_BMP280_Pressure : public Adafruit_Sensor {
+public:
+  /** @brief Create an Adafruit_Sensor compatible object for the pressure sensor
+      @param parent A pointer to the BMP280 class */
+  Adafruit_BMP280_Pressure(Adafruit_BMP280 *parent) { _theBMP280 = parent; }
+  bool getEvent(sensors_event_t *);
+  void getSensor(sensor_t *);
+
+private:
+  int _sensorID = 0;
+  Adafruit_BMP280 *_theBMP280 = NULL;
+};
+
+/**
+ * Driver for the Adafruit BMP280 barometric pressure sensor.
+ */
+class Adafruit_BMP280 {
+public:
+  /** Oversampling rate for the sensor. */
+  enum sensor_sampling {
+    /** No over-sampling. */
+    SAMPLING_NONE = 0x00,
+    /** 1x over-sampling. */
+    SAMPLING_X1 = 0x01,
+    /** 2x over-sampling. */
+    SAMPLING_X2 = 0x02,
+    /** 4x over-sampling. */
+    SAMPLING_X4 = 0x03,
+    /** 8x over-sampling. */
+    SAMPLING_X8 = 0x04,
+    /** 16x over-sampling. */
+    SAMPLING_X16 = 0x05
+  };
+
+  /** Operating mode for the sensor. */
+  enum sensor_mode {
+    /** Sleep mode. */
+    MODE_SLEEP = 0x00,
+    /** Forced mode. */
+    MODE_FORCED = 0x01,
+    /** Normal mode. */
+    MODE_NORMAL = 0x03,
+    /** Software reset. */
+    MODE_SOFT_RESET_CODE = 0xB6
+  };
+
+  /** Filtering level for sensor data. */
+  enum sensor_filter {
+    /** No filtering. */
+    FILTER_OFF = 0x00,
+    /** 2x filtering. */
+    FILTER_X2 = 0x01,
+    /** 4x filtering. */
+    FILTER_X4 = 0x02,
+    /** 8x filtering. */
+    FILTER_X8 = 0x03,
+    /** 16x filtering. */
+    FILTER_X16 = 0x04
+  };
+
+  /** Standby duration in ms */
+  enum standby_duration {
+    /** 1 ms standby. */
+    STANDBY_MS_1 = 0x00,
+    /** 62.5 ms standby. */
+    STANDBY_MS_63 = 0x01,
+    /** 125 ms standby. */
+    STANDBY_MS_125 = 0x02,
+    /** 250 ms standby. */
+    STANDBY_MS_250 = 0x03,
+    /** 500 ms standby. */
+    STANDBY_MS_500 = 0x04,
+    /** 1000 ms standby. */
+    STANDBY_MS_1000 = 0x05,
+    /** 2000 ms standby. */
+    STANDBY_MS_2000 = 0x06,
+    /** 4000 ms standby. */
+    STANDBY_MS_4000 = 0x07
+  };
+
+  Adafruit_BMP280(TwoWire *theWire = &Wire);
+  Adafruit_BMP280(int8_t cspin, SPIClass *theSPI = &SPI);
+  Adafruit_BMP280(int8_t cspin, int8_t mosipin, int8_t misopin, int8_t sckpin);
+  ~Adafruit_BMP280(void);
+
+  bool begin(uint8_t addr = BMP280_ADDRESS, uint8_t chipid = BMP280_CHIPID);
+  void reset(void);
+  uint8_t getStatus(void);
+  uint8_t sensorID(void);
+
+  float readTemperature();
+  float readPressure(void);
+  float readAltitude(float seaLevelhPa = 1013.25);
+  float seaLevelForAltitude(float altitude, float atmospheric);
+  float waterBoilingPoint(float pressure);
+  bool takeForcedMeasurement();
+
+  Adafruit_Sensor *getTemperatureSensor(void);
+  Adafruit_Sensor *getPressureSensor(void);
+
+  void setSampling(sensor_mode mode = MODE_NORMAL,
+                   sensor_sampling tempSampling = SAMPLING_X16,
+                   sensor_sampling pressSampling = SAMPLING_X16,
+                   sensor_filter filter = FILTER_OFF,
+                   standby_duration duration = STANDBY_MS_1);
+
+private:
+  TwoWire *_wire;                     /**< Wire object */
+  Adafruit_I2CDevice *i2c_dev = NULL; ///< Pointer to I2C bus interface
+  Adafruit_SPIDevice *spi_dev = NULL; ///< Pointer to SPI bus interface
+
+  Adafruit_BMP280_Temp *temp_sensor = NULL;
+  Adafruit_BMP280_Pressure *pressure_sensor = NULL;
+
+  /** Encapsulates the config register */
+  struct config {
+    /** Initialize to power-on-reset state */
+    config() : t_sb(STANDBY_MS_1), filter(FILTER_OFF), none(0), spi3w_en(0) {}
+    /** Inactive duration (standby time) in normal mode */
+    unsigned int t_sb : 3;
+    /** Filter settings */
+    unsigned int filter : 3;
+    /** Unused - don't set */
+    unsigned int none : 1;
+    /** Enables 3-wire SPI */
+    unsigned int spi3w_en : 1;
+    /** Used to retrieve the assembled config register's byte value. */
+    unsigned int get() { return (t_sb << 5) | (filter << 2) | spi3w_en; }
+  };
+
+  /** Encapsulates trhe ctrl_meas register */
+  struct ctrl_meas {
+    /** Initialize to power-on-reset state */
+    ctrl_meas()
+        : osrs_t(SAMPLING_NONE), osrs_p(SAMPLING_NONE), mode(MODE_SLEEP) {}
+    /** Temperature oversampling. */
+    unsigned int osrs_t : 3;
+    /** Pressure oversampling. */
+    unsigned int osrs_p : 3;
+    /** Device mode */
+    unsigned int mode : 2;
+    /** Used to retrieve the assembled ctrl_meas register's byte value. */
+    unsigned int get() { return (osrs_t << 5) | (osrs_p << 2) | mode; }
+  };
+
+  void readCoefficients(void);
+  uint8_t spixfer(uint8_t x);
+  void write8(byte reg, byte value);
+  uint8_t read8(byte reg);
+  uint16_t read16(byte reg);
+  uint32_t read24(byte reg);
+  int16_t readS16(byte reg);
+  uint16_t read16_LE(byte reg);
+  int16_t readS16_LE(byte reg);
+
+  uint8_t _i2caddr;
+
+  int32_t _sensorID = 0;
+  int32_t t_fine;
+  // int8_t _cs, _mosi, _miso, _sck;
+  bmp280_calib_data _bmp280_calib;
+  config _configReg;
+  ctrl_meas _measReg;
+};
+
+#endif

firmware/libraries/Adafruit_BMP280_Library/README.md

@@ -0,0 +1,47 @@
+# Adafruit BMP280 Driver (Barometric Pressure Sensor) [![Build Status](https://travis-ci.com/adafruit/Adafruit_BMP280_Library.svg?branch=master)](https://travis-ci.com/adafruit/Adafruit_BMP280_Library)
+
+This driver is for the [Adafruit BMP280 Breakout](http://www.adafruit.com/products/2651)
+
+<a href="https://www.adafruit.com/product/2651"><img src="assets/board.jpg" width="500"/></a>
+
+## About the BMP280 ##
+
+This precision sensor from Bosch is the best low-cost sensing solution for measuring barometric pressure and temperature. Because pressure changes with altitude you can also use it as an altimeter!
+
+## About this Driver ##
+
+Adafruit invests time and resources providing this open source code.  Please support Adafruit and open-source hardware by purchasing products from Adafruit!
+
+Written by Kevin (KTOWN) Townsend for Adafruit Industries.
+
+<!-- START COMPATIBILITY TABLE -->
+
+## Compatibility
+
+MCU                | Tested Works | Doesn't Work | Not Tested  | Notes
+------------------ | :----------: | :----------: | :---------: | -----
+Atmega328 @ 16MHz  |      X       |             |            |
+Atmega328 @ 12MHz  |      X       |             |            |
+Atmega32u4 @ 16MHz |      X       |             |            | Use SDA/SCL on pins D2 &amp; D3
+Atmega32u4 @ 8MHz  |      X       |             |            | Use SDA/SCL on pins D2 &amp; D3
+ESP8266            |      X       |             |            | SDA/SCL default to pins 4 &amp; 5 but any two pins can be assigned as SDA/SCL using Wire.begin(SDA,SCL)
+Atmega2560 @ 16MHz |      X       |             |            | Use SDA/SCL on pins 20 &amp; 21
+ATSAM3X8E          |      X       |             |            | Use SDA/SCL on pins 20 &amp; 21
+ATSAM21D           |      X       |             |            |
+ATtiny85 @ 16MHz   |             |      X       |            |
+ATtiny85 @ 8MHz    |             |      X       |            |
+Intel Curie @ 32MHz |             |             |     X       |
+STM32F2            |             |             |     X       |
+
+  * ATmega328 @ 16MHz : Arduino UNO, Adafruit Pro Trinket 5V, Adafruit Metro 328, Adafruit Metro Mini
+  * ATmega328 @ 12MHz : Adafruit Pro Trinket 3V
+  * ATmega32u4 @ 16MHz : Arduino Leonardo, Arduino Micro, Arduino Yun, Teensy 2.0
+  * ATmega32u4 @ 8MHz : Adafruit Flora, Bluefruit Micro
+  * ESP8266 : Adafruit Huzzah
+  * ATmega2560 @ 16MHz : Arduino Mega
+  * ATSAM3X8E : Arduino Due
+  * ATSAM21D : Arduino Zero, M0 Pro
+  * ATtiny85 @ 16MHz : Adafruit Trinket 5V
+  * ATtiny85 @ 8MHz : Adafruit Gemma, Arduino Gemma, Adafruit Trinket 3V
+
+<!-- END COMPATIBILITY TABLE -->

firmware/libraries/Adafruit_BMP280_Library/examples/bmp280_forced/bmp280_forced.ino

@@ -0,0 +1,72 @@
+/***************************************************************************
+  This is a library for the BMP280 humidity, temperature & pressure sensor
+
+  Designed specifically to work with the Adafruit BMP280 Breakout
+  ----> http://www.adafruit.com/products/2651
+
+  These sensors use I2C or SPI to communicate, 2 or 4 pins are required
+  to interface.
+
+  Adafruit invests time and resources providing this open source code,
+  please support Adafruit andopen-source hardware by purchasing products
+  from Adafruit!
+
+  Written by Limor Fried & Kevin Townsend for Adafruit Industries.
+  BSD license, all text above must be included in any redistribution
+ ***************************************************************************/
+
+#include <Adafruit_BMP280.h>
+
+#define BMP_SCK  (13)
+#define BMP_MISO (12)
+#define BMP_MOSI (11)
+#define BMP_CS   (10)
+
+Adafruit_BMP280 bmp; // I2C
+//Adafruit_BMP280 bmp(BMP_CS); // hardware SPI
+//Adafruit_BMP280 bmp(BMP_CS, BMP_MOSI, BMP_MISO,  BMP_SCK);
+
+void setup() {
+  Serial.begin(9600);
+  Serial.println(F("BMP280 Forced Mode Test."));
+
+  //if (!bmp.begin(BMP280_ADDRESS_ALT, BMP280_CHIPID)) {
+  if (!bmp.begin()) {
+    Serial.println(F("Could not find a valid BMP280 sensor, check wiring or "
+                      "try a different address!"));
+    while (1) delay(10);
+  }
+
+  /* Default settings from datasheet. */
+  bmp.setSampling(Adafruit_BMP280::MODE_FORCED,     /* Operating Mode. */
+                  Adafruit_BMP280::SAMPLING_X2,     /* Temp. oversampling */
+                  Adafruit_BMP280::SAMPLING_X16,    /* Pressure oversampling */
+                  Adafruit_BMP280::FILTER_X16,      /* Filtering. */
+                  Adafruit_BMP280::STANDBY_MS_500); /* Standby time. */
+}
+
+void loop() {
+  // must call this to wake sensor up and get new measurement data
+  // it blocks until measurement is complete
+  if (bmp.takeForcedMeasurement()) {
+    // can now print out the new measurements
+    Serial.print(F("Temperature = "));
+    Serial.print(bmp.readTemperature());
+    Serial.println(" *C");
+
+    Serial.print(F("Pressure = "));
+    Serial.print(bmp.readPressure());
+    Serial.println(" Pa");
+
+    Serial.print(F("Approx altitude = "));
+    Serial.print(bmp.readAltitude(1013.25)); /* Adjusted to local forecast! */
+    Serial.println(" m");
+
+    Serial.println();
+    delay(2000);
+  } else {
+    Serial.println("Forced measurement failed!");
+  }
+
+
+}

firmware/libraries/Adafruit_BMP280_Library/examples/bmp280_sensortest/bmp280_sensortest.ino

@@ -0,0 +1,71 @@
+/***************************************************************************
+  This is a library for the BMP280 humidity, temperature & pressure sensor
+  This example shows how to take Sensor Events instead of direct readings
+  
+  Designed specifically to work with the Adafruit BMP280 Breakout
+  ----> http://www.adafruit.com/products/2651
+
+  These sensors use I2C or SPI to communicate, 2 or 4 pins are required
+  to interface.
+
+  Adafruit invests time and resources providing this open source code,
+  please support Adafruit and open-source hardware by purchasing products
+  from Adafruit!
+
+  Written by Limor Fried & Kevin Townsend for Adafruit Industries.
+  BSD license, all text above must be included in any redistribution
+ ***************************************************************************/
+
+#include <Wire.h>
+#include <SPI.h>
+#include <Adafruit_BMP280.h>
+
+Adafruit_BMP280 bmp; // use I2C interface
+Adafruit_Sensor *bmp_temp = bmp.getTemperatureSensor();
+Adafruit_Sensor *bmp_pressure = bmp.getPressureSensor();
+
+void setup() {
+  Serial.begin(9600);
+  while ( !Serial ) delay(100);   // wait for native usb
+  Serial.println(F("BMP280 Sensor event test"));
+
+  unsigned status;
+  //status = bmp.begin(BMP280_ADDRESS_ALT, BMP280_CHIPID);
+  status = bmp.begin();
+  if (!status) {
+    Serial.println(F("Could not find a valid BMP280 sensor, check wiring or "
+                      "try a different address!"));
+    Serial.print("SensorID was: 0x"); Serial.println(bmp.sensorID(),16);
+    Serial.print("        ID of 0xFF probably means a bad address, a BMP 180 or BMP 085\n");
+    Serial.print("   ID of 0x56-0x58 represents a BMP 280,\n");
+    Serial.print("        ID of 0x60 represents a BME 280.\n");
+    Serial.print("        ID of 0x61 represents a BME 680.\n");
+    while (1) delay(10);
+  }
+
+  /* Default settings from datasheet. */
+  bmp.setSampling(Adafruit_BMP280::MODE_NORMAL,     /* Operating Mode. */
+                  Adafruit_BMP280::SAMPLING_X2,     /* Temp. oversampling */
+                  Adafruit_BMP280::SAMPLING_X16,    /* Pressure oversampling */
+                  Adafruit_BMP280::FILTER_X16,      /* Filtering. */
+                  Adafruit_BMP280::STANDBY_MS_500); /* Standby time. */
+
+  bmp_temp->printSensorDetails();
+}
+
+void loop() {
+  sensors_event_t temp_event, pressure_event;
+  bmp_temp->getEvent(&temp_event);
+  bmp_pressure->getEvent(&pressure_event);
+  
+  Serial.print(F("Temperature = "));
+  Serial.print(temp_event.temperature);
+  Serial.println(" *C");
+
+  Serial.print(F("Pressure = "));
+  Serial.print(pressure_event.pressure);
+  Serial.println(" hPa");
+
+  Serial.println();
+  delay(2000);
+}

firmware/libraries/Adafruit_BMP280_Library/examples/bmp280test/bmp280test.ino

@@ -0,0 +1,72 @@
+/***************************************************************************
+  This is a library for the BMP280 humidity, temperature & pressure sensor
+
+  Designed specifically to work with the Adafruit BMP280 Breakout
+  ----> http://www.adafruit.com/products/2651
+
+  These sensors use I2C or SPI to communicate, 2 or 4 pins are required
+  to interface.
+
+  Adafruit invests time and resources providing this open source code,
+  please support Adafruit andopen-source hardware by purchasing products
+  from Adafruit!
+
+  Written by Limor Fried & Kevin Townsend for Adafruit Industries.
+  BSD license, all text above must be included in any redistribution
+ ***************************************************************************/
+
+#include <Wire.h>
+#include <SPI.h>
+#include <Adafruit_BMP280.h>
+
+#define BMP_SCK  (13)
+#define BMP_MISO (12)
+#define BMP_MOSI (11)
+#define BMP_CS   (10)
+
+Adafruit_BMP280 bmp; // I2C
+//Adafruit_BMP280 bmp(BMP_CS); // hardware SPI
+//Adafruit_BMP280 bmp(BMP_CS, BMP_MOSI, BMP_MISO,  BMP_SCK);
+
+void setup() {
+  Serial.begin(9600);
+  while ( !Serial ) delay(100);   // wait for native usb
+  Serial.println(F("BMP280 test"));
+  unsigned status;
+  //status = bmp.begin(BMP280_ADDRESS_ALT, BMP280_CHIPID);
+  status = bmp.begin();
+  if (!status) {
+    Serial.println(F("Could not find a valid BMP280 sensor, check wiring or "
+                      "try a different address!"));
+    Serial.print("SensorID was: 0x"); Serial.println(bmp.sensorID(),16);
+    Serial.print("        ID of 0xFF probably means a bad address, a BMP 180 or BMP 085\n");
+    Serial.print("   ID of 0x56-0x58 represents a BMP 280,\n");
+    Serial.print("        ID of 0x60 represents a BME 280.\n");
+    Serial.print("        ID of 0x61 represents a BME 680.\n");
+    while (1) delay(10);
+  }
+
+  /* Default settings from datasheet. */
+  bmp.setSampling(Adafruit_BMP280::MODE_NORMAL,     /* Operating Mode. */
+                  Adafruit_BMP280::SAMPLING_X2,     /* Temp. oversampling */
+                  Adafruit_BMP280::SAMPLING_X16,    /* Pressure oversampling */
+                  Adafruit_BMP280::FILTER_X16,      /* Filtering. */
+                  Adafruit_BMP280::STANDBY_MS_500); /* Standby time. */
+}
+
+void loop() {
+    Serial.print(F("Temperature = "));
+    Serial.print(bmp.readTemperature());
+    Serial.println(" *C");
+
+    Serial.print(F("Pressure = "));
+    Serial.print(bmp.readPressure());
+    Serial.println(" Pa");
+
+    Serial.print(F("Approx altitude = "));
+    Serial.print(bmp.readAltitude(1013.25)); /* Adjusted to local forecast! */
+    Serial.println(" m");
+
+    Serial.println();
+    delay(2000);
+}

firmware/libraries/Adafruit_BMP280_Library/keywords.txt

@@ -0,0 +1,57 @@
+#######################################
+# Syntax Coloring Map for BMP280 library
+#######################################
+
+#######################################
+# Datatypes (KEYWORD1)
+#######################################
+Adafruit_BMP280	KEYWORD1
+Adafruit_BMP280_Temp	KEYWORD1
+Adafruit_BMP280_Pressure	KEYWORD1
+bmp280_calib_data	KEYWORD1
+
+#######################################
+# Methods and Functions (KEYWORD2)
+#######################################
+begin	KEYWORD2
+reset	KEYWORD2
+getStatus	KEYWORD2
+sensorID	KEYWORD2
+getEvent	KEYWORD2
+getSensor	KEYWORD2
+readTemperature	KEYWORD2
+readPressure	KEYWORD2
+readAltitude	KEYWORD2
+seaLevelForAltitude	KEYWORD2
+waterBoilingPoint	KEYWORD2
+takeForcedMeasurement	KEYWORD2
+getTemperatureSensor	KEYWORD2
+getPressureSensor	KEYWORD2
+setSampling	KEYWORD2
+
+#######################################
+# Constants (LITERAL1)
+#######################################
+SAMPLING_NONE	LITERAL1
+SAMPLING_X1	LITERAL1
+SAMPLING_X2	LITERAL1
+SAMPLING_X4	LITERAL1
+SAMPLING_X8	LITERAL1
+SAMPLING_X16	LITERAL1
+MODE_SLEEP	LITERAL1
+MODE_FORCED	LITERAL1
+MODE_NORMAL	LITERAL1
+MODE_SOFT_RESET_CODE	LITERAL1
+FILTER_OFF	LITERAL1
+FILTER_X2	LITERAL1
+FILTER_X4	LITERAL1
+FILTER_X8	LITERAL1
+FILTER_X16	LITERAL1
+STANDBY_MS_1	LITERAL1
+STANDBY_MS_63	LITERAL1
+STANDBY_MS_125	LITERAL1
+STANDBY_MS_250	LITERAL1
+STANDBY_MS_500	LITERAL1
+STANDBY_MS_1000	LITERAL1
+STANDBY_MS_2000	LITERAL1
+STANDBY_MS_4000	LITERAL1

firmware/libraries/Adafruit_BMP280_Library/library.properties

@@ -0,0 +1,10 @@
+name=Adafruit BMP280 Library
+version=2.6.6
+author=Adafruit
+maintainer=Adafruit <info@adafruit.com>
+sentence=Arduino library for BMP280 sensors.
+paragraph=Arduino library for BMP280 pressure and altitude sensors.
+category=Sensors
+url=https://github.com/adafruit/Adafruit_BMP280_Library
+architectures=*
+depends=Adafruit Unified Sensor, Adafruit BusIO

firmware/libraries/Adafruit_BusIO/Adafruit_BusIO_Register.cpp

@@ -0,0 +1,365 @@
+#include <Adafruit_BusIO_Register.h>
+
+#if !defined(SPI_INTERFACES_COUNT) ||                                          \
+    (defined(SPI_INTERFACES_COUNT) && (SPI_INTERFACES_COUNT > 0))
+
+/*!
+ *    @brief  Create a register we access over an I2C Device (which defines the
+ * bus and address)
+ *    @param  i2cdevice The I2CDevice to use for underlying I2C access
+ *    @param  reg_addr The address pointer value for the I2C/SMBus register, can
+ * be 8 or 16 bits
+ *    @param  width    The width of the register data itself, defaults to 1 byte
+ *    @param  byteorder The byte order of the register (used when width is > 1),
+ * defaults to LSBFIRST
+ *    @param  address_width The width of the register address itself, defaults
+ * to 1 byte
+ */
+Adafruit_BusIO_Register::Adafruit_BusIO_Register(Adafruit_I2CDevice *i2cdevice,
+                                                 uint16_t reg_addr,
+                                                 uint8_t width,
+                                                 uint8_t byteorder,
+                                                 uint8_t address_width) {
+  _i2cdevice = i2cdevice;
+  _spidevice = nullptr;
+  _addrwidth = address_width;
+  _address = reg_addr;
+  _byteorder = byteorder;
+  _width = width;
+}
+
+/*!
+ *    @brief  Create a register we access over an SPI Device (which defines the
+ * bus and CS pin)
+ *    @param  spidevice The SPIDevice to use for underlying SPI access
+ *    @param  reg_addr The address pointer value for the SPI register, can
+ * be 8 or 16 bits
+ *    @param  type     The method we use to read/write data to SPI (which is not
+ * as well defined as I2C)
+ *    @param  width    The width of the register data itself, defaults to 1 byte
+ *    @param  byteorder The byte order of the register (used when width is > 1),
+ * defaults to LSBFIRST
+ *    @param  address_width The width of the register address itself, defaults
+ * to 1 byte
+ */
+Adafruit_BusIO_Register::Adafruit_BusIO_Register(Adafruit_SPIDevice *spidevice,
+                                                 uint16_t reg_addr,
+                                                 Adafruit_BusIO_SPIRegType type,
+                                                 uint8_t width,
+                                                 uint8_t byteorder,
+                                                 uint8_t address_width) {
+  _spidevice = spidevice;
+  _spiregtype = type;
+  _i2cdevice = nullptr;
+  _addrwidth = address_width;
+  _address = reg_addr;
+  _byteorder = byteorder;
+  _width = width;
+}
+
+/*!
+ *    @brief  Create a register we access over an I2C or SPI Device. This is a
+ * handy function because we can pass in nullptr for the unused interface,
+ * allowing libraries to mass-define all the registers
+ *    @param  i2cdevice The I2CDevice to use for underlying I2C access, if
+ * nullptr we use SPI
+ *    @param  spidevice The SPIDevice to use for underlying SPI access, if
+ * nullptr we use I2C
+ *    @param  reg_addr The address pointer value for the I2C/SMBus/SPI register,
+ * can be 8 or 16 bits
+ *    @param  type     The method we use to read/write data to SPI (which is not
+ * as well defined as I2C)
+ *    @param  width    The width of the register data itself, defaults to 1 byte
+ *    @param  byteorder The byte order of the register (used when width is > 1),
+ * defaults to LSBFIRST
+ *    @param  address_width The width of the register address itself, defaults
+ * to 1 byte
+ */
+Adafruit_BusIO_Register::Adafruit_BusIO_Register(
+    Adafruit_I2CDevice *i2cdevice, Adafruit_SPIDevice *spidevice,
+    Adafruit_BusIO_SPIRegType type, uint16_t reg_addr, uint8_t width,
+    uint8_t byteorder, uint8_t address_width) {
+  _spidevice = spidevice;
+  _i2cdevice = i2cdevice;
+  _spiregtype = type;
+  _addrwidth = address_width;
+  _address = reg_addr;
+  _byteorder = byteorder;
+  _width = width;
+}
+
+/*!
+ *    @brief  Write a buffer of data to the register location
+ *    @param  buffer Pointer to data to write
+ *    @param  len Number of bytes to write
+ *    @return True on successful write (only really useful for I2C as SPI is
+ * uncheckable)
+ */
+bool Adafruit_BusIO_Register::write(uint8_t *buffer, uint8_t len) {
+
+  uint8_t addrbuffer[2] = {(uint8_t)(_address & 0xFF),
+                           (uint8_t)(_address >> 8)};
+
+  if (_i2cdevice) {
+    return _i2cdevice->write(buffer, len, true, addrbuffer, _addrwidth);
+  }
+  if (_spidevice) {
+    if (_spiregtype == ADDRESSED_OPCODE_BIT0_LOW_TO_WRITE) {
+      // very special case!
+
+      // pass the special opcode address which we set as the high byte of the
+      // regaddr
+      addrbuffer[0] =
+          (uint8_t)(_address >> 8) & ~0x01; // set bottom bit low to write
+      // the 'actual' reg addr is the second byte then
+      addrbuffer[1] = (uint8_t)(_address & 0xFF);
+      // the address appears to be a byte longer
+      return _spidevice->write(buffer, len, addrbuffer, _addrwidth + 1);
+    }
+
+    if (_spiregtype == ADDRBIT8_HIGH_TOREAD) {
+      addrbuffer[0] &= ~0x80;
+    }
+    if (_spiregtype == ADDRBIT8_HIGH_TOWRITE) {
+      addrbuffer[0] |= 0x80;
+    }
+    if (_spiregtype == AD8_HIGH_TOREAD_AD7_HIGH_TOINC) {
+      addrbuffer[0] &= ~0x80;
+      addrbuffer[0] |= 0x40;
+    }
+    return _spidevice->write(buffer, len, addrbuffer, _addrwidth);
+  }
+  return false;
+}
+
+/*!
+ *    @brief  Write up to 4 bytes of data to the register location
+ *    @param  value Data to write
+ *    @param  numbytes How many bytes from 'value' to write
+ *    @return True on successful write (only really useful for I2C as SPI is
+ * uncheckable)
+ */
+bool Adafruit_BusIO_Register::write(uint32_t value, uint8_t numbytes) {
+  if (numbytes == 0) {
+    numbytes = _width;
+  }
+  if (numbytes > 4) {
+    return false;
+  }
+
+  // store a copy
+  _cached = value;
+
+  for (int i = 0; i < numbytes; i++) {
+    if (_byteorder == LSBFIRST) {
+      _buffer[i] = value & 0xFF;
+    } else {
+      _buffer[numbytes - i - 1] = value & 0xFF;
+    }
+    value >>= 8;
+  }
+  return write(_buffer, numbytes);
+}
+
+/*!
+ *    @brief  Read data from the register location. This does not do any error
+ * checking!
+ *    @return Returns 0xFFFFFFFF on failure, value otherwise
+ */
+uint32_t Adafruit_BusIO_Register::read(void) {
+  if (!read(_buffer, _width)) {
+    return -1;
+  }
+
+  uint32_t value = 0;
+
+  for (int i = 0; i < _width; i++) {
+    value <<= 8;
+    if (_byteorder == LSBFIRST) {
+      value |= _buffer[_width - i - 1];
+    } else {
+      value |= _buffer[i];
+    }
+  }
+
+  return value;
+}
+
+/*!
+ *    @brief  Read cached data from last time we wrote to this register
+ *    @return Returns 0xFFFFFFFF on failure, value otherwise
+ */
+uint32_t Adafruit_BusIO_Register::readCached(void) { return _cached; }
+
+/*!
+ *    @brief  Read a buffer of data from the register location
+ *    @param  buffer Pointer to data to read into
+ *    @param  len Number of bytes to read
+ *    @return True on successful write (only really useful for I2C as SPI is
+ * uncheckable)
+ */
+bool Adafruit_BusIO_Register::read(uint8_t *buffer, uint8_t len) {
+  uint8_t addrbuffer[2] = {(uint8_t)(_address & 0xFF),
+                           (uint8_t)(_address >> 8)};
+
+  if (_i2cdevice) {
+    return _i2cdevice->write_then_read(addrbuffer, _addrwidth, buffer, len);
+  }
+  if (_spidevice) {
+    if (_spiregtype == ADDRESSED_OPCODE_BIT0_LOW_TO_WRITE) {
+      // very special case!
+
+      // pass the special opcode address which we set as the high byte of the
+      // regaddr
+      addrbuffer[0] =
+          (uint8_t)(_address >> 8) | 0x01; // set bottom bit high to read
+      // the 'actual' reg addr is the second byte then
+      addrbuffer[1] = (uint8_t)(_address & 0xFF);
+      // the address appears to be a byte longer
+      return _spidevice->write_then_read(addrbuffer, _addrwidth + 1, buffer,
+                                         len);
+    }
+    if (_spiregtype == ADDRBIT8_HIGH_TOREAD) {
+      addrbuffer[0] |= 0x80;
+    }
+    if (_spiregtype == ADDRBIT8_HIGH_TOWRITE) {
+      addrbuffer[0] &= ~0x80;
+    }
+    if (_spiregtype == AD8_HIGH_TOREAD_AD7_HIGH_TOINC) {
+      addrbuffer[0] |= 0x80 | 0x40;
+    }
+    return _spidevice->write_then_read(addrbuffer, _addrwidth, buffer, len);
+  }
+  return false;
+}
+
+/*!
+ *    @brief  Read 2 bytes of data from the register location
+ *    @param  value Pointer to uint16_t variable to read into
+ *    @return True on successful write (only really useful for I2C as SPI is
+ * uncheckable)
+ */
+bool Adafruit_BusIO_Register::read(uint16_t *value) {
+  if (!read(_buffer, 2)) {
+    return false;
+  }
+
+  if (_byteorder == LSBFIRST) {
+    *value = _buffer[1];
+    *value <<= 8;
+    *value |= _buffer[0];
+  } else {
+    *value = _buffer[0];
+    *value <<= 8;
+    *value |= _buffer[1];
+  }
+  return true;
+}
+
+/*!
+ *    @brief  Read 1 byte of data from the register location
+ *    @param  value Pointer to uint8_t variable to read into
+ *    @return True on successful write (only really useful for I2C as SPI is
+ * uncheckable)
+ */
+bool Adafruit_BusIO_Register::read(uint8_t *value) {
+  if (!read(_buffer, 1)) {
+    return false;
+  }
+
+  *value = _buffer[0];
+  return true;
+}
+
+/*!
+ *    @brief  Pretty printer for this register
+ *    @param  s The Stream to print to, defaults to &Serial
+ */
+void Adafruit_BusIO_Register::print(Stream *s) {
+  uint32_t val = read();
+  s->print("0x");
+  s->print(val, HEX);
+}
+
+/*!
+ *    @brief  Pretty printer for this register
+ *    @param  s The Stream to print to, defaults to &Serial
+ */
+void Adafruit_BusIO_Register::println(Stream *s) {
+  print(s);
+  s->println();
+}
+
+/*!
+ *    @brief  Create a slice of the register that we can address without
+ * touching other bits
+ *    @param  reg The Adafruit_BusIO_Register which defines the bus/register
+ *    @param  bits The number of bits wide we are slicing
+ *    @param  shift The number of bits that our bit-slice is shifted from LSB
+ */
+Adafruit_BusIO_RegisterBits::Adafruit_BusIO_RegisterBits(
+    Adafruit_BusIO_Register *reg, uint8_t bits, uint8_t shift) {
+  _register = reg;
+  _bits = bits;
+  _shift = shift;
+}
+
+/*!
+ *    @brief  Read 4 bytes of data from the register
+ *    @return  data The 4 bytes to read
+ */
+uint32_t Adafruit_BusIO_RegisterBits::read(void) {
+  uint32_t val = _register->read();
+  val >>= _shift;
+  return val & ((1 << (_bits)) - 1);
+}
+
+/*!
+ *    @brief  Write 4 bytes of data to the register
+ *    @param  data The 4 bytes to write
+ *    @return True on successful write (only really useful for I2C as SPI is
+ * uncheckable)
+ */
+bool Adafruit_BusIO_RegisterBits::write(uint32_t data) {
+  uint32_t val = _register->read();
+
+  // mask off the data before writing
+  uint32_t mask = (1 << (_bits)) - 1;
+  data &= mask;
+
+  mask <<= _shift;
+  val &= ~mask;          // remove the current data at that spot
+  val |= data << _shift; // and add in the new data
+
+  return _register->write(val, _register->width());
+}
+
+/*!
+ *    @brief  The width of the register data, helpful for doing calculations
+ *    @returns The data width used when initializing the register
+ */
+uint8_t Adafruit_BusIO_Register::width(void) { return _width; }
+
+/*!
+ *    @brief  Set the default width of data
+ *    @param width the default width of data read from register
+ */
+void Adafruit_BusIO_Register::setWidth(uint8_t width) { _width = width; }
+
+/*!
+ *    @brief  Set register address
+ *    @param address the address from register
+ */
+void Adafruit_BusIO_Register::setAddress(uint16_t address) {
+  _address = address;
+}
+
+/*!
+ *    @brief  Set the width of register address
+ *    @param address_width the width for register address
+ */
+void Adafruit_BusIO_Register::setAddressWidth(uint16_t address_width) {
+  _addrwidth = address_width;
+}
+
+#endif // SPI exists

firmware/libraries/Adafruit_BusIO/Adafruit_BusIO_Register.h

@@ -0,0 +1,105 @@
+#ifndef Adafruit_BusIO_Register_h
+#define Adafruit_BusIO_Register_h
+
+#include <Arduino.h>
+
+#if !defined(SPI_INTERFACES_COUNT) ||                                          \
+    (defined(SPI_INTERFACES_COUNT) && (SPI_INTERFACES_COUNT > 0))
+
+#include <Adafruit_I2CDevice.h>
+#include <Adafruit_SPIDevice.h>
+
+typedef enum _Adafruit_BusIO_SPIRegType {
+  ADDRBIT8_HIGH_TOREAD = 0,
+  /*!<
+   * ADDRBIT8_HIGH_TOREAD
+   * When reading a register you must actually send the value 0x80 + register
+   * address to the device. e.g. To read the register 0x0B the register value
+   * 0x8B is sent and to write 0x0B is sent.
+   */
+  AD8_HIGH_TOREAD_AD7_HIGH_TOINC = 1,
+
+  /*!<
+   * ADDRBIT8_HIGH_TOWRITE
+   * When writing to a register you must actually send the value 0x80 +
+   * the register address to the device. e.g. To write to the register 0x19 the
+   * register value 0x99 is sent and to read 0x19 is sent.
+   */
+  ADDRBIT8_HIGH_TOWRITE = 2,
+
+  /*!<
+   * ADDRESSED_OPCODE_LOWBIT_TO_WRITE
+   * Used by the MCP23S series, we send 0x40 |'rd with the opcode
+   * Then set the lowest bit to write
+   */
+  ADDRESSED_OPCODE_BIT0_LOW_TO_WRITE = 3,
+
+} Adafruit_BusIO_SPIRegType;
+
+/*!
+ * @brief The class which defines a device register (a location to read/write
+ * data from)
+ */
+class Adafruit_BusIO_Register {
+public:
+  Adafruit_BusIO_Register(Adafruit_I2CDevice *i2cdevice, uint16_t reg_addr,
+                          uint8_t width = 1, uint8_t byteorder = LSBFIRST,
+                          uint8_t address_width = 1);
+
+  Adafruit_BusIO_Register(Adafruit_SPIDevice *spidevice, uint16_t reg_addr,
+                          Adafruit_BusIO_SPIRegType type, uint8_t width = 1,
+                          uint8_t byteorder = LSBFIRST,
+                          uint8_t address_width = 1);
+
+  Adafruit_BusIO_Register(Adafruit_I2CDevice *i2cdevice,
+                          Adafruit_SPIDevice *spidevice,
+                          Adafruit_BusIO_SPIRegType type, uint16_t reg_addr,
+                          uint8_t width = 1, uint8_t byteorder = LSBFIRST,
+                          uint8_t address_width = 1);
+
+  bool read(uint8_t *buffer, uint8_t len);
+  bool read(uint8_t *value);
+  bool read(uint16_t *value);
+  uint32_t read(void);
+  uint32_t readCached(void);
+  bool write(uint8_t *buffer, uint8_t len);
+  bool write(uint32_t value, uint8_t numbytes = 0);
+
+  uint8_t width(void);
+
+  void setWidth(uint8_t width);
+  void setAddress(uint16_t address);
+  void setAddressWidth(uint16_t address_width);
+
+  void print(Stream *s = &Serial);
+  void println(Stream *s = &Serial);
+
+private:
+  Adafruit_I2CDevice *_i2cdevice;
+  Adafruit_SPIDevice *_spidevice;
+  Adafruit_BusIO_SPIRegType _spiregtype;
+  uint16_t _address;
+  uint8_t _width, _addrwidth, _byteorder;
+  uint8_t _buffer[4]; // we won't support anything larger than uint32 for
+                      // non-buffered read
+  uint32_t _cached = 0;
+};
+
+/*!
+ * @brief The class which defines a slice of bits from within a device register
+ * (a location to read/write data from)
+ */
+class Adafruit_BusIO_RegisterBits {
+public:
+  Adafruit_BusIO_RegisterBits(Adafruit_BusIO_Register *reg, uint8_t bits,
+                              uint8_t shift);
+  bool write(uint32_t value);
+  uint32_t read(void);
+
+private:
+  Adafruit_BusIO_Register *_register;
+  uint8_t _bits, _shift;
+};
+
+#endif // SPI exists
+#endif // BusIO_Register_h

firmware/libraries/Adafruit_BusIO/Adafruit_I2CDevice.cpp

@@ -0,0 +1,313 @@
+#include "Adafruit_I2CDevice.h"
+
+//#define DEBUG_SERIAL Serial
+
+/*!
+ *    @brief  Create an I2C device at a given address
+ *    @param  addr The 7-bit I2C address for the device
+ *    @param  theWire The I2C bus to use, defaults to &Wire
+ */
+Adafruit_I2CDevice::Adafruit_I2CDevice(uint8_t addr, TwoWire *theWire) {
+  _addr = addr;
+  _wire = theWire;
+  _begun = false;
+#ifdef ARDUINO_ARCH_SAMD
+  _maxBufferSize = 250; // as defined in Wire.h's RingBuffer
+#elif defined(ESP32)
+  _maxBufferSize = I2C_BUFFER_LENGTH;
+#else
+  _maxBufferSize = 32;
+#endif
+}
+
+/*!
+ *    @brief  Initializes and does basic address detection
+ *    @param  addr_detect Whether we should attempt to detect the I2C address
+ * with a scan. 99% of sensors/devices don't mind but once in a while, they spaz
+ * on a scan!
+ *    @return True if I2C initialized and a device with the addr found
+ */
+bool Adafruit_I2CDevice::begin(bool addr_detect) {
+  _wire->begin();
+  _begun = true;
+
+  if (addr_detect) {
+    return detected();
+  }
+  return true;
+}
+
+/*!
+ *    @brief  De-initialize device, turn off the Wire interface
+ */
+void Adafruit_I2CDevice::end(void) {
+  // Not all port implement Wire::end(), such as
+  // - ESP8266
+  // - AVR core without WIRE_HAS_END
+  // - ESP32: end() is implemented since 2.0.1 which is latest at the moment.
+  // Temporarily disable for now to give time for user to update.
+#if !(defined(ESP8266) ||                                                      \
+      (defined(ARDUINO_ARCH_AVR) && !defined(WIRE_HAS_END)) ||                 \
+      defined(ARDUINO_ARCH_ESP32))
+  _wire->end();
+  _begun = false;
+#endif
+}
+
+/*!
+ *    @brief  Scans I2C for the address - note will give a false-positive
+ *    if there's no pullups on I2C
+ *    @return True if I2C initialized and a device with the addr found
+ */
+bool Adafruit_I2CDevice::detected(void) {
+  // Init I2C if not done yet
+  if (!_begun && !begin()) {
+    return false;
+  }
+
+  // A basic scanner, see if it ACK's
+  _wire->beginTransmission(_addr);
+  if (_wire->endTransmission() == 0) {
+#ifdef DEBUG_SERIAL
+    DEBUG_SERIAL.println(F("Detected"));
+#endif
+    return true;
+  }
+#ifdef DEBUG_SERIAL
+  DEBUG_SERIAL.println(F("Not detected"));
+#endif
+  return false;
+}
+
+/*!
+ *    @brief  Write a buffer or two to the I2C device. Cannot be more than
+ * maxBufferSize() bytes.
+ *    @param  buffer Pointer to buffer of data to write. This is const to
+ *            ensure the content of this buffer doesn't change.
+ *    @param  len Number of bytes from buffer to write
+ *    @param  prefix_buffer Pointer to optional array of data to write before
+ * buffer. Cannot be more than maxBufferSize() bytes. This is const to
+ *            ensure the content of this buffer doesn't change.
+ *    @param  prefix_len Number of bytes from prefix buffer to write
+ *    @param  stop Whether to send an I2C STOP signal on write
+ *    @return True if write was successful, otherwise false.
+ */
+bool Adafruit_I2CDevice::write(const uint8_t *buffer, size_t len, bool stop,
+                               const uint8_t *prefix_buffer,
+                               size_t prefix_len) {
+  if ((len + prefix_len) > maxBufferSize()) {
+    // currently not guaranteed to work if more than 32 bytes!
+    // we will need to find out if some platforms have larger
+    // I2C buffer sizes :/
+#ifdef DEBUG_SERIAL
+    DEBUG_SERIAL.println(F("\tI2CDevice could not write such a large buffer"));
+#endif
+    return false;
+  }
+
+  _wire->beginTransmission(_addr);
+
+  // Write the prefix data (usually an address)
+  if ((prefix_len != 0) && (prefix_buffer != nullptr)) {
+    if (_wire->write(prefix_buffer, prefix_len) != prefix_len) {
+#ifdef DEBUG_SERIAL
+      DEBUG_SERIAL.println(F("\tI2CDevice failed to write"));
+#endif
+      return false;
+    }
+  }
+
+  // Write the data itself
+  if (_wire->write(buffer, len) != len) {
+#ifdef DEBUG_SERIAL
+    DEBUG_SERIAL.println(F("\tI2CDevice failed to write"));
+#endif
+    return false;
+  }
+
+#ifdef DEBUG_SERIAL
+
+  DEBUG_SERIAL.print(F("\tI2CWRITE @ 0x"));
+  DEBUG_SERIAL.print(_addr, HEX);
+  DEBUG_SERIAL.print(F(" :: "));
+  if ((prefix_len != 0) && (prefix_buffer != nullptr)) {
+    for (uint16_t i = 0; i < prefix_len; i++) {
+      DEBUG_SERIAL.print(F("0x"));
+      DEBUG_SERIAL.print(prefix_buffer[i], HEX);
+      DEBUG_SERIAL.print(F(", "));
+    }
+  }
+  for (uint16_t i = 0; i < len; i++) {
+    DEBUG_SERIAL.print(F("0x"));
+    DEBUG_SERIAL.print(buffer[i], HEX);
+    DEBUG_SERIAL.print(F(", "));
+    if (i % 32 == 31) {
+      DEBUG_SERIAL.println();
+    }
+  }
+
+  if (stop) {
+    DEBUG_SERIAL.print("\tSTOP");
+  }
+#endif
+
+  if (_wire->endTransmission(stop) == 0) {
+#ifdef DEBUG_SERIAL
+    DEBUG_SERIAL.println();
+    // DEBUG_SERIAL.println("Sent!");
+#endif
+    return true;
+  } else {
+#ifdef DEBUG_SERIAL
+    DEBUG_SERIAL.println("\tFailed to send!");
+#endif
+    return false;
+  }
+}
+
+/*!
+ *    @brief  Read from I2C into a buffer from the I2C device.
+ *    Cannot be more than maxBufferSize() bytes.
+ *    @param  buffer Pointer to buffer of data to read into
+ *    @param  len Number of bytes from buffer to read.
+ *    @param  stop Whether to send an I2C STOP signal on read
+ *    @return True if read was successful, otherwise false.
+ */
+bool Adafruit_I2CDevice::read(uint8_t *buffer, size_t len, bool stop) {
+  size_t pos = 0;
+  while (pos < len) {
+    size_t read_len =
+        ((len - pos) > maxBufferSize()) ? maxBufferSize() : (len - pos);
+    bool read_stop = (pos < (len - read_len)) ? false : stop;
+    if (!_read(buffer + pos, read_len, read_stop))
+      return false;
+    pos += read_len;
+  }
+  return true;
+}
+
+bool Adafruit_I2CDevice::_read(uint8_t *buffer, size_t len, bool stop) {
+#if defined(TinyWireM_h)
+  size_t recv = _wire->requestFrom((uint8_t)_addr, (uint8_t)len);
+#elif defined(ARDUINO_ARCH_MEGAAVR)
+  size_t recv = _wire->requestFrom(_addr, len, stop);
+#else
+  size_t recv = _wire->requestFrom((uint8_t)_addr, (uint8_t)len, (uint8_t)stop);
+#endif
+
+  if (recv != len) {
+    // Not enough data available to fulfill our obligation!
+#ifdef DEBUG_SERIAL
+    DEBUG_SERIAL.print(F("\tI2CDevice did not receive enough data: "));
+    DEBUG_SERIAL.println(recv);
+#endif
+    return false;
+  }
+
+  for (uint16_t i = 0; i < len; i++) {
+    buffer[i] = _wire->read();
+  }
+
+#ifdef DEBUG_SERIAL
+  DEBUG_SERIAL.print(F("\tI2CREAD  @ 0x"));
+  DEBUG_SERIAL.print(_addr, HEX);
+  DEBUG_SERIAL.print(F(" :: "));
+  for (uint16_t i = 0; i < len; i++) {
+    DEBUG_SERIAL.print(F("0x"));
+    DEBUG_SERIAL.print(buffer[i], HEX);
+    DEBUG_SERIAL.print(F(", "));
+    if (len % 32 == 31) {
+      DEBUG_SERIAL.println();
+    }
+  }
+  DEBUG_SERIAL.println();
+#endif
+
+  return true;
+}
+
+/*!
+ *    @brief  Write some data, then read some data from I2C into another buffer.
+ *    Cannot be more than maxBufferSize() bytes. The buffers can point to
+ *    same/overlapping locations.
+ *    @param  write_buffer Pointer to buffer of data to write from
+ *    @param  write_len Number of bytes from buffer to write.
+ *    @param  read_buffer Pointer to buffer of data to read into.
+ *    @param  read_len Number of bytes from buffer to read.
+ *    @param  stop Whether to send an I2C STOP signal between the write and read
+ *    @return True if write & read was successful, otherwise false.
+ */
+bool Adafruit_I2CDevice::write_then_read(const uint8_t *write_buffer,
+                                         size_t write_len, uint8_t *read_buffer,
+                                         size_t read_len, bool stop) {
+  if (!write(write_buffer, write_len, stop)) {
+    return false;
+  }
+
+  return read(read_buffer, read_len);
+}
+
+/*!
+ *    @brief  Returns the 7-bit address of this device
+ *    @return The 7-bit address of this device
+ */
+uint8_t Adafruit_I2CDevice::address(void) { return _addr; }
+
+/*!
+ *    @brief  Change the I2C clock speed to desired (relies on
+ *    underlying Wire support!
+ *    @param desiredclk The desired I2C SCL frequency
+ *    @return True if this platform supports changing I2C speed.
+ *    Not necessarily that the speed was achieved!
+ */
+bool Adafruit_I2CDevice::setSpeed(uint32_t desiredclk) {
+#if defined(__AVR_ATmega328__) ||                                              \
+    defined(__AVR_ATmega328P__) // fix arduino core set clock
+  // calculate TWBR correctly
+
+  if ((F_CPU / 18) < desiredclk) {
+#ifdef DEBUG_SERIAL
+    Serial.println(F("I2C.setSpeed too high."));
+#endif
+    return false;
+  }
+  uint32_t atwbr = ((F_CPU / desiredclk) - 16) / 2;
+  if (atwbr > 16320) {
+#ifdef DEBUG_SERIAL
+    Serial.println(F("I2C.setSpeed too low."));
+#endif
+    return false;
+  }
+
+  if (atwbr <= 255) {
+    atwbr /= 1;
+    TWSR = 0x0;
+  } else if (atwbr <= 1020) {
+    atwbr /= 4;
+    TWSR = 0x1;
+  } else if (atwbr <= 4080) {
+    atwbr /= 16;
+    TWSR = 0x2;
+  } else { //  if (atwbr <= 16320)
+    atwbr /= 64;
+    TWSR = 0x3;
+  }
+  TWBR = atwbr;
+
+#ifdef DEBUG_SERIAL
+  Serial.print(F("TWSR prescaler = "));
+  Serial.println(pow(4, TWSR));
+  Serial.print(F("TWBR = "));
+  Serial.println(atwbr);
+#endif
+  return true;
+#elif (ARDUINO >= 157) && !defined(ARDUINO_STM32_FEATHER) &&                   \
+    !defined(TinyWireM_h)
+  _wire->setClock(desiredclk);
+  return true;
+
+#else
+  (void)desiredclk;
+  return false;
+#endif
+}

firmware/libraries/Adafruit_BusIO/Adafruit_I2CDevice.h

@@ -0,0 +1,36 @@
+#ifndef Adafruit_I2CDevice_h
+#define Adafruit_I2CDevice_h
+
+#include <Arduino.h>
+#include <Wire.h>
+
+///< The class which defines how we will talk to this device over I2C
+class Adafruit_I2CDevice {
+public:
+  Adafruit_I2CDevice(uint8_t addr, TwoWire *theWire = &Wire);
+  uint8_t address(void);
+  bool begin(bool addr_detect = true);
+  void end(void);
+  bool detected(void);
+
+  bool read(uint8_t *buffer, size_t len, bool stop = true);
+  bool write(const uint8_t *buffer, size_t len, bool stop = true,
+             const uint8_t *prefix_buffer = nullptr, size_t prefix_len = 0);
+  bool write_then_read(const uint8_t *write_buffer, size_t write_len,
+                       uint8_t *read_buffer, size_t read_len,
+                       bool stop = false);
+  bool setSpeed(uint32_t desiredclk);
+
+  /*!   @brief  How many bytes we can read in a transaction
+   *    @return The size of the Wire receive/transmit buffer */
+  size_t maxBufferSize() { return _maxBufferSize; }
+
+private:
+  uint8_t _addr;
+  TwoWire *_wire;
+  bool _begun;
+  size_t _maxBufferSize;
+  bool _read(uint8_t *buffer, size_t len, bool stop);
+};
+
+#endif // Adafruit_I2CDevice_h

firmware/libraries/Adafruit_BusIO/Adafruit_I2CRegister.h

@@ -0,0 +1,10 @@
+#ifndef _ADAFRUIT_I2C_REGISTER_H_
+#define _ADAFRUIT_I2C_REGISTER_H_
+
+#include <Adafruit_BusIO_Register.h>
+#include <Arduino.h>
+
+typedef Adafruit_BusIO_Register Adafruit_I2CRegister;
+typedef Adafruit_BusIO_RegisterBits Adafruit_I2CRegisterBits;
+
+#endif

firmware/libraries/Adafruit_BusIO/Adafruit_SPIDevice.cpp

@@ -0,0 +1,508 @@
+#include "Adafruit_SPIDevice.h"
+
+//#define DEBUG_SERIAL Serial
+
+/*!
+ *    @brief  Create an SPI device with the given CS pin and settings
+ *    @param  cspin The arduino pin number to use for chip select
+ *    @param  freq The SPI clock frequency to use, defaults to 1MHz
+ *    @param  dataOrder The SPI data order to use for bits within each byte,
+ * defaults to SPI_BITORDER_MSBFIRST
+ *    @param  dataMode The SPI mode to use, defaults to SPI_MODE0
+ *    @param  theSPI The SPI bus to use, defaults to &theSPI
+ */
+Adafruit_SPIDevice::Adafruit_SPIDevice(int8_t cspin, uint32_t freq,
+                                       BusIOBitOrder dataOrder,
+                                       uint8_t dataMode, SPIClass *theSPI) {
+#ifdef BUSIO_HAS_HW_SPI
+  _cs = cspin;
+  _sck = _mosi = _miso = -1;
+  _spi = theSPI;
+  _begun = false;
+  _spiSetting = new SPISettings(freq, dataOrder, dataMode);
+  _freq = freq;
+  _dataOrder = dataOrder;
+  _dataMode = dataMode;
+#else
+  // unused, but needed to suppress compiler warns
+  (void)cspin;
+  (void)freq;
+  (void)dataOrder;
+  (void)dataMode;
+  (void)theSPI;
+#endif
+}
+
+/*!
+ *    @brief  Create an SPI device with the given CS pin and settings
+ *    @param  cspin The arduino pin number to use for chip select
+ *    @param  sckpin The arduino pin number to use for SCK
+ *    @param  misopin The arduino pin number to use for MISO, set to -1 if not
+ * used
+ *    @param  mosipin The arduino pin number to use for MOSI, set to -1 if not
+ * used
+ *    @param  freq The SPI clock frequency to use, defaults to 1MHz
+ *    @param  dataOrder The SPI data order to use for bits within each byte,
+ * defaults to SPI_BITORDER_MSBFIRST
+ *    @param  dataMode The SPI mode to use, defaults to SPI_MODE0
+ */
+Adafruit_SPIDevice::Adafruit_SPIDevice(int8_t cspin, int8_t sckpin,
+                                       int8_t misopin, int8_t mosipin,
+                                       uint32_t freq, BusIOBitOrder dataOrder,
+                                       uint8_t dataMode) {
+  _cs = cspin;
+  _sck = sckpin;
+  _miso = misopin;
+  _mosi = mosipin;
+
+#ifdef BUSIO_USE_FAST_PINIO
+  csPort = (BusIO_PortReg *)portOutputRegister(digitalPinToPort(cspin));
+  csPinMask = digitalPinToBitMask(cspin);
+  if (mosipin != -1) {
+    mosiPort = (BusIO_PortReg *)portOutputRegister(digitalPinToPort(mosipin));
+    mosiPinMask = digitalPinToBitMask(mosipin);
+  }
+  if (misopin != -1) {
+    misoPort = (BusIO_PortReg *)portInputRegister(digitalPinToPort(misopin));
+    misoPinMask = digitalPinToBitMask(misopin);
+  }
+  clkPort = (BusIO_PortReg *)portOutputRegister(digitalPinToPort(sckpin));
+  clkPinMask = digitalPinToBitMask(sckpin);
+#endif
+
+  _freq = freq;
+  _dataOrder = dataOrder;
+  _dataMode = dataMode;
+  _begun = false;
+}
+
+/*!
+ *    @brief  Release memory allocated in constructors
+ */
+Adafruit_SPIDevice::~Adafruit_SPIDevice() {
+  if (_spiSetting)
+    delete _spiSetting;
+}
+
+/*!
+ *    @brief  Initializes SPI bus and sets CS pin high
+ *    @return Always returns true because there's no way to test success of SPI
+ * init
+ */
+bool Adafruit_SPIDevice::begin(void) {
+  if (_cs != -1) {
+    pinMode(_cs, OUTPUT);
+    digitalWrite(_cs, HIGH);
+  }
+
+  if (_spi) { // hardware SPI
+#ifdef BUSIO_HAS_HW_SPI
+    _spi->begin();
+#endif
+  } else {
+    pinMode(_sck, OUTPUT);
+
+    if ((_dataMode == SPI_MODE0) || (_dataMode == SPI_MODE1)) {
+      // idle low on mode 0 and 1
+      digitalWrite(_sck, LOW);
+    } else {
+      // idle high on mode 2 or 3
+      digitalWrite(_sck, HIGH);
+    }
+    if (_mosi != -1) {
+      pinMode(_mosi, OUTPUT);
+      digitalWrite(_mosi, HIGH);
+    }
+    if (_miso != -1) {
+      pinMode(_miso, INPUT);
+    }
+  }
+
+  _begun = true;
+  return true;
+}
+
+/*!
+ *    @brief  Transfer (send/receive) a buffer over hard/soft SPI, without
+ * transaction management
+ *    @param  buffer The buffer to send and receive at the same time
+ *    @param  len    The number of bytes to transfer
+ */
+void Adafruit_SPIDevice::transfer(uint8_t *buffer, size_t len) {
+  //
+  // HARDWARE SPI
+  //
+  if (_spi) {
+#ifdef BUSIO_HAS_HW_SPI
+#if defined(SPARK)
+    _spi->transfer(buffer, buffer, len, nullptr);
+#elif defined(STM32)
+    for (size_t i = 0; i < len; i++) {
+      _spi->transfer(buffer[i]);
+    }
+#else
+    _spi->transfer(buffer, len);
+#endif
+    return;
+#endif
+  }
+
+  //
+  // SOFTWARE SPI
+  //
+  uint8_t startbit;
+  if (_dataOrder == SPI_BITORDER_LSBFIRST) {
+    startbit = 0x1;
+  } else {
+    startbit = 0x80;
+  }
+
+  bool towrite, lastmosi = !(buffer[0] & startbit);
+  uint8_t bitdelay_us = (1000000 / _freq) / 2;
+
+  for (size_t i = 0; i < len; i++) {
+    uint8_t reply = 0;
+    uint8_t send = buffer[i];
+
+    /*
+    Serial.print("\tSending software SPI byte 0x");
+    Serial.print(send, HEX);
+    Serial.print(" -> 0x");
+    */
+
+    // Serial.print(send, HEX);
+    for (uint8_t b = startbit; b != 0;
+         b = (_dataOrder == SPI_BITORDER_LSBFIRST) ? b << 1 : b >> 1) {
+
+      if (bitdelay_us) {
+        delayMicroseconds(bitdelay_us);
+      }
+
+      if (_dataMode == SPI_MODE0 || _dataMode == SPI_MODE2) {
+        towrite = send & b;
+        if ((_mosi != -1) && (lastmosi != towrite)) {
+#ifdef BUSIO_USE_FAST_PINIO
+          if (towrite)
+            *mosiPort |= mosiPinMask;
+          else
+            *mosiPort &= ~mosiPinMask;
+#else
+          digitalWrite(_mosi, towrite);
+#endif
+          lastmosi = towrite;
+        }
+
+#ifdef BUSIO_USE_FAST_PINIO
+        *clkPort |= clkPinMask; // Clock high
+#else
+        digitalWrite(_sck, HIGH);
+#endif
+
+        if (bitdelay_us) {
+          delayMicroseconds(bitdelay_us);
+        }
+
+        if (_miso != -1) {
+#ifdef BUSIO_USE_FAST_PINIO
+          if (*misoPort & misoPinMask) {
+#else
+          if (digitalRead(_miso)) {
+#endif
+            reply |= b;
+          }
+        }
+
+#ifdef BUSIO_USE_FAST_PINIO
+        *clkPort &= ~clkPinMask; // Clock low
+#else
+        digitalWrite(_sck, LOW);
+#endif
+      } else { // if (_dataMode == SPI_MODE1 || _dataMode == SPI_MODE3)
+
+#ifdef BUSIO_USE_FAST_PINIO
+        *clkPort |= clkPinMask; // Clock high
+#else
+        digitalWrite(_sck, HIGH);
+#endif
+
+        if (bitdelay_us) {
+          delayMicroseconds(bitdelay_us);
+        }
+
+        if (_mosi != -1) {
+#ifdef BUSIO_USE_FAST_PINIO
+          if (send & b)
+            *mosiPort |= mosiPinMask;
+          else
+            *mosiPort &= ~mosiPinMask;
+#else
+          digitalWrite(_mosi, send & b);
+#endif
+        }
+
+#ifdef BUSIO_USE_FAST_PINIO
+        *clkPort &= ~clkPinMask; // Clock low
+#else
+        digitalWrite(_sck, LOW);
+#endif
+
+        if (_miso != -1) {
+#ifdef BUSIO_USE_FAST_PINIO
+          if (*misoPort & misoPinMask) {
+#else
+          if (digitalRead(_miso)) {
+#endif
+            reply |= b;
+          }
+        }
+      }
+      if (_miso != -1) {
+        buffer[i] = reply;
+      }
+    }
+  }
+  return;
+}
+
+/*!
+ *    @brief  Transfer (send/receive) one byte over hard/soft SPI, without
+ * transaction management
+ *    @param  send The byte to send
+ *    @return The byte received while transmitting
+ */
+uint8_t Adafruit_SPIDevice::transfer(uint8_t send) {
+  uint8_t data = send;
+  transfer(&data, 1);
+  return data;
+}
+
+/*!
+ *    @brief  Manually begin a transaction (calls beginTransaction if hardware
+ * SPI)
+ */
+void Adafruit_SPIDevice::beginTransaction(void) {
+  if (_spi) {
+#ifdef BUSIO_HAS_HW_SPI
+    _spi->beginTransaction(*_spiSetting);
+#endif
+  }
+}
+
+/*!
+ *    @brief  Manually end a transaction (calls endTransaction if hardware SPI)
+ */
+void Adafruit_SPIDevice::endTransaction(void) {
+  if (_spi) {
+#ifdef BUSIO_HAS_HW_SPI
+    _spi->endTransaction();
+#endif
+  }
+}
+
+/*!
+ *    @brief  Assert/Deassert the CS pin if it is defined
+ *    @param  value The state the CS is set to
+ */
+void Adafruit_SPIDevice::setChipSelect(int value) {
+  if (_cs != -1) {
+    digitalWrite(_cs, value);
+  }
+}
+
+/*!
+ *    @brief  Write a buffer or two to the SPI device, with transaction
+ * management.
+ *    @brief  Manually begin a transaction (calls beginTransaction if hardware
+ *            SPI) with asserting the CS pin
+ */
+void Adafruit_SPIDevice::beginTransactionWithAssertingCS() {
+  beginTransaction();
+  setChipSelect(LOW);
+}
+
+/*!
+ *    @brief  Manually end a transaction (calls endTransaction if hardware SPI)
+ *            with deasserting the CS pin
+ */
+void Adafruit_SPIDevice::endTransactionWithDeassertingCS() {
+  setChipSelect(HIGH);
+  endTransaction();
+}
+
+/*!
+ *    @brief  Write a buffer or two to the SPI device, with transaction
+ * management.
+ *    @param  buffer Pointer to buffer of data to write
+ *    @param  len Number of bytes from buffer to write
+ *    @param  prefix_buffer Pointer to optional array of data to write before
+ * buffer.
+ *    @param  prefix_len Number of bytes from prefix buffer to write
+ *    @return Always returns true because there's no way to test success of SPI
+ * writes
+ */
+bool Adafruit_SPIDevice::write(const uint8_t *buffer, size_t len,
+                               const uint8_t *prefix_buffer,
+                               size_t prefix_len) {
+  beginTransactionWithAssertingCS();
+
+  // do the writing
+#if defined(ARDUINO_ARCH_ESP32)
+  if (_spi) {
+    if (prefix_len > 0) {
+      _spi->transferBytes(prefix_buffer, nullptr, prefix_len);
+    }
+    if (len > 0) {
+      _spi->transferBytes(buffer, nullptr, len);
+    }
+  } else
+#endif
+  {
+    for (size_t i = 0; i < prefix_len; i++) {
+      transfer(prefix_buffer[i]);
+    }
+    for (size_t i = 0; i < len; i++) {
+      transfer(buffer[i]);
+    }
+  }
+  endTransactionWithDeassertingCS();
+
+#ifdef DEBUG_SERIAL
+  DEBUG_SERIAL.print(F("\tSPIDevice Wrote: "));
+  if ((prefix_len != 0) && (prefix_buffer != nullptr)) {
+    for (uint16_t i = 0; i < prefix_len; i++) {
+      DEBUG_SERIAL.print(F("0x"));
+      DEBUG_SERIAL.print(prefix_buffer[i], HEX);
+      DEBUG_SERIAL.print(F(", "));
+    }
+  }
+  for (uint16_t i = 0; i < len; i++) {
+    DEBUG_SERIAL.print(F("0x"));
+    DEBUG_SERIAL.print(buffer[i], HEX);
+    DEBUG_SERIAL.print(F(", "));
+    if (i % 32 == 31) {
+      DEBUG_SERIAL.println();
+    }
+  }
+  DEBUG_SERIAL.println();
+#endif
+
+  return true;
+}
+
+/*!
+ *    @brief  Read from SPI into a buffer from the SPI device, with transaction
+ * management.
+ *    @param  buffer Pointer to buffer of data to read into
+ *    @param  len Number of bytes from buffer to read.
+ *    @param  sendvalue The 8-bits of data to write when doing the data read,
+ * defaults to 0xFF
+ *    @return Always returns true because there's no way to test success of SPI
+ * writes
+ */
+bool Adafruit_SPIDevice::read(uint8_t *buffer, size_t len, uint8_t sendvalue) {
+  memset(buffer, sendvalue, len); // clear out existing buffer
+
+  beginTransactionWithAssertingCS();
+  transfer(buffer, len);
+  endTransactionWithDeassertingCS();
+
+#ifdef DEBUG_SERIAL
+  DEBUG_SERIAL.print(F("\tSPIDevice Read: "));
+  for (uint16_t i = 0; i < len; i++) {
+    DEBUG_SERIAL.print(F("0x"));
+    DEBUG_SERIAL.print(buffer[i], HEX);
+    DEBUG_SERIAL.print(F(", "));
+    if (len % 32 == 31) {
+      DEBUG_SERIAL.println();
+    }
+  }
+  DEBUG_SERIAL.println();
+#endif
+
+  return true;
+}
+
+/*!
+ *    @brief  Write some data, then read some data from SPI into another buffer,
+ * with transaction management. The buffers can point to same/overlapping
+ * locations. This does not transmit-receive at the same time!
+ *    @param  write_buffer Pointer to buffer of data to write from
+ *    @param  write_len Number of bytes from buffer to write.
+ *    @param  read_buffer Pointer to buffer of data to read into.
+ *    @param  read_len Number of bytes from buffer to read.
+ *    @param  sendvalue The 8-bits of data to write when doing the data read,
+ * defaults to 0xFF
+ *    @return Always returns true because there's no way to test success of SPI
+ * writes
+ */
+bool Adafruit_SPIDevice::write_then_read(const uint8_t *write_buffer,
+                                         size_t write_len, uint8_t *read_buffer,
+                                         size_t read_len, uint8_t sendvalue) {
+  beginTransactionWithAssertingCS();
+  // do the writing
+#if defined(ARDUINO_ARCH_ESP32)
+  if (_spi) {
+    if (write_len > 0) {
+      _spi->transferBytes(write_buffer, nullptr, write_len);
+    }
+  } else
+#endif
+  {
+    for (size_t i = 0; i < write_len; i++) {
+      transfer(write_buffer[i]);
+    }
+  }
+
+#ifdef DEBUG_SERIAL
+  DEBUG_SERIAL.print(F("\tSPIDevice Wrote: "));
+  for (uint16_t i = 0; i < write_len; i++) {
+    DEBUG_SERIAL.print(F("0x"));
+    DEBUG_SERIAL.print(write_buffer[i], HEX);
+    DEBUG_SERIAL.print(F(", "));
+    if (write_len % 32 == 31) {
+      DEBUG_SERIAL.println();
+    }
+  }
+  DEBUG_SERIAL.println();
+#endif
+
+  // do the reading
+  for (size_t i = 0; i < read_len; i++) {
+    read_buffer[i] = transfer(sendvalue);
+  }
+
+#ifdef DEBUG_SERIAL
+  DEBUG_SERIAL.print(F("\tSPIDevice Read: "));
+  for (uint16_t i = 0; i < read_len; i++) {
+    DEBUG_SERIAL.print(F("0x"));
+    DEBUG_SERIAL.print(read_buffer[i], HEX);
+    DEBUG_SERIAL.print(F(", "));
+    if (read_len % 32 == 31) {
+      DEBUG_SERIAL.println();
+    }
+  }
+  DEBUG_SERIAL.println();
+#endif
+
+  endTransactionWithDeassertingCS();
+
+  return true;
+}
+
+/*!
+ *    @brief  Write some data and read some data at the same time from SPI
+ * into the same buffer, with transaction management. This is basicaly a wrapper
+ * for transfer() with CS-pin and transaction management. This /does/
+ * transmit-receive at the same time!
+ *    @param  buffer Pointer to buffer of data to write/read to/from
+ *    @param  len Number of bytes from buffer to write/read.
+ *    @return Always returns true because there's no way to test success of SPI
+ * writes
+ */
+bool Adafruit_SPIDevice::write_and_read(uint8_t *buffer, size_t len) {
+  beginTransactionWithAssertingCS();
+  transfer(buffer, len);
+  endTransactionWithDeassertingCS();
+
+  return true;
+}

firmware/libraries/Adafruit_BusIO/Adafruit_SPIDevice.h

@@ -0,0 +1,138 @@
+#ifndef Adafruit_SPIDevice_h
+#define Adafruit_SPIDevice_h
+
+#include <Arduino.h>
+
+#if !defined(SPI_INTERFACES_COUNT) ||                                          \
+    (defined(SPI_INTERFACES_COUNT) && (SPI_INTERFACES_COUNT > 0))
+// HW SPI available
+#include <SPI.h>
+#define BUSIO_HAS_HW_SPI
+#else
+// SW SPI ONLY
+enum { SPI_MODE0, SPI_MODE1, SPI_MODE2, _SPI_MODE4 };
+typedef uint8_t SPIClass;
+#endif
+
+// some modern SPI definitions don't have BitOrder enum
+#if (defined(__AVR__) && !defined(ARDUINO_ARCH_MEGAAVR)) ||                    \
+    defined(ESP8266) || defined(TEENSYDUINO) || defined(SPARK) ||              \
+    defined(ARDUINO_ARCH_SPRESENSE) || defined(MEGATINYCORE) ||                \
+    defined(DXCORE) || defined(ARDUINO_AVR_ATmega4809) ||                      \
+    defined(ARDUINO_AVR_ATmega4808) || defined(ARDUINO_AVR_ATmega3209) ||      \
+    defined(ARDUINO_AVR_ATmega3208) || defined(ARDUINO_AVR_ATmega1609) ||      \
+    defined(ARDUINO_AVR_ATmega1608) || defined(ARDUINO_AVR_ATmega809) ||       \
+    defined(ARDUINO_AVR_ATmega808) || defined(ARDUINO_ARCH_ARC32)
+
+typedef enum _BitOrder {
+  SPI_BITORDER_MSBFIRST = MSBFIRST,
+  SPI_BITORDER_LSBFIRST = LSBFIRST,
+} BusIOBitOrder;
+
+#elif defined(ESP32) || defined(__ASR6501__) || defined(__ASR6502__)
+
+// some modern SPI definitions don't have BitOrder enum and have different SPI
+// mode defines
+typedef enum _BitOrder {
+  SPI_BITORDER_MSBFIRST = SPI_MSBFIRST,
+  SPI_BITORDER_LSBFIRST = SPI_LSBFIRST,
+} BusIOBitOrder;
+
+#else
+// Some platforms have a BitOrder enum but its named MSBFIRST/LSBFIRST
+#define SPI_BITORDER_MSBFIRST MSBFIRST
+#define SPI_BITORDER_LSBFIRST LSBFIRST
+typedef BitOrder BusIOBitOrder;
+#endif
+
+#if defined(__IMXRT1062__) // Teensy 4.x
+// *Warning* I disabled the usage of FAST_PINIO as the set/clear operations
+// used in the cpp file are not atomic and can effect multiple IO pins
+// and if an interrupt happens in between the time the code reads the register
+//  and writes out the updated value, that changes one or more other IO pins
+// on that same IO port, those change will be clobbered when the updated
+// values are written back.  A fast version can be implemented that uses the
+// ports set and clear registers which are atomic.
+// typedef volatile uint32_t BusIO_PortReg;
+// typedef uint32_t BusIO_PortMask;
+//#define BUSIO_USE_FAST_PINIO
+
+#elif defined(__AVR__) || defined(TEENSYDUINO)
+typedef volatile uint8_t BusIO_PortReg;
+typedef uint8_t BusIO_PortMask;
+#define BUSIO_USE_FAST_PINIO
+
+#elif defined(ESP8266) || defined(ESP32) || defined(__SAM3X8E__) ||            \
+    defined(ARDUINO_ARCH_SAMD)
+typedef volatile uint32_t BusIO_PortReg;
+typedef uint32_t BusIO_PortMask;
+#define BUSIO_USE_FAST_PINIO
+
+#elif (defined(__arm__) || defined(ARDUINO_FEATHER52)) &&                      \
+    !defined(ARDUINO_ARCH_MBED) && !defined(ARDUINO_ARCH_RP2040)
+typedef volatile uint32_t BusIO_PortReg;
+typedef uint32_t BusIO_PortMask;
+#if !defined(__ASR6501__) && !defined(__ASR6502__)
+#define BUSIO_USE_FAST_PINIO
+#endif
+
+#else
+#undef BUSIO_USE_FAST_PINIO
+#endif
+
+/**! The class which defines how we will talk to this device over SPI **/
+class Adafruit_SPIDevice {
+public:
+#ifdef BUSIO_HAS_HW_SPI
+  Adafruit_SPIDevice(int8_t cspin, uint32_t freq = 1000000,
+                     BusIOBitOrder dataOrder = SPI_BITORDER_MSBFIRST,
+                     uint8_t dataMode = SPI_MODE0, SPIClass *theSPI = &SPI);
+#else
+  Adafruit_SPIDevice(int8_t cspin, uint32_t freq = 1000000,
+                     BusIOBitOrder dataOrder = SPI_BITORDER_MSBFIRST,
+                     uint8_t dataMode = SPI_MODE0, SPIClass *theSPI = nullptr);
+#endif
+  Adafruit_SPIDevice(int8_t cspin, int8_t sck, int8_t miso, int8_t mosi,
+                     uint32_t freq = 1000000,
+                     BusIOBitOrder dataOrder = SPI_BITORDER_MSBFIRST,
+                     uint8_t dataMode = SPI_MODE0);
+  ~Adafruit_SPIDevice();
+
+  bool begin(void);
+  bool read(uint8_t *buffer, size_t len, uint8_t sendvalue = 0xFF);
+  bool write(const uint8_t *buffer, size_t len,
+             const uint8_t *prefix_buffer = nullptr, size_t prefix_len = 0);
+  bool write_then_read(const uint8_t *write_buffer, size_t write_len,
+                       uint8_t *read_buffer, size_t read_len,
+                       uint8_t sendvalue = 0xFF);
+  bool write_and_read(uint8_t *buffer, size_t len);
+
+  uint8_t transfer(uint8_t send);
+  void transfer(uint8_t *buffer, size_t len);
+  void beginTransaction(void);
+  void endTransaction(void);
+  void beginTransactionWithAssertingCS();
+  void endTransactionWithDeassertingCS();
+
+private:
+#ifdef BUSIO_HAS_HW_SPI
+  SPIClass *_spi = nullptr;
+  SPISettings *_spiSetting = nullptr;
+#else
+  uint8_t *_spi = nullptr;
+  uint8_t *_spiSetting = nullptr;
+#endif
+  uint32_t _freq;
+  BusIOBitOrder _dataOrder;
+  uint8_t _dataMode;
+  void setChipSelect(int value);
+
+  int8_t _cs, _sck, _mosi, _miso;
+#ifdef BUSIO_USE_FAST_PINIO
+  BusIO_PortReg *mosiPort, *clkPort, *misoPort, *csPort;
+  BusIO_PortMask mosiPinMask, misoPinMask, clkPinMask, csPinMask;
+#endif
+  bool _begun;
+};
+
+#endif // Adafruit_SPIDevice_h

firmware/libraries/Adafruit_BusIO/CMakeLists.txt

@@ -0,0 +1,11 @@
+# Adafruit Bus IO Library
+# https://github.com/adafruit/Adafruit_BusIO
+# MIT License
+
+cmake_minimum_required(VERSION 3.5)
+
+idf_component_register(SRCS "Adafruit_I2CDevice.cpp" "Adafruit_BusIO_Register.cpp" "Adafruit_SPIDevice.cpp" 
+                       INCLUDE_DIRS "."
+                       REQUIRES arduino)
+
+project(Adafruit_BusIO)

firmware/libraries/Adafruit_BusIO/LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2017 Adafruit Industries
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

firmware/libraries/Adafruit_BusIO/README.md

@@ -0,0 +1,8 @@
+# Adafruit Bus IO Library [![Build Status](https://github.com/adafruit/Adafruit_BusIO/workflows/Arduino%20Library%20CI/badge.svg)](https://github.com/adafruit/Adafruit_BusIO/actions)
+
+
+This is a helper library to abstract away I2C & SPI transactions and registers
+
+Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit!
+
+MIT license, all text above must be included in any redistribution

firmware/libraries/Adafruit_BusIO/component.mk

@@ -0,0 +1 @@
+COMPONENT_ADD_INCLUDEDIRS = .

firmware/libraries/Adafruit_BusIO/examples/i2c_address_detect/i2c_address_detect.ino

@@ -0,0 +1,21 @@
+#include <Adafruit_I2CDevice.h>
+
+Adafruit_I2CDevice i2c_dev = Adafruit_I2CDevice(0x10);
+
+void setup() {
+  while (!Serial) { delay(10); }
+  Serial.begin(115200);
+  Serial.println("I2C address detection test");
+
+  if (!i2c_dev.begin()) {
+    Serial.print("Did not find device at 0x");
+    Serial.println(i2c_dev.address(), HEX);
+    while (1);
+  }
+  Serial.print("Device found on address 0x");
+  Serial.println(i2c_dev.address(), HEX);
+}
+
+void loop() {
+  
+}

firmware/libraries/Adafruit_BusIO/examples/i2c_readwrite/i2c_readwrite.ino

@@ -0,0 +1,41 @@
+#include <Adafruit_I2CDevice.h>
+
+#define I2C_ADDRESS 0x60
+Adafruit_I2CDevice i2c_dev = Adafruit_I2CDevice(I2C_ADDRESS);
+
+
+void setup() {
+  while (!Serial) { delay(10); }
+  Serial.begin(115200);
+  Serial.println("I2C device read and write test");
+
+  if (!i2c_dev.begin()) {
+    Serial.print("Did not find device at 0x");
+    Serial.println(i2c_dev.address(), HEX);
+    while (1);
+  }
+  Serial.print("Device found on address 0x");
+  Serial.println(i2c_dev.address(), HEX);
+
+  uint8_t buffer[32];
+  // Try to read 32 bytes
+  i2c_dev.read(buffer, 32);
+  Serial.print("Read: ");
+  for (uint8_t i=0; i<32; i++) {
+    Serial.print("0x"); Serial.print(buffer[i], HEX); Serial.print(", ");
+  }
+  Serial.println();
+
+  // read a register by writing first, then reading
+  buffer[0] = 0x0C;  // we'll reuse the same buffer
+  i2c_dev.write_then_read(buffer, 1, buffer, 2, false);
+  Serial.print("Write then Read: ");
+  for (uint8_t i=0; i<2; i++) {
+    Serial.print("0x"); Serial.print(buffer[i], HEX); Serial.print(", ");
+  }
+  Serial.println();
+}
+
+void loop() {
+  
+}

firmware/libraries/Adafruit_BusIO/examples/i2c_registers/i2c_registers.ino

@@ -0,0 +1,38 @@
+#include <Adafruit_I2CDevice.h>
+#include <Adafruit_BusIO_Register.h>
+
+#define I2C_ADDRESS 0x60
+Adafruit_I2CDevice i2c_dev = Adafruit_I2CDevice(I2C_ADDRESS);
+
+
+void setup() {
+  while (!Serial) { delay(10); }
+  Serial.begin(115200);
+  Serial.println("I2C device register test");
+
+  if (!i2c_dev.begin()) {
+    Serial.print("Did not find device at 0x");
+    Serial.println(i2c_dev.address(), HEX);
+    while (1);
+  }
+  Serial.print("Device found on address 0x");
+  Serial.println(i2c_dev.address(), HEX);
+
+  Adafruit_BusIO_Register id_reg = Adafruit_BusIO_Register(&i2c_dev, 0x0C, 2, LSBFIRST);
+  uint16_t id;
+  id_reg.read(&id);
+  Serial.print("ID register = 0x"); Serial.println(id, HEX);
+
+  Adafruit_BusIO_Register thresh_reg = Adafruit_BusIO_Register(&i2c_dev, 0x01, 2, LSBFIRST);
+  uint16_t thresh;
+  thresh_reg.read(&thresh);
+  Serial.print("Initial threshold register = 0x"); Serial.println(thresh, HEX);
+
+  thresh_reg.write(~thresh);
+
+  Serial.print("Post threshold register = 0x"); Serial.println(thresh_reg.read(), HEX);
+}
+
+void loop() {
+  
+}

firmware/libraries/Adafruit_BusIO/examples/i2corspi_register/i2corspi_register.ino

@@ -0,0 +1,38 @@
+#include <Adafruit_BusIO_Register.h>
+
+// Define which interface to use by setting the unused interface to NULL!
+
+#define SPIDEVICE_CS 10
+Adafruit_SPIDevice *spi_dev = NULL; // new Adafruit_SPIDevice(SPIDEVICE_CS);
+
+#define I2C_ADDRESS 0x5D
+Adafruit_I2CDevice *i2c_dev = new Adafruit_I2CDevice(I2C_ADDRESS);
+
+void setup() {
+  while (!Serial) { delay(10); }
+  Serial.begin(115200);
+  Serial.println("I2C or SPI device register test");
+
+  if (spi_dev && !spi_dev->begin()) {
+    Serial.println("Could not initialize SPI device");
+  }
+
+  if (i2c_dev) {
+    if (i2c_dev->begin()) {
+      Serial.print("Device found on I2C address 0x");
+      Serial.println(i2c_dev->address(), HEX);
+    } else {
+      Serial.print("Did not find I2C device at 0x");
+      Serial.println(i2c_dev->address(), HEX);
+    }
+  }
+
+  Adafruit_BusIO_Register id_reg = Adafruit_BusIO_Register(i2c_dev, spi_dev, ADDRBIT8_HIGH_TOREAD, 0x0F);
+  uint8_t id=0;
+  id_reg.read(&id);
+  Serial.print("ID register = 0x"); Serial.println(id, HEX);
+}
+
+void loop() {
+  
+}

firmware/libraries/Adafruit_BusIO/examples/spi_modetest/spi_modetest.ino

@@ -0,0 +1,29 @@
+#include <Adafruit_SPIDevice.h>
+
+#define SPIDEVICE_CS 10
+Adafruit_SPIDevice spi_dev = Adafruit_SPIDevice(SPIDEVICE_CS, 100000, SPI_BITORDER_MSBFIRST, SPI_MODE1);
+//Adafruit_SPIDevice spi_dev = Adafruit_SPIDevice(SPIDEVICE_CS, 13, 12, 11, 100000, SPI_BITORDER_MSBFIRST, SPI_MODE1);
+
+
+void setup() {
+  while (!Serial) { delay(10); }
+  Serial.begin(115200);
+  Serial.println("SPI device mode test");
+
+  if (!spi_dev.begin()) {
+    Serial.println("Could not initialize SPI device");
+    while (1);
+  }
+}
+
+void loop() {
+  Serial.println("\n\nTransfer test");
+  for (uint16_t x=0; x<=0xFF; x++) {
+    uint8_t i = x;   
+    Serial.print("0x"); Serial.print(i, HEX); 
+    spi_dev.read(&i, 1, i);
+    Serial.print("/"); Serial.print(i, HEX);
+    Serial.print(", ");
+    delay(25);
+  }
+}

firmware/libraries/Adafruit_BusIO/examples/spi_readwrite/spi_readwrite.ino

@@ -0,0 +1,39 @@
+#include <Adafruit_SPIDevice.h>
+
+#define SPIDEVICE_CS 10
+Adafruit_SPIDevice spi_dev = Adafruit_SPIDevice(SPIDEVICE_CS);
+
+
+void setup() {
+  while (!Serial) { delay(10); }
+  Serial.begin(115200);
+  Serial.println("SPI device read and write test");
+
+  if (!spi_dev.begin()) {
+    Serial.println("Could not initialize SPI device");
+    while (1);
+  }
+
+  uint8_t buffer[32];
+
+  // Try to read 32 bytes
+  spi_dev.read(buffer, 32);
+  Serial.print("Read: ");
+  for (uint8_t i=0; i<32; i++) {
+    Serial.print("0x"); Serial.print(buffer[i], HEX); Serial.print(", ");
+  }
+  Serial.println();
+
+  // read a register by writing first, then reading
+  buffer[0] = 0x8F;  // we'll reuse the same buffer
+  spi_dev.write_then_read(buffer, 1, buffer, 2, false);
+  Serial.print("Write then Read: ");
+  for (uint8_t i=0; i<2; i++) {
+    Serial.print("0x"); Serial.print(buffer[i], HEX); Serial.print(", ");
+  }
+  Serial.println();
+}
+
+void loop() {
+  
+}

firmware/libraries/Adafruit_BusIO/examples/spi_register_bits/spi_register_bits.ino

@@ -0,0 +1,192 @@
+/*************************************************** 
+
+  This is an example for how to use Adafruit_BusIO_RegisterBits from Adafruit_BusIO library.
+
+  Designed specifically to work with the Adafruit RTD Sensor
+  ----> https://www.adafruit.com/products/3328
+  uisng a MAX31865 RTD-to-Digital Converter
+  ----> https://datasheets.maximintegrated.com/en/ds/MAX31865.pdf
+
+  This sensor uses SPI to communicate, 4 pins are required to  
+  interface.
+  A fifth pin helps to detect when a new conversion is ready.
+
+  Adafruit invests time and resources providing this open source code, 
+  please support Adafruit and open-source hardware by purchasing 
+  products from Adafruit!
+
+  Example written (2020/3) by Andreas Hardtung/AnHard.  
+  BSD license, all text above must be included in any redistribution
+ ****************************************************/
+
+#include <Adafruit_BusIO_Register.h>
+#include <Adafruit_SPIDevice.h>
+
+#define MAX31865_SPI_SPEED    (5000000)
+#define MAX31865_SPI_BITORDER (SPI_BITORDER_MSBFIRST)
+#define MAX31865_SPI_MODE     (SPI_MODE1)
+
+#define MAX31865_SPI_CS       (10)
+#define MAX31865_READY_PIN    (2)
+
+
+Adafruit_SPIDevice spi_dev = Adafruit_SPIDevice( MAX31865_SPI_CS, MAX31865_SPI_SPEED, MAX31865_SPI_BITORDER, MAX31865_SPI_MODE, &SPI); // Hardware SPI
+// Adafruit_SPIDevice spi_dev = Adafruit_SPIDevice( MAX31865_SPI_CS, 13, 12, 11, MAX31865_SPI_SPEED, MAX31865_SPI_BITORDER, MAX31865_SPI_MODE); // Software SPI
+
+// MAX31865 chip related *********************************************************************************************
+Adafruit_BusIO_Register     config_reg  = Adafruit_BusIO_Register(&spi_dev, 0x00, ADDRBIT8_HIGH_TOWRITE, 1, MSBFIRST);
+Adafruit_BusIO_RegisterBits   bias_bit  = Adafruit_BusIO_RegisterBits(&config_reg, 1, 7);
+Adafruit_BusIO_RegisterBits   auto_bit  = Adafruit_BusIO_RegisterBits(&config_reg, 1, 6);
+Adafruit_BusIO_RegisterBits   oneS_bit  = Adafruit_BusIO_RegisterBits(&config_reg, 1, 5);
+Adafruit_BusIO_RegisterBits   wire_bit  = Adafruit_BusIO_RegisterBits(&config_reg, 1, 4);
+Adafruit_BusIO_RegisterBits faultT_bits = Adafruit_BusIO_RegisterBits(&config_reg, 2, 2);
+Adafruit_BusIO_RegisterBits faultR_bit  = Adafruit_BusIO_RegisterBits(&config_reg, 1, 1);
+Adafruit_BusIO_RegisterBits fi50hz_bit  = Adafruit_BusIO_RegisterBits(&config_reg, 1, 0);
+
+Adafruit_BusIO_Register     rRatio_reg  = Adafruit_BusIO_Register(&spi_dev, 0x01, ADDRBIT8_HIGH_TOWRITE, 2, MSBFIRST);
+Adafruit_BusIO_RegisterBits rRatio_bits = Adafruit_BusIO_RegisterBits(&rRatio_reg, 15, 1);
+Adafruit_BusIO_RegisterBits  fault_bit  = Adafruit_BusIO_RegisterBits(&rRatio_reg,  1, 0);
+
+Adafruit_BusIO_Register      maxRratio_reg = Adafruit_BusIO_Register(&spi_dev, 0x03, ADDRBIT8_HIGH_TOWRITE, 2, MSBFIRST);
+Adafruit_BusIO_RegisterBits maxRratio_bits = Adafruit_BusIO_RegisterBits(&maxRratio_reg, 15, 1);
+
+Adafruit_BusIO_Register      minRratio_reg = Adafruit_BusIO_Register(&spi_dev, 0x05, ADDRBIT8_HIGH_TOWRITE, 2, MSBFIRST);
+Adafruit_BusIO_RegisterBits minRratio_bits = Adafruit_BusIO_RegisterBits(&minRratio_reg, 15, 1);
+
+Adafruit_BusIO_Register                fault_reg = Adafruit_BusIO_Register(&spi_dev, 0x07, ADDRBIT8_HIGH_TOWRITE, 1, MSBFIRST);
+Adafruit_BusIO_RegisterBits range_high_fault_bit = Adafruit_BusIO_RegisterBits(&fault_reg, 1, 7);
+Adafruit_BusIO_RegisterBits  range_low_fault_bit = Adafruit_BusIO_RegisterBits(&fault_reg, 1, 6);
+Adafruit_BusIO_RegisterBits refin_high_fault_bit = Adafruit_BusIO_RegisterBits(&fault_reg, 1, 5);
+Adafruit_BusIO_RegisterBits  refin_low_fault_bit = Adafruit_BusIO_RegisterBits(&fault_reg, 1, 4);
+Adafruit_BusIO_RegisterBits  rtdin_low_fault_bit = Adafruit_BusIO_RegisterBits(&fault_reg, 1, 3);
+Adafruit_BusIO_RegisterBits    voltage_fault_bit = Adafruit_BusIO_RegisterBits(&fault_reg, 1, 2);
+
+// Print the details of the configuration register.
+void printConfig( void ) {
+  Serial.print("BIAS: ");         if (bias_bit.read() )   Serial.print("ON");   else Serial.print("OFF");
+  Serial.print(", AUTO: ");       if (auto_bit.read() )   Serial.print("ON");   else Serial.print("OFF");
+  Serial.print(", ONES: ");       if (oneS_bit.read() )   Serial.print("ON");   else Serial.print("OFF");
+  Serial.print(", WIRE: ");       if (wire_bit.read() )   Serial.print("3");    else Serial.print("2/4");
+  Serial.print(", FAULTCLEAR: "); if (faultR_bit.read() ) Serial.print("ON");   else Serial.print("OFF");
+  Serial.print(", ");             if (fi50hz_bit.read() ) Serial.print("50HZ"); else Serial.print("60HZ");
+  Serial.println();
+}
+
+// Check and print faults. Then clear them.
+void checkFaults( void ) {
+  if (fault_bit.read()) {
+    Serial.print("MAX: "); Serial.println(maxRratio_bits.read());
+    Serial.print("VAL: "); Serial.println(   rRatio_bits.read());
+    Serial.print("MIN: "); Serial.println(minRratio_bits.read());
+
+    if (range_high_fault_bit.read() ) Serial.println("Range high fault");
+    if ( range_low_fault_bit.read() ) Serial.println("Range low fault");
+    if (refin_high_fault_bit.read() ) Serial.println("REFIN high fault");
+    if ( refin_low_fault_bit.read() ) Serial.println("REFIN low fault");
+    if ( rtdin_low_fault_bit.read() ) Serial.println("RTDIN low fault");
+    if (   voltage_fault_bit.read() ) Serial.println("Voltage fault");
+
+    faultR_bit.write(1); // clear fault
+  }
+}
+
+void setup() {
+  #if (MAX31865_1_READY_PIN != -1)
+    pinMode(MAX31865_READY_PIN ,INPUT_PULLUP);
+  #endif
+
+  while (!Serial) { delay(10); }
+  Serial.begin(115200);
+  Serial.println("SPI Adafruit_BusIO_RegisterBits test on MAX31865");
+
+  if (!spi_dev.begin()) {
+    Serial.println("Could not initialize SPI device");
+    while (1);
+  }
+
+  // Set up for automode 50Hz. We don't care about selfheating. We want the highest possible sampling rate.
+  auto_bit.write(0);   // Don't switch filtermode while auto_mode is on.
+  fi50hz_bit.write(1); // Set filter to 50Hz mode.
+  faultR_bit.write(1); // Clear faults.
+  bias_bit.write(1);   // In automode we want to have the bias current always on.
+  delay(5);            // Wait until bias current settles down.
+                       // 10.5 time constants of the input RC network is required.
+                       // 10ms worst case for 10kω reference resistor and a 0.1µF capacitor across the RTD inputs.
+                       // Adafruit Module has 0.1µF and only 430/4300ω So here 0.43/4.3ms
+  auto_bit.write(1);   // Now we can set automode. Automatically starting first conversion.
+
+  // Test the READY_PIN
+  #if (defined( MAX31865_READY_PIN ) && (MAX31865_READY_PIN != -1))
+    int i = 0;
+    while (digitalRead(MAX31865_READY_PIN) && i++ <= 100) { delay(1); }
+    if (i >= 100) {
+      Serial.print("ERROR: Max31865 Pin detection does not work. PIN:");
+      Serial.println(MAX31865_READY_PIN);
+    }
+  #else
+    delay(100);
+  #endif
+
+  // Set ratio range.
+  // Setting the temperatures would need some more calculation - not related to Adafruit_BusIO_RegisterBits.
+  uint16_t ratio = rRatio_bits.read();
+  maxRratio_bits.write( (ratio < 0x8fffu-1000u) ? ratio + 1000u : 0x8fffu ); 
+  minRratio_bits.write( (ratio >         1000u) ? ratio - 1000u : 0u      );
+
+  printConfig();
+  checkFaults();
+}
+
+void loop() {
+  #if (defined( MAX31865_READY_PIN ) && (MAX31865_1_READY_PIN != -1))
+    // Is conversion ready?
+    if (!digitalRead(MAX31865_READY_PIN))
+  #else
+    // Warant conversion is ready.
+    delay(21); // 21ms for 50Hz-mode. 19ms in 60Hz-mode.
+  #endif
+    {
+      // Read ratio, calculate temperature, scale, filter and print.
+      Serial.println( rRatio2C( rRatio_bits.read() ) * 100.0f, 0); // Temperature scaled by 100
+      // Check, print, clear faults.
+      checkFaults();
+    }
+
+  // Do something else.
+  //delay(15000);
+}
+
+
+// Module/Sensor related. Here Adafruit PT100 module with a 2_Wire PT100 Class C *****************************
+float rRatio2C(uint16_t ratio) {
+  // A simple linear conversion.
+  const float R0 = 100.0f;
+  const float Rref = 430.0f;
+  const float alphaPT = 0.003850f;
+  const float ADCmax = (1u << 15) - 1.0f;
+  const float rscale = Rref / ADCmax;
+  // Measured temperature in boiling water 101.08°C with factor a = 1 and b = 0. Rref and MAX at about 22±2°C.
+  // Measured temperature in ice/water bath 0.76°C with factor a = 1 and b = 0. Rref and MAX at about 22±2°C.
+  //const float a = 1.0f / (alphaPT * R0);
+  const float a = (100.0f/101.08f) / (alphaPT * R0);
+  //const float b = 0.0f;  // 101.08
+  const float b = -0.76f;  // 100.32 > 101.08
+
+  return filterRing( ((ratio * rscale) - R0) * a + b );
+}
+
+// General purpose *********************************************************************************************
+#define RINGLENGTH 250
+float filterRing( float newVal ) {
+  static float ring[RINGLENGTH] = { 0.0 };
+  static uint8_t ringIndex = 0;
+  static bool ringFull = false;
+
+  if ( ringIndex == RINGLENGTH ) { ringFull = true; ringIndex = 0; }
+  ring[ringIndex] = newVal;
+  uint8_t loopEnd = (ringFull) ? RINGLENGTH : ringIndex + 1;
+  float ringSum = 0.0f;
+  for (uint8_t i = 0;  i < loopEnd; i++) ringSum += ring[i];
+  ringIndex++;
+  return ringSum / loopEnd;
+}

firmware/libraries/Adafruit_BusIO/examples/spi_registers/spi_registers.ino

@@ -0,0 +1,34 @@
+#include <Adafruit_BusIO_Register.h>
+#include <Adafruit_SPIDevice.h>
+
+#define SPIDEVICE_CS 10
+Adafruit_SPIDevice spi_dev = Adafruit_SPIDevice(SPIDEVICE_CS);
+
+void setup() {
+  while (!Serial) { delay(10); }
+  Serial.begin(115200);
+  Serial.println("SPI device register test");
+
+  if (!spi_dev.begin()) {
+    Serial.println("Could not initialize SPI device");
+    while (1);
+  }
+
+  Adafruit_BusIO_Register id_reg = Adafruit_BusIO_Register(&spi_dev, 0x0F, ADDRBIT8_HIGH_TOREAD);
+  uint8_t id = 0;
+  id_reg.read(&id);
+  Serial.print("ID register = 0x"); Serial.println(id, HEX);
+
+  Adafruit_BusIO_Register thresh_reg = Adafruit_BusIO_Register(&spi_dev, 0x0C, ADDRBIT8_HIGH_TOREAD, 2, LSBFIRST);
+  uint16_t thresh = 0;
+  thresh_reg.read(&thresh);
+  Serial.print("Initial threshold register = 0x"); Serial.println(thresh, HEX);
+
+  thresh_reg.write(~thresh);
+
+  Serial.print("Post threshold register = 0x"); Serial.println(thresh_reg.read(), HEX);
+}
+
+void loop() {
+  
+}

firmware/libraries/Adafruit_BusIO/library.properties

@@ -0,0 +1,9 @@
+name=Adafruit BusIO
+version=1.14.1
+author=Adafruit
+maintainer=Adafruit <info@adafruit.com>
+sentence=This is a library for abstracting away UART, I2C and SPI interfacing
+paragraph=This is a library for abstracting away UART, I2C and SPI interfacing
+category=Signal Input/Output
+url=https://github.com/adafruit/Adafruit_BusIO
+architectures=*

firmware/libraries/Adafruit_Unified_Sensor/Adafruit_Sensor.cpp

@@ -0,0 +1,81 @@
+#include "Adafruit_Sensor.h"
+
+/**************************************************************************/
+/*!
+    @brief  Prints sensor information to serial console
+*/
+/**************************************************************************/
+void Adafruit_Sensor::printSensorDetails(void) {
+  sensor_t sensor;
+  getSensor(&sensor);
+  Serial.println(F("------------------------------------"));
+  Serial.print(F("Sensor:       "));
+  Serial.println(sensor.name);
+  Serial.print(F("Type:         "));
+  switch ((sensors_type_t)sensor.type) {
+  case SENSOR_TYPE_ACCELEROMETER:
+    Serial.print(F("Acceleration (m/s2)"));
+    break;
+  case SENSOR_TYPE_MAGNETIC_FIELD:
+    Serial.print(F("Magnetic (uT)"));
+    break;
+  case SENSOR_TYPE_ORIENTATION:
+    Serial.print(F("Orientation (degrees)"));
+    break;
+  case SENSOR_TYPE_GYROSCOPE:
+    Serial.print(F("Gyroscopic (rad/s)"));
+    break;
+  case SENSOR_TYPE_LIGHT:
+    Serial.print(F("Light (lux)"));
+    break;
+  case SENSOR_TYPE_PRESSURE:
+    Serial.print(F("Pressure (hPa)"));
+    break;
+  case SENSOR_TYPE_PROXIMITY:
+    Serial.print(F("Distance (cm)"));
+    break;
+  case SENSOR_TYPE_GRAVITY:
+    Serial.print(F("Gravity (m/s2)"));
+    break;
+  case SENSOR_TYPE_LINEAR_ACCELERATION:
+    Serial.print(F("Linear Acceleration (m/s2)"));
+    break;
+  case SENSOR_TYPE_ROTATION_VECTOR:
+    Serial.print(F("Rotation vector"));
+    break;
+  case SENSOR_TYPE_RELATIVE_HUMIDITY:
+    Serial.print(F("Relative Humidity (%)"));
+    break;
+  case SENSOR_TYPE_AMBIENT_TEMPERATURE:
+    Serial.print(F("Ambient Temp (C)"));
+    break;
+  case SENSOR_TYPE_OBJECT_TEMPERATURE:
+    Serial.print(F("Object Temp (C)"));
+    break;
+  case SENSOR_TYPE_VOLTAGE:
+    Serial.print(F("Voltage (V)"));
+    break;
+  case SENSOR_TYPE_CURRENT:
+    Serial.print(F("Current (mA)"));
+    break;
+  case SENSOR_TYPE_COLOR:
+    Serial.print(F("Color (RGBA)"));
+    break;
+  case SENSOR_TYPE_TVOC:
+    Serial.print(F("Total Volatile Organic Compounds (ppb)"));
+    break;
+  }
+
+  Serial.println();
+  Serial.print(F("Driver Ver:   "));
+  Serial.println(sensor.version);
+  Serial.print(F("Unique ID:    "));
+  Serial.println(sensor.sensor_id);
+  Serial.print(F("Min Value:    "));
+  Serial.println(sensor.min_value);
+  Serial.print(F("Max Value:    "));
+  Serial.println(sensor.max_value);
+  Serial.print(F("Resolution:   "));
+  Serial.println(sensor.resolution);
+  Serial.println(F("------------------------------------\n"));
+}

firmware/libraries/Adafruit_Unified_Sensor/Adafruit_Sensor.h

@@ -1,155 +1,189 @@
 /*
-* Copyright (C) 2008 The Android Open Source Project
-*
-* Licensed under the Apache License, Version 2.0 (the "License");
-* you may not use this file except in compliance with the License.
-* You may obtain a copy of the License at
-*
-* http://www.apache.org/licenses/LICENSE-2.0
-*
-* Unless required by applicable law or agreed to in writing, software< /span>
-* distributed under the License is distributed on an "AS IS" BASIS,
-* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-* See the License for the specific language governing permissions and
-* limitations under the License.
-*/
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software< /span>
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 
 /* Update by K. Townsend (Adafruit Industries) for lighter typedefs, and
  * extended sensor support to include color, voltage and current */
- 
+
 #ifndef _ADAFRUIT_SENSOR_H
 #define _ADAFRUIT_SENSOR_H
 
 #ifndef ARDUINO
- #include <stdint.h>
+#include <stdint.h>
 #elif ARDUINO >= 100
- #include "Arduino.h"
- #include "Print.h"
+#include "Arduino.h"
+#include "Print.h"
 #else
- #include "WProgram.h"
+#include "WProgram.h"
 #endif
 
-/* Intentionally modeled after sensors.h in the Android API:
- * https://github.com/android/platform_hardware_libhardware/blob/master/include/hardware/sensors.h */
-
 /* Constants */
-#define SENSORS_GRAVITY_EARTH             (9.80665F)              /**< Earth's gravity in m/s^2 */
-#define SENSORS_GRAVITY_MOON              (1.6F)                  /**< The moon's gravity in m/s^2 */
-#define SENSORS_GRAVITY_SUN               (275.0F)                /**< The sun's gravity in m/s^2 */
-#define SENSORS_GRAVITY_STANDARD          (SENSORS_GRAVITY_EARTH)
-#define SENSORS_MAGFIELD_EARTH_MAX        (60.0F)                 /**< Maximum magnetic field on Earth's surface */
-#define SENSORS_MAGFIELD_EARTH_MIN        (30.0F)                 /**< Minimum magnetic field on Earth's surface */
-#define SENSORS_PRESSURE_SEALEVELHPA      (1013.25F)              /**< Average sea level pressure is 1013.25 hPa */
-#define SENSORS_DPS_TO_RADS               (0.017453293F)          /**< Degrees/s to rad/s multiplier */
-#define SENSORS_GAUSS_TO_MICROTESLA       (100)                   /**< Gauss to micro-Tesla multiplier */
+#define SENSORS_GRAVITY_EARTH (9.80665F) /**< Earth's gravity in m/s^2 */
+#define SENSORS_GRAVITY_MOON (1.6F)      /**< The moon's gravity in m/s^2 */
+#define SENSORS_GRAVITY_SUN (275.0F)     /**< The sun's gravity in m/s^2 */
+#define SENSORS_GRAVITY_STANDARD (SENSORS_GRAVITY_EARTH)
+#define SENSORS_MAGFIELD_EARTH_MAX                                             \
+  (60.0F) /**< Maximum magnetic field on Earth's surface */
+#define SENSORS_MAGFIELD_EARTH_MIN                                             \
+  (30.0F) /**< Minimum magnetic field on Earth's surface */
+#define SENSORS_PRESSURE_SEALEVELHPA                                           \
+  (1013.25F) /**< Average sea level pressure is 1013.25 hPa */
+#define SENSORS_DPS_TO_RADS                                                    \
+  (0.017453293F) /**< Degrees/s to rad/s multiplier                            \
+                  */
+#define SENSORS_RADS_TO_DPS                                                    \
+  (57.29577793F) /**< Rad/s to degrees/s  multiplier */
+#define SENSORS_GAUSS_TO_MICROTESLA                                            \
+  (100) /**< Gauss to micro-Tesla multiplier */
 
 /** Sensor types */
-typedef enum
-{
-  SENSOR_TYPE_ACCELEROMETER         = (1),   /**< Gravity + linear acceleration */
-  SENSOR_TYPE_MAGNETIC_FIELD        = (2),
-  SENSOR_TYPE_ORIENTATION           = (3),
-  SENSOR_TYPE_GYROSCOPE             = (4),
-  SENSOR_TYPE_LIGHT                 = (5),
-  SENSOR_TYPE_PRESSURE              = (6),
-  SENSOR_TYPE_PROXIMITY             = (8),
-  SENSOR_TYPE_GRAVITY               = (9),
-  SENSOR_TYPE_LINEAR_ACCELERATION   = (10),  /**< Acceleration not including gravity */
-  SENSOR_TYPE_ROTATION_VECTOR       = (11),
-  SENSOR_TYPE_RELATIVE_HUMIDITY     = (12),
-  SENSOR_TYPE_AMBIENT_TEMPERATURE   = (13),
-  SENSOR_TYPE_VOLTAGE               = (15),
-  SENSOR_TYPE_CURRENT               = (16),
-  SENSOR_TYPE_COLOR                 = (17)
+typedef enum {
+  SENSOR_TYPE_ACCELEROMETER = (1), /**< Gravity + linear acceleration */
+  SENSOR_TYPE_MAGNETIC_FIELD = (2),
+  SENSOR_TYPE_ORIENTATION = (3),
+  SENSOR_TYPE_GYROSCOPE = (4),
+  SENSOR_TYPE_LIGHT = (5),
+  SENSOR_TYPE_PRESSURE = (6),
+  SENSOR_TYPE_PROXIMITY = (8),
+  SENSOR_TYPE_GRAVITY = (9),
+  SENSOR_TYPE_LINEAR_ACCELERATION =
+      (10), /**< Acceleration not including gravity */
+  SENSOR_TYPE_ROTATION_VECTOR = (11),
+  SENSOR_TYPE_RELATIVE_HUMIDITY = (12),
+  SENSOR_TYPE_AMBIENT_TEMPERATURE = (13),
+  SENSOR_TYPE_OBJECT_TEMPERATURE = (14),
+  SENSOR_TYPE_VOLTAGE = (15),
+  SENSOR_TYPE_CURRENT = (16),
+  SENSOR_TYPE_COLOR = (17),
+  SENSOR_TYPE_TVOC = (18)
 } sensors_type_t;
 
 /** struct sensors_vec_s is used to return a vector in a common format. */
 typedef struct {
-    union {
-        float v[3];
-        struct {
-            float x;
-            float y;
-            float z;
-        };
-        /* Orientation sensors */
-        struct {
-            float roll;    /**< Rotation around the longitudinal axis (the plane body, 'X axis'). Roll is positive and increasing when moving downward. -90°<=roll<=90° */
-            float pitch;   /**< Rotation around the lateral axis (the wing span, 'Y axis'). Pitch is positive and increasing when moving upwards. -180°<=pitch<=180°) */
-            float heading; /**< Angle between the longitudinal axis (the plane body) and magnetic north, measured clockwise when viewing from the top of the device. 0-359° */
-        };
-    };
-    int8_t status;
-    uint8_t reserved[3];
+  union {
+    float v[3]; ///< 3D vector elements
+    struct {
+      float x; ///< X component of vector
+      float y; ///< Y component of vector
+      float z; ///< Z component of vector
+    };         ///< Struct for holding XYZ component
+    /* Orientation sensors */
+    struct {
+      float roll; /**< Rotation around the longitudinal axis (the plane body, 'X
+                     axis'). Roll is positive and increasing when moving
+                     downward. -90 degrees <= roll <= 90 degrees */
+      float pitch;   /**< Rotation around the lateral axis (the wing span, 'Y
+                        axis'). Pitch is positive and increasing when moving
+                        upwards. -180 degrees <= pitch <= 180 degrees) */
+      float heading; /**< Angle between the longitudinal axis (the plane body)
+                        and magnetic north, measured clockwise when viewing from
+                        the top of the device. 0-359 degrees */
+    };               ///< Struct for holding roll/pitch/heading
+  };                 ///< Union that can hold 3D vector array, XYZ components or
+                     ///< roll/pitch/heading
+  int8_t status;     ///< Status byte
+  uint8_t reserved[3]; ///< Reserved
 } sensors_vec_t;
 
 /** struct sensors_color_s is used to return color data in a common format. */
 typedef struct {
-    union {
-        float c[3];
-        /* RGB color space */
-        struct {
-            float r;       /**< Red component */
-            float g;       /**< Green component */
-            float b;       /**< Blue component */
-        };
-    };
-    uint32_t rgba;         /**< 24-bit RGBA value */
+  union {
+    float c[3]; ///< Raw 3-element data
+    /* RGB color space */
+    struct {
+      float r;   /**< Red component */
+      float g;   /**< Green component */
+      float b;   /**< Blue component */
+    };           ///< RGB data in floating point notation
+  };             ///< Union of various ways to describe RGB colorspace
+  uint32_t rgba; /**< 24-bit RGBA value */
 } sensors_color_t;
 
 /* Sensor event (36 bytes) */
-/** struct sensor_event_s is used to provide a single sensor event in a common format. */
-typedef struct
-{
-    int32_t version;                          /**< must be sizeof(struct sensors_event_t) */
-    int32_t sensor_id;                        /**< unique sensor identifier */
-    int32_t type;                             /**< sensor type */
-    int32_t reserved0;                        /**< reserved */
-    int32_t timestamp;                        /**< time is in milliseconds */
-    union
-    {
-        float           data[4];
-        sensors_vec_t   acceleration;         /**< acceleration values are in meter per second per second (m/s^2) */
-        sensors_vec_t   magnetic;             /**< magnetic vector values are in micro-Tesla (uT) */
-        sensors_vec_t   orientation;          /**< orientation values are in degrees */
-        sensors_vec_t   gyro;                 /**< gyroscope values are in rad/s */
-        float           temperature;          /**< temperature is in degrees centigrade (Celsius) */
-        float           distance;             /**< distance in centimeters */
-        float           light;                /**< light in SI lux units */
-        float           pressure;             /**< pressure in hectopascal (hPa) */
-        float           relative_humidity;    /**< relative humidity in percent */
-        float           current;              /**< current in milliamps (mA) */
-        float           voltage;              /**< voltage in volts (V) */
-        sensors_color_t color;                /**< color in RGB component values */
-    };
+/** struct sensor_event_s is used to provide a single sensor event in a common
+ * format. */
+typedef struct {
+  int32_t version;   /**< must be sizeof(struct sensors_event_t) */
+  int32_t sensor_id; /**< unique sensor identifier */
+  int32_t type;      /**< sensor type */
+  int32_t reserved0; /**< reserved */
+  int32_t timestamp; /**< time is in milliseconds */
+  union {
+    float data[4];              ///< Raw data
+    sensors_vec_t acceleration; /**< acceleration values are in meter per second
+                                   per second (m/s^2) */
+    sensors_vec_t
+        magnetic; /**< magnetic vector values are in micro-Tesla (uT) */
+    sensors_vec_t orientation; /**< orientation values are in degrees */
+    sensors_vec_t gyro;        /**< gyroscope values are in rad/s */
+    float temperature; /**< temperature is in degrees centigrade (Celsius) */
+    float distance;    /**< distance in centimeters */
+    float light;       /**< light in SI lux units */
+    float pressure;    /**< pressure in hectopascal (hPa) */
+    float relative_humidity; /**< relative humidity in percent */
+    float current;           /**< current in milliamps (mA) */
+    float voltage;           /**< voltage in volts (V) */
+    float tvoc;              /**< Total Volatile Organic Compounds, in ppb */
+    sensors_color_t color;   /**< color in RGB component values */
+  };                         ///< Union for the wide ranges of data we can carry
 } sensors_event_t;
 
 /* Sensor details (40 bytes) */
-/** struct sensor_s is used to describe basic information about a specific sensor. */
-typedef struct
-{
-    char     name[12];                        /**< sensor name */
-    int32_t  version;                         /**< version of the hardware + driver */
-    int32_t  sensor_id;                       /**< unique sensor identifier */
-    int32_t  type;                            /**< this sensor's type (ex. SENSOR_TYPE_LIGHT) */
-    float    max_value;                       /**< maximum value of this sensor's value in SI units */
-    float    min_value;                       /**< minimum value of this sensor's value in SI units */
-    float    resolution;                      /**< smallest difference between two values reported by this sensor */
-    int32_t  min_delay;                       /**< min delay in microseconds between events. zero = not a constant rate */
+/** struct sensor_s is used to describe basic information about a specific
+ * sensor. */
+typedef struct {
+  char name[12];     /**< sensor name */
+  int32_t version;   /**< version of the hardware + driver */
+  int32_t sensor_id; /**< unique sensor identifier */
+  int32_t type;      /**< this sensor's type (ex. SENSOR_TYPE_LIGHT) */
+  float max_value;   /**< maximum value of this sensor's value in SI units */
+  float min_value;   /**< minimum value of this sensor's value in SI units */
+  float resolution; /**< smallest difference between two values reported by this
+                       sensor */
+  int32_t min_delay; /**< min delay in microseconds between events. zero = not a
+                        constant rate */
 } sensor_t;
 
+/** @brief Common sensor interface to unify various sensors.
+ * Intentionally modeled after sensors.h in the Android API:
+ * https://github.com/android/platform_hardware_libhardware/blob/master/include/hardware/sensors.h
+ */
 class Adafruit_Sensor {
- public:
+public:
   // Constructor(s)
   Adafruit_Sensor() {}
   virtual ~Adafruit_Sensor() {}
 
   // These must be defined by the subclass
-  virtual void enableAutoRange(bool enabled) { (void)enabled; /* suppress unused warning */ };
-  virtual bool getEvent(sensors_event_t*) = 0;
-  virtual void getSensor(sensor_t*) = 0;
-  
- private:
+
+  /*! @brief Whether we should automatically change the range (if possible) for
+     higher precision
+      @param enabled True if we will try to autorange */
+  virtual void enableAutoRange(bool enabled) {
+    (void)enabled; /* suppress unused warning */
+  };
+
+  /*! @brief Get the latest sensor event
+      @returns True if able to fetch an event */
+  virtual bool getEvent(sensors_event_t *) = 0;
+  /*! @brief Get info about the sensor itself */
+  virtual void getSensor(sensor_t *) = 0;
+
+  void printSensorDetails(void);
+
+private:
   bool _autoRange;
 };
 

firmware/libraries/Adafruit_Unified_Sensor/LICENSE.txt

@@ -0,0 +1,202 @@
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firmware/libraries/Adafruit_Unified_Sensor/README.md

@@ -52,11 +52,11 @@ The following drivers are based on the Adafruit Unified Sensor Driver:
 
 Any driver that supports the Adafruit unified sensor abstraction layer will implement the Adafruit\_Sensor base class.  There are two main typedefs and one enum defined in Adafruit_Sensor.h that are used to 'abstract' away the sensor details and values:
 
-**Sensor Types (sensors\_type\_t)**
+## Sensor Types (`sensors_type_t`)
 
 These pre-defined sensor types are used to properly handle the two related typedefs below, and allows us determine what types of units the sensor uses, etc.
 
-```
+```c++
 /** Sensor types */
 typedef enum
 {
@@ -78,11 +78,11 @@ typedef enum
 } sensors_type_t;
 ```
 
-**Sensor Details (sensor\_t)**
+## Sensor Details (`sensor_t`)
 
 This typedef describes the specific capabilities of this sensor, and allows us to know what sensor we are using beneath the abstraction layer.
 
-```
+```c++
 /* Sensor details (40 bytes) */
 /** struct sensor_s is used to describe basic information about a specific sensor. */
 typedef struct
@@ -109,11 +109,11 @@ The individual fields are intended to be used as follows:
 - **resolution**: The smallest difference between two values that this sensor can report (in the appropriate SI unit)
 - **min\_delay**: The minimum delay in microseconds between two sensor events, or '0' if there is no constant sensor rate
 
-**Sensor Data/Events (sensors\_event\_t)**
+## Sensor Data/Events (`sensors_event_t`)
 
 This typedef is used to return sensor data from any sensor supported by the abstraction layer, using standard SI units and scales.
 
-```
+```c++
 /* Sensor event (36 bytes) */
 /** struct sensor_event_s is used to provide a single sensor event in a common format. */
 typedef struct
@@ -149,21 +149,21 @@ It includes the following fields:
 - **timestamp**: time in milliseconds when the sensor value was read
 - **data[4]**: An array of four 32-bit values that allows us to encapsulate any type of sensor data via a simple union (further described below)
 
-**Required Functions**
+## Required Functions
 
 In addition to the two standard types and the sensor type enum, all drivers based on Adafruit_Sensor must also implement the following two functions:
 
-```
+```c++
 bool getEvent(sensors_event_t*);
 ```
 Calling this function will populate the supplied sensors\_event\_t reference with the latest available sensor data.  You should call this function as often as you want to update your data.
 
-```
+```c++
 void getSensor(sensor_t*);
 ```
 Calling this function will provide some basic information about the sensor (the sensor name, driver version, min and max values, etc.
 
-**Standardised SI values for sensors\_event\_t**
+## Standardised SI values for `sensors_event_t`
 
 A key part of the abstraction layer is the standardisation of values on SI units of a particular scale, which is accomplished via the data[4] union in sensors\_event\_t above.  This 16 byte union includes fields for each main sensor type, and uses the following SI units and scales:
 
@@ -188,7 +188,7 @@ Every compliant sensor can now be read using a single, well-known 'type' (sensor
 
 An example of reading the [TSL2561](https://github.com/adafruit/Adafruit_TSL2561) light sensor can be seen below:
 
-```
+```c++
  Adafruit_TSL2561 tsl = Adafruit_TSL2561(TSL2561_ADDR_FLOAT, 12345);
  ...
  /* Get a new sensor event */ 
@@ -210,7 +210,7 @@ An example of reading the [TSL2561](https://github.com/adafruit/Adafruit_TSL2561
 
 Similarly, we can get the basic technical capabilities of this sensor with the following code:
 
-```
+```c++
  sensor_t sensor;
  
  sensor_t sensor;

firmware/libraries/Adafruit_Unified_Sensor/examples/sensortest/sensortest.ino

@@ -0,0 +1,153 @@
+#include <Wire.h>
+#include <Adafruit_Sensor.h>
+#include <Adafruit_ADXL343.h>
+
+/* Assign a unique ID to this sensor at the same time */
+/* Uncomment following line for default Wire bus      */
+Adafruit_ADXL343 accel = Adafruit_ADXL343(12345);
+
+/* NeoTrellis M4, etc.                    */
+/* Uncomment following line for Wire1 bus */
+//Adafruit_ADXL343 accel = Adafruit_ADXL343(12345, &Wire1);
+
+void displaySensorDetails(void)
+{
+  sensor_t sensor;
+  accel.getSensor(&sensor);
+  Serial.println("------------------------------------");
+  Serial.print  ("Sensor:       "); Serial.println(sensor.name);
+  Serial.print  ("Driver Ver:   "); Serial.println(sensor.version);
+  Serial.print  ("Unique ID:    "); Serial.println(sensor.sensor_id);
+  Serial.print  ("Max Value:    "); Serial.print(sensor.max_value); Serial.println(" m/s^2");
+  Serial.print  ("Min Value:    "); Serial.print(sensor.min_value); Serial.println(" m/s^2");
+  Serial.print  ("Resolution:   "); Serial.print(sensor.resolution); Serial.println(" m/s^2");
+  Serial.println("------------------------------------");
+  Serial.println("");
+  delay(500);
+}
+
+void displayDataRate(void)
+{
+  Serial.print  ("Data Rate:    ");
+
+  switch(accel.getDataRate())
+  {
+    case ADXL343_DATARATE_3200_HZ:
+      Serial.print  ("3200 ");
+      break;
+    case ADXL343_DATARATE_1600_HZ:
+      Serial.print  ("1600 ");
+      break;
+    case ADXL343_DATARATE_800_HZ:
+      Serial.print  ("800 ");
+      break;
+    case ADXL343_DATARATE_400_HZ:
+      Serial.print  ("400 ");
+      break;
+    case ADXL343_DATARATE_200_HZ:
+      Serial.print  ("200 ");
+      break;
+    case ADXL343_DATARATE_100_HZ:
+      Serial.print  ("100 ");
+      break;
+    case ADXL343_DATARATE_50_HZ:
+      Serial.print  ("50 ");
+      break;
+    case ADXL343_DATARATE_25_HZ:
+      Serial.print  ("25 ");
+      break;
+    case ADXL343_DATARATE_12_5_HZ:
+      Serial.print  ("12.5 ");
+      break;
+    case ADXL343_DATARATE_6_25HZ:
+      Serial.print  ("6.25 ");
+      break;
+    case ADXL343_DATARATE_3_13_HZ:
+      Serial.print  ("3.13 ");
+      break;
+    case ADXL343_DATARATE_1_56_HZ:
+      Serial.print  ("1.56 ");
+      break;
+    case ADXL343_DATARATE_0_78_HZ:
+      Serial.print  ("0.78 ");
+      break;
+    case ADXL343_DATARATE_0_39_HZ:
+      Serial.print  ("0.39 ");
+      break;
+    case ADXL343_DATARATE_0_20_HZ:
+      Serial.print  ("0.20 ");
+      break;
+    case ADXL343_DATARATE_0_10_HZ:
+      Serial.print  ("0.10 ");
+      break;
+    default:
+      Serial.print  ("???? ");
+      break;
+  }
+  Serial.println(" Hz");
+}
+
+void displayRange(void)
+{
+  Serial.print  ("Range:         +/- ");
+
+  switch(accel.getRange())
+  {
+    case ADXL343_RANGE_16_G:
+      Serial.print  ("16 ");
+      break;
+    case ADXL343_RANGE_8_G:
+      Serial.print  ("8 ");
+      break;
+    case ADXL343_RANGE_4_G:
+      Serial.print  ("4 ");
+      break;
+    case ADXL343_RANGE_2_G:
+      Serial.print  ("2 ");
+      break;
+    default:
+      Serial.print  ("?? ");
+      break;
+  }
+  Serial.println(" g");
+}
+
+void setup(void)
+{
+  Serial.begin(9600);
+  while (!Serial);
+  Serial.println("Accelerometer Test"); Serial.println("");
+
+  /* Initialise the sensor */
+  if(!accel.begin())
+  {
+    /* There was a problem detecting the ADXL343 ... check your connections */
+    Serial.println("Ooops, no ADXL343 detected ... Check your wiring!");
+    while(1);
+  }
+
+  /* Set the range to whatever is appropriate for your project */
+  accel.setRange(ADXL343_RANGE_16_G);
+  // accel.setRange(ADXL343_RANGE_8_G);
+  // accel.setRange(ADXL343_RANGE_4_G);
+  // accel.setRange(ADXL343_RANGE_2_G);
+
+  /* Display some basic information on this sensor */
+  displaySensorDetails();
+  displayDataRate();
+  displayRange();
+  Serial.println("");
+}
+
+void loop(void)
+{
+  /* Get a new sensor event */
+  sensors_event_t event;
+  accel.getEvent(&event);
+
+  /* Display the results (acceleration is measured in m/s^2) */
+  Serial.print("X: "); Serial.print(event.acceleration.x); Serial.print("  ");
+  Serial.print("Y: "); Serial.print(event.acceleration.y); Serial.print("  ");
+  Serial.print("Z: "); Serial.print(event.acceleration.z); Serial.print("  ");Serial.println("m/s^2 ");
+  delay(500);
+}

firmware/libraries/Adafruit_Unified_Sensor/library.properties

@@ -1,5 +1,5 @@
 name=Adafruit Unified Sensor
-version=1.0.3
+version=1.1.6
 author=Adafruit <info@adafruit.com>
 maintainer=Adafruit <info@adafruit.com>
 sentence=Required for all Adafruit Unified Sensor based libraries.
@@ -8,3 +8,4 @@ category=Sensors
 url=https://github.com/adafruit/Adafruit_Sensor
 architectures=*
 includes=Adafruit_Sensor.h
+

firmware/libraries/ESP8266Influxdb/ESP8266Influxdb 2.cpp

@@ -0,0 +1,176 @@
+#include "Arduino.h"
+#include "ESP8266Influxdb.h"
+#include <ESP8266WiFi.h>
+
+#define DEBUG_PRINT // comment this line to disable debug print
+
+#ifndef DEBUG_PRINT
+#define DEBUG_PRINT(a)
+#else
+#define DEBUG_PRINT(a) (Serial.println(String(F("[Debug]: "))+(a)))
+#define _DEBUG
+#endif
+
+Influxdb::Influxdb(const char *host, uint16_t port) : WiFiClient() {
+        _port = port;
+        _host = host;
+}
+
+DB_RESPONSE Influxdb::opendb(String db, String user, String password) {
+        _db = "db=" + db + "&u=" + user + "&p=" + password;
+}
+
+DB_RESPONSE Influxdb::opendb(String db) {
+        _db = "db=" + db;
+
+}
+
+DB_RESPONSE Influxdb::write(FIELD data) {
+        return write(data.postString());
+}
+
+DB_RESPONSE Influxdb::write(String data) {
+        if (!connect(_host, _port)) {
+                DEBUG_PRINT("connection failed");
+                _response = DB_CONNECT_FAILED;
+                return _response;
+        }
+        String postHead = "POST /write?" + _db + " HTTP/1.1\r\n";
+        postHead += "Host: " + String(_host) + ":" + String(_port) + "\r\n";
+        // postHead += "Content-Type: application/x-www-form-urlencoded\r\n";
+        postHead += "Content-Length: " + String(data.length()) + "\r\n\r\n";
+
+        DEBUG_PRINT("Writing data to " + String(_host) + ":" + String(_port));
+        print(postHead + data);
+        DEBUG_PRINT(postHead + data);
+
+        uint8_t t = 0;
+        // Check the reply whether writing is success or not
+        while (!available() && t < 200) {
+                delay(10);
+                t++;
+        }
+        if (t==200) {_response = DB_ERROR; return DB_ERROR; } // Return error if time out.
+
+#if !defined _DEBUG
+        if (available()) {
+                _response = (findUntil("204", "\r")) ? DB_SUCCESS : DB_ERROR;
+                return _response;
+        }
+#else
+        _response=DB_ERROR;
+        while (available()) {
+                String line = readStringUntil('\n');
+                if (line.substring(9,12)=="204")
+                        _response = DB_SUCCESS;
+                DEBUG_PRINT("(Responsed): " + line);
+        }
+        return _response;
+#endif
+        return DB_ERROR;
+}
+
+DB_RESPONSE Influxdb::query(String sql) {
+
+        if (!connect(_host, _port)) {
+                DEBUG_PRINT("connection failed");
+                _response = DB_CONNECT_FAILED;
+                return _response;
+        }
+
+        String url = "/query?";
+#if defined _DEBUG
+        url += "pretty=true&";
+#endif
+        url += _db;
+        url += "&q=" + URLEncode(sql);
+        DEBUG_PRINT("Requesting URL: ");
+        DEBUG_PRINT(url);
+
+        // This will send the request to the server
+        print(String("GET ") + url + " HTTP/1.1\r\n" + "Host: " + _host +
+              ":" + _port + "\r\n" + "Connection: close\r\n\r\n");
+
+        // Read all the lines of the reply from server and print them to Serial
+        uint8_t t = 0;
+        while (!available() && t < 200) {
+                delay(10);
+                t++;
+        }
+        if (t==200) {_response = DB_ERROR; return DB_ERROR; }  // Return error if time out.
+
+        DEBUG_PRINT("Receiving....");
+        uint8_t i=0;
+        String line = readStringUntil('\n');
+        DEBUG_PRINT("[HEAD] " + line);
+
+        if (line.substring(9,12) == "200") {
+                while (available()) {
+                        line = readStringUntil('\n');
+                        DEBUG_PRINT("(HEAD) " + line);
+                        if (i < 6 ) i++; else return _response;
+                }
+                _response = DB_SUCCESS;
+        }
+        else{
+                _response = DB_ERROR;
+#if defined _DEBUG
+                while (available()) {
+                        line = readStringUntil('\n');
+                        DEBUG_PRINT("[HEAD] " + line);
+                }
+#endif
+        }
+
+        return _response;
+}
+
+DB_RESPONSE Influxdb::response() {
+        return _response;
+}
+
+/* -----------------------------------------------*/
+//        Field object
+/* -----------------------------------------------*/
+FIELD::FIELD(String m) {
+        measurement = m;
+}
+
+void FIELD::empty() {
+        _data = "";
+        _tag = "";
+}
+
+void FIELD::addTag(String key, String value) {
+        _tag += "," + key + "=" + value;
+}
+
+void FIELD::addField(String key, float value) {
+        _data = (_data == "") ? (" ") : (_data += ",");
+        _data += key + "=" + String(value);
+}
+
+String FIELD::postString() {
+        //  uint32_t utc = 1448114561 + millis() /1000;
+        return measurement + _tag + _data;
+}
+
+// URL Encode with Arduino String object
+String URLEncode(String msg) {
+        const char *hex = "0123456789abcdef";
+        String encodedMsg = "";
+
+        uint16_t i;
+        for (i = 0; i < msg.length(); i++) {
+                if (('a' <= msg.charAt(i) && msg.charAt(i) <= 'z') ||
+                    ('A' <= msg.charAt(i) && msg.charAt(i) <= 'Z') ||
+                    ('0' <= msg.charAt(i) && msg.charAt(i) <= '9')) {
+                        encodedMsg += msg.charAt(i);
+                } else {
+                        encodedMsg += '%';
+                        encodedMsg += hex[msg.charAt(i) >> 4];
+                        encodedMsg += hex[msg.charAt(i) & 15];
+                }
+        }
+        return encodedMsg;
+}

firmware/libraries/ESP8266Influxdb/ESP8266Influxdb 2.h

@@ -0,0 +1,72 @@
+/* Influxdb library
+
+   MIT license
+   Written by HW Wong
+ */
+
+#ifndef INFLUXDB_H
+#define INFLUXDB_H
+#include "Arduino.h"
+#include <ESP8266WiFi.h>
+
+enum DB_RESPONSE {DB_SUCCESS, DB_ERROR, DB_CONNECT_FAILED};
+
+// Url encode function
+String URLEncode(String msg);
+
+class FIELD
+{
+public:
+        FIELD(String m);
+
+        String measurement;
+
+        void addField(String key, float value);
+        void addTag(String key, String value);
+        void empty();
+        String postString();
+
+private:
+        String _data;
+        String _tag;
+
+};
+
+class Influxdb : private WiFiClient
+{
+public:
+        Influxdb(const char* host, uint16_t port);
+
+        DB_RESPONSE opendb(String db);
+        DB_RESPONSE opendb(String db, String user, String password);
+        DB_RESPONSE write(FIELD data);
+        DB_RESPONSE write(String data);
+        DB_RESPONSE query(String sql);
+        //uint8_t createDatabase(char *dbname);
+        DB_RESPONSE response();
+
+        using WiFiClient::available;
+        using WiFiClient::read;
+        using WiFiClient::flush;
+        using WiFiClient::find;
+        using WiFiClient::findUntil;
+        using WiFiClient::peek;
+        using WiFiClient::readBytes;
+        using WiFiClient::readBytesUntil;
+        using WiFiClient::readString;
+        using WiFiClient::readStringUntil;
+        using WiFiClient::parseInt;
+        using WiFiClient::setTimeout;
+
+private:
+        uint16_t _port;
+        const char* _host;
+        String _db;
+        DB_RESPONSE _response;
+
+};
+
+
+
+
+#endif

firmware/libraries/ESP8266Influxdb/README 2.md

@@ -0,0 +1 @@
+# ESP8266Influxdb

firmware/libraries/ESP8266Influxdb/keywords 2.txt

@@ -0,0 +1,24 @@
+##################################################
+# Syntax Coloring Map For ESP8266 Influxdb library
+##################################################
+
+##################################################
+# Datatypes (KEYWORD1)
+##################################################
+
+Influxdb	   KEYWORD1
+FIELD		     KEYWORD1
+DB_RESPOND 	 KEYWORD1
+
+##################################################
+# Methods and Functions (KEYWORD2)
+##################################################
+
+addField 	  KEYWORD2
+addTag	 	  KEYWORD2
+empty	 	    KEYWORD2
+opendb	 	  KEYWORD2
+write	 	    KEYWORD2
+query	 	    KEYWORD2
+postString	KEYWORD2
+response    KEYWORD2

firmware/libraries/ESP8266_Influxdb/CHANGELOG.md

@@ -0,0 +1,148 @@
+# Changelog
+##  3.12.1 [2022-08-29]
+### Fixes
+- [193](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/193) - Automatically adjusting point timestamp  according to the setting of write precision. 
+
+## 3.12.0 [2022-03-21]
+### Features
+- [185](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/185) - Added diagnostic server connection state getter `bool InfluxDBClient::isConnected()`
+
+## 3.11.0 [2022-02-18]
+### Features
+ - [174](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/174),[181](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/181) - All API methods with a string param allow specifying string by all basic types:
+  - Arduino `String` class
+  - C `char *` or `char[]` 
+  - Flash string using `F`,`PSTR` or `FPSTR` macros
+### Fixes 
+ - [176](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/176) - Cleared all compiler warnings
+
+## 3.10.0 [2022-01-20]
+### Features
+ - [167](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/167) - Added `InfluxDBClient::writeRecord(const char *record)`.
+ - [167](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/167) - Added possibility to disable retrying by setting `maxRetryAttempts` to zero: `client.setWriteOptions(WriteOptions().maxRetryAttempts(0));` 
+ - [172](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/172) - Added directly streaming batch for write. It can be enabled by `InfluxDBClient::setStreamWrite(bool enable = true)`. Writing by streaming lines of batch saves RAM as it sends data without allocating a buffer. On the other hand, this way of writing is about half times slower than the classic way, when allocating the buffer for writing the whole batch. 
+  - [172](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/172) - Allowing larger batch size, > 255.
+  - [173](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/173) - Added Flux query parameters. Now supported by InfluxDB Cloud only.
+
+## 3.9.0 [2021-09-17]
+### Features
+ - [#147](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/147) - Updated InfluxDB 2 Cloud CA root certificate to _ISRG Root X1_.   
+ Current InfluxDB 2 Cloud CA root certificate _DST Root CA X3_ expires on September 30th 2021!
+ - [#157](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/157) - Added Buckets sub-client for managing buckets in InfluxDB 2. 
+ 
+### Fixes
+ - [#150](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/150) - `HTTPOptions::httpReadTimeout` is also set as the connect timeout for HTTP connection on ESP32. It also works for HTTPS connection since ESP32 Arduino Core 2.0.0. 
+ - [#156](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/156) - Correctly rounding _writeBufferSize_, when _bufferSize/batchSize >= 256_. 
+ - [#162](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/162) - Fixed flushing of not full buffer after the flush timeout.
+
+ ### Documentation
+ - [#163](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/163) - More precise description of supported devices.
+
+## 3.8.0 [2021-04-01]
+### Features
+ - [#143](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/143) - `InfluxDBClient::setInsecure` now works also for ESP32. Requires Arduino ESP32 SDK 1.0.5 or higher
+
+### Documentation
+ - [#134](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/134):
+   - Added untrusted connection (skipping certificate validation) info to Readme
+   - `SecureWrite` and `SecureBatchWrite` demos enhanced with example about using untrusted connection
+   - Various fixes of typos
+
+### Fixes
+ - [#137](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/137) - Fixed parsing Flux response with unexpected annotations
+
+## 3.7.0 [2020-12-24]
+### Features
+ - [#125](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/124) - Added credentials to the InfluxDB 1.x validation endpoint (/ping). To leverage this, [enable ping authentication](https://docs.influxdata.com/influxdb/v1.8/administration/config/#ping-auth-enabled-false) 
+
+### Fixes
+ - [#129](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/129) - Updated InfluxDB 2 Cloud CA certificate to trust servers from all cloud providers (AWS, Azure, GCP)
+
+## 3.6.1 [2020-11-30]
+### Features
+### Fixes
+- [#121](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/121) - Fixed compile error in case of warning is treated as an error
+- [#122](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/122) - Deleting WiFiClient instance to avoid memory leaking when the InfluxDBClient is reinitialized
+- [#124](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/124) - Fixed compilation warnings
+
+### Doc
+- [#120](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/120) - Improved language wording in the Readme
+
+## 3.6.0 [2020-11-10]
+### Features
+- [#117](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/117) - Added `InfluxDBClient::pointToLineProtocol(const Point& point)` for simple creation of InfluxDB line-protocol string with respect to default tags
+
+### Fixes
+- [#114](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/114) - Renamed `getRemaingRetryTime()`->`getRemainingRetryTime()`
+- [#115](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/115) - Restored writing capability after a connection failure
+- [#118](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/118) - Added escaping of URL params (org, bucker, V1 username and pass)
+
+## 3.5.0 [2020-10-30]
+### Features
+ - [#107](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/107) - Added possibility to set default tags. Use `WriteOptions::addDefaultTag()` to add a tag that will be added to each written point using the `writePoint()` function.
+ - [#109](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/109) - Retry strategy improvements:
+   - Added `canSendRequest()` function to check if retry strategy is applied
+   - Added `getRemaingRetryTime()` function to get wait time before another request (write/query) can be sent
+   - Removed applying retry wait time in case of network error
+   - Better explanatory error message when a request is about to be sent in the retry wait state
+
+### Fixes
+- [#108](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/108) - Added optional param for specifying decimal places of double.: `void Point::addField(String name, double value, int decimalPlaces = 2)`
+- [#111](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/111) - Fixed blocked writing after another point reached max retry count (#110)
+
+## 3.4.0 [2020-10-02]
+### Features
+ - [#89](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/89) - ESP8266 only - Added Max Fragment Length Negotiation for TLS communication to reduce memory allocation. If server supports MFLN, it saves ~10kB. Standalone InfluxDB OSS server doesn't support MFLN, Cloud yes. To leverage MFLN for standalone OSS, a reverse proxy needs to be used. 
+ - [#91](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/91) - Improved API for settings of write and HTTP options:
+    - Introduced `WriteOptions` to wrap the write related options (write precision, batch-size, etc). It offers fluent style API allowing to change only the required options. `InfluxDBClient` has overloaded `setWriteOptions(const WriteOptions& writeOptions)` method.
+    - Introduced `HTTPOptions` to wrap the HTTP related options (e.g. reusing connection). It offers fluent style API allowing to change only the required options. `InfluxDBClient` has `setHTTPOptions(const HTTPOptions& httpOptions)` method.
+    - Added possibility to set HTTP response read timeout (part of the `HTTPOptions`).
+    - Method `InfluxDBClient::void setWriteOptions(WritePrecision precision, uint16_t batchSize = 1, uint16_t bufferSize = 5, uint16_t flushInterval = 60, bool preserveConnection = true)` is deprecated and it will be removed in the next release.
+ - [#93](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/93) - Write logic improvements 
+   - Retry on failure logic unification with other InfluxDB clients (exponential retry, max retry count 3, max retry interval)
+   - Better write buffer memory management
+
+### Documentation
+ - [#87](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/87) - Fixed include file name in the Readme
+ - [#99](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/99) - Changed default InfluxDB 2 port from 9999 to 8086 (default since InfluxDB 2 RC0)
+
+### Fixes
+ - [#90](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/90) - Fixed boolean type recognition of InfluxDB Flux
+ - [#101](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/pull/101) - Better memory efficient point line composition
+
+## Version 3.3.0 (2020-07-07)
+ - [NEW] Added possibility skip server certification validation (`setInsecure()` method)
+ - [NEW] Added possibility to query flux on secured InfluxDB 1.8 using V1 approach
+ - [NEW] `validateConnection()` can be used also for the [forward compatibility](https://docs.influxdata.com/influxdb/latest/tools/api/#influxdb-2-0-api-compatibility-endpoints) connection to InfluxDB 1.8
+ - [FIX] More precise default timestamp generating, up to microseconds
+ - [FIX] Debug compilation error
+ - [FIX] SecureBatchWrite compile error
+ 
+## Version 3.2.0 (2020-06-09)
+- [NEW] Added possibility to read data from InfluxDB using Flux queries
+- [NEW] `timeSync` utility function for synchronous time synchronization using NTP 
+- [FIX] Properly initialize member variable (#59)
+- [FIX] ASCII chars & compilation warning fix (#60)
+- [Update] ESP8266 SDK 2.7+ required
+
+## Version 3.1.3 (2020-04-27)
+ - [FIX] SecureWrite crash (#54)
+ 
+## Version 3.1.2 (2020-04-18)
+ - [FIX] Compilation error on fields order (#43)
+ - [FIX] Invalid precision constant for microseconds (#49)
+ - [FIX] Write error in case point has no tags (#50)
+
+## Version 3.1.1 (2020-04-06)
+ - [Updated] CA Certificate for SSL (#38)
+
+## Version 3.1.0 (2020-03-12)
+ - [NEW] Added User-agent header
+ - [FIX] status code check when pinging an InfluxDB version 1.x instance
+
+## Version 3.0.0 (2020-02-11)
+ - New API with similar keywords as other official InfluxDB clients
+ - Richer set of data types for fields and timestamp methods
+ - Advanced features, such as implicit batching, automatic retrying on server back-pressure and connection failure, along with secured communication over TLS supported for both devices and authentication
+ - Special characters escaping
+ - Backward support for original API of V1/V2

firmware/libraries/ESP8266_Influxdb/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2018-2020 Tobias Schürg, InfluxData
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

firmware/libraries/ESP8266_Influxdb/README.md

@@ -0,0 +1,696 @@
+[![PlatformIO](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/workflows/PlatformIO/badge.svg)](https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino/actions/)
+
+# InfluxDB Arduino Client
+
+Simple Arduino client for writing and reading data from [InfluxDB](https://www.influxdata.com/products/influxdb-overview/), no matter whether it is a local server or InfluxDB Cloud. The library supports authentication, secure communication over TLS, [batching](#writing-in-batches), [automatic retrying](#buffer-handling-and-retrying) on server back-pressure and connection failure.
+
+It also allows setting data in various formats, automatically escapes special characters and offers specifying timestamp in various precisions.
+
+Library supports both [InfluxDB 2](#basic-code-for-influxdb-2) and [InfluxDB 1](#basic-code-for-influxdb-2).
+
+This is a new implementation and the API, [original API](#original-api) is still supported.
+
+Supported devices: 
+ - ESP8266 with [Arduino core for ESP8266](https://github.com/esp8266/Arduino) at least version [3.0.2](https://github.com/esp8266/Arduino/releases/tag/3.0.2).
+ - ESP32 with [Arduino core for the ESP32](https://github.com/espressif/arduino-esp32) at least version [2.0.2](https://github.com/espressif/arduino-esp32/releases/tag/2.0.2). 
+
+This library doesn't support using those devices as a peripheral. 
+
+:warning: Only connection over internal WiFi capability is supported for now.
+
+## Table of contents
+- [InfluxDB Arduino Client](#influxdb-arduino-client)
+  - [Basic code for InfluxDB 2](#basic-code-for-influxdb-2)
+  - [Basic code for InfluxDB 1](#basic-code-for-influxdb-1)
+  - [Connecting to InfluxDB Cloud 2](#connecting-to-influxdb-cloud-2)
+  - [Writing in Batches](#writing-in-batches)
+    - [Timestamp](#timestamp)
+    - [Configure Time](#configure-time)
+    - [Batch Size](#batch-size)
+    - [Large Batch Size](#large-batch-size)
+    - [Write Modes](#write-modes)
+  - [Buffer Handling and Retrying](#buffer-handling-and-retrying)
+  - [Write Options](#write-options)
+  - [HTTP Options](#http-options)
+  - [Secure Connection](#secure-connection)
+    - [InfluxDb 2](#influxdb-2)
+    - [InfluxDb 1](#influxdb-1)
+    - [Skipping certificate validation](#skipping-certificate-validation)
+  - [Querying](#querying)
+    - [Parametrized Queries](#parametrized-queries)
+  - [Original API](#original-api)
+    - [Initialization](#initialization)
+    - [Sending a single measurement](#sending-a-single-measurement)
+    - [Write multiple data points at once](#write-multiple-data-points-at-once)
+  - [Troubleshooting](#troubleshooting)
+  - [Contributing](#contributing)
+  - [License](#license)
+
+
+## Basic code for InfluxDB 2
+After [setting up an InfluxDB 2 server](https://docs.influxdata.com/influxdb/v2.0/get-started/), first define connection parameters and a client instance:
+```cpp
+// InfluxDB 2 server url, e.g. http://192.168.1.48:8086 (Use: InfluxDB UI -> Load Data -> Client Libraries)
+#define INFLUXDB_URL "influxdb-url"
+// InfluxDB 2 server or cloud API authentication token (Use: InfluxDB UI -> Load Data -> Tokens -> <select token>)
+#define INFLUXDB_TOKEN "token"
+// InfluxDB 2 organization name or id (Use: InfluxDB UI -> Settings -> Profile -> <name under tile> )
+#define INFLUXDB_ORG "org"
+// InfluxDB 2 bucket name (Use: InfluxDB UI -> Load Data -> Buckets)
+#define INFLUXDB_BUCKET "bucket"
+
+// Single InfluxDB instance
+InfluxDBClient client(INFLUXDB_URL, INFLUXDB_ORG, INFLUXDB_BUCKET, INFLUXDB_TOKEN);
+```
+
+The next step is adding data. A single row of data is represented by the `Point` class. It consists of a measurement name (like a table name), tags (which labels data) and fields ( the values to store):
+```cpp
+// Define data point in the measurement named 'device_status`
+Point pointDevice("device_status");
+// Set tags
+pointDevice.addTag("device", "ESP8266");
+pointDevice.addTag("SSID", WiFi.SSID());
+// Add data fields
+pointDevice.addField("rssi", WiFi.RSSI());
+pointDevice.addField("uptime", millis());
+```
+
+And finally, write the data to the database:
+```cpp
+// Write data
+client.writePoint(pointDevice);
+```
+
+Complete source code is available in the [BasicWrite example](examples/BasicWrite/BasicWrite.ino).
+
+Data can be seen in the InfluxDB UI immediately. Use the [Data Explorer](https://docs.influxdata.com/influxdb/v2.0/query-data/execute-queries/data-explorer/) or create a [Dashboard](https://docs.influxdata.com/influxdb/v2.0/visualize-data/dashboards/).
+
+## Basic code for InfluxDB 1
+Using InfluxDB Arduino client for InfluxDB 1 is almost the same as for InfluxDB 2. The only difference is that InfluxDB 1 uses _database_ as classic name for data storage instead of bucket and the server is unsecured by default.
+There is also a different `InfluxDBClient constructor` and  `setConnectionParametersV1` function for setting the security params. Everything else remains the same.
+
+```cpp
+// InfluxDB server url, e.g. http://192.168.1.48:8086 (don't use localhost, always server name or ip address)
+#define INFLUXDB_URL "influxdb-url"
+// InfluxDB database name
+#define INFLUXDB_DB_NAME "database"
+
+// Single InfluxDB instance
+InfluxDBClient client(INFLUXDB_URL, INFLUXDB_DB_NAME);
+
+// Define data point with measurement name 'device_status`
+Point pointDevice("device_status");
+// Set tags
+pointDevice.addTag("device", "ESP8266");
+pointDevice.addTag("SSID", WiFi.SSID());
+// Add data
+pointDevice.addField("rssi", WiFi.RSSI());
+pointDevice.addField("uptime", millis());
+
+// Write data
+client.writePoint(pointDevice);
+```
+
+Complete source code is available in [BasicWrite example](examples/BasicWrite/BasicWrite.ino)
+
+## Connecting to InfluxDB Cloud 2
+Instead of setting up a local InfluxDB 2 server, it is possible to quickly [start with InfluxDB Cloud 2](https://docs.influxdata.com/influxdb/cloud/get-started/) with a [Free Plan](https://docs.influxdata.com/influxdb/cloud/account-management/pricing-plans/#free-plan).
+
+InfluxDB Cloud uses secure communication over TLS (https). We need to tell the client to trust this connection. The paragraph bellow describes how to set trusted connection. However, InfluxDB cloud servers have only 3 months validity period. Their CA certificate, included in this library, is valid until 2035. Check [Skipping certification validation](#skipping-certificate-validation) for more details. 
+
+Connecting an Arduino client to InfluxDB Cloud server requires a few additional steps comparing to connecting to local server.
+
+Connection parameters are almost the same as above, the only difference is that server URL now points to the InfluxDB Cloud 2, you set up after you've finished creating an InfluxDB Cloud 2 subscription. You will find the correct server URL in  `InfluxDB UI -> Load Data -> Client Libraries`.
+```cpp
+//Include also InfluxCloud 2 CA certificate
+#include <InfluxDbCloud.h>
+// InfluxDB 2 server or cloud url, e.g. https://eu-central-1-1.aws.cloud2.influxdata.com (Use: InfluxDB UI -> Load Data -> Client Libraries)
+#define INFLUXDB_URL "influxdb-url"
+// InfluxDB 2 server or cloud API authentication token (Use: InfluxDB UI -> Load Data -> Tokens -> <select token>)
+#define INFLUXDB_TOKEN "token"
+// InfluxDB 2 organization name or id (Use: InfluxDB UI -> Settings -> Profile -> <name under tile> )
+#define INFLUXDB_ORG "org"
+// InfluxDB 2 bucket name (Use: InfluxDB UI -> Load Data -> Buckets)
+#define INFLUXDB_BUCKET "bucket"
+```
+
+You need to pass an additional parameter to the client constructor, which is a certificate of the server to trust. The constant `InfluxDbCloud2CACert` contains the InfluxDB Cloud 2 CA certificate, which is predefined in this library:
+```cpp
+// Single InfluxDB instance
+InfluxDBClient client(INFLUXDB_URL, INFLUXDB_ORG, INFLUXDB_BUCKET, INFLUXDB_TOKEN, InfluxDbCloud2CACert);
+```
+Read more about [secure connection](#secure-connection).
+
+Additionally, time needs to be synced:
+```cpp
+// Synchronize time with NTP servers and set timezone
+// Accurate time is necessary for certificate validation and writing in batches
+// For the fastest time sync find NTP servers in your area: https://www.pool.ntp.org/zone/
+configTzTime(TZ_INFO "pool.ntp.org", "time.nis.gov");
+```
+Read more about time synchronization in [Configure Time](#configure-time).
+
+Defining data and writing it to the DB is the same as in the case of [BasicWrite](#basic-code):
+```cpp
+// Define data point with measurement name 'device_status`
+Point pointDevice("device_status");
+// Set tags
+pointDevice.addTag("device", "ESP8266");
+pointDevice.addTag("SSID", WiFi.SSID());
+// Add data
+pointDevice.addField("rssi", WiFi.RSSI());
+pointDevice.addField("uptime", millis());
+
+// Write data
+client.writePoint(pointDevice);
+```
+Complete source code is available in [SecureWrite example](examples/SecureWrite/SecureWrite.ino).
+
+## Writing in Batches
+InfluxDB client for Arduino can also write data in batches. A batch is simply a set of points that will be sent at once. To create a batch, the client will keep all points until the number of points reaches the batch size and then it will write all points at once to the InfluxDB server. This is often more efficient than writing each point separately.
+
+### Timestamp
+If using batch writes, the timestamp should be employed. Timestamp specifies the time when data was gathered and it is used in the form of a number of seconds (milliseconds, etc) from epoch (1.1.1970) UTC.
+If points have no timestamp assigned, InfluxDB assigns a timestamp at the time of writing, which could happen much later than the data has been obtained, because the final batch write will happen when the batch is full (or when [flush buffer](#buffer-handling-and-retrying) is forced).
+
+InfluxDB allows sending timestamps in various precisions - nanoseconds, microseconds, milliseconds or seconds. The milliseconds precision is usually enough for using on Arduino. The maximum available precision is microseconds. Setting the timestamp to nanoseconds will just add zeroes for microseconds fraction and will not improve timestamp accuracy.
+
+The client has to be configured with a time precision. The default settings is to not use the timestamp, which means that the server will assign a timestamp when the data is written to the database. The `setWriteOptions` functions allows setting custom `WriteOptions` params and one of them is __write precision__:
+``` cpp
+// Set write precision to milliseconds. Leave other parameters default.
+client.setWriteOptions(WriteOptions().writePrecision(WritePrecision::MS));
+```
+When a write precision is configured, the client will automatically assign the current time to the timestamp of each written point which doesn't have a timestamp assigned.
+
+If you want to manage timestamp on your own, there are several ways to set the timestamp explicitly.
+- `setTime(WritePrecision writePrecision)` - Sets the timestamp to the actual time in the desired precision. The same precision must set in WriteOptions.
+- `setTime(unsigned long long timestamp)` -  Sets the timestamp to an offset since the epoch. Correct precision must be set InfluxDBClient::setWriteOptions.
+- `setTime(String timestamp)` - Sets the timestamp to an offset since the epoch. Correct precision must be set InfluxDBClient::setWriteOptions.
+
+The `getTime()` method allows copying the timestamp between points.
+
+
+### Configure Time
+Dealing with timestamps, and also validating server or CA certificate, requires that the device has correctly set the time. This can be done with one line of code:
+```cpp
+// Synchronize time with NTP servers and set timezone
+// Accurate time is necessary for certificate validation and writing in batches
+// For the fastest time sync find NTP servers in your area: https://www.pool.ntp.org/zone/
+configTzTime("PST8PDT", "pool.ntp.org", "time.nis.gov");
+```
+The `configTzTime` function starts the time synchronization with NTP servers. The first parameter specifies the timezone information, which is important for distinguishing between UTC and a local timezone and for daylight saving changes.
+The last two string parameters are the internet addresses of NTP servers. Check [pool.ntp.org](https://www.pool.ntp.org/zone) for address of some local NTP servers.
+
+Timezone string details are described at [https://www.gnu.org/software/libc/manual/html_node/TZ-Variable.html](https://www.gnu.org/software/libc/manual/html_node/TZ-Variable.html).
+Values for some timezones:
+- Central Europe: `CET-1CEST,M3.5.0,M10.5.0/3`
+- Eastern: `EST5EDT`
+- Japanese: `JST-9`
+- Pacific Time: `PST8PDT`
+
+There is also another function for syncing the time, which takes timezone and DST offset. As DST info is set via static offset it will create local time problem when DST change occurs.
+It's declaration is following:
+```cpp
+configTime(long gmtOffset_sec, int daylightOffset_sec, const char* server1, const char* server2 = nullptr, const char* server3 = nullptr);
+```
+
+In the example code it would be:
+```cpp
+// Synchronize time with NTP servers
+// Accurate time is necessary for certificate validation and writing in batches
+configTime(3600, 3600, "pool.ntp.org", "time.nis.gov");
+```
+
+Both `configTzTime` and `configTime` functions are asynchronous. This means that calling the functions just starts the time synchronization. Time is often not synchronized yet upon returning from call.
+
+There is a helper function `timeSync` provided with the this library. The function starts time synchronization by calling the `configTzTime` and waits maximum 20 seconds for time to be synchronized. It prints progress info and final local time to the `Serial` console.
+`timeSync` has the same signature as `configTzTime` and it is included with the main header file `InfluxDbClient.h`:
+```cpp
+// Synchronize time with NTP servers and waits for competition. Prints waiting progress and final synchronized time to the Serial.
+// Accurate time is necessary for certificate validation and writing points in batch
+// For the fastest time sync find NTP servers in your area: https://www.pool.ntp.org/zone/
+void timeSync(const char *tzInfo, const char* ntpServer1, const char* ntpServer2 = nullptr, const char* ntpServer3 = nullptr);
+```
+
+### Batch Size
+Setting batch size depends on data gathering and DB updating strategy.
+
+If data is written in short periods (seconds), the batch size should be set according to your expected write periods and update frequency requirements.
+For example, if you would like to see updates (on the dashboard or in processing) each minute and you are measuring a single value (1 point) every 10s (6 points per minute), the batch size should be 6. If it is sufficient to update each hour and you are creating 1 point each minute, your batch size should be 60. 
+
+In cases where the data should be written in longer periods and gathered data consists of several points, the batch size should be set to the expected number of points to be gathered.
+
+To set the batch size we use `WriteOptions` object and  [setWriteOptions](#write-options) function:
+```cpp
+// Enable lines batching
+client.setWriteOptions(WriteOptions().batchSize(10));
+```
+Writing the point will add a point to the underlying buffer until the batch size is reached:
+```cpp
+// Write first point to the buffer
+// Buffered write always returns `true`
+client.writePoint(point1);
+// Write second point to the buffer
+client.writePoint(point2);
+..
+// Write ninth point to the buffer
+client.writePoint(point9);
+// Writing tenth point will cause flushing buffer and returns actual write result.
+if(!client.writePoint(point10)) {
+    Serial.print("InfluxDB write failed: ");
+    Serial.println(client.getLastErrorMessage());
+}
+```
+
+In case cases where the number of points is not always the same, set the batch size to the maximum number of points and use the `flushBuffer()` function to force writing to the database. See [Buffer Handling](#buffer-handling-and-retrying) for more details.
+
+### Large batch size
+The maximum batch size depends on the available RAM of the device (~45KB for ESP8266 and ~260KB for ESP32). Larger batch size, >100 for ESP8255, >2000 for ESP32, must be chosen carefully to not crash the app with out of memory error. The Stream write mode must be used, see [Write Modes](#write-modes)
+
+Always determine your typical line length using `client.pointToLineProtocol(point).length()`. For example, ESP32 can handle 2048 lines with an average length of 69. When the length of line or batch size is increased, the device becomes unstable, even there is more than 76k, it cannot send data or even crashes. ESP8266 handles successfully 330 of such lines. 
+
+:warning: Thoroughly test your app when using large batch files. 
+
+### Write Modes
+Client has two modes of writing:
+ - Buffer (default)
+ - Stream
+
+Writing is performed the way that client keeps written lines (points) separately and when a batch is completed, it allocates a data buffer for sending to a server via WiFi Client.
+This is the fastest way to write data but requires some amount of free memory. Thus a big batch size cannot be used.
+
+Another way of writing is *stream write*. 
+```cpp
+  // Enables stream write
+  client.setStreamWrite(true);
+```
+In this mode client continuously streams lines from batch to WiFi Client. No buffer allocation. As lines are allocated separately, it avoids problems with max allocable block size. The downside is, that writing is about 50% slower than in the Buffer mode.
+
+## Buffer Handling and Retrying
+InfluxDB contains an underlying buffer for handling writing in batches and automatic retrying on server back-pressure and connection failure.
+
+Its size is controlled by the `bufferSize` param of [WriteOptions](#write-options) object:
+```cpp
+// Increase buffer to allow caching of failed writes
+client.setWriteOptions(WriteOptions().bufferSize(50));
+```
+The recommended size is at least 2 x batch size.
+
+The state of the buffer can be determined via two functions:
+ - `isBufferEmpty()` - Returns true if buffer is empty
+ - `isBufferFull()` - Returns true if buffer is full
+
+ A full buffer can occur when there is a problem with the internet connection or the InfluxDB server is overloaded. In such cases, points to write remain in the buffer. When more points are added and connection problem remains, the buffer will reach the top and new points will overwrite older points.
+
+ Each attempt to write a point will try to send older points in the buffer. So, the `isBufferFull()` function can be used to skip low priority points.
+
+The `flushBuffer()` function can be used to force writing, even if the number of points in the buffer is lower than the batch size. With the help of the `isBufferEmpty()` function a check can be made before a device goes to sleep:
+
+ ```cpp
+  // Check whether buffer in not empty
+  if (!client.isBufferEmpty()) {
+      // Write all remaining points to db
+      client.flushBuffer();
+  }
+```
+
+Other functions for dealing with buffer:
+ - `checkBuffer()` - Checks point buffer status and flushes if the number of points reaches batch size or flush interval runs out. This is the main function for controlling the buffer and it is used internally.
+ - `resetBuffer()` - Clears the buffer.
+
+Check [SecureBatchWrite example](examples/SecureBatchWrite/SecureBatchWrite.ino) for example code of buffer handling functions.
+
+## Write Options
+Writing points can be controlled via `WriteOptions`, which is set in the `setWriteOptions` function:
+
+| Parameter | Default Value | Meaning |
+|-----------|---------------|---------|
+| writePrecision | `WritePrecision::NoTime` | Timestamp precision of written data |
+| batchSize | `1` | Number of points that will be written to the database at once |
+| bufferSize | `5` | Maximum number of points in buffer. Buffer contains new data that will be written to the database and also data that failed to be written due to network failure or server overloading |
+| flushInterval | `60` | Maximum time(in seconds) data will be held in buffer before points are written to the db |
+| retryInterval | `5` | Default retry interval in sec, if not sent by server. Value `0` disables retrying |
+| maxRetryInterval | `300` |  Maximum retry interval in sec |
+| maxRetryAttempts | `3` | Maximum count of retry attempts of failed writes |
+
+## HTTP Options
+`HTTPOptions` controls some aspects of HTTP communication and they are set via `setHTTPOptions` function:
+| Parameter | Default Value | Meaning |
+|-----------|---------------|---------|
+| connectionReuse | `false` | Whether HTTP connection should be kept open after initial communication. Usable for frequent writes/queries. |
+| httpReadTimeout | `5000` | Timeout (ms) for reading server response |
+
+## Secure Connection
+Connecting to a secured server requires configuring the client to trust the server. This is achieved by providing the client with a server certificate, certificate authority certificate or certificate SHA1 fingerprint.
+
+:memo: In ESP32 arduino SDK (1.0.4), `WiFiClientSecure` doesn't support fingerprint to validate the server certificate.
+
+The certificate (in PEM format) or SHA1 fingerprint should be placed in flash memory to save RAM.
+Code bellow is an example certificate in PEM format. Valid InfluxDB 2 Cloud CA certificate is included in the library in the constant `InfluxDbCloud2CACert`, located in the `InfluxDBCloud.h`.
+
+You can use a custom server certificate by exporting it, e.g. using a web browser:
+```cpp
+// Server certificate in PEM format, placed in the program (flash) memory to save RAM
+const char ServerCert[] PROGMEM =  R"EOF(
+-----BEGIN CERTIFICATE-----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=
+-----END CERTIFICATE-----
+)EOF";
+
+// Alternatively, use a fingerprint of server certificate to set trust. Works only for ESP8266.
+const char ServerCert[] PROGMEM = "cabd2a79a1076a31f21d253635cb039d4329a5e8";
+```
+
+### InfluxDb 2
+There are two ways to set the certificate or fingerprint to trust a server:
+ - Use full param constructor
+```cpp
+// InfluxDB client instance with preconfigured InfluxCloud certificate
+InfluxDBClient client(INFLUXDB_URL, INFLUXDB_ORG, INFLUXDB_BUCKET, INFLUXDB_TOKEN, ServerCert);
+```
+- Use `setConnectionParams` function:
+```cpp
+// InfluxDB client instance
+InfluxDBClient client;
+
+void setup() {
+    // configure client
+    client.setConnectionParams(INFLUXDB_URL, INFLUXDB_ORG, INFLUXDB_BUCKET, INFLUXDB_TOKEN, ServerCert);
+}
+```
+### InfluxDb 1
+
+Use `setConnectionParamsV1` function:
+```cpp
+// InfluxDB client instance
+InfluxDBClient client;
+
+void setup() {
+    // configure client
+    client.setConnectionParamsV1(INFLUXDB_URL, INFLUXDB_DATABASE, INFLUXDB_USER, INFLUXDB_PASSWORD, ServerCert);
+}
+```
+Another important prerequisite to successfully validate a server or CA certificate is to have properly synchronized time. More on this in [Configure Time](#configure-time).
+
+:information_source: Time synchronization is not required for validating server certificate via SHA1 fingerprint.
+
+### Skipping certificate validation
+The CA certificate provided with the library is ISRG Root X1. This certificate lasts a very long time, until 2035. It is not necessary to update your device until then when using ISRG Root X1.
+
+If you are using your own certificate, plase keep in mind server certificates have limited validity period, often only a few months. It will be necessary to frequently change trusted certificate in the source code and reflashing the device. A solution could be using OTA update, but you will still need to care about certificate validity and updating it ahead of time to avoid connection failures.
+
+The best way to prevent frequent updates is to use a root certificate like the one provided with the library. If you are unable to use a root certificate from a trusted authority, you may want to use insecure mode instead. This is done with the help of `InfluxDBClient::setInsecure()` method. 
+You will also save space in flash (and RAM) by leaving certificate param empty when calling constructor or `setConnectionParams` method.
+
+:memo: The `InfluxDBClient::setInsecure()` method must be called before calling any function that will establish connection. The best place to call it is in the `setup` method: 
+
+```cpp
+// InfluxDB client instance without a server certificate
+InfluxDBClient client(INFLUXDB_URL, INFLUXDB_ORG, INFLUXDB_BUCKET, INFLUXDB_TOKEN);
+
+void setup() {
+    // Set insecure connection to skip server certificate validation 
+    client.setInsecure();
+}
+```
+
+:warning: Using untrusted connection is a security risk.
+
+## Querying
+InfluxDB 2 and InfluxDB 1.7+ (with [enabled flux](https://docs.influxdata.com/influxdb/latest/administration/config/#flux-enabled-false)) uses [Flux](https://www.influxdata.com/products/flux/) to process and query data. InfluxDB client for Arduino offers a simple, but powerful, way how to query data with `query` function. It parses response line by line, so it can read a huge responses (thousands data lines), without consuming a lot device memory.
+
+The `query` returns `FluxQueryResult` object, which parses response and provides useful getters for accessing values from result set.
+
+The InfluxDB flux query result set is returned in CSV format. In the example below, the first line contains type information and the second column names, and the rest is data:
+```CSV
+#datatype,string,long,dateTime:RFC3339,dateTime:RFC3339,dateTime:RFC3339,long,string,string,string,string
+,result,table,_start,_stop,_time,_value,SSID,_field,_measurement,device
+,_result,0,2020-05-18T15:06:00.475253281Z,2020-05-19T15:06:00.475253281Z,2020-05-19T13:07:13Z,-55,667G,rssi,wifi_status,ESP32
+,_result,0,2020-05-18T15:06:00.475253281Z,2020-05-19T15:06:00.475253281Z,2020-05-19T13:07:27Z,-54,667G,rssi,wifi_status,ESP32
+,_result,0,2020-05-18T15:06:00.475253281Z,2020-05-19T15:06:00.475253281Z,2020-05-19T13:07:40Z,-54,667G,rssi,wifi_status,ESP32
+,_result,0,2020-05-18T15:06:00.475253281Z,2020-05-19T15:06:00.475253281Z,2020-05-19T13:07:54Z,-54,667G,rssi,wifi_status,ESP32
+,_result,0,2020-05-18T15:06:00.475253281Z,2020-05-19T15:06:00.475253281Z,2020-05-19T13:08:07Z,-55,667G,rssi,wifi_status,ESP32
+,_result,0,2020-05-18T15:06:00.475253281Z,2020-05-19T15:06:00.475253281Z,2020-05-19T13:08:20Z,-56,667G,rssi,wifi_status,ESP32
+```
+
+Accessing data using `FluxQueryResult` requires knowing the query result structure, especially the name and the type of the column. The best practice is to tune the query
+in the `InfluxDB Data Explorer` and use the final query with this library.
+
+ Browsing thought the result set is done by repeatedly calling the `next()` method, until it returns false. Unsuccessful reading is distinguished by a non empty value from the `getError()` method.
+ As a flux query result can contain several tables, differing by grouping key, use the `hasTableChanged()` method to determine when there is a new table.
+ Single values are returned using the `getValueByIndex()` or `getValueByName()` methods.
+ All row values at once are retrieved by the `getValues()` method.
+  Always call the `close()` method at the of reading.
+
+A value in the flux query result column, retrieved by the `getValueByIndex()` or `getValueByName()` methods, is represented by the `FluxValue` object.
+It provides getter methods for supported flux types:
+
+| Flux type | Getter | C type |
+| ----- | ------ |  --- |
+| long | getLong() | long |
+| unsignedLong | getUnsignedLong() | unsigned long |
+| dateTime:RFC3339, dateTime:RFC3339Nano | getDateTime() |  [FluxDateTime](src/query/FluxTypes.h#L100) |
+| bool | getBool() | bool |
+| double | bool | double |
+| string, base64binary, duration | getString() | String |
+
+Calling improper type getter will result in a zero (empty) value.
+
+Check for null (missing) value using the `isNull()` method.
+
+Use the `getRawValue()` method for getting the original string form.
+
+```cpp
+// Construct a Flux query
+// Query will find RSSI for last 24 hours for each connected WiFi network with this device computed by given selector function
+String query = "from(bucket: \"my-bucket\") |> range(start: -24h) |> filter(fn: (r) => r._measurement == \"wifi_status\" and r._field == \"rssi\"";
+query += "and r.device == \"ESP32\")";
+query += "|> max()";
+
+// Send query to the server and get result
+FluxQueryResult result = client.query(query);
+
+// Iterate over rows. Even there is just one row, next() must be called at least once.
+while (result.next()) {
+  // Get typed value for flux result column 'SSID'
+  String ssid = result.getValueByName("SSID").getString();
+  Serial.print("SSID '");
+  Serial.print(ssid);
+
+  Serial.print("' with RSSI ");
+
+  // Get converted value for flux result column '_value' where there is RSSI value
+  long value = result.getValueByName("_value").getLong();
+  Serial.print(value);
+
+  // Format date-time for printing
+  // Format string according to http://www.cplusplus.com/reference/ctime/strftime/
+  String timeStr = time.format("%F %T");
+
+  Serial.print(" at ");
+  Serial.print(timeStr);
+
+  Serial.println();
+}
+
+// Check if there was an error
+if(result.getError() != "") {
+  Serial.print("Query result error: ");
+  Serial.println(result.getError());
+}
+```
+Complete source code is available in [QueryAggregated example](examples/QueryAggregated/QueryAggregated.ino).
+
+### Parametrized Queries
+InfluxDB Cloud supports [Parameterized Queries](https://docs.influxdata.com/influxdb/cloud/query-data/parameterized-queries/)
+that let you dynamically change values in a query using the InfluxDB API. Parameterized queries make Flux queries more
+reusable and can also be used to help prevent injection attacks.
+
+InfluxDB Cloud inserts the params object into the Flux query as a Flux record named `params`. Use dot or bracket
+notation to access parameters in the `params` record in your Flux query. Parameterized Flux queries support only `int`
+, `float`, and `string` data types. To convert the supported data types into
+other [Flux basic data types, use Flux type conversion functions](https://docs.influxdata.com/influxdb/cloud/query-data/parameterized-queries/#supported-parameter-data-types).
+
+Parameterized query example:
+> :warning: Parameterized Queries are supported only in InfluxDB Cloud. There is no support in InfluxDB OSS currently.
+
+```cpp
+// Prepare query parameters
+QueryParams params;
+params.add("bucket", INFLUXDB_BUCKET);
+params.add("since", "-5m");
+params.add("device", DEVICE);
+params.add("rssiThreshold", -50);
+
+// Construct a Flux query using parameters
+// Parameters are accessed via the 'params' Flux object
+// Flux only supports only string, float and int as parameters. Duration can be converted from string.
+// Query will find RSSI less than defined threshold
+String query = "from(bucket: params.bucket) |> range(start: duration(v: params.since)) \
+  |> filter(fn: (r) => r._measurement == \"wifi_status\") \
+  |> filter(fn: (r) => r._field == \"rssi\") \
+  |> filter(fn: (r) => r.device == params.device) \
+  |> filter(fn: (r) => r._value < params.rssiThreshold)";
+
+// Print ouput header
+// Print composed query
+Serial.print("Querying with: ");
+Serial.println(query);
+
+// Send query to the server and get result
+FluxQueryResult result = client.query(query, params);
+
+//Print header
+Serial.printf("%10s %20s %5s\n","Time","SSID","RSSI");
+
+for(int i=0;i<37;i++) {
+  Serial.print('-');
+}
+Serial.println();
+
+// Iterate over rows. Even there is just one row, next() must be called at least once.
+int c = 0;
+while (result.next()) {
+  // Get converted value for flux result column 'SSID'
+  String ssid = result.getValueByName("SSID").getString();
+  
+  // Get converted value for flux result column '_value' where there is RSSI value
+  long rssi = result.getValueByName("_value").getLong();
+
+  // Get converted value for the _time column
+  FluxDateTime time = result.getValueByName("_time").getDateTime();
+
+  // Format date-time for printing
+  // Format string according to http://www.cplusplus.com/reference/ctime/strftime/
+  String timeStr = time.format("%F %T");
+  // Print formatted row
+  Serial.printf("%20s %10s %5d\n", timeStr.c_str(), ssid.c_str() ,rssi);
+  c++;
+}
+if(!c) {
+  Serial.println(" No data found");
+}
+
+// Check if there was an error
+if(result.getError() != "") {
+  Serial.print("Query result error: ");
+  Serial.println(result.getError());
+}
+
+// Close the result
+result.close();
+```
+Complete source code is available in [QueryParams example](examples/QueryParams/QueryParams.ino).
+
+## Original API
+
+### Initialization
+```cpp
+ #define INFLUXDB_HOST "192.168.0.32"
+ #define INFLUXDB_PORT 1337
+ #define INFLUXDB_DATABASE "test"
+ //if used with authentication
+ #define INFLUXDB_USER "user"
+ #define INFLUXDB_PASS "password"
+
+ // connect to WiFi
+
+ Influxdb influx(INFLUXDB_HOST); // port defaults to 8086
+ // or to use a custom port
+ Influxdb influx(INFLUXDB_HOST, INFLUXDB_PORT);
+
+ // set the target database
+ influx.setDb(INFLUXDB_DATABASE);
+ // or use a db with auth
+ influx.setDbAuth(INFLUXDB_DATABASE, INFLUXDB_USER, INFLUXDB_PASS) // with authentication
+
+// To use the v2.0 InfluxDB
+influx.setVersion(2);
+influx.setOrg("myOrganization");
+influx.setBucket("myBucket");
+influx.setToken("myToken");
+influx.setPort(8086);
+```
+
+### Sending a single measurement
+**Using an InfluxData object:**
+```cpp
+// create a measurement object
+InfluxData measurement ("temperature");
+measurement.addTag("device", d2);
+measurement.addTag("sensor", "dht11");
+measurement.addValue("value", 24.0);
+
+// write it into db
+influx.write(measurement);
+```
+
+**Using raw-data**
+```cpp
+ influx.write("temperature,device=d2,sensor=dht11 value=24.0")
+```
+
+### Write multiple data points at once
+Batching measurements and send them with a single request will result in a much higher performance.
+```cpp
+
+InfluxData measurement1 = readTemperature()
+influx.prepare(measurement1)
+
+InfluxData measurement2 = readLight()
+influx.prepare(measurement2)
+
+InfluxData measurement3 = readVoltage()
+influx.prepare(measurement3)
+
+// writes all prepared measurements with a single request into db.
+boolean success = influx.write();
+```
+
+## Troubleshooting
+All db methods return status. Value `false` means something went wrong. Call `getLastErrorMessage()` to get the error message.
+
+When error message doesn't help to explain the bad behavior, go to the library sources and in the file `src/util/debug.h` uncomment line 33:
+```cpp
+// Uncomment bellow in case of a problem and rebuild sketch
+#define INFLUXDB_CLIENT_DEBUG_ENABLE
+```
+Then upload your sketch again and see the debug output in the Serial Monitor.
+
+If you couldn't solve a problem by yourself, please, post an issue including the debug output.
+
+## Contributing
+
+If you would like to contribute code you can do through GitHub by forking the repository and sending a pull request into the `master` branch.
+
+## License
+
+The InfluxDB Arduino Client is released under the [MIT License](https://opensource.org/licenses/MIT).

firmware/libraries/ESP8266_Influxdb/examples/BasicWrite/BasicWrite.ino

@@ -0,0 +1,98 @@
+/**
+ * Basic Write Example code for InfluxDBClient library for Arduino
+ * Data can be immediately seen in a InfluxDB UI: wifi_status measurement
+ * Enter WiFi and InfluxDB parameters below
+ *
+ * Measures signal level of the actually connected WiFi network
+ * This example supports only InfluxDB running from unsecure (http://...)
+ * For secure (https://...) or Influx Cloud 2 use SecureWrite example
+ **/
+
+#if defined(ESP32)
+#include <WiFiMulti.h>
+WiFiMulti wifiMulti;
+#define DEVICE "ESP32"
+#elif defined(ESP8266)
+#include <ESP8266WiFiMulti.h>
+ESP8266WiFiMulti wifiMulti;
+#define DEVICE "ESP8266"
+#endif
+
+#include <InfluxDbClient.h>
+
+// WiFi AP SSID
+#define WIFI_SSID "ssid"
+// WiFi password
+#define WIFI_PASSWORD "password"
+// InfluxDB  server url. Don't use localhost, always server name or ip address.
+// E.g. http://192.168.1.48:8086 (In InfluxDB 2 UI -> Load Data -> Client Libraries), 
+#define INFLUXDB_URL "influxdb-url"
+// InfluxDB 2 server or cloud API authentication token (Use: InfluxDB UI -> Load Data -> Tokens -> <select token>)
+#define INFLUXDB_TOKEN "toked-id"
+// InfluxDB 2 organization id (Use: InfluxDB UI -> Settings -> Profile -> <name under tile> )
+#define INFLUXDB_ORG "org"
+// InfluxDB 2 bucket name (Use: InfluxDB UI -> Load Data -> Buckets)
+#define INFLUXDB_BUCKET "bucket"
+// InfluxDB v1 database name 
+//#define INFLUXDB_DB_NAME "database"
+
+// InfluxDB client instance
+InfluxDBClient client(INFLUXDB_URL, INFLUXDB_ORG, INFLUXDB_BUCKET, INFLUXDB_TOKEN);
+// InfluxDB client instance for InfluxDB 1
+//InfluxDBClient client(INFLUXDB_URL, INFLUXDB_DB_NAME);
+
+// Data point
+Point sensor("wifi_status");
+
+void setup() {
+  Serial.begin(115200);
+
+  // Connect WiFi
+  Serial.println("Connecting to WiFi");
+  WiFi.mode(WIFI_STA);
+  wifiMulti.addAP(WIFI_SSID, WIFI_PASSWORD);
+  while (wifiMulti.run() != WL_CONNECTED) {
+    Serial.print(".");
+    delay(500);
+  }
+  Serial.println();
+
+  // Set InfluxDB 1 authentication params
+  //client.setConnectionParamsV1(INFLUXDB_URL, INFLUXDB_DB_NAME, INFLUXDB_USER, INFLUXDB_PASSWORD);
+
+  // Add constant tags - only once
+  sensor.addTag("device", DEVICE);
+  sensor.addTag("SSID", WiFi.SSID());
+
+  // Check server connection
+  if (client.validateConnection()) {
+    Serial.print("Connected to InfluxDB: ");
+    Serial.println(client.getServerUrl());
+  } else {
+    Serial.print("InfluxDB connection failed: ");
+    Serial.println(client.getLastErrorMessage());
+  }
+}
+
+void loop() {
+  // Store measured value into point
+  sensor.clearFields();
+  // Report RSSI of currently connected network
+  sensor.addField("rssi", WiFi.RSSI());
+  // Print what are we exactly writing
+  Serial.print("Writing: ");
+  Serial.println(client.pointToLineProtocol(sensor));
+  // If no Wifi signal, try to reconnect it
+  if (wifiMulti.run() != WL_CONNECTED) {
+    Serial.println("Wifi connection lost");
+  }
+  // Write point
+  if (!client.writePoint(sensor)) {
+    Serial.print("InfluxDB write failed: ");
+    Serial.println(client.getLastErrorMessage());
+  }
+
+  //Wait 10s
+  Serial.println("Wait 10s");
+  delay(10000);
+}

firmware/libraries/ESP8266_Influxdb/examples/Buckets/Buckets.ino

@@ -0,0 +1,136 @@
+/**
+ * Buckets management Example code for InfluxDBClient library for Arduino
+ * Enter WiFi and InfluxDB parameters below
+ *
+ * This example supports only InfluxDB running from unsecure (http://...)
+ * For secure (https://...) or Influx Cloud 2 connection check SecureWrite example to 
+ * see how connect using secured connection (https)
+ **/
+
+#if defined(ESP32)
+#include <WiFiMulti.h>
+WiFiMulti wifiMulti;
+#define DEVICE "ESP32"
+#elif defined(ESP8266)
+#include <ESP8266WiFiMulti.h>
+ESP8266WiFiMulti wifiMulti;
+#define DEVICE "ESP8266"
+#endif
+
+#include <InfluxDbClient.h>
+
+// WiFi AP SSID
+#define WIFI_SSID "ssid"
+// WiFi password
+#define WIFI_PASSWORD "password"
+// InfluxDB  server url. Don't use localhost, always server name or ip address.
+// E.g. http://192.168.1.48:8086 (In InfluxDB 2 UI -> Load Data -> Client Libraries), 
+#define INFLUXDB_URL "influxdb-url"
+// InfluxDB 2 server or cloud API authentication token (Use: InfluxDB UI -> Load Data -> Tokens -> <select token>)
+// This token must have all buckets permission
+#define INFLUXDB_TOKEN "toked-id"
+// InfluxDB 2 organization id (Use: InfluxDB UI -> Settings -> Profile -> <name under tile> )
+#define INFLUXDB_ORG "org"
+// Bucket name that doesn't exist in the db yet
+#define INFLUXDB_BUCKET "test-bucket"
+
+void setup() {
+  Serial.begin(74880);
+
+  // Connect WiFi
+  Serial.println("Connecting to " WIFI_SSID);
+  WiFi.mode(WIFI_STA);
+  wifiMulti.addAP(WIFI_SSID, WIFI_PASSWORD);
+  while (wifiMulti.run() != WL_CONNECTED) {
+    Serial.print(".");
+    delay(500);
+  }
+  Serial.println();
+}
+
+// Creates client, bucket, writes data, verifies data and deletes bucket
+void testClient() {
+  // InfluxDB client instance
+  InfluxDBClient client(INFLUXDB_URL, INFLUXDB_ORG, INFLUXDB_BUCKET, INFLUXDB_TOKEN);
+
+  // Check server connection
+  if (client.validateConnection()) {
+    Serial.print("Connected to InfluxDB: ");
+    Serial.println(client.getServerUrl());
+  } else {
+    Serial.print("InfluxDB connection failed: ");
+    Serial.println(client.getLastErrorMessage());
+    return;
+  }
+
+  // Get dedicated client for buckets management
+  BucketsClient buckets = client.getBucketsClient();
+  
+  // Verify bucket does not exist, or delete it
+  if(buckets.checkBucketExists(INFLUXDB_BUCKET)) {
+    Serial.println("Bucket " INFLUXDB_BUCKET " already exists, deleting" );
+    // get reference
+    Bucket b = buckets.findBucket(INFLUXDB_BUCKET);
+    // Delete bucket
+    buckets.deleteBucket(b.getID());
+  } 
+
+  // create a bucket with retention policy one month. Leave out or set zero to infinity
+  uint32_t monthSec = 30*24*3600;
+  Bucket b = buckets.createBucket(INFLUXDB_BUCKET, monthSec);
+  if(!b) {
+    // some error occurred
+    Serial.print("Bucket creating error: ");
+    Serial.println(buckets.getLastErrorMessage());
+    return;
+  }
+  Serial.print("Created bucket: ");
+  Serial.println(b.toString());
+  
+  int numPoints = 10;
+  // Write some points
+  for(int i=0;i<numPoints;i++) {
+    Point point("test");
+    point.addTag("device_name", DEVICE);
+    point.addField("temperature", random(-20, 40) * 1.1f);
+    point.addField("humidity", random(10, 90));
+    if(!client.writePoint(point)) {
+      Serial.print("Write error: ");
+      Serial.println(client.getLastErrorMessage());
+    }
+  }
+  // verify written points
+  String query= "from(bucket: \"" INFLUXDB_BUCKET "\") |> range(start: -1h) |> pivot(rowKey:[\"_time\"],columnKey: [\"_field\"],valueColumn: \"_value\") |> count(column: \"humidity\")";
+  FluxQueryResult result = client.query(query);
+  // We expect one row
+  if(result.next()) { 
+    // Get count value
+    FluxValue val = result.getValueByName("humidity");
+    if(val.getLong() != numPoints) {
+      Serial.print("Test failure, expected ");
+      Serial.print(numPoints);
+      Serial.print(" got ");
+      Serial.println(val.getLong());
+    } else {
+      Serial.println("Test successfull");
+    }
+    // Advance to the end
+    result.next();
+  } else {
+    Serial.print("Query error: ");
+    Serial.println(result.getError());
+  };
+  result.close();
+      
+  buckets.deleteBucket(b.getID());
+}
+
+void loop() {
+  // Lets do an E2E test
+  // call a client test
+  testClient();
+  
+  Serial.println("Stopping");
+  // Stop here, don't loop
+  while(1) delay(1);
+}

firmware/libraries/ESP8266_Influxdb/examples/QueryAggregated/QueryAggregated.ino

@@ -0,0 +1,163 @@
+/**
+ * QueryAggregated Example code for InfluxDBClient library for Arduino.
+ * 
+ * This example demonstrates querying basic aggregated statistic parameters of WiFi signal level measured and stored in BasicWrite and SecureWrite examples.
+ * 
+ * Demonstrates connection to any InfluxDB instance accesible via:
+ *  - unsecured http://...
+ *  - secure https://... (appropriate certificate is required)
+ *  - InfluxDB 2 Cloud at https://cloud2.influxdata.com/ (certificate is preconfigured)
+ * 
+ *  Enter WiFi and InfluxDB parameters below
+ **/
+
+#if defined(ESP32)
+#include <WiFiMulti.h>
+WiFiMulti wifiMulti;
+#define DEVICE "ESP32"
+#elif defined(ESP8266)
+#include <ESP8266WiFiMulti.h>
+ESP8266WiFiMulti wifiMulti;
+#define DEVICE "ESP8266"
+#endif
+
+#include <InfluxDbClient.h>
+#include <InfluxDbCloud.h>
+
+// WiFi AP SSID
+#define WIFI_SSID "SSID"
+// WiFi password
+#define WIFI_PASSWORD "PASSWORD"
+// InfluxDB v2 server url, e.g. https://eu-central-1-1.aws.cloud2.influxdata.com (Use: InfluxDB UI -> Load Data -> Client Libraries)
+// InfluxDB 1.8+  (v2 compatibility API) server url, e.g. http://192.168.1.48:8086
+#define INFLUXDB_URL "server-url"
+// InfluxDB v2 server or cloud API authentication token (Use: InfluxDB UI -> Load Data -> Tokens -> <select token>)
+// InfluxDB 1.8+ (v2 compatibility API) use form user:password, eg. admin:adminpass
+#define INFLUXDB_TOKEN "server token"
+// InfluxDB v2 organization name or id (Use: InfluxDB UI -> Settings -> Profile -> <name under tile> )
+// InfluxDB 1.8+ (v2 compatibility API) use any non empty string
+#define INFLUXDB_ORG "org name/id"
+// InfluxDB v2 bucket name (Use: InfluxDB UI -> Load Data -> Buckets)
+// InfluxDB 1.8+ (v2 compatibility API) use database name
+#define INFLUXDB_BUCKET "bucket name"
+
+// Set timezone string according to https://www.gnu.org/software/libc/manual/html_node/TZ-Variable.html
+// Examples:
+//  Pacific Time: "PST8PDT"
+//  Eastern: "EST5EDT"
+//  Japanesse: "JST-9"
+//  Central Europe: "CET-1CEST,M3.5.0,M10.5.0/3"
+#define TZ_INFO "CET-1CEST,M3.5.0,M10.5.0/3"
+
+// InfluxDB client instance with preconfigured InfluxCloud certificate
+InfluxDBClient client(INFLUXDB_URL, INFLUXDB_ORG, INFLUXDB_BUCKET, INFLUXDB_TOKEN, InfluxDbCloud2CACert);
+
+void setup() {
+  Serial.begin(115200);
+
+  // Setup wifi
+  WiFi.mode(WIFI_STA);
+  wifiMulti.addAP(WIFI_SSID, WIFI_PASSWORD);
+
+  Serial.print("Connecting to wifi");
+  while (wifiMulti.run() != WL_CONNECTED) {
+    Serial.print(".");
+    delay(500);
+  }
+  Serial.println();
+
+  
+  // Accurate time is necessary for certificate validation
+  // For the fastest time sync find NTP servers in your area: https://www.pool.ntp.org/zone/
+  // Syncing progress and the time will be printed to Serial
+  timeSync(TZ_INFO, "pool.ntp.org", "time.nis.gov");
+
+  // Check server connection
+  if (client.validateConnection()) {
+    Serial.print("Connected to InfluxDB: ");
+    Serial.println(client.getServerUrl());
+  } else {
+    Serial.print("InfluxDB connection failed: ");
+    Serial.println(client.getLastErrorMessage());
+  }
+}
+
+
+void loop() {
+  // Get max RSSI
+  printAgregateResult("max");
+  // Get mean RSSI
+  printAgregateResult("mean");
+  // Get min RSSI
+  printAgregateResult("min");
+
+  //Wait 10s
+  Serial.println("Wait 10s");
+  delay(10000);
+}
+
+// printAgregateResult queries db for aggregated RSSI value computed by given InfluxDB selector function (max, mean, min)
+// Prints composed query and the result values.
+void printAgregateResult(String selectorFunction) {
+  // Construct a Flux query
+  // Query will find RSSI for last hour for each connected WiFi network with this device computed by given selector function
+  String query = "from(bucket: \"" INFLUXDB_BUCKET "\") |> range(start: -1h) |> filter(fn: (r) => r._measurement == \"wifi_status\" and r._field == \"rssi\"";
+  query += " and r.device == \""  DEVICE  "\")";
+  query += "|> " + selectorFunction + "()";
+
+  // Print ouput header
+  Serial.print("==== ");
+  Serial.print(selectorFunction);
+  Serial.println(" ====");
+
+  // Print composed query
+  Serial.print("Querying with: ");
+  Serial.println(query);
+
+  // Send query to the server and get result
+  FluxQueryResult result = client.query(query);
+
+  // Iterate over rows. Even there is just one row, next() must be called at least once.
+  while (result.next()) {
+    // Get converted value for flux result column 'SSID'
+    String ssid = result.getValueByName("SSID").getString();
+    Serial.print("SSID '");
+    Serial.print(ssid);
+
+    Serial.print("' with RSSI ");
+    // Get converted value for flux result column '_value' where there is RSSI value
+    // RSSI is integer value and so on min and max selected results, 
+    // whereas mean is computed and the result type is double.
+    if(selectorFunction == "mean") {
+      double value = result.getValueByName("_value").getDouble();
+      Serial.print(value, 1);
+      // computed value has not got a _time column, so omitting getting time here
+    } else {
+      long value = result.getValueByName("_value").getLong();
+      Serial.print(value);
+
+      // Get converted value for the _time column
+      FluxDateTime time = result.getValueByName("_time").getDateTime();
+
+      // Format date-time for printing
+      // Format string according to http://www.cplusplus.com/reference/ctime/strftime/
+      String timeStr = time.format("%F %T");
+
+      Serial.print(" at ");
+      Serial.print(timeStr);
+    }
+
+    
+    Serial.println();
+  }
+
+  // Check if there was an error
+  if(result.getError() != "") {
+    Serial.print("Query result error: ");
+    Serial.println(result.getError());
+  }
+
+  // Close the result
+  result.close();
+}
+

firmware/libraries/ESP8266_Influxdb/examples/QueryParams/QueryParams.ino

@@ -0,0 +1,154 @@
+/**
+ * QueryParams Example code for InfluxDBClient library for Arduino.
+  * 
+ * This example demonstrates querying using parameters inserted into the Flux query. We select WiFi signal level values bellow a certain threshold. 
+ * WiFi signal is measured and stored in BasicWrite and SecureWrite examples.
+ * 
+ * Demonstrates connection to any InfluxDB instance accesible via:
+ *  - InfluxDB 2 Cloud at https://cloud2.influxdata.com/ (certificate is preconfigured)
+ * 
+ *  Enter WiFi and InfluxDB parameters below
+ **/
+
+#if defined(ESP32)
+#include <WiFiMulti.h>
+WiFiMulti wifiMulti;
+#define DEVICE "ESP32"
+#elif defined(ESP8266)
+#include <ESP8266WiFiMulti.h>
+ESP8266WiFiMulti wifiMulti;
+#define DEVICE "ESP8266"
+#endif
+
+#include <InfluxDbClient.h>
+#include <InfluxDbCloud.h>
+
+// WiFi AP SSID
+#define WIFI_SSID "SSID"
+// WiFi password
+#define WIFI_PASSWORD "PASSWORD"
+// InfluxDB v2 server url, e.g. https://eu-central-1-1.aws.cloud2.influxdata.com (Use: InfluxDB UI -> Load Data -> Client Libraries)
+// InfluxDB 1.8+  (v2 compatibility API) server url, e.g. http://192.168.1.48:8086
+#define INFLUXDB_URL "server-url"
+// InfluxDB v2 server or cloud API authentication token (Use: InfluxDB UI -> Load Data -> Tokens -> <select token>)
+// InfluxDB 1.8+ (v2 compatibility API) use form user:password, eg. admin:adminpass
+#define INFLUXDB_TOKEN "server token"
+// InfluxDB v2 organization name or id (Use: InfluxDB UI -> Settings -> Profile -> <name under tile> )
+// InfluxDB 1.8+ (v2 compatibility API) use any non empty string
+#define INFLUXDB_ORG "org name/id"
+// InfluxDB v2 bucket name (Use: InfluxDB UI -> Load Data -> Buckets)
+// InfluxDB 1.8+ (v2 compatibility API) use database name
+#define INFLUXDB_BUCKET "bucket name"
+
+// Set timezone string according to https://www.gnu.org/software/libc/manual/html_node/TZ-Variable.html
+// Examples:
+//  Pacific Time: "PST8PDT"
+//  Eastern: "EST5EDT"
+//  Japanesse: "JST-9"
+//  Central Europe: "CET-1CEST,M3.5.0,M10.5.0/3"
+#define TZ_INFO "CET-1CEST,M3.5.0,M10.5.0/3"
+
+// InfluxDB client instance with preconfigured InfluxCloud certificate
+InfluxDBClient client(INFLUXDB_URL, INFLUXDB_ORG, INFLUXDB_BUCKET, INFLUXDB_TOKEN, InfluxDbCloud2CACert);
+
+void setup() {
+  Serial.begin(115200);
+
+  // Setup wifi
+  WiFi.mode(WIFI_STA);
+  wifiMulti.addAP(WIFI_SSID, WIFI_PASSWORD);
+
+  Serial.print("Connecting to wifi");
+  while (wifiMulti.run() != WL_CONNECTED) {
+    Serial.print(".");
+    delay(500);
+  }
+  Serial.println();
+
+  
+  // Accurate time is necessary for certificate validation
+  // For the fastest time sync find NTP servers in your area: https://www.pool.ntp.org/zone/
+  // Syncing progress and the time will be printed to Serial
+  timeSync(TZ_INFO, "pool.ntp.org", "time.nis.gov");
+
+  // Check server connection
+  if (client.validateConnection()) {
+    Serial.print("Connected to InfluxDB: ");
+    Serial.println(client.getServerUrl());
+  } else {
+    Serial.print("InfluxDB connection failed: ");
+    Serial.println(client.getLastErrorMessage());
+  }
+}
+
+
+// Queries WiFi signal level values bellow a certain threshold using parameters inserted into the Flux query
+// Prints composed query and the result values.
+void loop() {
+  // Prepare query parameters
+  QueryParams params;
+  params.add("bucket", INFLUXDB_BUCKET);
+  params.add("since", "-5m");
+  params.add("device", DEVICE);
+  params.add("rssiTreshold", -50);
+  
+  // Construct a Flux query using parameters
+  // Parameters are accessed via the 'params' Flux object
+  // Flux only supports only string, float and int as parameters. Duration can be converted from string.
+  // Query will find RSSI less than defined treshold
+  String query = "from(bucket: params.bucket) |> range(start: duration(v: params.since)) \
+    |> filter(fn: (r) => r._measurement == \"wifi_status\") \
+    |> filter(fn: (r) => r._field == \"rssi\") \
+    |> filter(fn: (r) => r.device == params.device) \
+    |> filter(fn: (r) => r._value < params.rssiTreshold)";
+
+  // Print ouput header
+  // Print composed query
+  Serial.print("Querying with: ");
+  Serial.println(query);
+
+  // Send query to the server and get result
+  FluxQueryResult result = client.query(query, params);
+
+  //Print header
+  Serial.printf("%10s %20s %5s\n","Time","SSID","RSSI");
+
+  for(int i=0;i<37;i++) {
+    Serial.print('-');
+  }
+  Serial.println();
+
+  // Iterate over rows. Even there is just one row, next() must be called at least once.
+  int c = 0;
+  while (result.next()) {
+    // Get converted value for flux result column 'SSID'
+    String ssid = result.getValueByName("SSID").getString();
+   
+    // Get converted value for flux result column '_value' where there is RSSI value
+    long rssi = result.getValueByName("_value").getLong();
+
+    // Get converted value for the _time column
+    FluxDateTime time = result.getValueByName("_time").getDateTime();
+
+    // Format date-time for printing
+    // Format string according to http://www.cplusplus.com/reference/ctime/strftime/
+    String timeStr = time.format("%F %T");
+    // Print formatted row
+    Serial.printf("%20s %10s %5d\n", timeStr.c_str(), ssid.c_str() ,rssi);
+    c++;
+  }
+  if(!c) {
+    Serial.println(" No data found");
+  }
+
+  // Check if there was an error
+  if(result.getError() != "") {
+    Serial.print("Query result error: ");
+    Serial.println(result.getError());
+  }
+
+  // Close the result
+  result.close();
+  // Wait 15s
+  delay(15000);
+}

firmware/libraries/ESP8266_Influxdb/examples/QueryTable/QueryTable.ino

@@ -0,0 +1,148 @@
+/**
+ * QueryTable Example code for InfluxDBClient library for Arduino.
+ * 
+ * This example demonstrates querying recent history of values of WiFi signal level measured and stored in BasicWrite and SecureWrite examples.
+ * 
+ * Demonstrates connection to any InfluxDB instance accesible via:
+ *  - unsecured http://...
+ *  - secure https://... (appropriate certificate is required)
+ *  - InfluxDB 2 Cloud at https://cloud2.influxdata.com/ (certificate is preconfigured)
+ * 
+ *  Enter WiFi and InfluxDB parameters below
+ **/
+
+#if defined(ESP32)
+#include <WiFiMulti.h>
+WiFiMulti wifiMulti;
+#define DEVICE "ESP32"
+#elif defined(ESP8266)
+#include <ESP8266WiFiMulti.h>
+ESP8266WiFiMulti wifiMulti;
+#define DEVICE "ESP8266"
+#endif
+
+#include <InfluxDbClient.h>
+#include <InfluxDbCloud.h>
+
+// WiFi AP SSID
+#define WIFI_SSID "SSID"
+// WiFi password
+#define WIFI_PASSWORD "PASSWORD"
+// InfluxDB v2 server url, e.g. https://eu-central-1-1.aws.cloud2.influxdata.com (Use: InfluxDB UI -> Load Data -> Client Libraries)
+// InfluxDB 1.8+  (v2 compatibility API) server url, e.g. http://192.168.1.48:8086
+#define INFLUXDB_URL "server-url"
+// InfluxDB v2 server or cloud API authentication token (Use: InfluxDB UI -> Load Data -> Tokens -> <select token>)
+// InfluxDB 1.8+ (v2 compatibility API) use form user:password, eg. admin:adminpass
+#define INFLUXDB_TOKEN "server token"
+// InfluxDB v2 organization name or id (Use: InfluxDB UI -> Settings -> Profile -> <name under tile> )
+// InfluxDB 1.8+ (v2 compatibility API) use any non empty string
+#define INFLUXDB_ORG "org name/id"
+// InfluxDB v2 bucket name (Use: InfluxDB UI -> Load Data -> Buckets)
+// InfluxDB 1.8+ (v2 compatibility API) use database name
+#define INFLUXDB_BUCKET "bucket name"
+
+// Set timezone string according to https://www.gnu.org/software/libc/manual/html_node/TZ-Variable.html
+// Examples:
+//  Pacific Time: "PST8PDT"
+//  Eastern: "EST5EDT"
+//  Japanesse: "JST-9"
+//  Central Europe: "CET-1CEST,M3.5.0,M10.5.0/3"
+#define TZ_INFO "CET-1CEST,M3.5.0,M10.5.0/3"
+
+// InfluxDB client instance with preconfigured InfluxCloud certificate
+InfluxDBClient client(INFLUXDB_URL, INFLUXDB_ORG, INFLUXDB_BUCKET, INFLUXDB_TOKEN, InfluxDbCloud2CACert);
+
+void setup() {
+  Serial.begin(115200);
+
+  // Setup wifi
+  WiFi.mode(WIFI_STA);
+  wifiMulti.addAP(WIFI_SSID, WIFI_PASSWORD);
+
+  Serial.print("Connecting to wifi");
+  while (wifiMulti.run() != WL_CONNECTED) {
+    Serial.print(".");
+    delay(500);
+  }
+  Serial.println();
+
+  // Accurate time is necessary for certificate validation
+  // For the fastest time sync find NTP servers in your area: https://www.pool.ntp.org/zone/
+  // Syncing progress and the time will be printed to Serial
+  timeSync(TZ_INFO, "pool.ntp.org", "time.nis.gov");
+
+  // Check server connection
+  if (client.validateConnection()) {
+    Serial.print("Connected to InfluxDB: ");
+    Serial.println(client.getServerUrl());
+  } else {
+    Serial.print("InfluxDB connection failed: ");
+    Serial.println(client.getLastErrorMessage());
+  }
+}
+
+void loop() {
+  // Construct a Flux query
+  // Query will list RSSI for last 24 hours for each connected WiFi network of this device type
+  String query = "from(bucket: \"" INFLUXDB_BUCKET "\") |> range(start: -24h) |> filter(fn: (r) => r._measurement == \"wifi_status\" and r._field == \"rssi\"";
+  query += " and r.device == \""  DEVICE  "\")";
+
+  Serial.println("==== List results ====");
+  
+  // Print composed query
+  Serial.print("Querying with: ");
+  Serial.println(query);
+
+  // Send query to the server and get result
+  FluxQueryResult result = client.query(query);
+
+  // Iterate over rows. Even there is just one row, next() must be called at least once.
+  while (result.next()) {
+    // Check for new grouping key
+    if(result.hasTableChanged()) {
+      Serial.println("Table:");
+      Serial.print("  ");
+      // Print all columns name
+      for(String &name: result.getColumnsName()) {
+        Serial.print(name);
+        Serial.print(",");
+      }
+      Serial.println();
+      Serial.print("  ");
+      // Print all columns datatype
+      for(String &tp: result.getColumnsDatatype()) {
+        Serial.print(tp);
+        Serial.print(",");
+      }
+      Serial.println();
+    }
+    Serial.print("  ");
+    // Print values of the row
+    for(FluxValue &val: result.getValues()) {
+      // Check whether the value is null
+      if(!val.isNull()) {
+        // Use raw string, unconverted value
+        Serial.print(val.getRawValue());
+      } else {
+        // Print null value substite
+        Serial.print("<null>");  
+      }
+      Serial.print(",");
+    }
+    Serial.println();
+  }
+
+  // Check if there was an error
+  if(result.getError().length() > 0) {
+    Serial.print("Query result error: ");
+    Serial.println(result.getError());
+  }
+
+  // Close the result
+  result.close();
+
+  //Wait 10s
+  Serial.println("Wait 10s");
+  delay(10000);
+}
+

firmware/libraries/ESP8266_Influxdb/examples/SecureBatchWrite/SecureBatchWrite.ino

@@ -0,0 +1,167 @@
+/**
+ * Secure Write Example code for InfluxDBClient library for Arduino
+ * Enter WiFi and InfluxDB parameters below
+ *
+ * Demonstrates connection to any InfluxDB instance accesible via:
+ *  - unsecured http://...
+ *  - secure https://... (appropriate certificate is required)
+ *  - InfluxDB 2 Cloud at https://cloud2.influxdata.com/ (certificate is preconfigured)
+ * Measures signal level of all visible WiFi networks including signal level of the actually connected one
+ * This example demonstrates time handling, how to write measures with different priorities, batching and retry
+ * Data can be immediately seen in a InfluxDB 2 Cloud UI - measurements wifi_status and wifi_networks
+ **/
+
+#if defined(ESP32)
+#include <WiFiMulti.h>
+WiFiMulti wifiMulti;
+#define DEVICE "ESP32"
+#elif defined(ESP8266)
+#include <ESP8266WiFiMulti.h>
+ESP8266WiFiMulti wifiMulti;
+#define DEVICE "ESP8266"
+#define WIFI_AUTH_OPEN ENC_TYPE_NONE
+#endif
+
+#include <InfluxDbClient.h>
+#include <InfluxDbCloud.h>
+
+// WiFi AP SSID
+#define WIFI_SSID "SSID"
+// WiFi password
+#define WIFI_PASSWORD "PASSWORD"
+// InfluxDB v2 server url, e.g. https://eu-central-1-1.aws.cloud2.influxdata.com (Use: InfluxDB UI -> Load Data -> Client Libraries)
+#define INFLUXDB_URL "server-url"
+// InfluxDB v2 server or cloud API authentication token (Use: InfluxDB UI -> Load Data -> Tokens -> <select token>)
+#define INFLUXDB_TOKEN "server token"
+// InfluxDB v2 organization id (Use: InfluxDB UI -> Settings -> Profile -> <name under tile> )
+#define INFLUXDB_ORG "org id"
+// InfluxDB v2 bucket name (Use: InfluxDB UI -> Load Data -> Buckets)
+#define INFLUXDB_BUCKET "bucket name"
+// Set timezone string according to https://www.gnu.org/software/libc/manual/html_node/TZ-Variable.html
+// Examples:
+//  Pacific Time:   "PST8PDT"
+//  Eastern:        "EST5EDT"
+//  Japanesse:      "JST-9"
+//  Central Europe: "CET-1CEST,M3.5.0,M10.5.0/3"
+#define TZ_INFO "CET-1CEST,M3.5.0,M10.5.0/3"
+// NTP servers the for time synchronization.
+// For the fastest time sync find NTP servers in your area: https://www.pool.ntp.org/zone/
+#define NTP_SERVER1  "pool.ntp.org"
+#define NTP_SERVER2  "time.nis.gov"
+#define WRITE_PRECISION WritePrecision::S
+#define MAX_BATCH_SIZE 10
+#define WRITE_BUFFER_SIZE 30
+
+// InfluxDB client instance with preconfigured InfluxCloud certificate
+InfluxDBClient client(INFLUXDB_URL, INFLUXDB_ORG, INFLUXDB_BUCKET, INFLUXDB_TOKEN, InfluxDbCloud2CACert);
+// InfluxDB client instance without preconfigured InfluxCloud certificate for insecure connection 
+//InfluxDBClient client(INFLUXDB_URL, INFLUXDB_ORG, INFLUXDB_BUCKET, INFLUXDB_TOKEN);
+
+// Data point
+Point sensorStatus("wifi_status");
+
+// Number for loops to sync time using NTP
+int iterations = 0;
+
+void setup() {
+  Serial.begin(115200);
+
+  // Setup wifi
+  WiFi.mode(WIFI_STA);
+  wifiMulti.addAP(WIFI_SSID, WIFI_PASSWORD);
+
+  Serial.print("Connecting to wifi");
+  while (wifiMulti.run() != WL_CONNECTED) {
+    Serial.print(".");
+    delay(500);
+  }
+  Serial.println();
+
+  // Add tags
+  sensorStatus.addTag("device", DEVICE);
+  sensorStatus.addTag("SSID", WiFi.SSID());
+
+  // Alternatively, set insecure connection to skip server certificate validation 
+  //client.setInsecure();
+
+  // Accurate time is necessary for certificate validation and writing in batches
+  // Syncing progress and the time will be printed to Serial.
+  timeSync(TZ_INFO, NTP_SERVER1, NTP_SERVER2);
+
+  // Check server connection
+  if (client.validateConnection()) {
+    Serial.print("Connected to InfluxDB: ");
+    Serial.println(client.getServerUrl());
+  } else {
+    Serial.print("InfluxDB connection failed: ");
+    Serial.println(client.getLastErrorMessage());
+  }
+
+  // Enable messages batching and retry buffer
+  client.setWriteOptions(WriteOptions().writePrecision(WRITE_PRECISION).batchSize(MAX_BATCH_SIZE).bufferSize(WRITE_BUFFER_SIZE));
+}
+
+void loop() {
+  // Sync time for batching once per hour
+  if (iterations++ >= 360) {
+    timeSync(TZ_INFO, NTP_SERVER1, NTP_SERVER2);
+    iterations = 0;
+  }
+
+  // Report networks (low priority data) just in case we successfully wrote the previous batch
+  if (client.isBufferEmpty()) {
+    // Report all the detected wifi networks
+    int networks = WiFi.scanNetworks();
+    // Set identical time for the whole network scan
+    time_t tnow = time(nullptr);
+    for (int i = 0; i < networks; i++) {
+      Point sensorNetworks("wifi_networks");
+      sensorNetworks.addTag("device", DEVICE);
+      sensorNetworks.addTag("SSID", WiFi.SSID(i));
+      sensorNetworks.addTag("channel", String(WiFi.channel(i)));
+      sensorNetworks.addTag("open", String(WiFi.encryptionType(i) == WIFI_AUTH_OPEN));
+      sensorNetworks.addField("rssi", WiFi.RSSI(i));
+      sensorNetworks.setTime(tnow);  //set the time
+
+      // Print what are we exactly writing
+      Serial.print("Writing: ");
+      Serial.println(client.pointToLineProtocol(sensorNetworks));
+
+      // Write point into buffer - low priority measures
+      client.writePoint(sensorNetworks);
+    }
+  } else
+    Serial.println("Wifi networks reporting skipped due to communication issues");
+
+  // Report RSSI of currently connected network
+  sensorStatus.setTime(time(nullptr));
+  sensorStatus.addField("rssi", WiFi.RSSI());
+
+  // Print what are we exactly writing
+  Serial.print("Writing: ");
+  Serial.println(client.pointToLineProtocol(sensorStatus));
+
+  // Write point into buffer - high priority measure
+  client.writePoint(sensorStatus);
+
+  // Clear fields for next usage. Tags remain the same.
+  sensorStatus.clearFields();
+
+  // If no Wifi signal, try to reconnect it
+  if (wifiMulti.run() != WL_CONNECTED) {
+    Serial.println("Wifi connection lost");
+  }
+
+  // End of the iteration - force write of all the values into InfluxDB as single transaction
+  Serial.println("Flushing data into InfluxDB");
+  if (!client.flushBuffer()) {
+    Serial.print("InfluxDB flush failed: ");
+    Serial.println(client.getLastErrorMessage());
+    Serial.print("Full buffer: ");
+    Serial.println(client.isBufferFull() ? "Yes" : "No");
+  }
+
+  // Wait 10s
+  Serial.println("Wait 10s");
+  delay(10000);
+}

firmware/libraries/ESP8266_Influxdb/examples/SecureWrite/SecureWrite.ino

@@ -0,0 +1,113 @@
+/**
+ * Secure Write Example code for InfluxDBClient library for Arduino
+ * Enter WiFi and InfluxDB parameters below
+ *
+ * Demonstrates connection to any InfluxDB instance accesible via:
+ *  - unsecured http://...
+ *  - secure https://... (appropriate certificate is required)
+ *  - InfluxDB 2 Cloud at https://cloud2.influxdata.com/ (certificate is preconfigured)
+ * Measures signal level of the actually connected WiFi network
+ * This example demonstrates time handling, secure connection and measurement writing into InfluxDB
+ * Data can be immediately seen in a InfluxDB 2 Cloud UI - measurement wifi_status
+ **/
+
+#if defined(ESP32)
+#include <WiFiMulti.h>
+WiFiMulti wifiMulti;
+#define DEVICE "ESP32"
+#elif defined(ESP8266)
+#include <ESP8266WiFiMulti.h>
+ESP8266WiFiMulti wifiMulti;
+#define DEVICE "ESP8266"
+#endif
+
+#include <InfluxDbClient.h>
+#include <InfluxDbCloud.h>
+
+// WiFi AP SSID
+#define WIFI_SSID "SSID"
+// WiFi password
+#define WIFI_PASSWORD "PASSWORD"
+// InfluxDB v2 server url, e.g. https://eu-central-1-1.aws.cloud2.influxdata.com (Use: InfluxDB UI -> Load Data -> Client Libraries)
+#define INFLUXDB_URL "server-url"
+// InfluxDB v2 server or cloud API authentication token (Use: InfluxDB UI -> Load Data -> Tokens -> <select token>)
+#define INFLUXDB_TOKEN "server token"
+// InfluxDB v2 organization id (Use: InfluxDB UI -> Settings -> Profile -> <name under tile> )
+#define INFLUXDB_ORG "org id"
+// InfluxDB v2 bucket name (Use: InfluxDB UI -> Load Data -> Buckets)
+#define INFLUXDB_BUCKET "bucket name"
+
+// Set timezone string according to https://www.gnu.org/software/libc/manual/html_node/TZ-Variable.html
+// Examples:
+//  Pacific Time: "PST8PDT"
+//  Eastern: "EST5EDT"
+//  Japanesse: "JST-9"
+//  Central Europe: "CET-1CEST,M3.5.0,M10.5.0/3"
+#define TZ_INFO "CET-1CEST,M3.5.0,M10.5.0/3"
+
+// InfluxDB client instance with preconfigured InfluxCloud certificate
+InfluxDBClient client(INFLUXDB_URL, INFLUXDB_ORG, INFLUXDB_BUCKET, INFLUXDB_TOKEN, InfluxDbCloud2CACert);
+// InfluxDB client instance without preconfigured InfluxCloud certificate for insecure connection 
+//InfluxDBClient client(INFLUXDB_URL, INFLUXDB_ORG, INFLUXDB_BUCKET, INFLUXDB_TOKEN);
+
+// Data point
+Point sensor("wifi_status");
+
+void setup() {
+  Serial.begin(115200);
+
+  // Setup wifi
+  WiFi.mode(WIFI_STA);
+  wifiMulti.addAP(WIFI_SSID, WIFI_PASSWORD);
+
+  Serial.print("Connecting to wifi");
+  while (wifiMulti.run() != WL_CONNECTED) {
+    Serial.print(".");
+    delay(500);
+  }
+  Serial.println();
+
+  // Add tags
+  sensor.addTag("device", DEVICE);
+  sensor.addTag("SSID", WiFi.SSID());
+
+  // Alternatively, set insecure connection to skip server certificate validation 
+  //client.setInsecure();
+
+  // Accurate time is necessary for certificate validation and writing in batches
+  // For the fastest time sync find NTP servers in your area: https://www.pool.ntp.org/zone/
+  // Syncing progress and the time will be printed to Serial.
+  timeSync(TZ_INFO, "pool.ntp.org", "time.nis.gov");
+
+  // Check server connection
+  if (client.validateConnection()) {
+    Serial.print("Connected to InfluxDB: ");
+    Serial.println(client.getServerUrl());
+  } else {
+    Serial.print("InfluxDB connection failed: ");
+    Serial.println(client.getLastErrorMessage());
+  }
+}
+
+void loop() {
+  // Store measured value into point
+  sensor.clearFields();
+  // Report RSSI of currently connected network
+  sensor.addField("rssi", WiFi.RSSI());
+  // Print what are we exactly writing
+  Serial.print("Writing: ");
+  Serial.println(client.pointToLineProtocol(sensor));
+  // If no Wifi signal, try to reconnect it
+  if (wifiMulti.run() != WL_CONNECTED) {
+    Serial.println("Wifi connection lost");
+  }
+  // Write point
+  if (!client.writePoint(sensor)) {
+    Serial.print("InfluxDB write failed: ");
+    Serial.println(client.getLastErrorMessage());
+  }
+
+  //Wait 10s
+  Serial.println("Wait 10s");
+  delay(10000);
+}

firmware/libraries/ESP8266_Influxdb/keywords.txt

@@ -0,0 +1,45 @@
+# Syntax Coloring Map For InfluxDBClient library
+
+# Datatypes (KEYWORD1)
+WritePrecision   KEYWORD1
+Point		     KEYWORD1
+InfluxDBClient 	 KEYWORD1
+InfluxData	     KEYWORD1
+Influxdb	     KEYWORD1
+FluxValue	     KEYWORD1
+FluxQueryResult  KEYWORD1
+FluxDateTime     KEYWORD1
+
+# Methods and Functions (KEYWORD2)
+addTag 	                KEYWORD2
+addField                KEYWORD2
+setTime	 	            KEYWORD2
+clearFields	            KEYWORD2
+clearTags	            KEYWORD2
+hasFields	            KEYWORD2
+hasTags	                KEYWORD2
+hasTime                 KEYWORD2
+toLineProtocol          KEYWORD2
+setWriteOptions         KEYWORD2
+validateConnection      KEYWORD2
+writeRecord             KEYWORD2
+writePoint              KEYWORD2
+query                   KEYWORD2
+flushBuffer             KEYWORD2
+isBufferFull            KEYWORD2
+isBufferEmpty           KEYWORD2
+checkBuffer             KEYWORD2
+getLastStatusCode       KEYWORD2
+resetBuffer             KEYWORD2
+getLastErrorMessage     KEYWORD2
+getServerUrl            KEYWORD2
+setDb	                KEYWORD2
+prepare	                KEYWORD2
+write	                KEYWORD2
+
+# Constants (LITERAL1)
+NoTime  LITERAL1
+S       LITERAL1
+MS      LITERAL1
+US      LITERAL1
+NS      LITERAL1

firmware/libraries/ESP8266_Influxdb/library.properties

@@ -0,0 +1,10 @@
+name=ESP8266 Influxdb 
+version=3.12.1
+author=Tobias Schürg, InfluxData
+maintainer=Tobias Schürg, InfluxData
+sentence=InfluxDB Client for Arduino. 
+url=https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino
+paragraph=This library allows writing and reading data from InfluxDB server or InfluxDB Cloud. Supports authentication, secure communication over TLS, batching and retrying.
+category=Data Storage
+architectures=*
+includes=InfluxDbClient.h

firmware/libraries/ESP8266_Influxdb/platformio.ini

@@ -0,0 +1,45 @@
+; CanAirIO Sensorlib
+;
+; Full guide and details: https://github.com/kike-canaries/canairio_sensorlib
+
+
+[platformio]
+src_dir = ./test/
+
+[env]
+framework = arduino
+upload_speed = 1500000
+monitor_speed = 115200
+monitor_filters = time
+build_flags =
+    -D CORE_DEBUG_LEVEL=0
+lib_deps =
+    https://github.com/tobiasschuerg/InfluxDB-Client-for-Arduino.git
+
+[esp32_common]
+platform = espressif32
+board = esp32dev
+framework = ${env.framework}
+upload_speed = ${env.upload_speed}
+monitor_speed = ${env.monitor_speed}
+lib_deps = ${env.lib_deps}
+build_flags =
+    ${env.build_flags}
+
+[esp8266_common]
+platform = espressif8266
+framework = ${env.framework}
+board = esp12e
+monitor_speed = ${env.monitor_speed}
+build_flags =
+    ${env.build_flags}
+lib_deps = 
+    ${env.lib_deps}
+
+[env:esp8266BasicTest]
+extends = esp8266_common
+
+[env:esp32BasicTest]
+extends = esp32_common
+
+

firmware/libraries/ESP8266_Influxdb/src/BucketsClient.cpp

@@ -0,0 +1,244 @@
+/**
+ * 
+ * BucketsClient.cpp: InfluxDB Buckets Client
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2020 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#include "BucketsClient.h"
+#include "util/helpers.h"
+
+#include "util/debug.h"
+
+static const char *propTemplate PROGMEM = "\"%s\":";
+// Finds first id property from JSON response
+enum class PropType {
+  String,
+  Number
+};
+
+static String findProperty(const char *prop,const String &json, PropType type = PropType::String);
+
+static String findProperty(const char *prop,const String &json, PropType type) {
+  INFLUXDB_CLIENT_DEBUG("[D] Searching for %s in %s\n", prop, json.c_str());
+  int propLen = strlen_P(propTemplate)+strlen(prop)-2;
+  char *propSearch = new char[propLen+1];
+  sprintf_P(propSearch, propTemplate, prop);
+  int i = json.indexOf(propSearch);
+  delete [] propSearch;
+  if(i>-1) {
+    INFLUXDB_CLIENT_DEBUG("[D]   Found at %d\n", i);
+    switch(type) {
+      case PropType::String:
+        i = json.indexOf("\"", i+propLen);
+        if(i>-1) {
+         INFLUXDB_CLIENT_DEBUG("[D]    Found starting \" at %d\n", i);
+          int e = json.indexOf("\"", i+1);
+          if(e>-1) {
+            INFLUXDB_CLIENT_DEBUG("[D]    Found ending \" at %d\n", e);
+            return json.substring(i+1, e);
+          }
+        }
+      break;
+      case PropType::Number:
+        i = i+propLen;
+        while(json[i] == ' ') {
+          i++;
+        }
+        INFLUXDB_CLIENT_DEBUG("[D]    Found beginning of number at %d\n", i);
+        int e = json.indexOf(",", i+1);
+        if(e>-1) {
+          INFLUXDB_CLIENT_DEBUG("[D]    Found , at %d\n", e);
+          return json.substring(i, e);
+        }
+      break;
+    }
+  }
+  return "";
+}
+
+char *copyChars(const char *str) {
+  char *ret = new char[strlen(str)+1];
+  strcpy(ret, str);
+  return ret;
+}
+
+Bucket::Bucket():_data(nullptr) {
+}
+
+Bucket::Bucket(const char *id, const char *name, const uint32_t expire) {
+  _data = std::make_shared<Data>(id, name, expire);
+}
+
+Bucket::Bucket(const Bucket &other) {
+    _data = other._data;
+}
+
+Bucket& Bucket::operator=(const Bucket& other) {
+    if(this != &other) {
+        _data = other._data;
+    }
+    return *this;
+}
+
+Bucket::~Bucket() {
+}
+
+
+Bucket::Data::Data(const char *id, const char *name, const uint32_t expire) {
+  this->id = copyChars(id);
+  this->name = copyChars(name);
+  this->expire = expire;
+}
+
+Bucket::Data::~Data() {
+  delete [] id;
+  delete [] name;
+}
+
+
+const char *toStringTmplt PROGMEM = "Bucket: ID %s, Name %s, expire %u";
+String Bucket::toString() const {
+  int len = strlen_P(toStringTmplt) + (_data?strlen(_data->name):0) + (_data?strlen(_data->id):0) + 10 + 1; //10 is maximum length of string representation of expire
+  char *buff = new char[len];
+  sprintf_P(buff, toStringTmplt, getID(), getName(), getExpire());
+  String ret = buff;
+  return ret;
+}
+
+BucketsClient::BucketsClient() {
+  _data = nullptr;
+}
+
+BucketsClient::BucketsClient(ConnectionInfo *pConnInfo, HTTPService *service) {
+  _data = std::make_shared<Data>(pConnInfo, service);
+}
+
+BucketsClient::BucketsClient(const BucketsClient &other) {
+  _data = other._data;
+}
+
+BucketsClient &BucketsClient::operator=(const BucketsClient &other) {
+  if(this != &other) {
+        _data = other._data;
+    }
+    return *this;
+}
+
+BucketsClient &BucketsClient::operator=(std::nullptr_t) {
+  _data = nullptr;
+  return *this;
+}
+
+String BucketsClient::getOrgID(const char *org) {
+  if(!_data) {
+    return "";
+  }
+  if(isValidID(org)) {
+    return org;
+  }
+  String url = _data->pService->getServerAPIURL();
+  url += "orgs?org=";
+  url += urlEncode(org);
+  String id;
+  INFLUXDB_CLIENT_DEBUG("[D] getOrgID: url %s\n", url.c_str());
+  _data->pService->doGET(url.c_str(), 200, [&id](HTTPClient *client){
+    id = findProperty("id",client->getString());
+    return true;
+  });
+  return id;
+}
+
+bool BucketsClient::checkBucketExists(const char *bucketName) {
+  Bucket b = findBucket(bucketName);
+  return !b.isNull();
+}
+
+static const char *CreateBucketTemplate PROGMEM = "{\"name\":\"%s\",\"orgID\":\"%s\",\"retentionRules\":[{\"everySeconds\":%u}]}";
+
+Bucket BucketsClient::createBucket(const char *bucketName, uint32_t expiresSec) {
+  Bucket b;
+  if(_data) {
+    String orgID = getOrgID(_data->pConnInfo->org.c_str());
+    
+    if(!orgID.length()) {
+      return b;
+    }
+    int expireLen = 0;
+    uint32_t e = expiresSec; 
+    do {
+      expireLen++;
+      e /=10;
+    } while(e > 0);
+    int len = strlen_P(CreateBucketTemplate) + strlen(bucketName) + orgID.length() + expireLen+1;
+    char *body = new char[len];
+    sprintf_P(body, CreateBucketTemplate, bucketName, orgID.c_str(), expiresSec);
+    String url = _data->pService->getServerAPIURL();
+    url += "buckets";
+    INFLUXDB_CLIENT_DEBUG("[D] CreateBucket: url %s, body %s\n", url.c_str(), body);
+    _data->pService->doPOST(url.c_str(), body, "application/json", 201, [&b](HTTPClient *client){
+      String resp = client->getString();
+      String id = findProperty("id", resp);
+      String name = findProperty("name", resp);
+      String expireStr = findProperty("everySeconds", resp, PropType::Number);
+      uint32_t expire = strtoul(expireStr.c_str(), nullptr, 10);
+      b = Bucket(id.c_str(), name.c_str(), expire);
+      return true;
+    });
+    delete [] body;
+  }
+  return b;
+}
+
+bool BucketsClient::deleteBucket(const char *id) {
+  if(!_data) {
+    
+    return false;
+  }
+  String url = _data->pService->getServerAPIURL();
+  url += "buckets/";
+  url += id;
+  INFLUXDB_CLIENT_DEBUG("[D] deleteBucket: url %s\n", url.c_str());
+  return _data->pService->doDELETE(url.c_str(), 204, nullptr);
+}
+
+Bucket BucketsClient::findBucket(const char *bucketName) {
+  Bucket b;
+  if(_data) {
+    String url = _data->pService->getServerAPIURL();
+    url += "buckets?name=";
+    url += urlEncode(bucketName);
+    INFLUXDB_CLIENT_DEBUG("[D] findBucket: url %s\n", url.c_str());
+    _data->pService->doGET(url.c_str(), 200, [&b](HTTPClient *client){
+      String resp = client->getString();
+      String id = findProperty("id", resp);
+      if(id.length()) {
+        String name = findProperty("name", resp);
+        String expireStr = findProperty("everySeconds", resp, PropType::Number);
+        uint32_t expire = strtoul(expireStr.c_str(), nullptr, 10);
+        b = Bucket(id.c_str(), name.c_str(), expire);
+      }
+      return true;
+    });
+  }
+  return b;
+}

firmware/libraries/ESP8266_Influxdb/src/BucketsClient.h

@@ -0,0 +1,122 @@
+/**
+ * 
+ * BucketsClient.h: InfluxDB Buckets Client
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2020 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#ifndef _BUCKETS_CLIENT_H_
+#define _BUCKETS_CLIENT_H_
+
+#include <HTTPService.h>
+#include <memory>
+
+class BucketsClient;
+class Test;
+/**
+ * Bucket represents a bucket in the InfluxDB 2 server
+ **/
+class Bucket {
+friend class BucketsClient;  
+friend class Test;
+  public:
+      // Create empty, invalid, bucket instance
+    Bucket();
+    // Create a bucket instance   
+    Bucket(const char *id, const char *name, const uint32_t expire);
+    // Copy constructor
+    Bucket(const Bucket &other);
+    // Assignment operator
+    Bucket &operator=(const Bucket &other);
+    // for testing validity
+    operator bool() const { return !isNull(); }
+    // Clean bucket 
+    ~Bucket();
+    // Returns Bucket ID
+    const char *getID() const { return _data?_data->id:nullptr; }
+    // Retuns bucket name
+    const char *getName() const { return _data?_data->name:nullptr; }
+    // Retention policy in sec, 0 - inifinite
+    uint32_t getExpire() const { return _data?_data->expire:0; }
+    // Checks if it is null instance
+    bool isNull() const { return _data == nullptr; }
+    // String representation
+    String toString() const;
+  private:
+    class Data {
+      public:
+        Data(const char *id, const char *name, const uint32_t expire);
+        ~Data();
+        char *id;
+        char *name;
+        uint32_t expire;
+      };
+    std::shared_ptr<Data> _data;
+};
+
+class InfluxDBClient;
+class E2ETest;
+
+/**
+ * BucketsClient is a client for managing buckets in the InfluxDB 2 server
+ * A new bucket can be created, or a bucket can be checked for existence by its name.
+ * A bucket can be also deleted.
+ **/
+class BucketsClient {
+friend class InfluxDBClient;
+friend class Test;
+friend class E2ETest;
+  public:
+    // Copy contructor
+    BucketsClient(const BucketsClient &other);
+    // Assignment operator
+    BucketsClient &operator=(const BucketsClient &other);
+    // nullptr assignment for clearing
+    BucketsClient &operator=(std::nullptr_t);
+    // for testing validity
+    operator bool() const { return !isNull(); }
+    // Returns true if a bucket exists
+    bool checkBucketExists(const char *bucketName);
+    // Returns a Bucket instance if a bucket is found.
+    Bucket findBucket(const char *bucketName);
+    // Creates a bucket with given name and optional retention policy. 0 means infinite.
+    Bucket createBucket(const char *bucketName, uint32_t expiresSec = 0);
+    // Delete a bucket with given id. Use findBucket to get a bucket with id.
+    bool deleteBucket(const char *id);
+    // Returns last error message 
+    String getLastErrorMessage() { return _data?_data->pConnInfo->lastError:""; }
+    // check validity
+    bool isNull() const { return _data == nullptr; }
+  protected:
+    BucketsClient();
+    BucketsClient(ConnectionInfo *pConnInfo, HTTPService *service);
+    String getOrgID(const char *org);
+  private:    
+    class Data {
+      public:
+        Data(ConnectionInfo *pConnInfo, HTTPService *pService):pConnInfo(pConnInfo),pService(pService) {};
+        ConnectionInfo *pConnInfo;
+        HTTPService *pService;
+      };
+    std::shared_ptr<Data> _data;
+};
+#endif

firmware/libraries/ESP8266_Influxdb/src/HTTPService.cpp

@@ -0,0 +1,220 @@
+
+#include "HTTPService.h"
+#include "Platform.h"
+#include "Version.h"
+
+#include "util/debug.h"
+
+static const char UserAgent[] PROGMEM = "influxdb-client-arduino/" INFLUXDB_CLIENT_VERSION " (" INFLUXDB_CLIENT_PLATFORM " " INFLUXDB_CLIENT_PLATFORM_VERSION ")";
+
+#if defined(ESP8266)         
+bool checkMFLN(BearSSL::WiFiClientSecure  *client, String url);
+#endif
+
+// This cannot be put to PROGMEM due to the way how it is used
+static const char *RetryAfter = "Retry-After";
+const char *TransferEncoding = "Transfer-Encoding";
+
+HTTPService::HTTPService(ConnectionInfo *pConnInfo):_pConnInfo(pConnInfo) {
+  _apiURL = pConnInfo->serverUrl;
+  _apiURL += "/api/v2/";
+  bool https = pConnInfo->serverUrl.startsWith("https");
+  if(https) {
+#if defined(ESP8266)         
+    BearSSL::WiFiClientSecure *wifiClientSec = new BearSSL::WiFiClientSecure;
+    if (pConnInfo->insecure) {
+      wifiClientSec->setInsecure();
+    } else if(pConnInfo->certInfo && strlen_P(pConnInfo->certInfo) > 0) {
+      if(strlen_P(pConnInfo->certInfo) > 60 ) { //differentiate fingerprint and cert
+         _cert = new BearSSL::X509List(pConnInfo->certInfo); 
+         wifiClientSec->setTrustAnchors(_cert);
+      } else {
+         wifiClientSec->setFingerprint(pConnInfo->certInfo);
+      }
+    }
+    checkMFLN(wifiClientSec, pConnInfo->serverUrl);
+#elif defined(ESP32)
+    WiFiClientSecure *wifiClientSec = new WiFiClientSecure;  
+    if (pConnInfo->insecure) {
+#ifndef ARDUINO_ESP32_RELEASE_1_0_4
+      // This works only in ESP32 SDK 1.0.5 and higher
+      wifiClientSec->setInsecure();
+#endif            
+    } else if(pConnInfo->certInfo && strlen_P(pConnInfo->certInfo) > 0) { 
+      wifiClientSec->setCACert(pConnInfo->certInfo);
+    }
+#endif    
+    _wifiClient = wifiClientSec;
+  } else {
+    _wifiClient = new WiFiClient;
+  }
+  if(!_httpClient) {
+    _httpClient = new HTTPClient;
+  }
+  _httpClient->setReuse(_httpOptions._connectionReuse);
+
+  _httpClient->setUserAgent(FPSTR(UserAgent));
+};
+
+HTTPService::~HTTPService() {
+  if(_httpClient) {
+    delete _httpClient;
+    _httpClient = nullptr;
+  }
+  if(_wifiClient) {
+    delete _wifiClient;
+    _wifiClient = nullptr;
+  }
+#if defined(ESP8266)     
+  if(_cert) {
+    delete _cert;
+    _cert = nullptr;
+}
+#endif
+}
+
+
+void HTTPService::setHTTPOptions(const HTTPOptions & httpOptions) {
+    _httpOptions = httpOptions;
+    if(!_httpClient) {
+        _httpClient = new HTTPClient;
+    }
+    _httpClient->setReuse(_httpOptions._connectionReuse);
+    _httpClient->setTimeout(_httpOptions._httpReadTimeout);
+#if defined(ESP32) 
+     _httpClient->setConnectTimeout(_httpOptions._httpReadTimeout);
+#endif
+}
+
+// parse URL for host and port and call probeMaxFragmentLength
+#if defined(ESP8266)         
+bool checkMFLN(BearSSL::WiFiClientSecure  *client, String url) {
+    int index = url.indexOf(':');
+     if(index < 0) {
+        return false;
+    }
+    String protocol = url.substring(0, index);
+    int port = -1;
+    url.remove(0, (index + 3)); // remove http:// or https://
+
+    if (protocol == "http") {
+        // set default port for 'http'
+        port = 80;
+    } else if (protocol == "https") {
+        // set default port for 'https'
+        port = 443;
+    } else {
+        return false;
+    }
+    index = url.indexOf('/');
+    String host = url.substring(0, index);
+    url.remove(0, index); // remove host 
+    // check Authorization
+    index = host.indexOf('@');
+    if(index >= 0) {
+        host.remove(0, index + 1); // remove auth part including @
+    }
+    // get port
+    index = host.indexOf(':');
+    if(index >= 0) {
+        String portS = host;
+        host = host.substring(0, index); // hostname
+        portS.remove(0, (index + 1)); // remove hostname + :
+        port = portS.toInt(); // get port
+    }
+    INFLUXDB_CLIENT_DEBUG("[D] probeMaxFragmentLength to %s:%d\n", host.c_str(), port);
+    bool mfln = client->probeMaxFragmentLength(host, port, 1024);
+    INFLUXDB_CLIENT_DEBUG("[D]  MFLN:%s\n", mfln ? "yes" : "no");
+    if (mfln) {
+        client->setBufferSizes(1024, 1024);
+    } 
+    return mfln;
+}
+#endif //ESP8266
+
+bool HTTPService::beforeRequest(const char *url) {
+   if(!_httpClient->begin(*_wifiClient, url)) {
+    _pConnInfo->lastError = F("begin failed");
+    return false;
+  }
+  if(_pConnInfo->authToken.length() > 0) {
+    _httpClient->addHeader(F("Authorization"), "Token " + _pConnInfo->authToken);
+  }
+  const char * headerKeys[] = {RetryAfter, TransferEncoding} ;
+  _httpClient->collectHeaders(headerKeys, 2);
+  return true;
+}
+
+bool HTTPService::doPOST(const char *url, const char *data, const char *contentType, int expectedCode, httpResponseCallback cb) {
+  INFLUXDB_CLIENT_DEBUG("[D] POST request - %s, data: %dbytes, type %s\n", url, strlen(data), contentType);
+  if(!beforeRequest(url)) {
+    return false;
+  }
+  if(contentType) {
+    _httpClient->addHeader(F("Content-Type"), FPSTR(contentType));
+  }
+  _lastStatusCode = _httpClient->POST((uint8_t *) data, strlen(data));
+  return afterRequest(expectedCode, cb);
+}
+
+bool HTTPService::doPOST(const char *url, Stream *stream, const char *contentType, int expectedCode, httpResponseCallback cb) {
+  INFLUXDB_CLIENT_DEBUG("[D] POST request - %s, data: %dbytes, type %s\n", url, stream->available(), contentType);
+  if(!beforeRequest(url)) {
+    return false;
+  }
+  if(contentType) {
+    _httpClient->addHeader(F("Content-Type"), FPSTR(contentType));
+  }
+  _lastStatusCode = _httpClient->sendRequest("POST", stream, stream->available());
+  return afterRequest(expectedCode, cb);
+}
+
+bool HTTPService::doGET(const char *url, int expectedCode, httpResponseCallback cb) {
+  INFLUXDB_CLIENT_DEBUG("[D] GET request - %s\n", url);
+  if(!beforeRequest(url)) {
+    return false;
+  }
+  _lastStatusCode = _httpClient->GET();
+  return afterRequest(expectedCode, cb, false);
+}
+
+bool HTTPService::doDELETE(const char *url, int expectedCode, httpResponseCallback cb) {
+  INFLUXDB_CLIENT_DEBUG("[D] DELETE - %s\n", url);
+  if(!beforeRequest(url)) {
+    return false;
+  }
+  _lastStatusCode = _httpClient->sendRequest("DELETE");
+  return afterRequest(expectedCode, cb, false);
+}
+
+bool HTTPService::afterRequest(int expectedStatusCode, httpResponseCallback cb,  bool modifyLastConnStatus) {
+    if(modifyLastConnStatus) {
+        _lastRequestTime = millis();
+        INFLUXDB_CLIENT_DEBUG("[D] HTTP status code - %d\n", _lastStatusCode);
+        _lastRetryAfter = 0;
+        if(_lastStatusCode >= 429) { //retryable server errors
+            if(_httpClient->hasHeader(RetryAfter)) {
+                _lastRetryAfter = _httpClient->header(RetryAfter).toInt();
+                INFLUXDB_CLIENT_DEBUG("[D] Reply after - %d\n", _lastRetryAfter);
+            }
+        }
+    }
+    _pConnInfo->lastError = (char *)nullptr;
+    bool ret = _lastStatusCode == expectedStatusCode;
+    bool endConnection = true;
+    if(!ret) {
+        if(_lastStatusCode > 0) {
+            _pConnInfo->lastError = _httpClient->getString();
+            INFLUXDB_CLIENT_DEBUG("[D] Response:\n%s\n", _pConnInfo->lastError.c_str());
+        } else {
+            _pConnInfo->lastError = _httpClient->errorToString(_lastStatusCode);
+            INFLUXDB_CLIENT_DEBUG("[E] Error - %s\n", _pConnInfo->lastError.c_str());
+        }
+    } else if(cb){
+      endConnection = cb(_httpClient);
+    }
+    if(endConnection) {
+        _httpClient->end();
+    }
+    return ret;
+}

firmware/libraries/ESP8266_Influxdb/src/HTTPService.h

@@ -0,0 +1,136 @@
+/**
+ * 
+ * HTTPService.h: HTTP Service
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2020 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#ifndef _HTTP_SERVICE_H_
+#define _HTTP_SERVICE_H_
+
+#include <Arduino.h>
+#if defined(ESP8266)
+# include <WiFiClientSecureBearSSL.h>
+# include <ESP8266HTTPClient.h>
+#elif defined(ESP32)
+# include <HTTPClient.h>
+#else
+# error "This library currently supports only ESP8266 and ESP32."
+#endif
+#include "Options.h"
+
+
+class Test;
+typedef std::function<bool(HTTPClient *client)> httpResponseCallback;
+extern const char *TransferEncoding;
+
+struct ConnectionInfo {
+    // Connection info
+    String serverUrl;
+    // Write & query targets
+    String bucket;
+    String org;
+    // v2 authetication token
+    String authToken;
+    // Version of InfluxDB 1 or 2
+    uint8_t dbVersion;
+    // V1 user authetication
+    String user;
+    String password;
+    // Certificate info
+    const char *certInfo; 
+    // flag if https should ignore cert validation
+    bool insecure;
+    // Error message of last failed operation
+    String lastError;
+};
+
+/**
+ * HTTPService provides  HTTP methods for communicating with InfluxDBServer,
+ * while taking care of Authorization and error handling
+ **/
+class HTTPService {
+friend class Test;  
+  private:
+    // Connection info data
+    ConnectionInfo *_pConnInfo;    
+    // Server API URL
+    String _apiURL;
+    // Last time in ms we made are a request to server
+    uint32_t _lastRequestTime = 0;
+    // HTTP status code of last request to server
+    int _lastStatusCode = 0;
+    // Underlying HTTPClient instance 
+    HTTPClient *_httpClient = nullptr;
+    // Underlying connection object 
+    WiFiClient *_wifiClient = nullptr;
+#ifdef  ESP8266
+    // Trusted cert chain
+    BearSSL::X509List *_cert = nullptr;   
+#endif
+    // Store retry timeout suggested by server after last request
+    int _lastRetryAfter = 0;     
+     // HTTP options
+    HTTPOptions _httpOptions;
+protected:
+    // Sets request params
+    bool beforeRequest(const char *url);
+    // Handles response
+    bool afterRequest(int expectedStatusCode, httpResponseCallback cb, bool modifyLastConnStatus = true);
+public: 
+    // Creates HTTPService instance
+    // serverUrl - url of the InfluxDB 2 server (e.g. http://localhost:8086)
+    // authToken - InfluxDB 2 authorization token 
+    // certInfo - InfluxDB 2 server trusted certificate (or CA certificate) or certificate SHA1 fingerprint. Should be stored in PROGMEM.
+    HTTPService(ConnectionInfo *pConnInfo);
+    // Clean instance on deletion
+    ~HTTPService();
+    // Sets custom HTTP options. See HTTPOptions doc for more info. 
+    // Must be called before calling any method initiating a connection to server.
+    // Example: 
+    //    service.setHTTPOptions(HTTPOptions().httpReadTimeout(20000)).
+    void setHTTPOptions(const HTTPOptions &httpOptions);
+    // Returns current HTTPOption
+    HTTPOptions &getHTTPOptions() { return _httpOptions; }
+    // Performs HTTP POST by sending data. On success calls response call back  
+    bool doPOST(const char *url, const char *data, const char *contentType, int expectedCode, httpResponseCallback cb);
+    // Performs HTTP POST by sending stream. On success calls response call back  
+    bool doPOST(const char *url, Stream *stream, const char *contentType, int expectedCode, httpResponseCallback cb);
+    // Performs HTTP GET. On success calls response call back    
+    bool doGET(const char *url, int expectedCode, httpResponseCallback cb);
+    // Performs HTTP DELETE. On success calls response call back    
+    bool doDELETE(const char *url, int expectedCode, httpResponseCallback cb);
+    // Returns InfluxDBServer API URL
+    String getServerAPIURL() const { return _apiURL; }
+    // Returns value of the Retry-After HTTP header from recent call. 0 if it was missing.
+    int getLastRetryAfter() const { return _lastRetryAfter; }
+    // Returns HTTP status code of recent call.
+    int getLastStatusCode() const { return  _lastStatusCode;  }
+    // Returns time of recent call successful call.
+    uint32_t getLastRequestTime() const { return _lastRequestTime; }
+    // Returns response of last failed call.
+    String getLastErrorMessage() const { return _pConnInfo->lastError; }
+    // Returns true if HTTP connection is kept open
+    bool isConnected() const { return _httpClient && _httpClient->connected(); }
+};
+
+#endif //_HTTP_SERVICE_H_

firmware/libraries/ESP8266_Influxdb/src/InfluxData.cpp

@@ -0,0 +1,39 @@
+/**
+ * 
+ * InfluxData.cpp: InfluxDB Client for Arduino
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2018-2020 Tobias Schürg
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#include "InfluxData.h"
+#include "util/helpers.h"
+
+void InfluxData::setTimestamp(long int seconds) 
+{ 
+    _timestamp = timeStampToString(seconds,9);
+    strcat(_timestamp, "000000000"); 
+}
+
+ String InfluxData::toString() const { 
+    String t; 
+    return createLineProtocol(t); 
+}

firmware/libraries/ESP8266_Influxdb/src/InfluxData.h

@@ -0,0 +1,37 @@
+/**
+ * 
+ * InfluxData.h: InfluxDB Client for Arduino
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2018-2020 Tobias Schürg
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#include "InfluxDbClient.h"
+
+class InfluxData : public Point {
+ public:
+  InfluxData(String measurement) : Point(measurement) {}
+
+  void addValue(String key, float value) { addField(key, value); }
+  void addValueString(String key, String value) { addField(key, value); }
+  void setTimestamp(long int seconds);
+  String toString() const;
+};

firmware/libraries/ESP8266_Influxdb/src/InfluxDb.cpp

@@ -0,0 +1,157 @@
+/**
+ * 
+ * InfluxDb.cpp: InfluxDB Client for Arduino
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2018-2020 Tobias Schürg
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#include "InfluxDb.h"
+#include "Arduino.h"
+
+/**
+ * Construct an InfluxDb instance.
+ * @param host the InfluxDb host
+ * @param port the InfluxDb port
+ */
+Influxdb::Influxdb(String host, uint16_t port) {
+  if(port == 443) {
+    // this happens usualy when influxdb is behind fw/proxy. Mostly, when influxdb is switched to https, the port remains the same (8086)
+    // port number shouldn't be qualificator for secure connection, either scheme or a flag
+    _connInfo.serverUrl = "https://";
+  } else {
+    _connInfo.serverUrl = "http://";
+  }
+  _connInfo.serverUrl += host + ":" + String(port);
+  _connInfo.dbVersion = 1;
+}
+
+/**
+ * Set the database to be used.
+ * @param db the Influx Database to be written to.
+ */
+void Influxdb::setDb(String db) {
+  _connInfo.bucket = db;
+}
+
+/**
+ * Set the database to be used with authentication.
+ */
+void Influxdb::setDbAuth(String db, String user, String pass) {
+  _connInfo.bucket = db;
+  _connInfo.user = user;
+  _connInfo.password = pass;
+}
+
+/**
+ * Set the Bucket to be used v2.0 ONLY.
+ * @param bucket the InfluxDB Bucket which must already exist
+ */
+void Influxdb::setBucket(String bucket) {
+  _connInfo.bucket = bucket;
+}
+
+/**
+ * Set the influxDB port.
+ * @param port both v1.x and v3 use 8086
+ */
+void Influxdb::setPort(uint16_t port){
+  int b = _connInfo.serverUrl.indexOf(":",5);
+  if(b > 0) {
+    _connInfo.serverUrl = _connInfo.serverUrl.substring(0, b+1) + String(port);
+  }
+}
+/**
+ * Set the Organization to be used v2.0 ONLY
+ * @param org the Name of the organization unit to use which must already exist
+ */
+void Influxdb::setOrg(String org){
+  _connInfo.org = org;
+}
+
+/**
+ * Set the authorization token v2.0 ONLY
+ * @param token the Auth Token from InfluxDBv2 *required*
+ */
+void Influxdb::setToken(String token){
+  _connInfo.authToken = token;
+}
+
+/**
+ * Set the version of InfluxDB to write to
+ * @param version accepts 1 for version 1.x or 2 for version 2.x
+ */
+void Influxdb::setVersion(uint16_t version){
+  _connInfo.dbVersion = version;
+}
+
+#if defined(ESP8266)
+/**
+ * Set server certificate finger print 
+ * @param fingerPrint server certificate finger print 
+ */
+void Influxdb::setFingerPrint(const char *fingerPrint){
+  _connInfo.certInfo = fingerPrint;
+}
+#endif
+
+void Influxdb::begin() {
+ 
+}
+
+/**
+ * Prepare a measurement to be sent.
+ */
+void Influxdb::prepare(InfluxData data) { 
+  ++_preparedPoints;
+  if(_writeOptions._batchSize <= _preparedPoints) {
+    // for preparation, batchsize must be greater than number of prepared points, or it will send data right away
+    _writeOptions._batchSize = _preparedPoints+1;
+    reserveBuffer(2*_writeOptions._batchSize);
+  }
+  write(data);
+}
+
+/**
+ * Write all prepared measurements into the db.
+ */
+boolean Influxdb::write() {
+  _preparedPoints = 0;
+  return flushBuffer();
+}
+
+/**
+ * Write a single measurement into the db.
+ */
+boolean Influxdb::write(InfluxData data) { 
+    return write(pointToLineProtocol(data));
+}
+
+/**
+ * Send raw data to InfluxDb.
+ *
+ * @see
+ * https://github.com/esp8266/Arduino/blob/cc0bfa04d401810ed3f5d7d01be6e88b9011997f/libraries/ESP8266HTTPClient/src/ESP8266HTTPClient.h#L44-L55
+ * for a list of error codes.
+ */
+boolean Influxdb::write(String data) {
+  return writeRecord(data);
+}

firmware/libraries/ESP8266_Influxdb/src/InfluxDb.h

@@ -0,0 +1,59 @@
+/**
+ * 
+ * InfluxDb.h: InfluxDB Client for Arduino
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2018-2020 Tobias Schürg
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#ifndef _INFLUXDB_H_
+#define _INFLUXDB_H
+
+#include "InfluxData.h"
+
+class Influxdb : public InfluxDBClient {
+ public:
+  Influxdb(String host, uint16_t port = 8086);
+
+  void setDb(String db);
+  void setDbAuth(String db, String user, String pass);
+
+  void setVersion(uint16_t version);
+  void setBucket(String bucket);
+  void setOrg(String org);
+  void setToken(String token);
+  void setPort(uint16_t port);
+#if defined(ESP8266)
+  void setFingerPrint(const char *fingerPrint);
+#endif
+
+  void prepare(InfluxData data);
+  boolean write();
+
+  boolean write(InfluxData data);
+  boolean write(String data);
+
+ private:
+  uint16_t _preparedPoints;
+  
+  void begin();
+};
+#endif

firmware/libraries/ESP8266_Influxdb/src/InfluxDbClient.cpp

@@ -0,0 +1,778 @@
+/**
+ * 
+ * InfluxDBClient.cpp: InfluxDB Client for Arduino
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2020 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#include "InfluxDbClient.h"
+#include "Platform.h"
+#include "Version.h"
+
+#include "util/debug.h"
+
+static const char TooEarlyMessage[] PROGMEM = "Cannot send request yet because of applied retry strategy. Remaining ";
+
+static String escapeJSONString(const String &value);
+static String precisionToString(WritePrecision precision, uint8_t version = 2) {
+    switch(precision) {
+        case WritePrecision::US:
+            return version==1?"u":"us";
+        case WritePrecision::MS:
+            return "ms";
+        case WritePrecision::NS:
+            return "ns";
+        case WritePrecision::S:
+            return "s";
+        default:
+            return "";
+    }
+}
+
+
+InfluxDBClient::InfluxDBClient() { 
+   resetBuffer();
+}
+
+InfluxDBClient::InfluxDBClient(const String &serverUrl, const String &db):InfluxDBClient() {
+    setConnectionParamsV1(serverUrl, db);
+}
+
+InfluxDBClient::InfluxDBClient(const String &serverUrl, const String &org, const String &bucket, const String &authToken):InfluxDBClient(serverUrl, org, bucket, authToken, nullptr) { 
+}
+
+InfluxDBClient::InfluxDBClient(const String &serverUrl, const String &org, const String &bucket, const String &authToken, const char *serverCert):InfluxDBClient() {
+    setConnectionParams(serverUrl, org, bucket, authToken, serverCert);
+}
+
+void InfluxDBClient::setInsecure(bool value){
+  _connInfo.insecure = value;
+}
+
+void InfluxDBClient::setConnectionParams(const String &serverUrl, const String &org, const String &bucket, const String &authToken, const char *certInfo) {
+    clean();
+    _connInfo.serverUrl = serverUrl;
+    _connInfo.bucket = bucket;
+    _connInfo.org = org;
+    _connInfo.authToken = authToken;
+    _connInfo.certInfo = certInfo;
+    _connInfo.dbVersion = 2;
+}
+
+void InfluxDBClient::setConnectionParamsV1(const String &serverUrl, const String &db, const String &user, const String &password, const char *certInfo) {
+    clean();
+    _connInfo.serverUrl = serverUrl;
+    _connInfo.bucket = db;
+    _connInfo.user = user;
+    _connInfo.password = password;
+    _connInfo.certInfo = certInfo;
+    _connInfo.dbVersion = 1;
+}
+
+bool InfluxDBClient::init() {
+    INFLUXDB_CLIENT_DEBUG("[D] Init\n");
+    INFLUXDB_CLIENT_DEBUG("[D]  Library version: " INFLUXDB_CLIENT_VERSION "\n");
+    INFLUXDB_CLIENT_DEBUG("[D]  Device : " INFLUXDB_CLIENT_PLATFORM "\n");
+    INFLUXDB_CLIENT_DEBUG("[D]  SDK version: " INFLUXDB_CLIENT_PLATFORM_VERSION "\n");
+    INFLUXDB_CLIENT_DEBUG("[D]  Server url: %s\n", _connInfo.serverUrl.c_str());
+    INFLUXDB_CLIENT_DEBUG("[D]  Org: %s\n", _connInfo.org.c_str());
+    INFLUXDB_CLIENT_DEBUG("[D]  Bucket: %s\n", _connInfo.bucket.c_str());
+    INFLUXDB_CLIENT_DEBUG("[D]  Token: %s\n", _connInfo.authToken.c_str());
+    INFLUXDB_CLIENT_DEBUG("[D]  DB version: %d\n", _connInfo.dbVersion);
+    if(_connInfo.serverUrl.length() == 0 || (_connInfo.dbVersion == 2 && (_connInfo.org.length() == 0 || _connInfo.bucket.length() == 0 || _connInfo.authToken.length() == 0))) {
+        INFLUXDB_CLIENT_DEBUG("[E] Invalid parameters\n");
+        _connInfo.lastError = F("Invalid parameters");
+        return false;
+    }
+    if(_connInfo.serverUrl.endsWith("/")) {
+         _connInfo.serverUrl = _connInfo.serverUrl.substring(0,_connInfo.serverUrl.length()-1);
+    }
+    if(!_connInfo.serverUrl.startsWith("http")) {
+        _connInfo.lastError = F("Invalid URL scheme");
+        return false;
+    }
+    _service = new HTTPService(&_connInfo);
+
+    setUrls();
+    
+    return true;
+}
+
+
+
+InfluxDBClient::~InfluxDBClient() {
+     if(_writeBuffer) {
+        for(int i=0;i<_writeBufferSize;i++) {
+            delete _writeBuffer[i];
+        }
+        delete [] _writeBuffer;
+        _writeBuffer = nullptr;
+        _bufferPointer = 0;
+        _batchPointer = 0;
+        _bufferCeiling = 0;
+    }
+    clean();
+}
+
+void InfluxDBClient::clean() {
+    if(_service) {
+        delete _service;
+        _service = nullptr;
+    }
+    _buckets = nullptr;
+    _lastFlushed = millis();
+    _retryTime = 0;
+}
+
+bool InfluxDBClient::setUrls() {
+    if(!_service && !init()) {
+        return false;
+    }
+    INFLUXDB_CLIENT_DEBUG("[D] setUrls\n");
+    if( _connInfo.dbVersion == 2) {
+        _writeUrl = _service->getServerAPIURL();
+        _writeUrl += "write?org=";
+        _writeUrl +=  urlEncode(_connInfo.org.c_str());
+        _writeUrl += "&bucket=";
+        _writeUrl += urlEncode(_connInfo.bucket.c_str());
+        INFLUXDB_CLIENT_DEBUG("[D]  writeUrl: %s\n", _writeUrl.c_str());
+        _queryUrl = _service->getServerAPIURL();;
+        _queryUrl += "query?org=";
+        _queryUrl +=  urlEncode(_connInfo.org.c_str());
+        INFLUXDB_CLIENT_DEBUG("[D]  queryUrl: %s\n", _queryUrl.c_str());
+    } else {
+        _writeUrl = _connInfo.serverUrl;
+        _writeUrl += "/write?db=";
+        _writeUrl += urlEncode(_connInfo.bucket.c_str());
+        _queryUrl = _connInfo.serverUrl;
+        _queryUrl += "/api/v2/query";
+        if(_connInfo.user.length() > 0 && _connInfo.password.length() > 0) {
+            String auth = "&u=";
+            auth += urlEncode(_connInfo.user.c_str());
+            auth += "&p=";
+            auth += urlEncode(_connInfo.password.c_str());
+            _writeUrl += auth;  
+            _queryUrl += "?";
+            _queryUrl += auth;
+        }
+        INFLUXDB_CLIENT_DEBUG("[D]  writeUrl: %s\n", _writeUrl.c_str());
+        INFLUXDB_CLIENT_DEBUG("[D]  queryUrl: %s\n", _queryUrl.c_str());
+    }
+    if(_writeOptions._writePrecision != WritePrecision::NoTime) {
+        _writeUrl += "&precision=";
+        _writeUrl += precisionToString(_writeOptions._writePrecision, _connInfo.dbVersion);
+        INFLUXDB_CLIENT_DEBUG("[D]  writeUrl: %s\n", _writeUrl.c_str());
+    }
+    return true;
+}
+
+bool InfluxDBClient::setWriteOptions(WritePrecision precision, uint16_t batchSize, uint16_t bufferSize, uint16_t flushInterval, bool preserveConnection) {
+    if(!_service && !init()) {
+        return false;
+    }
+    if(!setWriteOptions(WriteOptions().writePrecision(precision).batchSize(batchSize).bufferSize(bufferSize).flushInterval(flushInterval))) {
+        return false;
+    }
+    if(!setHTTPOptions(_service->getHTTPOptions().connectionReuse(preserveConnection))) {
+        return false;
+    }
+    return true;
+}
+
+bool InfluxDBClient::setWriteOptions(const WriteOptions & writeOptions) {
+    if(_writeOptions._writePrecision != writeOptions._writePrecision) {
+        _writeOptions._writePrecision = writeOptions._writePrecision;
+        if(!setUrls()) {
+            return false;
+        }
+    }
+    bool writeBufferSizeChanges = false;
+    if(writeOptions._batchSize > 0 && _writeOptions._batchSize != writeOptions._batchSize) {
+        _writeOptions._batchSize = writeOptions._batchSize;
+        writeBufferSizeChanges = true;
+    }
+    if(writeOptions._bufferSize > 0 && _writeOptions._bufferSize != writeOptions._bufferSize) {
+        _writeOptions._bufferSize = writeOptions._bufferSize;
+        if(_writeOptions._bufferSize <  2*_writeOptions._batchSize) {
+            _writeOptions._bufferSize = 2*_writeOptions._batchSize;
+            INFLUXDB_CLIENT_DEBUG("[D] Changing buffer size to %d\n", _writeOptions._bufferSize);
+        }
+        writeBufferSizeChanges = true;
+    }
+    if(writeBufferSizeChanges) {
+        resetBuffer();
+    }
+    _writeOptions._flushInterval = writeOptions._flushInterval;
+    _writeOptions._retryInterval = writeOptions._retryInterval;
+    _writeOptions._maxRetryInterval = writeOptions._maxRetryInterval;
+    _writeOptions._maxRetryAttempts = writeOptions._maxRetryAttempts;
+    _writeOptions._defaultTags = writeOptions._defaultTags;
+    return true;
+}
+
+bool InfluxDBClient::setHTTPOptions(const HTTPOptions & httpOptions) {
+    if(!_service && !init()) {
+        return false;
+    }
+    _service->setHTTPOptions(httpOptions);
+    return true;
+}
+
+BucketsClient InfluxDBClient::getBucketsClient() {
+    if(!_service && !init()) {
+        return BucketsClient();
+    }
+    if(!_buckets) {
+        _buckets = BucketsClient(&_connInfo, _service);
+    }
+    return _buckets;
+}
+
+void InfluxDBClient::resetBuffer() {
+    if(_writeBuffer) {
+        for(int i=0;i<_writeBufferSize;i++) {
+            delete _writeBuffer[i];
+        }
+        delete [] _writeBuffer;
+    }
+    INFLUXDB_CLIENT_DEBUG("[D] Reset buffer: buffer Size: %d, batch size: %d\n", _writeOptions._bufferSize, _writeOptions._batchSize);
+    uint16_t a = _writeOptions._bufferSize/_writeOptions._batchSize;
+    //limit to max(byte)
+    _writeBufferSize = a>=(1<<8)?(1<<8)-1:a;
+    if(_writeBufferSize < 2) {
+        _writeBufferSize = 2;
+    }
+    INFLUXDB_CLIENT_DEBUG("[D] Reset buffer: writeBuffSize: %d\n", _writeBufferSize);
+    _writeBuffer = new Batch*[_writeBufferSize];
+    for(int i=0;i<_writeBufferSize;i++) {
+        _writeBuffer[i] = nullptr;
+    }
+    _bufferPointer = 0;
+    _batchPointer = 0;
+    _bufferCeiling = 0;
+}
+
+void InfluxDBClient::reserveBuffer(int size) {
+    if(size > _writeBufferSize) {
+        Batch **newBuffer = new Batch*[size];
+        INFLUXDB_CLIENT_DEBUG("[D] Resizing buffer from %d to %d\n",_writeBufferSize, size);
+        for(int i=0;i<_bufferCeiling; i++) {
+            newBuffer[i] = _writeBuffer[i];
+        }
+        
+        delete [] _writeBuffer;
+        _writeBuffer = newBuffer;
+        _writeBufferSize = size;
+    }
+}
+
+void InfluxDBClient::addZerosToTimestamp(Point &point, int zeroes) {
+    char *ts = point._timestamp, *s;
+    point._timestamp = new char[strlen(point._timestamp) + 1 + zeroes];
+    strcpy(point._timestamp, ts);
+    s = point._timestamp+strlen(ts);
+    for(int i=0;i<zeroes;i++) {
+        *s++ = '0';
+    }
+    *s = 0;
+    delete [] ts;
+}
+
+void InfluxDBClient::checkPrecisions(Point & point) {
+    if(_writeOptions._writePrecision != WritePrecision::NoTime) {
+        if(!point.hasTime()) {
+            point.setTime(_writeOptions._writePrecision);
+        // Check different write precisions
+        } else if(point._tsWritePrecision != WritePrecision::NoTime && point._tsWritePrecision != _writeOptions._writePrecision) {
+            int diff = int(point._tsWritePrecision) - int(_writeOptions._writePrecision);
+            if(diff > 0) { //point has higher precision, cut 
+                point._timestamp[strlen(point._timestamp)-diff*3] = 0;
+            } else { //point has lower precision, add zeroes
+                addZerosToTimestamp(point, diff*-3);
+            }
+        }
+    // check someone set WritePrecision on point and not on client. NS precision is ok, cause it is default on server
+    } else if(point.hasTime() && point._tsWritePrecision != WritePrecision::NoTime && point._tsWritePrecision != WritePrecision::NS) {
+        int diff = int(WritePrecision::NS) - int(point._tsWritePrecision);
+        addZerosToTimestamp(point, diff*3);
+    } 
+}
+
+bool InfluxDBClient::writePoint(Point & point) {
+    if (point.hasFields()) {
+        checkPrecisions(point);
+        String line = pointToLineProtocol(point);
+        return writeRecord(line);
+    }
+    return false;
+}
+
+
+
+InfluxDBClient::Batch::Batch(uint16_t size):_size(size) {  
+    buffer = new char*[size]; 
+    for(int i=0;i< _size; i++) {
+        buffer[i] = nullptr; 
+    }
+}
+
+
+InfluxDBClient::Batch::~Batch() { 
+    clear();
+    delete [] buffer; 
+    buffer = nullptr;
+}
+
+void InfluxDBClient::Batch::clear() {
+    for(int i=0;i< _size; i++) {
+        free(buffer[i]);
+        buffer[i] = nullptr; 
+    }
+}
+
+bool InfluxDBClient::Batch::append(const char *line) {
+    if(pointer == _size) {
+        //overwriting, clean buffer
+        clear();
+        pointer = 0;
+    } 
+    buffer[pointer] = strdup(line);
+    ++pointer;
+    return isFull();
+}
+
+char * InfluxDBClient::Batch::createData() {
+     int length = 0; 
+     char *buff = nullptr;
+     for(int c=0; c < pointer; c++) {
+        length += strlen(buffer[c]);
+        yield();
+    }
+    //create buffer for all lines including new line char and terminating char
+    if(length) {
+        buff = new char[length + pointer + 1];
+        if(buff) {
+            buff[0] = 0;
+            for(int c=0; c < pointer; c++) {
+                strcat(buff+strlen(buff), buffer[c]);
+                strcat(buff+strlen(buff), "\n");
+                yield();
+            }
+        }
+    }
+    return buff;
+}
+
+bool InfluxDBClient::writeRecord(const String &record) {
+    return writeRecord(record.c_str());
+}
+
+bool InfluxDBClient::writeRecord(const char *record) {    
+    if(!_writeBuffer[_bufferPointer]) {
+        _writeBuffer[_bufferPointer] = new Batch(_writeOptions._batchSize);
+    }
+    if(isBufferFull() && _batchPointer <= _bufferPointer) {
+        // When we are overwriting buffer and nothing is written, batchPointer must point to the oldest point
+        _batchPointer = _bufferPointer+1;
+        if(_batchPointer == _writeBufferSize) {
+            _batchPointer = 0;
+        }
+    }
+    if(_writeBuffer[_bufferPointer]->append(record)) { //we reached batch size
+        _bufferPointer++;
+        if(_bufferPointer == _writeBufferSize) { // writeBuffer is full
+            _bufferPointer = 0;
+            INFLUXDB_CLIENT_DEBUG("[W] Reached write buffer size, old points will be overwritten\n");
+        } 
+
+        if(_bufferCeiling < _writeBufferSize) {
+            _bufferCeiling++;
+        }
+    } 
+    INFLUXDB_CLIENT_DEBUG("[D] writeRecord: bufferPointer: %d, batchPointer: %d, _bufferCeiling: %d\n", _bufferPointer, _batchPointer, _bufferCeiling);    
+    return checkBuffer();
+}
+
+bool InfluxDBClient::checkBuffer() {
+    // in case we (over)reach batchSize with non full buffer
+    bool bufferReachedBatchsize = _writeBuffer[_batchPointer] && _writeBuffer[_batchPointer]->isFull();
+    // or flush interval timed out
+    bool flushTimeout = _writeOptions._flushInterval > 0 && ((millis() - _lastFlushed)/1000) >= _writeOptions._flushInterval; 
+
+    INFLUXDB_CLIENT_DEBUG("[D] Flushing buffer: is oversized %s, is timeout %s, is buffer full %s\n", 
+        bool2string(bufferReachedBatchsize),bool2string(flushTimeout), bool2string(isBufferFull()));
+    
+    if(bufferReachedBatchsize || flushTimeout || isBufferFull() ) {
+        
+       return flushBufferInternal(!flushTimeout);
+    } 
+    return true;
+}
+
+bool InfluxDBClient::flushBuffer() {
+    return flushBufferInternal(false);
+}
+
+uint32_t InfluxDBClient::getRemainingRetryTime() {
+    uint32_t rem = 0;
+    if(_retryTime > 0) {
+        int32_t diff = _retryTime - (millis()-_service->getLastRequestTime())/1000;
+        rem  =  diff<0?0:(uint32_t)diff;
+    }
+    return rem;
+}
+
+bool InfluxDBClient::flushBufferInternal(bool flashOnlyFull) {
+    uint32_t rwt = getRemainingRetryTime();
+    if(rwt > 0) {
+        INFLUXDB_CLIENT_DEBUG("[W] Cannot write yet, pause %ds, %ds yet\n", _retryTime, rwt);
+        // retry after period didn't run out yet
+        _connInfo.lastError = FPSTR(TooEarlyMessage);
+        _connInfo.lastError += String(rwt);
+        _connInfo.lastError += "s";
+        return false;
+    }
+    char *data;
+    bool success = true;
+    // send all batches, It could happen there was long network outage and buffer is full
+    while(_writeBuffer[_batchPointer] && (!flashOnlyFull ||  _writeBuffer[_batchPointer]->isFull())) {
+        if(!_writeBuffer[_batchPointer]->isFull() && _writeBuffer[_batchPointer]->retryCount == 0 ) { //do not increase pointer in case of retrying
+            // points will be written so increase _bufferPointer as it happen when buffer is flushed when is full
+            if(++_bufferPointer == _writeBufferSize) {
+                _bufferPointer = 0;
+            }
+        }
+
+        INFLUXDB_CLIENT_DEBUG("[D] Writing batch, batchpointer: %d, size %d\n", _batchPointer, _writeBuffer[_batchPointer]->pointer);
+        if(!_writeBuffer[_batchPointer]->isEmpty()) {
+            int statusCode = 0;
+            if(_streamWrite) {
+                statusCode = postData(_writeBuffer[_batchPointer]);
+            } else {
+                data = _writeBuffer[_batchPointer]->createData();
+                statusCode = postData(data);
+                delete [] data;
+            }
+            // retry on unsuccessfull connection or retryable status codes
+            bool retry = (statusCode < 0 || statusCode >= 429) && _writeOptions._maxRetryAttempts > 0;
+            success = statusCode >= 200 && statusCode < 300;
+            // advance even on message failure x e <300;429)
+            if(success || !retry) {
+                _lastFlushed = millis();
+                dropCurrentBatch();
+            } else if(retry) {
+                _writeBuffer[_batchPointer]->retryCount++;
+                if(statusCode > 0) { //apply retry strategy only in case of HTTP errors
+                    if(_writeBuffer[_batchPointer]->retryCount > _writeOptions._maxRetryAttempts) {
+                        INFLUXDB_CLIENT_DEBUG("[D] Reached max retry count, dropping batch\n");
+                        dropCurrentBatch();
+                    }
+                    if(!_retryTime) {
+                        _retryTime = _writeOptions._retryInterval;
+                        if(_writeBuffer[_batchPointer]) {
+                            for(int i=1;i<_writeBuffer[_batchPointer]->retryCount;i++) {
+                                _retryTime *= _writeOptions._retryInterval;
+                            }
+                            if(_retryTime > _writeOptions._maxRetryInterval) {
+                                _retryTime = _writeOptions._maxRetryInterval;
+                            }
+                        }
+                    }
+                } 
+                INFLUXDB_CLIENT_DEBUG("[D] Leaving data in buffer for retry, retryInterval: %d\n",_retryTime);
+                // in case of retryable failure break loop
+                break;
+            }
+        }
+       yield();
+    }
+    //Have we emptied the buffer?
+    INFLUXDB_CLIENT_DEBUG("[D] Success: %d, _bufferPointer: %d, _batchPointer: %d, _writeBuffer[_bufferPointer]_%p\n",success,_bufferPointer,_batchPointer, _writeBuffer[_bufferPointer]);
+    if(_batchPointer == _bufferPointer && !_writeBuffer[_bufferPointer]) {
+        _bufferPointer = 0;
+        _batchPointer = 0;
+        _bufferCeiling = 0;
+        INFLUXDB_CLIENT_DEBUG("[D] Buffer empty\n");
+    }
+    return success;
+}
+
+void  InfluxDBClient::dropCurrentBatch() {
+    delete _writeBuffer[_batchPointer];
+    _writeBuffer[_batchPointer] = nullptr;
+    _batchPointer++;
+    //did we got over top?
+    if(_batchPointer == _writeBufferSize) {
+        // restart _batchPointer in ring buffer from start
+        _batchPointer = 0;
+        // we reached buffer size, that means buffer was full and now lower ceiling 
+        _bufferCeiling = _bufferPointer;
+    }
+    INFLUXDB_CLIENT_DEBUG("[D] Dropped batch, batchpointer: %d\n", _batchPointer);
+}
+
+String InfluxDBClient::pointToLineProtocol(const Point& point) {
+    return point.createLineProtocol(_writeOptions._defaultTags);
+}
+
+bool InfluxDBClient::validateConnection() {
+    if(!_service && !init()) {
+        return false;
+    }
+    // on version 1.x /ping will by default return status code 204, without verbose
+    String url = _connInfo.serverUrl + (_connInfo.dbVersion==2?"/health":"/ping?verbose=true");
+    if(_connInfo.dbVersion==1 && _connInfo.user.length() > 0 && _connInfo.password.length() > 0) {
+        url += "&u=";
+        url += urlEncode(_connInfo.user.c_str());
+        url += "&p=";
+        url += urlEncode(_connInfo.password.c_str());
+    }
+    INFLUXDB_CLIENT_DEBUG("[D] Validating connection to %s\n", url.c_str());
+
+    bool ret = _service->doGET(url.c_str(), 200, nullptr);
+    if(!ret) {
+        INFLUXDB_CLIENT_DEBUG("[D] error %d: %s\n", _service->getLastStatusCode(), _service->getLastErrorMessage().c_str());
+    }
+    return ret;
+}
+
+int InfluxDBClient::postData(const char *data) {
+    if(!_service && !init()) {
+        return 0;
+    }
+    if(data) {
+        INFLUXDB_CLIENT_DEBUG("[D] Writing to %s\n", _writeUrl.c_str());
+        INFLUXDB_CLIENT_DEBUG("[D] Sending:\n%s\n", data);       
+        if(!_service->doPOST(_writeUrl.c_str(), data, PSTR("text/plain"), 204, nullptr)) {
+            INFLUXDB_CLIENT_DEBUG("[D] error %d: %s\n", _service->getLastStatusCode(), _service->getLastErrorMessage().c_str());
+        }
+        _retryTime = _service->getLastRetryAfter();
+        return _service->getLastStatusCode();
+    } 
+    return 0;
+}
+
+int InfluxDBClient::postData(Batch *batch) {
+    if(!_service && !init()) {
+        return 0;
+    }
+
+    BatchStreamer *bs = new BatchStreamer(batch);
+    INFLUXDB_CLIENT_DEBUG("[D] Writing to %s\n", _writeUrl.c_str());
+    INFLUXDB_CLIENT_DEBUG("[D] Sending:\n");       
+    
+    if(!_service->doPOST(_writeUrl.c_str(), bs, PSTR("text/plain"), 204, nullptr)) {
+        INFLUXDB_CLIENT_DEBUG("[D] error %d: %s\n", _service->getLastStatusCode(), _service->getLastErrorMessage().c_str());
+    }
+    delete bs;
+    _retryTime = _service->getLastRetryAfter();
+    return _service->getLastStatusCode();
+}
+
+void InfluxDBClient::setStreamWrite(bool enable) {
+    _streamWrite = enable;
+}
+
+
+static const char QueryDialect[] PROGMEM = "\
+\"dialect\": {\
+\"annotations\": [\
+\"datatype\"\
+],\
+\"dateTimeFormat\": \"RFC3339\",\
+\"header\": true,\
+\"delimiter\": \",\",\
+\"commentPrefix\": \"#\"\
+}";
+
+static const char Params[] PROGMEM = ",\
+\"params\": {";
+
+FluxQueryResult InfluxDBClient::query(const String &fluxQuery) {
+    return query(fluxQuery, QueryParams());
+}
+
+FluxQueryResult InfluxDBClient::query(const String &fluxQuery, QueryParams params) {
+    uint32_t rwt = getRemainingRetryTime();
+    if(rwt > 0) {
+        INFLUXDB_CLIENT_DEBUG("[W] Cannot query yet, pause %ds, %ds yet\n", _retryTime, rwt);
+        // retry after period didn't run out yet
+        String mess = FPSTR(TooEarlyMessage);
+        mess += String(rwt);
+        mess += "s";
+        return FluxQueryResult(mess);
+    }
+    if(!_service && !init()) {
+        return FluxQueryResult(_connInfo.lastError);
+    }
+    INFLUXDB_CLIENT_DEBUG("[D] Query to %s\n", _queryUrl.c_str());
+    INFLUXDB_CLIENT_DEBUG("[D] JSON query:\n%s\n", fluxQuery.c_str());
+
+    String queryEsc = escapeJSONString(fluxQuery);
+    String body;
+    body.reserve(150 + queryEsc.length() + params.size()*30);
+    body = F("{\"type\":\"flux\",\"query\":\"");
+    body +=  queryEsc;
+    body += "\",";
+    body += FPSTR(QueryDialect);
+    if(params.size()) {
+        body += FPSTR(Params);
+        body += params.jsonString(0);
+        for(int i=1;i<params.size();i++) {
+            body +=",";
+            char *js = params.jsonString(i);
+            body += js;
+            delete [] js;
+        }
+        body += '}';
+    }
+    body += '}';
+    CsvReader *reader = nullptr;
+    _retryTime = 0;
+    INFLUXDB_CLIENT_DEBUG("[D] Query: %s\n", body.c_str());
+    if(_service->doPOST(_queryUrl.c_str(), body.c_str(), PSTR("application/json"), 200, [&](HTTPClient *httpClient){
+        bool chunked = false;
+        if(httpClient->hasHeader(TransferEncoding)) {
+            String header = httpClient->header(TransferEncoding);
+            chunked = header.equalsIgnoreCase("chunked");
+        }
+        INFLUXDB_CLIENT_DEBUG("[D] chunked: %s\n", bool2string(chunked));
+        HttpStreamScanner *scanner = new HttpStreamScanner(httpClient, chunked);
+        reader = new CsvReader(scanner);
+        return false;
+    })) {
+        return FluxQueryResult(reader);
+    } else {
+        _retryTime = _service->getLastRetryAfter();
+        return FluxQueryResult(_service->getLastErrorMessage());
+    }
+}
+
+
+static String escapeJSONString(const String &value) {
+    String ret;
+    int d = 0;
+    int i,from = 0;
+    while((i = value.indexOf('"',from)) > -1) {
+        d++;
+        if(i == (int)value.length()-1) {
+            break;
+        }
+        from = i+1;
+    }
+    ret.reserve(value.length()+d); //most probably we will escape just double quotes
+    for (char c: value)
+    {
+        switch (c)
+        {
+            case '"': ret += "\\\""; break;
+            case '\\': ret += "\\\\"; break;
+            case '\b': ret += "\\b"; break;
+            case '\f': ret += "\\f"; break;
+            case '\n': ret += "\\n"; break;
+            case '\r': ret += "\\r"; break;
+            case '\t': ret += "\\t"; break;
+            default:
+                if (c <= '\x1f') {
+                    ret += "\\u";
+                    char buf[3 + 8 * sizeof(unsigned int)];
+                    sprintf(buf,  "\\u%04u", c);
+                    ret += buf;
+                } else {
+                    ret += c;
+                }
+        }
+    }
+    return ret;
+}
+
+InfluxDBClient::BatchStreamer::BatchStreamer(InfluxDBClient::Batch *batch) {
+    _batch = batch;
+    _read = 0;
+    _length = 0;
+    _pointer = 0;
+    _linePointer = 0;
+    for(uint16_t i=0;i<_batch->pointer;i++) {
+        _length += strlen(_batch->buffer[i])+1;
+    }
+}
+
+int InfluxDBClient::BatchStreamer::available() {
+    return _length-_read;
+}
+
+int InfluxDBClient::BatchStreamer::availableForWrite() {
+    return 0;
+}
+
+#if defined(ESP8266)        
+int InfluxDBClient::BatchStreamer::read(uint8_t* buffer, size_t len) {
+    INFLUXDB_CLIENT_DEBUG("BatchStream::read %d\n", len);
+    return readBytes((char *)buffer, len);
+}
+#endif
+size_t InfluxDBClient::BatchStreamer::readBytes(char* buffer, size_t len) {
+
+    INFLUXDB_CLIENT_DEBUG("BatchStream::readBytes %d\n", len);
+    unsigned int r=0;
+    for(unsigned int i=0;i<len;i++) {
+        if(available()) {
+            buffer[i] = read();
+            r++;
+        } else {
+            break;
+        }
+    }
+    return r;
+}
+
+int InfluxDBClient::BatchStreamer::read()  {
+    int r = peek();
+    if(r > 0) {
+        ++_read;
+        ++_linePointer;
+        if(!_batch->buffer[_pointer][_linePointer-1]) {
+            ++_pointer;
+            _linePointer = 0;
+        }
+    }
+    return r;
+}
+
+int InfluxDBClient::BatchStreamer::peek() {
+    if(_pointer == _batch->pointer) {
+        //This should not happen
+        return -1;
+    }
+    
+    int r;
+    if(!_batch->buffer[_pointer][_linePointer]) {
+        r = '\n';
+    } else {
+        r = _batch->buffer[_pointer][_linePointer];
+    }
+    return r;
+}
+
+size_t InfluxDBClient::BatchStreamer::write(uint8_t)  {
+    return 0;
+}

firmware/libraries/ESP8266_Influxdb/src/InfluxDbClient.h

@@ -0,0 +1,273 @@
+/**
+ * 
+ * InfluxDBClient.h: InfluxDB Client for Arduino
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2020 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#ifndef _INFLUXDB_CLIENT_H_
+#define _INFLUXDB_CLIENT_H_
+
+#include <Arduino.h>
+#include "HTTPService.h"
+#include "Point.h"  
+#include "WritePrecision.h"
+#include "query/FluxParser.h"
+#include "query/Params.h"
+#include "util/helpers.h"
+#include "Options.h"
+#include "BucketsClient.h"
+#include "Version.h"
+
+#ifdef USING_AXTLS
+#error AxTLS does not work
+#endif
+
+class Test;
+
+/**
+ * InfluxDBClient handles connection and basic operations for an InfluxDB server.
+ * It provides write API with ability to write data in batches and retrying failed writes.
+ * Automaticaly retries failed writes during next write, if server is overloaded.
+ */
+class InfluxDBClient {
+  friend class Test;
+  public:
+    // Creates InfluxDBClient unconfigured instance. 
+    // Call to setConnectionParams is required to set up client 
+    InfluxDBClient();
+    // Creates InfluxDBClient instance for unsecured connection to InfluxDB 1
+    // serverUrl - url of the InfluxDB 1 server (e.g. http://localhost:8086)
+    // db - database name where to store or read data
+    InfluxDBClient(const String &serverUrl, const String &db);
+    // Creates InfluxDBClient instance for unsecured connection
+    // serverUrl - url of the InfluxDB 2 server (e.g. http://localhost:8086)
+    // org - name of the organization, which bucket belongs to    
+    // bucket - name of the bucket to write data into
+    // authToken - InfluxDB 2 authorization token
+    InfluxDBClient(const String &serverUrl, const String &org, const String &bucket, const String &authToken);
+    // Creates InfluxDBClient instance for secured connection
+    // serverUrl - url of the InfluxDB 2 server (e.g. https://localhost:8086)
+    // org - name of the organization, which bucket belongs to 
+    // bucket - name of the bucket to write data into
+    // authToken - InfluxDB 2 authorization token
+    // certInfo - InfluxDB 2 server trusted certificate (or CA certificate) or certificate SHA1 fingerprint. Should be stored in PROGMEM.
+    InfluxDBClient(const String &serverUrl, const String &org, const String &bucket, const String &authToken, const char *certInfo);
+    // Clears instance.
+    ~InfluxDBClient();
+    // Allows insecure connection by skiping server certificate validation. 
+    // setInsecure must be called before calling any method initiating a connection to server.
+    void setInsecure(bool value = true);
+    // Sets custom write options.
+    // Must be called before calling any method initiating a connection to server.
+    // precision - timestamp precision of written data
+    // batchSize - number of points that will be written to the databases at once. Default 1 - writes immediately
+    // bufferSize - maximum size of Points buffer. Buffer contains new data that will be written to the database
+    //             and also data that failed to be written due to network failure or server overloading
+    // flushInterval - maximum number of seconds data will be held in buffer before are written to the db. 
+    //                 Data are written either when number of points in buffer reaches batchSize or time of  
+    // preserveConnection - true if HTTP connection should be kept open. Usable for frequent writes.
+    // Returns true if setting was successful. Otherwise check getLastErrorMessage() for an error.
+    bool setWriteOptions(WritePrecision precision, uint16_t batchSize = 1, uint16_t bufferSize = 5, uint16_t flushInterval = 60, bool preserveConnection = true) __attribute__ ((deprecated("Use setWriteOptions(const WriteOptions &writeOptions)")));
+    // Sets custom write options. See WriteOptions doc for more info. 
+    // Must be called before calling any method initiating a connection to server.
+    // Returns true if setting was successful. Otherwise check getLastErrorMessage() for an error.
+    // Example: 
+    //    client.setWriteOptions(WriteOptions().batchSize(10).bufferSize(50)).
+    bool setWriteOptions(const WriteOptions &writeOptions);
+    // Sets custom HTTP options. See HTTPOptions doc for more info. 
+    // Must be called before calling any method initiating a connection to server.
+    // Returns true if setting was successful. Otherwise check getLastErrorMessage() for an error.
+    // Example: 
+    //    client.setHTTPOptions(HTTPOptions().httpReadTimeout(20000)).
+      bool setHTTPOptions(const HTTPOptions &httpOptions);
+    // Sets connection parameters for InfluxDB 2
+    // Must be called before calling any method initiating a connection to server.
+    // serverUrl - url of the InfluxDB 2 server (e.g. https//localhost:8086)
+    // org - name of the organization, which bucket belongs to 
+    // bucket - name of the bucket to write data into
+    // authToken - InfluxDB 2 authorization token
+    // serverCert - Optional. InfluxDB 2 server trusted certificate (or CA certificate) or certificate SHA1 fingerprint.  Should be stored in PROGMEM. Only in case of https connection.
+    void setConnectionParams(const String &serverUrl, const String &org, const String &bucket, const String &authToken, const char *certInfo = nullptr);
+    // Sets parameters for connection to InfluxDB 1
+    // Must be called before calling any method initiating a connection to server.
+    // serverUrl - url of the InfluxDB server (e.g. http://localhost:8086)
+    // db - database name where to store or read data
+    // user - Optional. User name, in case of server requires authetication
+    // password - Optional. User password, in case of server requires authetication
+    // certInfo - Optional. InfluxDB server trusted certificate (or CA certificate) or certificate SHA1 fingerprint.  Should be stored in PROGMEM. Only in case of https connection.
+    void setConnectionParamsV1(const String &serverUrl, const String &db, const String &user = (const char *)nullptr, const String &password = (const char *)nullptr, const char *certInfo = nullptr);
+    // Creates line protocol string from point data and optional default tags set in WriteOptions.
+    String pointToLineProtocol(const Point& point);
+    // Validates connection parameters by conecting to server
+    // Returns true if successful, false in case of any error
+    bool validateConnection();
+    // Writes record in InfluxDB line protocol format to write buffer.
+    // Returns true if successful, false in case of any error 
+    bool writeRecord(const String &record);
+    bool writeRecord(const char *record);
+    // Writes record represented by Point to buffer
+    // Returns true if successful, false in case of any error 
+    bool writePoint(Point& point);
+    // Sends Flux query and returns FluxQueryResult object for subsequently reading flux query response.
+    // Use FluxQueryResult::next() method to iterate over lines of the query result.
+    // Always call of FluxQueryResult::close() when reading is finished. Check FluxQueryResult doc for more info.
+    FluxQueryResult query(const String &fluxQuery);
+    // Sends Flux query with params and returns FluxQueryResult object for subsequently reading flux query response.
+    // Use FluxQueryResult::next() method to iterate over lines of the query result.
+    // Always call of FluxQueryResult::close() when reading is finished. Check FluxQueryResult doc for more info.
+    FluxQueryResult query(const String &fluxQuery, QueryParams params);
+    // Forces writing of all points in buffer, even the batch is not full.
+    // Returns true if successful, false in case of any error 
+    bool flushBuffer();
+    // Returns true if points buffer is full. Usefull when server is overloaded and we may want increase period of write points or decrease number of points
+    bool isBufferFull() const  { return _bufferCeiling == _writeBufferSize; };
+    // Returns true if buffer is empty. Usefull when going to sleep and check if there is sth in write buffer (it can happens when batch size if bigger than 1). Call flushBuffer() then.
+    bool isBufferEmpty() const { return _bufferCeiling == 0 && !_writeBuffer[0]; };
+    // Checks points buffer status and flushes if number of points reached batch size or flush interval runs out.
+    // Returns true if successful, false in case of any error
+    bool checkBuffer();
+    // Wipes out buffered points
+    void resetBuffer();
+    // Returns HTTP status of last request to server. Usefull for advanced handling of failures.
+    int getLastStatusCode() const { return  _service?_service->getLastStatusCode():0;  }
+    // Returns last response when operation failed
+    String getLastErrorMessage() const { return _connInfo.lastError; }
+    // Returns server url
+    String getServerUrl() const { return _connInfo.serverUrl; }
+    // Check if it is possible to send write/query request to server. 
+    // Returns true if write or query can be send, or false, if server is overloaded and retry strategy is applied.
+    // Use getRemainingRetryTime() to get wait time in such case.
+    bool canSendRequest() { return getRemainingRetryTime() == 0; }
+    // Returns remaining wait time in seconds when retry strategy is applied.
+    uint32_t getRemainingRetryTime();
+    // Returns sub-client for managing buckets
+    BucketsClient getBucketsClient();
+    // Enables/disables streaming write. This allows sending large batches without allocating buffer.
+    // It is about 50% slower than writing by allocated buffer (default);
+    void setStreamWrite(bool enable = true);
+    // Returns true if HTTP connection is kept open (connection reuse must be set to true)
+    bool isConnected() const { return _service && _service->isConnected(); }
+  protected:
+    // Checks params and sets up security, if needed.
+    // Returns true in case of success, otherwise false
+    bool init();
+    // Cleans instances
+    void clean();
+  protected:
+    class Batch {
+    friend class Test;
+      private:
+        uint16_t _size = 0;
+      public:
+        uint16_t pointer = 0;
+        char **buffer = nullptr;
+        uint8_t retryCount = 0;
+        Batch(uint16_t size);
+        ~Batch();
+        bool append(const char *line);
+        char *createData();
+        void clear();
+        bool isFull() const {
+          return pointer == _size;
+        }
+        bool isEmpty() const {
+          return pointer == 0 && !buffer[0];
+        }
+    };
+    class BatchStreamer : public Stream {
+      private:
+        Batch *_batch;
+        int _length;
+        int _read;
+        uint16_t _pointer; //points to the item in batch
+        uint16_t _linePointer; //pointes to char in line of batch
+      public:
+        BatchStreamer(Batch *batch) ;
+        virtual ~BatchStreamer() {};
+
+          // Stream overrides
+        virtual int available() override;
+
+        virtual int availableForWrite() override;
+
+        virtual int read() override;
+#if defined(ESP8266)        
+        virtual int read(uint8_t* buffer, size_t len) override;
+#endif
+        virtual size_t readBytes(char* buffer, size_t len) override;
+
+        virtual void flush() override {};
+        virtual int peek()  override;
+
+        virtual size_t write(uint8_t data) override;
+
+    };
+    ConnectionInfo _connInfo;  
+    // Cached full write url
+    String _writeUrl;
+    // Cached full query url
+    String _queryUrl;
+    // Points buffer
+    Batch **_writeBuffer = nullptr;
+    // Batch buffer size
+    uint8_t _writeBufferSize;
+    // Write options
+    WriteOptions _writeOptions;
+    // Store retry timeout suggested by server or computed
+    int _retryTime = 0; 
+    // HTTP operations object
+    HTTPService *_service = nullptr;
+    // Index to buffer where to store new batch
+    uint8_t _bufferPointer = 0;
+    // Actual count of batches in buffer 
+    uint8_t _bufferCeiling = 0;
+    // Index of bath start for next write
+    uint8_t _batchPointer = 0;
+    // Last time in sec buffer has been successfully flushed
+    uint32_t _lastFlushed;
+    // Bucket sub-client
+    BucketsClient _buckets;
+    // Write using buffer or stream
+    bool _streamWrite = false;
+  protected:    
+    // Sends POST request with data in body
+    int postData(const char *data);
+    int postData(Batch *batch);
+      // Sets cached InfluxDB server API URLs
+    bool setUrls();
+    // Ensures buffer has required size
+    void reserveBuffer(int size);
+    // Drops current batch and advances batch pointer
+    void dropCurrentBatch();
+    // Writes all points in buffer, with respect to the batch size, and in case of success clears the buffer.
+    //  flashOnlyFull - whether to flush only full batches
+    // Returns true if successful, false in case of any error 
+    bool flushBufferInternal(bool flashOnlyFull);
+    // Checks precision of point and mofifies if needed
+    void checkPrecisions(Point & point);
+    // helper which adds zeroes to timestamo of point to increase precision
+    static void addZerosToTimestamp(Point &point, int zeroes);
+};
+
+
+#endif //_INFLUXDB_CLIENT_H_

firmware/libraries/ESP8266_Influxdb/src/InfluxDbCloud.h

@@ -0,0 +1,68 @@
+/**
+ * 
+ * InfluxDBCloud.h: InfluxDB Client for Arduino
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2020 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#ifndef _INFLUXDB_CLOUD_H_
+#define _INFLUXDB_CLOUD_H_
+
+// Root Certificate Authority of InfluxData Cloud 2 servers. 
+// Valid with all providers (AWS, Azure, GCP) 
+// ISRG Root X1
+// Valid until 2035-04-04T04:04:38Z
+const char InfluxDbCloud2CACert[] PROGMEM =  R"EOF( 
+-----BEGIN CERTIFICATE-----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=
+-----END CERTIFICATE-----
+)EOF";
+
+#endif //_INFLUXDB_CLOUD_H_

firmware/libraries/ESP8266_Influxdb/src/Options.cpp

@@ -0,0 +1,43 @@
+/**
+ * 
+ * Options.cpp: InfluxDB Client write options and HTTP options
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2020 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#include <Arduino.h>
+#include "Options.h"
+#include "util/helpers.h"
+
+WriteOptions& WriteOptions::addDefaultTag(const String &name, const String &value) { 
+    if(_defaultTags.length() > 0) {
+        _defaultTags += ',';
+    }
+    char *s = escapeKey(name);
+    _defaultTags += s;
+    delete [] s;
+    s = escapeKey(value);
+    _defaultTags += '=';
+    _defaultTags += s;
+    delete [] s;
+    return *this; 
+}

firmware/libraries/ESP8266_Influxdb/src/Options.h

@@ -0,0 +1,112 @@
+/**
+ * 
+ * Options.h: InfluxDB Client write options and HTTP options
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2020 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#ifndef _OPTIONS_H_
+#define _OPTIONS_H_
+
+#include "WritePrecision.h"
+
+class InfluxDBClient;
+class HTTPService;
+class Influxdb;
+class Test;
+
+/**
+ * WriteOptions holds write related options
+ */
+class WriteOptions {
+private:
+    friend class InfluxDBClient;
+    friend class Influxdb;
+    friend class Test;
+    // Points timestamp precision
+    WritePrecision _writePrecision; 
+    // Number of points that will be written to the databases at once. 
+    // Default 1 (immediate write, no batching)
+    uint16_t _batchSize;
+    // Write buffer size - maximum number of record to keep.
+    // When max size is reached, oldest records are overwritten.
+    // Default 5
+    uint16_t _bufferSize;
+    // Maximum number of seconds points can be held in buffer before are written to the db. 
+    // Buffer is flushed when it reaches batch size or when flush interval runs out. 
+    uint16_t _flushInterval;
+    // Default retry interval in sec, if not sent by server. Default 5s. 
+    // Setting to zero disables retrying.
+    uint16_t _retryInterval;
+    // Maximum retry interval in sec, default 5min (300s)
+    uint16_t _maxRetryInterval;
+    // Maximum count of retry attempts of failed writes, default 3
+    uint16_t _maxRetryAttempts;
+    // Default tags. Default tags are added to every written point. 
+    // There cannot be duplicate tags in default tags and tags included in a point.
+    String _defaultTags;
+public:
+    WriteOptions():
+        _writePrecision(WritePrecision::NoTime),
+        _batchSize(1),
+        _bufferSize(5),
+        _flushInterval(60),
+        _retryInterval(5),
+        _maxRetryInterval(300),
+        _maxRetryAttempts(3) {
+        }
+    WriteOptions& writePrecision(WritePrecision precision) { _writePrecision = precision; return *this; }
+    WriteOptions& batchSize(uint16_t batchSize) { _batchSize = batchSize; return *this; }
+    WriteOptions& bufferSize(uint16_t bufferSize) { _bufferSize = bufferSize; return *this; }
+    WriteOptions& flushInterval(uint16_t flushIntervalSec) { _flushInterval = flushIntervalSec; return *this; }
+    WriteOptions& retryInterval(uint16_t retryIntervalSec) { _retryInterval = retryIntervalSec; return *this; }
+    WriteOptions& maxRetryInterval(uint16_t maxRetryIntervalSec) { _maxRetryInterval = maxRetryIntervalSec; return *this; }
+    WriteOptions& maxRetryAttempts(uint16_t maxRetryAttempts) { _maxRetryAttempts = maxRetryAttempts; return *this; }
+    WriteOptions& addDefaultTag(const String &name, const String &value);
+    WriteOptions& clearDefaultTags() { _defaultTags = (char *)nullptr; return *this; }
+};
+
+/**
+ * HTTPOptions holds HTTP related options
+ */
+class HTTPOptions {
+private:    
+    friend class InfluxDBClient;
+    friend class HTTPService;
+    friend class Influxdb;
+    friend class Test;
+    // true if HTTP connection should be kept open. Usable for frequent writes.
+    // Default false.
+    bool _connectionReuse;
+    // Timeout [ms] for reading server response.
+    // Default 5000ms  
+    int _httpReadTimeout;
+public:
+    HTTPOptions():
+        _connectionReuse(false),
+        _httpReadTimeout(5000) {
+        }
+    HTTPOptions& connectionReuse(bool connectionReuse) { _connectionReuse = connectionReuse; return *this; }
+    HTTPOptions& httpReadTimeout(int httpReadTimeoutMs) { _httpReadTimeout = httpReadTimeoutMs; return *this; }
+};
+
+#endif //_OPTIONS_H_

firmware/libraries/ESP8266_Influxdb/src/Platform.h

@@ -0,0 +1,17 @@
+#ifndef _PLATFORM_H_
+#define _PLATFORM_H_
+
+#include <core_version.h>
+
+#define STRHELPER(x) #x
+#define STR(x) STRHELPER(x) // stringifier
+
+#if defined(ESP8266)
+# define INFLUXDB_CLIENT_PLATFORM "ESP8266"
+# define INFLUXDB_CLIENT_PLATFORM_VERSION  STR(ARDUINO_ESP8266_GIT_DESC)
+#elif defined(ESP32)
+# define INFLUXDB_CLIENT_PLATFORM "ESP32"
+# define INFLUXDB_CLIENT_PLATFORM_VERSION  STR(ARDUINO_ESP32_GIT_DESC)
+#endif
+
+#endif //_PLATFORM_H_

firmware/libraries/ESP8266_Influxdb/src/Point.cpp

@@ -0,0 +1,203 @@
+/**
+ * 
+ * Point.cpp: Point for write into InfluxDB server
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2020 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+
+#include "Point.h"
+#include "util/helpers.h"
+
+Point::Point(const String & measurement)
+{
+    _measurement = escapeKey(measurement, false);
+    _timestamp = nullptr;
+    _tsWritePrecision = WritePrecision::NoTime;
+}
+
+Point::~Point() {
+    delete [] _measurement;
+    delete [] _timestamp;
+}
+
+void Point::addTag(const String &name, String value) {
+    if(_tags.length() > 0) {
+        _tags += ',';
+    }
+    char *s = escapeKey(name);
+    _tags += s;
+    delete [] s;
+    _tags += '=';
+    s = escapeKey(value);
+    _tags += s;
+    delete [] s;
+}
+
+void Point::addField(const String &name, long long value) {
+  char buff[23];
+  snprintf(buff, 50, "%lld", value);
+  putField(name, String(buff)+"i");
+}
+
+void Point::addField(const String &name, unsigned long long value) {
+  char buff[23];
+  snprintf(buff, 50, "%llu", value);
+  putField(name, String(buff)+"i");
+}
+
+void Point::addField(const String &name, const char *value) { 
+    putField(name, escapeValue(value)); 
+}
+
+void Point::addField(const String &name, const __FlashStringHelper *pstr) {
+    addField(name, String(pstr));
+}
+
+void Point::addField(const String &name, float value, int decimalPlaces) { 
+    if(!isnan(value)) putField(name, String(value, decimalPlaces)); 
+}
+
+void Point::addField(const String &name, double value, int decimalPlaces) {
+    if(!isnan(value)) putField(name, String(value, decimalPlaces)); 
+}
+
+void Point::addField(const String &name, char value) { 
+    addField(name, String(value).c_str()); 
+}
+
+void Point::addField(const String &name, unsigned char value) {
+    putField(name, String(value)+"i"); 
+}
+
+void Point::addField(const String &name, int value) { 
+    putField(name, String(value)+"i"); 
+}
+
+void Point::addField(const String &name, unsigned int value) { 
+    putField(name, String(value)+"i"); 
+}
+
+void Point::addField(const String &name, long value)  { 
+    putField(name, String(value)+"i"); 
+}
+
+void Point::addField(const String &name, unsigned long value) { 
+    putField(name, String(value)+"i"); 
+}
+
+void Point::addField(const String &name, bool value)  { 
+    putField(name, bool2string(value)); 
+}
+
+void Point::addField(const String &name, const String &value)  { 
+    addField(name, value.c_str()); 
+}
+
+void Point::putField(const String &name, const String &value) {
+    if(_fields.length() > 0) {
+        _fields += ',';
+    }
+    char *s = escapeKey(name);
+    _fields += s;
+    delete [] s;
+    _fields += '=';
+    _fields += value;
+}
+
+String Point::toLineProtocol(const String &includeTags) const {
+    return createLineProtocol(includeTags);
+}
+
+String Point::createLineProtocol(const String &incTags) const {
+    String line;
+    line.reserve(strLen(_measurement) + 1 + incTags.length() + 1 + _tags.length() + 1 + _fields.length() + 1 + strLen(_timestamp));
+    line += _measurement;
+    if(incTags.length()>0) {
+        line += ",";
+        line += incTags;
+    }
+    if(hasTags()) {
+        line += ",";
+        line += _tags;
+    }
+    if(hasFields()) {
+        line += " ";
+        line += _fields;
+    }
+    if(hasTime()) {
+        line += " ";
+        line += _timestamp;
+    }
+    return line;
+ }
+
+void  Point::setTime(WritePrecision precision) {
+    struct timeval tv;
+    gettimeofday(&tv, NULL);
+    
+    switch(precision) {
+        case WritePrecision::NS:
+            setTime(getTimeStamp(&tv,9));
+            break;
+        case WritePrecision::US:
+            setTime(getTimeStamp(&tv,6));
+            break;
+        case WritePrecision::MS: 
+            setTime(getTimeStamp(&tv,3));
+            break;
+        case WritePrecision::S:
+            setTime(getTimeStamp(&tv,0));
+            break;
+        case WritePrecision::NoTime:
+            setTime((char *)nullptr);
+            break;
+    }
+    _tsWritePrecision = precision;
+}
+
+void  Point::setTime(unsigned long long timestamp) {
+    setTime(timeStampToString(timestamp));
+}
+
+void Point::setTime(const String &timestamp) {
+    setTime(cloneStr(timestamp.c_str()));
+}
+
+void Point::setTime(const char *timestamp) {
+    setTime(cloneStr(timestamp));    
+}
+
+void Point::setTime(char *timestamp) {
+    delete [] _timestamp;
+    _timestamp = timestamp;
+}
+
+void  Point::clearFields() {
+    _fields = (char *)nullptr;
+    delete [] _timestamp;
+    _timestamp = nullptr;
+}
+
+void Point:: clearTags() {
+    _tags = (char *)nullptr;
+}

firmware/libraries/ESP8266_Influxdb/src/Point.h

@@ -0,0 +1,96 @@
+/**
+ * 
+ * Point.h: Point for write into InfluxDB server
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2020 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#ifndef _POINT_H_
+#define _POINT_H_
+
+#include <Arduino.h>
+#include "WritePrecision.h"
+#include "util/helpers.h"
+
+/**
+ * Class Point represents InfluxDB point in line protocol.
+ * It defines data to be written to InfluxDB.
+ */
+class Point {
+friend class InfluxDBClient;
+  public:
+    Point(const String &measurement);
+    virtual ~Point();
+    // Adds string tag 
+    void addTag(const String &name, String value);
+    // Add field with various types
+    void addField(const String &name, float value, int decimalPlaces = 2);
+    void addField(const String &name, double value, int decimalPlaces = 2);
+    void addField(const String &name, char value);
+    void addField(const String &name, unsigned char value);
+    void addField(const String &name, int value);
+    void addField(const String &name, unsigned int value);
+    void addField(const String &name, long value);
+    void addField(const String &name, unsigned long value);
+    void addField(const String &name, bool value);
+    void addField(const String &name, const String &value);
+    void addField(const String &name, const __FlashStringHelper *pstr);
+    void addField(const String &name, long long value);
+    void addField(const String &name, unsigned long long value);
+    void addField(const String &name, const char *value);
+    // Set timestamp to `now()` and store it in specified precision, nanoseconds by default. Date and time must be already set. See `configTime` in the device API
+    void setTime(WritePrecision writePrecision = WritePrecision::NS);
+    // Set timestamp in offset since epoch (1.1.1970). Correct precision must be set InfluxDBClient::setWriteOptions.
+    void setTime(unsigned long long timestamp);
+    // Set timestamp in offset since epoch (1.1.1970 00:00:00). Correct precision must be set InfluxDBClient::setWriteOptions.
+    void setTime(const String &timestamp);
+    // Set timestamp in offset since epoch (1.1.1970 00:00:00). Correct precision must be set InfluxDBClient::setWriteOptions.
+    void setTime(const char *timestamp);
+    // Clear all fields. Usefull for reusing point  
+    void clearFields();
+    // Clear tags
+    void clearTags();
+    // True if a point contains at least one field. Points without a field cannot be written to db
+    bool hasFields() const { return _fields.length() > 0; }
+    // True if a point contains at least one tag
+    bool hasTags() const   { return _tags.length() > 0; }
+    // True if a point contains timestamp
+    bool hasTime() const   { return strLen(_timestamp) > 0; }
+    // Creates line protocol with optionally added tags
+    String toLineProtocol(const String &includeTags = "") const;
+    // returns current timestamp
+    String getTime() const { return _timestamp; } 
+  protected:
+    char *_measurement;
+    String _tags;
+    String _fields;
+    char *_timestamp;
+    WritePrecision _tsWritePrecision;
+  protected:    
+    // method for formating field into line protocol
+    void putField(const String &name, const String &value);
+    // set timestamp
+    void setTime(char *timestamp);
+    // Creates line protocol string
+    String createLineProtocol(const String &incTags) const;
+};
+#endif //_POINT_H_

firmware/libraries/ESP8266_Influxdb/src/Version.h

@@ -0,0 +1,32 @@
+/**
+ * 
+ * Version.h: Version constant
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2020 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#ifndef _VERSION_H_
+#define _VERSION_H_
+
+#define INFLUXDB_CLIENT_VERSION "3.12.1"
+
+#endif //_VERSION_H_

firmware/libraries/ESP8266_Influxdb/src/WritePrecision.h

@@ -0,0 +1,43 @@
+/**
+ * 
+ * WritePrecision.h: Write precision for InfluxDB Client for Arduino
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2020 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#ifndef _WRITE_PRECISION_H_
+#define _WRITE_PRECISION_H_
+// Enum WritePrecision defines constants for specifying InfluxDB write prcecision
+enum class WritePrecision:uint8_t  {
+  // Specifyies that points has no timestamp (default). Server will assign timestamp. 
+  NoTime = 0,
+  // Seconds
+  S,
+  // Milli-seconds 
+  MS,
+  // Micro-seconds 
+  US,
+  // Nano-seconds
+  NS
+};
+
+#endif //_WRITE_PRECISION_H_

firmware/libraries/ESP8266_Influxdb/src/query/CsvReader.cpp

@@ -0,0 +1,108 @@
+/**
+ * 
+ * CsvReader.cpp: Simple Csv parser for comma separated values, with double quotes suppport
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2020 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#include "CsvReader.h"
+
+CsvReader::CsvReader(HttpStreamScanner *scanner) {
+    _scanner = scanner;
+}
+
+CsvReader::~CsvReader() {
+    delete _scanner;
+}
+
+std::vector<String> CsvReader::getRow() {
+    return _row;
+};
+
+void CsvReader::close() {
+    clearRow();
+    _scanner->close();
+}
+
+void CsvReader::clearRow() {
+    std::for_each(_row.begin(), _row.end(), [](String &value){ value = (const char *)nullptr; });
+    _row.clear();
+}
+
+enum class CsvParsingState {
+    UnquotedField,
+    QuotedField,
+    QuotedQuote
+};
+
+bool CsvReader::next() {
+     clearRow();
+     bool status = _scanner->next();
+     if(!status) {
+          _error =  _scanner->getError();
+         return false;
+     }
+    String line = _scanner->getLine();
+    CsvParsingState state = CsvParsingState::UnquotedField;
+    std::vector<String> fields {""};
+    size_t i = 0; // index of the current field
+    for (char c : line) {
+        switch (state) {
+            case CsvParsingState::UnquotedField:
+                switch (c) {
+                    case ',': // end of field
+                              fields.push_back(""); i++;
+                              break;
+                    case '"': state = CsvParsingState::QuotedField;
+                              break;
+                    default:  fields[i] += c;
+                              break; 
+                }
+                break;
+            case CsvParsingState::QuotedField:
+                switch (c) {
+                    case '"': state = CsvParsingState::QuotedQuote;
+                              break;
+                    default:  fields[i] += c;
+                              break; 
+                }
+                break;
+            case CsvParsingState::QuotedQuote:
+                switch (c) {
+                    case ',': // , after closing quote
+                              fields.push_back(""); i++;
+                              state = CsvParsingState::UnquotedField;
+                              break;
+                    case '"': // "" -> "
+                              fields[i] += '"';
+                              state = CsvParsingState::QuotedField;
+                              break;
+                    default:  // end of quote
+                              state = CsvParsingState::UnquotedField;
+                              break; 
+                }
+                break;
+        }
+    }
+    _row = fields;
+    return true;
+}

firmware/libraries/ESP8266_Influxdb/src/query/CsvReader.h

@@ -0,0 +1,51 @@
+/**
+ * 
+ * CsvReader.h: Simple Csv parser for comma separated values, with double quotes suppport
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2020 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#ifndef _CSV_READER_
+#define _CSV_READER_
+
+#include "HttpStreamScanner.h"
+#include <vector>
+
+/**
+ * CsvReader parses csv line to token by ',' (comma) character.
+ * It suppports escaped  quotes, excaped comma
+ **/
+class CsvReader {
+public:
+    CsvReader(HttpStreamScanner *scanner);
+    ~CsvReader();
+    bool next();
+    void close();
+    std::vector<String> getRow();
+    int getError() const { return _error; };
+private:
+    void clearRow();
+    HttpStreamScanner *_scanner = nullptr;
+    std::vector<String> _row;
+    int _error = 0;
+};
+#endif //_CSV_READER_

firmware/libraries/ESP8266_Influxdb/src/query/FluxParser.cpp

@@ -0,0 +1,275 @@
+/**
+ * 
+ * FluxParser.cpp: InfluxDB flux query result parser
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2018-2020 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+
+#include "FluxParser.h"
+// Uncomment bellow in case of a problem and rebuild sketch
+//#define INFLUXDB_CLIENT_DEBUG_ENABLE
+#include "util/debug.h"
+
+FluxQueryResult::FluxQueryResult(CsvReader *reader) {
+    _data = std::make_shared<Data>(reader);
+}
+
+FluxQueryResult::FluxQueryResult(const String &error):FluxQueryResult((CsvReader *)nullptr) {
+    _data->_error = error;
+}
+
+FluxQueryResult::FluxQueryResult(const FluxQueryResult &other) {
+    _data = other._data;
+}
+FluxQueryResult &FluxQueryResult::operator=(const FluxQueryResult &other) {
+    if(this != &other) {
+        _data = other._data;
+    }
+    return *this;
+}
+
+FluxQueryResult::~FluxQueryResult() {
+}
+
+int FluxQueryResult::getColumnIndex(const String &columnName) {
+    int i = -1;
+    std::vector<String>::iterator it = find(_data->_columnNames.begin(), _data->_columnNames.end(), columnName);
+    if (it != _data->_columnNames.end()) {
+        i = distance(_data->_columnNames.begin(), it);
+    }
+    return i;
+}
+
+FluxValue FluxQueryResult::getValueByIndex(int index) {
+    FluxValue ret;
+    if(index >= 0 && index < (int)_data->_columnValues.size()) {
+        ret = _data->_columnValues[index];
+    }
+    return ret;
+}
+
+FluxValue FluxQueryResult::getValueByName(const String &columnName) {
+    FluxValue ret;
+    int i = getColumnIndex(columnName);
+    if(i > -1) {
+        ret = getValueByIndex(i);
+    }
+    return ret;
+}
+
+void FluxQueryResult::close() {
+    clearValues();
+    clearColumns();
+    if(_data->_reader) {
+        _data->_reader->close();
+    }
+}
+
+void FluxQueryResult::clearValues() {
+    std::for_each(_data->_columnValues.begin(), _data->_columnValues.end(), [](FluxValue &value){ value = nullptr; });
+    _data->_columnValues.clear();
+}
+
+void FluxQueryResult::clearColumns() {
+    std::for_each(_data->_columnNames.begin(), _data->_columnNames.end(), [](String &value){ value = (const char *)nullptr; });
+    _data->_columnNames.clear();
+
+    std::for_each(_data->_columnDatatypes.begin(), _data->_columnDatatypes.end(), [](String &value){ value = (const char *)nullptr; });
+    _data->_columnDatatypes.clear();
+}
+
+FluxQueryResult::Data::Data(CsvReader *reader):_reader(reader) {}
+
+FluxQueryResult::Data::~Data() { 
+    delete _reader;
+}
+
+enum ParsingState {
+    ParsingStateNormal = 0, 
+	ParsingStateNameRow,
+	ParsingStateError
+};
+
+bool FluxQueryResult::next() {
+    if(!_data->_reader) {
+        return false;
+    }
+    ParsingState parsingState = ParsingStateNormal;
+    _data->_tableChanged = false;
+    clearValues();
+    _data->_error = "";
+readRow:
+    bool stat = _data->_reader->next();
+    if(!stat) {
+        if(_data->_reader->getError()< 0) {
+            _data->_error = HTTPClient::errorToString(_data->_reader->getError());
+            INFLUXDB_CLIENT_DEBUG("Error '%s'\n", _data->_error.c_str());
+        }
+        return false;
+    }
+    std::vector<String> vals = _data->_reader->getRow();
+    INFLUXDB_CLIENT_DEBUG("[D] FluxQueryResult: vals.size %d\n", vals.size());
+    if(vals.size() < 2) {
+        goto readRow;
+    }
+    if(vals[0] == "") {
+		if (parsingState == ParsingStateError) {
+			String message ;
+			if (vals.size() > 1 && vals[1].length() > 0) {
+				message = vals[1];
+			} else {
+				message = F("Unknown query error");
+			}
+			String reference = "";
+            if (vals.size() > 2 && vals[2].length() > 0) {
+				reference = "," + vals[2];
+			}
+			_data->_error =  message + reference;
+            INFLUXDB_CLIENT_DEBUG("Error '%s'\n", _data->_error.c_str());
+			return false;
+		} else if (parsingState == ParsingStateNameRow) {
+			if (vals[1] == "error") {
+				parsingState = ParsingStateError;
+			} else {
+                if (vals.size()-1 != _data->_columnDatatypes.size()) {
+                   _data->_error = String(F("Parsing error, header has different number of columns than table: ")) + String(vals.size()-1) + " vs " + String(_data->_columnDatatypes.size());
+                   INFLUXDB_CLIENT_DEBUG("Error '%s'\n", _data->_error.c_str());
+			       return false;
+                } else {
+                    for(unsigned int i=1;i < vals.size(); i++) {
+                        _data->_columnNames.push_back(vals[i]);
+                    }
+                }
+				parsingState = ParsingStateNormal;
+			}
+			goto readRow;
+		}
+		if(_data->_columnDatatypes.size() == 0) {
+			_data->_error = F("Parsing error, datatype annotation not found");
+            INFLUXDB_CLIENT_DEBUG("Error '%s'\n", _data->_error.c_str());
+			return false;
+		}
+		if (vals.size()-1 != _data->_columnNames.size()) {
+			_data->_error = String(F("Parsing error, row has different number of columns than table: ")) + String(vals.size()-1) + " vs " + String(_data->_columnNames.size());
+            INFLUXDB_CLIENT_DEBUG("Error '%s'\n", _data->_error.c_str());
+			return false;
+		}
+		for(unsigned int i=1;i < vals.size(); i++) {
+            FluxBase *v  = nullptr;
+            if(vals[i].length() > 0) {
+                v = convertValue(vals[i], _data->_columnDatatypes[i-1]);
+                if(!v) {
+                    _data->_error = String(F("Unsupported datatype: ")) + _data->_columnDatatypes[i-1];
+                    INFLUXDB_CLIENT_DEBUG("Error '%s'\n", _data->_error.c_str());
+                    return false;
+                }
+            }  
+            FluxValue val(v);
+            _data->_columnValues.push_back(val);
+		}
+    } else if(vals[0] == "#datatype") {
+		_data->_tablePosition++;
+        clearColumns();
+        _data->_tableChanged = true;
+		for(unsigned int i=1;i < vals.size(); i++) {
+			_data->_columnDatatypes.push_back(vals[i]);
+		}
+		parsingState = ParsingStateNameRow;
+		goto readRow;
+	} else {
+        goto readRow;
+    }
+	return true;
+}
+
+FluxDateTime *FluxQueryResult::convertRfc3339(String &value, const char *type) {
+    tm t = {0,0,0,0,0,0,0,0,0};
+    // has the time part
+    int zet = value.indexOf('Z');
+    unsigned long fracts = 0;
+    if(value.indexOf('T') > 0 && zet > 0) { //Full datetime string - 2020-05-22T11:25:22.037735433Z
+        int f = sscanf(value.c_str(),"%d-%d-%dT%d:%d:%d", &t.tm_year,&t.tm_mon,&t.tm_mday, &t.tm_hour,&t.tm_min,&t.tm_sec);
+        if(f != 6) {
+            return nullptr;
+        }
+        t.tm_year -= 1900; //adjust to years after 1900
+        t.tm_mon -= 1; //adjust to range 0-11
+        int dot = value.indexOf('.');
+        
+        if(dot > 0) {
+            int tail = zet;
+            int len = zet-dot-1;
+            if (len > 6) {
+                tail = dot + 7; 
+                len = 6;
+            }
+            String secParts = value.substring(dot+1, tail);
+            fracts = strtoul((const char *) secParts.c_str(), NULL, 10);
+            if(len < 6) {
+                fracts *= 10^(6-len); 
+            }
+        }
+    } else {
+        int f = sscanf(value.c_str(),"%d-%d-%d", &t.tm_year,&t.tm_mon,&t.tm_mday);
+        if(f != 3) {
+            return nullptr;
+        }
+        t.tm_year -= 1900; //adjust to years after 1900
+        t.tm_mon -= 1; //adjust to range 0-11
+    }
+    return new FluxDateTime(value, type, t, fracts);
+}
+
+FluxBase *FluxQueryResult::convertValue(String &value, String &dataType) {
+    FluxBase *ret = nullptr;
+    if(dataType.equals(FluxDatatypeDatetimeRFC3339) || dataType.equals(FluxDatatypeDatetimeRFC3339Nano)) {
+        const char *type = FluxDatatypeDatetimeRFC3339;
+        if(dataType.equals(FluxDatatypeDatetimeRFC3339Nano)) {
+            type = FluxDatatypeDatetimeRFC3339Nano;
+        }
+        ret = convertRfc3339(value, type);
+        if (!ret) {
+            _data->_error = String(F("Invalid value for '")) + dataType + F("': ") + value;
+        }
+    } else if(dataType.equals(FluxDatatypeDouble)) {
+        double val = strtod((const char *) value.c_str(), NULL);
+        ret = new FluxDouble(value, val);
+    } else if(dataType.equals(FluxDatatypeBool)) {
+        bool val = value.equalsIgnoreCase("true");
+        ret = new FluxBool(value, val);
+    } else if(dataType.equals(FluxDatatypeLong)) {
+        long l = strtol((const char *) value.c_str(), NULL, 10);
+        ret = new FluxLong(value, l);
+    } else if(dataType.equals(FluxDatatypeUnsignedLong)) {
+        unsigned long ul = strtoul((const char *) value.c_str(), NULL, 10);
+        ret = new FluxUnsignedLong(value, ul);
+    } else if(dataType.equals(FluxBinaryDataTypeBase64)) {
+        ret = new FluxString(value, FluxBinaryDataTypeBase64);
+    } else if(dataType.equals(FluxDatatypeDuration)) {
+        ret = new FluxString(value, FluxDatatypeDuration);
+    } else if(dataType.equals(FluxDatatypeString)) {
+        ret = new FluxString(value, FluxDatatypeString);
+    }
+    return ret;
+}
+

firmware/libraries/ESP8266_Influxdb/src/query/FluxParser.h

@@ -0,0 +1,109 @@
+/**
+ * 
+ * FLuxParser.h: InfluxDB flux query result parser
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2020 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#ifndef _FLUX_PARSER_H_
+#define _FLUX_PARSER_H_
+
+#include <vector>
+#include "CsvReader.h"
+#include "FluxTypes.h"
+
+
+/**
+ * FluxQueryResult represents result from InfluxDB flux query.
+ * It parses stream from server, line by line, so it allows to read a huge responses.
+ * 
+ * Browsing thought the result is done by repeatedly calling the next() method, until it returns false.
+ * Unsuccesful reading is distinqushed by non empty value from getError().
+ * 
+ * As a flux query result can contain several tables differing by grouping key, use hasTableChanged() to
+ * know when there is a new table.
+ * 
+ * Single values are returned using getValueByIndex() or getValueByName() methods.
+ * All row values are retreived by getValues().
+ * 
+ * Always call close() at the of reading.
+ * 
+ * FluxQueryResult supports passing by value.
+ */
+class FluxQueryResult {
+public:
+    // Constructor for reading result
+    FluxQueryResult(CsvReader *reader);
+    // Constructor for error result
+    FluxQueryResult(const String &error);
+    // Copy constructor
+    FluxQueryResult(const FluxQueryResult &other);
+    // Assignment operator
+    FluxQueryResult &operator=(const FluxQueryResult &other);
+    // Advances to next values row in the result set.
+    // Returns true on successful reading new row, false means end of the result set 
+    // or an error. Call getError() and check non empty value
+    bool next();
+    // Returns index of the column, or -1 if not found
+    int getColumnIndex(const String &columnName);
+    // Returns a converted value by index, or nullptr in case of missing value or wrong index
+    FluxValue getValueByIndex(int index);
+    // Returns a result value by column name, or nullptr in case of missing value or wrong column name
+    FluxValue getValueByName(const String &columnName);
+    // Returns flux datatypes of all columns
+    std::vector<String> getColumnsDatatype() { return _data->_columnDatatypes; }
+    // Returns names of all columns
+    std::vector<String> getColumnsName()  { return  _data->_columnNames; }
+    // Returns all values from current row
+    std::vector<FluxValue> getValues() { return  _data->_columnValues; }
+    // Returns true if new table was encountered
+    bool hasTableChanged() const { return  _data->_tableChanged; }
+    // Returns current table position in the results set
+    int getTablePosition() const { return _data->_tablePosition; }
+    // Returns an error found during parsing if any, othewise empty string
+    String getError() { return  _data->_error; }
+    // Releases all resources and closes server reponse. It must be always called at end of reading.
+    void close();
+    // Descructor
+    ~FluxQueryResult();
+protected:
+    FluxBase *convertValue(String &value, String &dataType);
+    static FluxDateTime *convertRfc3339(String &value, const char *type);
+    void clearValues();
+    void clearColumns();
+private:
+    class Data {
+    public:
+        Data(CsvReader *reader);
+        ~Data();
+        CsvReader *_reader;
+        int _tablePosition = -1;
+        bool _tableChanged = false;
+        std::vector<String> _columnDatatypes;
+        std::vector<String> _columnNames;
+        std::vector<FluxValue> _columnValues;
+        String _error;
+    };
+    std::shared_ptr<Data> _data;
+};
+
+#endif //#_FLUX_PARSER_H_

firmware/libraries/ESP8266_Influxdb/src/query/FluxTypes.cpp

@@ -0,0 +1,239 @@
+/**
+ * 
+ * FluxTypes.cpp: InfluxDB flux query types support
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2018-2020 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+
+#include "FluxTypes.h"
+#include "util/helpers.h"
+
+const char	*FluxDatatypeString     = "string";
+const char	*FluxDatatypeDouble     = "double";
+const char	*FluxDatatypeBool       = "boolean";
+const char	*FluxDatatypeLong       = "long";
+const char	*FluxDatatypeUnsignedLong   = "unsignedLong";
+const char	*FluxDatatypeDuration       = "duration";
+const char	*FluxBinaryDataTypeBase64         = "base64Binary";
+const char	*FluxDatatypeDatetimeRFC3339      = "dateTime:RFC3339";
+const char	*FluxDatatypeDatetimeRFC3339Nano  = "dateTime:RFC3339Nano";
+
+FluxBase::FluxBase(const String &rawValue):_rawValue(rawValue) {
+}
+
+FluxBase::~FluxBase() {
+}
+
+
+FluxLong::FluxLong(const String &rawValue, long value):FluxBase(rawValue),value(value) {
+
+}
+
+const char *FluxLong::getType() {
+    return FluxDatatypeLong;
+}
+
+char *FluxLong::jsonString() {
+    int len  =_rawValue.length()+3+getNumLength(value)+2;
+    char *json = new char[len+1];
+    snprintf_P(json, len, PSTR("\"%s\":%ld"), _rawValue.c_str(), value);
+    return json;
+}
+
+
+FluxUnsignedLong::FluxUnsignedLong(const String &rawValue, unsigned long value):FluxBase(rawValue),value(value) {
+}
+
+const char *FluxUnsignedLong::getType() {
+    return FluxDatatypeUnsignedLong;
+}
+
+char *FluxUnsignedLong::jsonString() {
+  int len  =_rawValue.length()+3+getNumLength(value)+2;
+  char *json = new char[len+1];
+  snprintf_P(json,len, PSTR("\"%s\":%lu"), _rawValue.c_str(), value);
+  return json;
+}
+
+FluxDouble::FluxDouble(const String &rawValue, double value):FluxDouble(rawValue, value, 0) {
+   
+}
+
+FluxDouble::FluxDouble(const String &rawValue, double value, int precision):FluxBase(rawValue),
+  value(value),precision(precision) {}
+
+const char *FluxDouble::getType() {
+    return FluxDatatypeDouble;
+}
+
+char *FluxDouble::jsonString() {
+    int len = _rawValue.length()+3+getNumLength(value)+precision+2;
+    char *json = new char[len+1];
+    char format[10];
+    sprintf_P(format, PSTR("\"%%s\":%%.%df"), precision);
+    snprintf(json, len, format , _rawValue.c_str(), value);
+    return json;
+}
+
+FluxBool::FluxBool(const String &rawValue, bool value):FluxBase(rawValue),value(value) {   
+}
+
+const char *FluxBool::getType() {
+    return FluxDatatypeBool;
+}
+
+char *FluxBool::jsonString() {
+    int len = _rawValue.length()+9;
+    char *json = new char[len+1];
+    snprintf_P(json, len, PSTR("\"%s\":%s"), _rawValue.c_str(), bool2string(value));
+    return json;
+}
+
+
+FluxDateTime::FluxDateTime(const String &rawValue, const char *type, struct tm value, unsigned long microseconds):FluxBase(rawValue),_type(type),value(value), microseconds(microseconds) {
+
+}
+
+const char *FluxDateTime::getType() {
+    return _type;
+}
+
+String FluxDateTime::format(const String &formatString) {
+  int len = formatString.length() + 20; //+20 for safety
+  char *buff = new char[len];
+  strftime(buff,len, formatString.c_str(),&value);
+  String str = buff;
+  delete [] buff;
+  return str;
+}
+
+char *FluxDateTime::jsonString() {
+  int len = _rawValue.length()+3+21+(microseconds?10:0); 
+  char *buff = new char[len+1];
+  snprintf_P(buff, len, PSTR("\"%s\":\""), _rawValue.c_str());
+  strftime(buff+strlen(buff), len-strlen(buff), "%FT%T",&value);
+  if(microseconds) {
+    snprintf_P(buff+strlen(buff), len - strlen(buff), PSTR(".%06luZ"), microseconds); 
+  }
+  strcat(buff+strlen(buff), "\""); 
+  return buff;
+}
+
+FluxString::FluxString(const String &rawValue, const char *type):FluxString(rawValue, rawValue, type) {
+
+}
+
+FluxString::FluxString(const String &rawValue, const String &value, const char *type):FluxBase(rawValue),_type(type),value(value)
+{
+
+}
+
+const char *FluxString::getType() {
+  return _type;
+}
+
+char *FluxString::jsonString() {
+  int len = _rawValue.length()+value.length()+7;
+  char *buff = new char[len+1];
+  snprintf(buff, len, "\"%s\":\"%s\"", _rawValue.c_str(), value.c_str());
+  return buff;
+}
+
+
+FluxValue::FluxValue() {}
+
+FluxValue::FluxValue(FluxBase *fluxValue):_data(fluxValue) {
+    
+}
+
+FluxValue::FluxValue(const FluxValue &other) {
+    _data = other._data;
+}
+
+FluxValue& FluxValue::operator=(const FluxValue& other) {
+    if(this != &other) {
+        _data = other._data;
+    }
+    return *this;
+}
+
+// Type accessor. If value is different type zero value for given time is returned.
+String FluxValue::getString() {
+    if(_data && (_data->getType() == FluxDatatypeString ||_data->getType() == FluxDatatypeDuration || _data->getType() == FluxBinaryDataTypeBase64)) {
+            FluxString *s = (FluxString *)_data.get();
+            return s->value;
+        }
+    return "";
+}
+
+long FluxValue::getLong() {
+    if(_data && _data->getType() == FluxDatatypeLong) {
+        FluxLong *l = (FluxLong *)_data.get();
+        return l->value;
+    }
+    return 0;
+}
+
+unsigned long FluxValue::getUnsignedLong() {
+    if(_data && _data->getType() == FluxDatatypeUnsignedLong) {
+        FluxUnsignedLong *l = (FluxUnsignedLong *)_data.get();
+        return l->value;
+    }
+    return 0;
+
+}
+FluxDateTime FluxValue::getDateTime() {
+    if(_data && (_data->getType() == FluxDatatypeDatetimeRFC3339 ||_data->getType() == FluxDatatypeDatetimeRFC3339Nano)) {
+        FluxDateTime *d = (FluxDateTime *)_data.get();
+        return *d;
+    }
+    return FluxDateTime("",FluxDatatypeDatetimeRFC3339, {0,0,0,0,0,0,0,0,0}, 0 );
+}
+
+bool FluxValue::getBool() {
+    if(_data && _data->getType() == FluxDatatypeBool) {
+        FluxBool *b = (FluxBool *)_data.get();
+        return b->value;
+    }
+    return false;
+}
+
+double FluxValue::getDouble() {
+    if(_data && _data->getType() == FluxDatatypeDouble) {
+        FluxDouble *d = (FluxDouble *)_data.get();
+        return d->value;
+    }
+    return 0.0;
+}
+
+// returns string representation of non-string values
+String FluxValue::getRawValue() {
+    if(_data) {
+        return _data->getRawValue();
+    }
+    return "";
+}
+
+bool FluxValue::isNull() {
+    return _data == nullptr;
+}

firmware/libraries/ESP8266_Influxdb/src/query/FluxTypes.h

@@ -0,0 +1,178 @@
+/**
+ * 
+ * FLuxTypes.h: InfluxDB flux types representation
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2020 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#ifndef _FLUX_TYPES_H_
+#define _FLUX_TYPES_H_
+
+#include <Arduino.h>
+#include <memory>
+
+/** Supported flux types:
+ *  - long - converts to long
+ *  - unsignedLong - converts to unsigned long
+ *  - double - converts to double
+ *  - bool  - converts to bool
+ *  - dateTime:RFC3339 - converts to FluxDataTime
+ *  - dateTime:RFC3339Nano - converts to FluxDataTime
+ *  other types defaults to String
+ */
+
+extern const char	*FluxDatatypeString;
+extern const char	*FluxDatatypeDouble;
+extern const char	*FluxDatatypeBool;
+extern const char	*FluxDatatypeLong;
+extern const char	*FluxDatatypeUnsignedLong;
+extern const char	*FluxDatatypeDuration;
+extern const char	*FluxBinaryDataTypeBase64;
+extern const char	*FluxDatatypeDatetimeRFC3339;  
+extern const char	*FluxDatatypeDatetimeRFC3339Nano;
+
+// Base type for all specific flux types
+class FluxBase {
+protected:
+    String _rawValue;
+public:
+    FluxBase(const String &rawValue);
+    virtual ~FluxBase();
+    String getRawValue() const { return _rawValue; }
+    virtual const char *getType() = 0;
+    virtual char *jsonString() = 0;
+};
+
+// Represents flux long
+class FluxLong : public FluxBase {
+public:
+    FluxLong(const String &rawValue, long value);
+    long value;
+    virtual const char *getType() override;
+    virtual char *jsonString() override;
+};
+
+// Represents flux unsignedLong
+class FluxUnsignedLong : public FluxBase {
+public:
+    FluxUnsignedLong(const String &rawValue, unsigned long value);
+    unsigned long value;
+    virtual const char *getType() override;
+    virtual char *jsonString() override;
+};
+
+// Represents flux double
+class FluxDouble : public FluxBase {
+public:
+    FluxDouble(const String &rawValue, double value);
+    FluxDouble(const String &rawValue, double value, int precision);
+    double value;
+    // For JSON serialization
+    int precision;
+    virtual const char *getType() override;
+    virtual char *jsonString() override;
+};
+
+// Represents flux bool
+class FluxBool : public FluxBase {
+public:
+    FluxBool(const String &rawValue, bool value);
+    bool value;
+    virtual const char *getType() override;
+    virtual char *jsonString() override;
+};
+
+// Represents flux dateTime:RFC3339 and dateTime:RFC3339Nano
+// Date and time are stored in classic struct tm.
+// Fraction of second is stored in microseconds
+// There are several classic functions for using struct tm: http://www.cplusplus.com/reference/ctime/ 
+class FluxDateTime : public FluxBase {
+protected:
+    const char *_type;
+public:    
+    FluxDateTime(const String &rawValue, const char *type, struct tm value, unsigned long microseconds);
+    // Struct tm for date and time
+    struct tm value;
+    // microseconds part
+    unsigned long microseconds;
+    // Formats the value part to string according to the given format. Microseconds are skipped.
+    // Format string must be compatible with the http://www.cplusplus.com/reference/ctime/strftime/
+    String format(const String &formatString);
+    virtual const char *getType() override;
+    virtual char *jsonString() override;
+};
+
+// Represents flux string, duration, base64binary
+class FluxString : public FluxBase {
+protected:
+    const char *_type;
+public:
+    FluxString(const String &rawValue, const char *type);
+    FluxString(const String &rawValue, const String &value, const char *type);
+    String value;
+    virtual const char *getType() override;
+    virtual char *jsonString() override;
+};
+
+/** 
+ * FluxValue wraps a value from a flux query result column.
+ * It provides getter methods for supported flux types:
+ *  * getString() - string, base64binary or duration
+ *  * getLong() - long
+ *  * getUnsignedLong() - unsignedLong
+ *  * getDateTime() - dateTime:RFC3339 or dateTime:RFC3339Nano
+ *  * getBool() - bool
+ *  * getDouble() - double
+ * 
+ * Calling improper type getter will result in zero (empty) value.
+ * Check for null value using isNull().
+ * Use getRawValue() for getting original string form.
+ * 
+ **/
+
+class FluxValue {
+public:
+    FluxValue();
+    FluxValue(FluxBase *value);
+    FluxValue(const FluxValue &other);
+    FluxValue& operator=(const FluxValue& other);
+    // Check if value represent null - not present - value.
+    bool isNull();
+    // Returns a value of string, base64binary or duration type column, or empty string if column is a different type.
+    String getString();
+    // Returns a value of long type column, or zero if column is a different type.
+    long getLong();
+    // Returns a value of unsigned long type column, or zero if column is a different type.
+    unsigned long getUnsignedLong();
+    // Returns a value of dateTime:RFC3339 or dateTime:RFC3339Nano, or zeroed FluxDateTime instance if column is a different type.
+    FluxDateTime getDateTime();
+    // Returns a value of bool type column, or false if column is a different type.
+    bool getBool();
+    // Returns a value of double type column, or 0.0 if column is a different type.
+    double getDouble();
+    // Returns a value in the original string form, as presented in the response.
+    String getRawValue();
+private:    
+    std::shared_ptr<FluxBase> _data;
+};
+
+#endif //_FLUX_TYPES_H_

firmware/libraries/ESP8266_Influxdb/src/query/HttpStreamScanner.cpp

@@ -0,0 +1,104 @@
+/**
+ * 
+ * HttpStreamScanner.cpp: Scannes HttpClient stream for lines. Supports chunking.
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2020 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#include "HttpStreamScanner.h"
+
+// Uncomment bellow in case of a problem and rebuild sketch
+//#define INFLUXDB_CLIENT_DEBUG_ENABLE
+#include "util/debug.h"
+#include "util/helpers.h"
+
+HttpStreamScanner::HttpStreamScanner(HTTPClient *client, bool chunked)
+{
+    _client = client;
+    _stream = client->getStreamPtr();
+    _chunked = chunked;
+    _chunkHeader = chunked;
+    _len = client->getSize();
+    INFLUXDB_CLIENT_DEBUG("[D] HttpStreamScanner: chunked: %s, size: %d\n", bool2string(_chunked), _len);
+}
+
+bool HttpStreamScanner::next() {
+    while(_client->connected() && (_len > 0 || _len == -1)) {
+        _line = _stream->readStringUntil('\n');
+        INFLUXDB_CLIENT_DEBUG("[D] HttpStreamScanner: line: %s\n", _line.c_str());
+        ++_linesNum;
+        int lineLen = _line.length();
+        if(lineLen == 0) {
+            _error = HTTPC_ERROR_READ_TIMEOUT;
+            return false;
+        } 
+        int r = lineLen +1; //+1 for terminating \n
+        _line.trim(); //remove \r
+        if(!_chunked || !_chunkHeader) {
+            _read += r;
+            if(_lastChunkLine.length() > 0) { //fix broken line
+                _line = _lastChunkLine + _line;
+                _lastChunkLine = "";
+            }
+        
+        } 
+        if(_chunkHeader && r == 2) { //empty line at the end of chunk
+            //last line was complete so return
+            _line  = _lastChunkLine;
+            _lastChunkLine = "";
+            return true;
+        }
+        if(_chunkHeader){
+            _chunkLen = (int) strtol((const char *) _line.c_str(), NULL, 16);
+            INFLUXDB_CLIENT_DEBUG("[D] HttpStreamScanner chunk len: %d\n", _chunkLen);
+            _chunkHeader = false;
+            _read = 0;
+            if(_chunkLen == 0) { //last chunk
+                _error = 0;
+                _line = "";
+                return false;
+            } else {
+                continue;
+            }
+        } else if(_chunked && _read >= _chunkLen){ //we reached end of chunk. 
+            _lastChunkLine = _line;
+            _chunkHeader = true;
+            continue;
+        }
+        
+        if(_len > 0) {
+            _len -= r;
+            INFLUXDB_CLIENT_DEBUG("[D] HttpStreamScanner new len: %d\n", _len);
+        }
+        return true;
+    }
+    if(!_client->connected() && ( (_chunked && _chunkLen > 0) || (!_chunked && _len > 0))) { //report error only if we didn't went to 
+        _error = HTTPC_ERROR_CONNECTION_LOST;
+        INFLUXDB_CLIENT_DEBUG("HttpStreamScanner connection lost\n");
+    } 
+    return false;
+}
+
+void HttpStreamScanner::close() {
+    _client->end();
+}
+

firmware/libraries/ESP8266_Influxdb/src/query/HttpStreamScanner.h

@@ -0,0 +1,64 @@
+/**
+ * 
+ * HttpStreamScanner.h:  Scannes HttpClient stream for lines. Supports chunking.
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2020 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#ifndef _HTTP_STREAM_SCANNER_
+#define _HTTP_STREAM_SCANNER_
+
+#if defined(ESP8266)
+# include <ESP8266HTTPClient.h>
+#elif defined(ESP32)
+# include <HTTPClient.h>
+#endif //ESP8266
+
+/** 
+ * HttpStreamScanner parses response stream from  HTTPClient for lines.
+ * By repeatedly calling next() it searches for new line.
+ * If next() returns false, it can mean end of stream or an error.
+ * Check getError() for nonzero if an error occured
+ */ 
+class HttpStreamScanner {
+public:
+    HttpStreamScanner(HTTPClient *client, bool chunked);
+    bool next();
+    void close();
+    const String &getLine() const { return _line; }
+    int getError() const { return _error; }
+    int getLinesNum() const {return _linesNum; }
+private:
+    HTTPClient *_client;
+    Stream *_stream = nullptr;
+    int _len;
+    String _line;
+    int _linesNum= 0;
+    int _read = 0;
+    bool _chunked;
+    bool _chunkHeader;
+    int _chunkLen = 0;
+    String _lastChunkLine;
+    int _error = 0;
+};
+
+#endif //#_HTTP_STREAM_SCANNER_

firmware/libraries/ESP8266_Influxdb/src/query/Params.cpp

@@ -0,0 +1,151 @@
+/**
+ * 
+ * Params.cpp: InfluxDB flux query param
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2020 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+
+#include "Params.h"
+#include <algorithm>
+
+QueryParams::QueryParams() {
+  _data = std::make_shared<ParamsList>();
+}
+
+
+QueryParams::QueryParams(const QueryParams& other) {
+  _data = other._data;
+}
+
+ QueryParams::~QueryParams() {
+   if(_data) {
+    std::for_each(_data->begin(), _data->end(), [](FluxBase *&value){ delete value; });
+    _data->clear();
+   }
+ }
+
+QueryParams &QueryParams::operator=(const QueryParams &other) {
+  if(this != &other) {
+    _data = other._data;
+  }
+  return *this;
+}
+
+QueryParams &QueryParams::add(const String &name, float value, int decimalPlaces) {
+  return add(name, (double)value, decimalPlaces);
+}
+
+QueryParams &QueryParams::add(const String &name, double value, int decimalPlaces) {
+  return add(new FluxDouble(name, value, decimalPlaces));
+}
+
+QueryParams &QueryParams::add(const String &name, char value) {
+  String s(value);
+  return add(name, s);
+}
+
+QueryParams &QueryParams::add(const String &name, unsigned char value) {
+  return add(name, (unsigned long)value);
+}
+
+QueryParams &QueryParams::add(const String &name, int value) {
+  return add(name,(long)value);
+}
+
+QueryParams &QueryParams::add(const String &name, unsigned int value) {
+  return add(name,(unsigned long)value);
+}
+
+QueryParams &QueryParams::add(const String &name, long value) {
+    return add(new FluxLong(name, value));
+}
+
+QueryParams &QueryParams::add(const String &name, unsigned long value) {
+  return add(new FluxUnsignedLong(name, value));
+}
+
+QueryParams &QueryParams::add(const String &name, bool value) {
+  return add(new FluxBool(name, value));
+}
+
+QueryParams &QueryParams::add(const String &name, const String &value) {
+  return add(name, value.c_str());
+}
+
+QueryParams &QueryParams::add(const String &name, const __FlashStringHelper *pstr) {
+  return add(name, String(pstr));
+}
+
+QueryParams &QueryParams::add(const String &name, long long value)  {
+  return add(name,(long)value);
+}
+
+QueryParams &QueryParams::add(const String &name, unsigned long long value) {
+  return add(name,(unsigned long)value);
+}
+
+QueryParams &QueryParams::add(const String &name, const char *value) {
+  return add(new FluxString(name, value, FluxDatatypeString));
+}
+
+QueryParams &QueryParams::add(const String &name, struct tm tm, unsigned long micros ) {
+  return add(new FluxDateTime(name, FluxDatatypeDatetimeRFC3339Nano, tm, micros));
+}
+
+QueryParams &QueryParams::add(FluxBase *value) {
+ if(_data) {
+    _data->push_back(value);
+  }
+  return *this;
+}
+
+void QueryParams::remove(const String &name) {
+  if(_data) {
+    auto it = std::find_if(_data->begin(),_data->end(), [name](FluxBase *f){ return f->getRawValue() == name; } );
+    if(it != _data->end()) {
+      delete *it;
+      _data->erase(it);
+    }
+  }
+}
+// Copy constructor
+int QueryParams::size() {
+  if(_data) {
+    return _data->size();
+  }
+  return 0;
+}
+
+FluxBase *QueryParams::get(int i) {
+  if(_data) {
+    return _data->at(i);
+  }
+  return 0;
+}
+
+char *QueryParams::jsonString(int i) {
+  if(_data) {
+    return _data->at(i)->jsonString();
+  }
+  return nullptr;
+}

firmware/libraries/ESP8266_Influxdb/src/query/Params.h

@@ -0,0 +1,95 @@
+/**
+ * 
+ * Prams.h: InfluxDB flux query param
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2020 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#ifndef _QUERY_PARAM_H_
+#define _QUERY_PARAM_H_
+
+#include "FluxTypes.h"
+#include <memory>
+#include <vector>
+
+typedef std::vector<FluxBase *> ParamsList;
+/**
+ * QueryParams holds parameters for Flux query.
+ * Parameters are accessed via the 'params.' prefix: e.g. params.start
+ *
+ */ 
+class QueryParams {
+  public:
+    // Constructor
+    QueryParams();
+    // Copy constructor
+    QueryParams(const QueryParams& other);
+    // Assignment operator
+    QueryParams &operator=(const QueryParams &other);
+    // Descructor
+    ~QueryParams();
+    // Adds param with a float value. A number of decimal places can be optionally set.
+    QueryParams &add(const String &name, float value, int decimalPlaces = 2);
+    // Adds param with a double value. A number of decimal places can be optionally set.
+    QueryParams &add(const String &name, double value, int decimalPlaces = 2); 
+    // Adds param with a character value.
+    QueryParams &add(const String &name, char value);
+    // Adds param with an unsigned character value. It is added as a number.
+    QueryParams &add(const String &name, unsigned char value);
+    // Adds param with an integer value.
+    QueryParams &add(const String &name, int value);
+    // Adds param with an unsigned integer value.
+    QueryParams &add(const String &name, unsigned int value);
+    // Adds param with a long value.
+    QueryParams &add(const String &name, long value);
+    // Adds param with an unsigned long value.
+    QueryParams &add(const String &name, unsigned long value);
+    // Adds param with a boolen value.
+    QueryParams &add(const String &name, bool value);
+    // Adds param with a String value.
+    QueryParams &add(const String &name, const String &value);
+    // Adds param with a progmem string value.
+    QueryParams &add(const String &name, const __FlashStringHelper *pstr);
+    // Adds param with a long long value. It is converted to long.
+    QueryParams &add(const String &name, long long value);
+    // Adds param with an unsigned long long value. It is converted to long.
+    QueryParams &add(const String &name, unsigned long long value);
+    // Adds param with a string value.
+    QueryParams &add(const String &name, const char *value);
+    // Adds param as a string representation of date-time value in UTC timezone, e.g. "2022-01-12T23:12:30.124Z"
+    // Micros is fractional part of seconds up to microseconds precision. E.g. if millisecond are provided
+    // it must be converted to microseconds: micros = 1000*millis
+    QueryParams &add(const String &name, struct tm tm, unsigned long micros = 0);
+    // Removed a param
+    void remove(const String &name);
+    // Returns i-th param
+    FluxBase *get(int i);
+    // Returns params count
+    int size();
+    // Returns JSON representation of i-th param
+    char *jsonString(int i);
+  private:
+    QueryParams &add(FluxBase *value);
+    std::shared_ptr<ParamsList> _data;
+};
+
+#endif //_QUERY_PARAM_H_

firmware/libraries/ESP8266_Influxdb/src/util/debug.h

@@ -0,0 +1,41 @@
+/**
+ * 
+ * debug.h: InfluxDB Client debug macros
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2020 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#ifndef _INFLUXDB_CLIENT_DEBUG_H
+#define _INFLUXDB_CLIENT_DEBUG_H
+
+#include <Arduino.h>
+
+// Uncomment bellow in case of a problem and rebuild sketch
+//#define INFLUXDB_CLIENT_DEBUG_ENABLE
+
+#ifdef INFLUXDB_CLIENT_DEBUG_ENABLE
+# define INFLUXDB_CLIENT_DEBUG(fmt, ...) Serial.printf("%.03f ",millis()/1000.0f);Serial.printf_P( (PGM_P)PSTR(fmt), ## __VA_ARGS__ )
+#else
+# define INFLUXDB_CLIENT_DEBUG(fmt, ...)
+#endif //INFLUXDB_CLIENT_DEBUG
+
+#endif //# _INFLUXDB_CLIENT_DEBUG_H

firmware/libraries/ESP8266_Influxdb/src/util/helpers.cpp

@@ -0,0 +1,188 @@
+/**
+ *
+ * helpers.cpp: InfluxDB Client util functions
+ *
+ * MIT License
+ *
+ * Copyright (c) 2020 InfluxData
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#include "helpers.h"
+
+void timeSync(const char *tzInfo, const char* ntpServer1, const char* ntpServer2, const char* ntpServer3) {
+  // Accurate time is necessary for certificate validion
+
+  configTzTime(tzInfo,ntpServer1, ntpServer2, ntpServer3);
+
+  // Wait till time is synced
+  Serial.print("Syncing time");
+  int i = 0;
+  while (time(nullptr) < 1000000000l && i < 40) {
+    Serial.print(".");
+    delay(500);
+    i++;
+  }
+  Serial.println();
+
+  // Show time
+  time_t tnow = time(nullptr);
+  Serial.print("Synchronized time: ");
+  Serial.println(ctime(&tnow));
+}
+
+unsigned long long getTimeStamp(struct timeval *tv, int secFracDigits) {
+    unsigned long long tsVal = 0;
+    switch(secFracDigits) {
+        case 0:
+            tsVal = tv->tv_sec;
+            break;
+        case 6:
+            tsVal = tv->tv_sec * 1000000LL + tv->tv_usec;
+            break;
+        case 9:
+            tsVal = tv->tv_sec * 1000000000LL + tv->tv_usec * 1000LL;
+            break;
+        case 3:
+        default:
+            tsVal = tv->tv_sec * 1000LL + tv->tv_usec / 1000LL;
+            break;
+
+    }
+    return tsVal;
+}
+
+char *timeStampToString(unsigned long long timestamp, int extraCharsSpace) {
+    //22 is max long long string length (18)
+    char *buff = new char[22+extraCharsSpace+1];
+    snprintf(buff, 22, "%llu", timestamp);
+    return buff;
+}
+
+static char escapeChars[] = "=\r\n\t ,";
+
+char *escapeKey(const String &key, bool escapeEqual) {
+    char c,*ret,*d,*s = (char *)key.c_str();
+    int n = 0;
+    while ((c = *s++)) {
+        if(strchr(escapeEqual?escapeChars:escapeChars+1, c)) {
+            n++;
+        }
+    }
+    ret = new char[key.length()+n+1];
+    s = (char *)key.c_str();
+    d = ret;
+    while ((c = *s++)) {
+       if (strchr(escapeEqual?escapeChars:escapeChars+1,c)) {
+           *d++ = '\\';
+      }
+      *d++ = c;
+   }
+   *d = 0;
+   return ret;
+}
+
+String escapeValue(const char *value) {
+    String ret;
+    int len = strlen_P(value);
+    ret.reserve(len+7); //5 is estimate of max chars needs to escape,
+    ret += '"';
+    for(int i=0;i<len;i++)
+    {
+        switch (value[i])
+        {
+            case '\\':
+            case '\"':
+                ret += '\\';
+                break;
+        }
+
+        ret += value[i];
+    }
+    ret += '"';
+    return ret;
+}
+
+
+static char invalidChars[] = "$&+,/:;=?@ <>#%{}|\\^~[]`";
+
+static char hex_digit(char c) {
+    return "0123456789ABCDEF"[c & 0x0F];
+}
+
+String urlEncode(const char* src) {
+    int n=0;
+    char c,*s = (char *)src;
+    while ((c = *s++)) {
+        if(strchr(invalidChars, c)) {
+            n++;
+        }
+    }
+    String ret;
+    ret.reserve(strlen(src)+2*n+1);
+    s = (char *)src;
+    while ((c = *s++)) {
+       if (strchr(invalidChars,c)) {
+           ret += '%';
+           ret += hex_digit(c >> 4);
+           ret += hex_digit(c);
+      }
+      else ret += c;
+   }
+   return ret;
+}
+
+bool isValidID(const char *idString) {
+   if(strlen(idString) != 16) {
+     return false;
+   }
+   for(int i=0;i<16;i++) {
+     //0-9,a-f
+     if(!((idString[i] >= '0' && idString[i] <= '9') || (idString[i] >= 'a' && idString[i] <= 'f'))) {
+         return false;
+     }
+   }
+   return true;
+}
+
+const char *bool2string(bool val) {
+    return (val?"true":"false");
+}
+
+uint8_t getNumLength(long long l) {
+    uint8_t c = 0;
+    do {
+        c++;
+        l /=10;
+    } while(l);
+    return c;
+}
+
+char *cloneStr(const char *str) {
+  char *ret = new char[strlen(str)+1];
+  strcpy(ret, str);
+  return ret;
+}
+
+size_t strLen(const char *str) {
+    if(!str) {
+        return 0;
+    }
+    return strlen(str);
+}

firmware/libraries/ESP8266_Influxdb/src/util/helpers.h

@@ -0,0 +1,63 @@
+/**
+ * 
+ * helpers.h: InfluxDB Client util functions
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2020 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#ifndef _INFLUXDB_CLIENT_HELPERS_H
+#define _INFLUXDB_CLIENT_HELPERS_H
+
+#include <Arduino.h>
+#include <sys/time.h>  
+
+// Synchronize time with NTP servers and waits for completition. Prints waiting progress and final synchronized time to the serial.
+// Accurate time is necessary for certificate validion and writing points in batch
+// For the fastest time sync find NTP servers in your area: https://www.pool.ntp.org/zone/
+void timeSync(const char *tzInfo, const char* ntpServer1, const char* ntpServer2 = nullptr, const char* ntpServer3 = nullptr);
+
+// Create timestamp in offset from epoch. secFracDigits specify resulution. 0 - seconds, 3 - milliseconds, etc. Maximum and default is 9 - nanoseconds.
+unsigned long long getTimeStamp(struct timeval *tv, int secFracDigits = 3);
+
+// Converts unsigned long long timestamp to String
+char *timeStampToString(unsigned long long timestamp, int extraCharsSpace = 0);
+
+// Escape invalid chars in measurement, tag key, tag value and field key
+char *escapeKey(const String &key, bool escapeEqual = true);
+
+// Escape invalid chars in field value
+String escapeValue(const char *value);
+// Encode URL string for invalid chars
+String urlEncode(const char* src);
+// Returns true of string contains valid InfluxDB ID type
+bool isValidID(const char *idString);
+// Returns "true" if val is true, otherwise "false"
+const char *bool2string(bool val);
+// Returns number of digits
+uint8_t getNumLength(long long l);
+// Like strdup, but uses new
+char *cloneStr(const char *str);
+// Like strlen, but accepts nullptr
+size_t strLen(const char *str);
+
+
+#endif //_INFLUXDB_CLIENT_HELPERS_H

firmware/libraries/ESP8266_Influxdb/test/E2ETest.cpp

@@ -0,0 +1,101 @@
+#include "E2ETest.h"
+
+void E2ETest::run() {
+    failures = 0;
+    Serial.println("E2E Tests");
+    testBuckets();   
+    testWriteAndQuery(); 
+    Serial.printf("E2E Tests %s\n", failures ? "FAILED" : "SUCCEEDED");
+}
+
+void E2ETest::testBuckets() {
+    TEST_INIT("testBuckets");
+    InfluxDBClient client(E2ETest::e2eApiUrl, E2ETest::orgName, E2ETest::bucketName, E2ETest::token);
+    BucketsClient buckets = client.getBucketsClient();
+    TEST_ASSERT(!buckets.isNull());
+    TEST_ASSERTM(client.validateConnection(),client.getLastErrorMessage());
+    String id = buckets.getOrgID("my-org");
+    TEST_ASSERTM( isValidID(id.c_str()), id.length()?id:buckets.getLastErrorMessage());
+    id = buckets.getOrgID("org");
+    TEST_ASSERT( id == "");
+    TEST_ASSERT(buckets.checkBucketExists("my-bucket"));
+
+    TEST_ASSERT(!buckets.checkBucketExists("bucket-1"));
+    Bucket b = buckets.createBucket("bucket-1");
+    TEST_ASSERTM(!b.isNull(), buckets.getLastErrorMessage());
+    TEST_ASSERTM(isValidID(b.getID()), b.getID());
+    TEST_ASSERTM(!strcmp(b.getName(), "bucket-1"), b.getName());
+    TEST_ASSERTM(b.getExpire() == 0, String(b.getExpire()));
+    TEST_ASSERT(buckets.checkBucketExists("bucket-1"));
+    TEST_ASSERT(buckets.deleteBucket(b.getID()));;
+    TEST_ASSERT(!buckets.checkBucketExists("bucket-1"));
+    TEST_ASSERT(!buckets.deleteBucket("bucket-1"));
+
+    uint32_t monthSec = 3600*24*30;
+    b = buckets.createBucket("bucket-2", monthSec);
+    TEST_ASSERTM(!b.isNull(), buckets.getLastErrorMessage());
+    TEST_ASSERT(buckets.checkBucketExists("bucket-2"));
+    TEST_ASSERTM(b.getExpire() == monthSec, String(b.getExpire()));
+
+    uint32_t yearSec = 12*monthSec;
+    Bucket b2 = buckets.createBucket("bucket-3", yearSec);
+    TEST_ASSERTM(!b2.isNull(), buckets.getLastErrorMessage());
+    TEST_ASSERT(buckets.checkBucketExists("bucket-3"));
+    TEST_ASSERTM(b2.getExpire() == yearSec, String(b2.getExpire()));
+
+    TEST_ASSERT(buckets.checkBucketExists("bucket-2"));
+    TEST_ASSERT(buckets.deleteBucket(b.getID()));
+    TEST_ASSERT(buckets.checkBucketExists("bucket-3"));
+    TEST_ASSERT(buckets.deleteBucket(b2.getID()));;
+    TEST_ASSERT(!buckets.checkBucketExists("bucket-3"));
+    TEST_ASSERT(!buckets.checkBucketExists("bucket-2"));
+
+    TEST_END();
+}
+
+const char *QueryTemplate PROGMEM = "from(bucket: \"%s\") |> range(start: %ld) |> pivot(rowKey:[\"_time\"],columnKey: [\"_field\"],valueColumn: \"_value\") |> count(column: \"index\")";
+
+void E2ETest::testWriteAndQuery() {
+    TEST_INIT("testWriteAndQuery");
+    const char *TestBucket = "test-bucket";
+    InfluxDBClient client(E2ETest::e2eApiUrl, E2ETest::orgName, TestBucket, E2ETest::token);
+    
+
+    TEST_ASSERTM(client.validateConnection(),client.getLastErrorMessage());
+    time_t start = time(nullptr);
+    BucketsClient buckets = client.getBucketsClient();
+    TEST_ASSERT(!buckets.isNull());
+    Bucket t = buckets.findBucket(TestBucket);
+    if(!t.isNull()) {
+        Serial.println(F("Bucket already exists, deleting."));
+        TEST_ASSERTM(buckets.deleteBucket(t.getID()), buckets.getLastErrorMessage());
+    }
+    TEST_ASSERT(!buckets.checkBucketExists(TestBucket));
+    Bucket b = buckets.createBucket(TestBucket);
+    TEST_ASSERTM(!b.isNull(), buckets.getLastErrorMessage());
+
+    delay(1000);
+    for (int i = 0; i < 5; i++) {
+        Point *p = createPoint("test1");
+        p->addField("index", i);
+        TEST_ASSERTM(client.writePoint(*p),client.getLastErrorMessage());
+        delete p;
+    }   
+    
+    char *query = new char[strlen_P(QueryTemplate)+strlen(TestBucket)+10+1]; //10 - maximum=length of timestamo
+    sprintf_P(query, QueryTemplate, TestBucket, start);
+    FluxQueryResult result = client.query(query);
+    delete [] query;
+    TEST_ASSERTM(result.next(), result.getError());
+    FluxValue val = result.getValueByName("index");
+    TEST_ASSERT(!val.isNull());
+    TEST_ASSERTM(val.getLong() == 5, String(val.getLong()));
+    TEST_ASSERTM(!result.next(), result.getError());
+    
+    result.close();
+
+    TEST_ASSERT(buckets.deleteBucket(b.getID()));
+
+
+    TEST_END();
+}

firmware/libraries/ESP8266_Influxdb/test/E2ETest.h

@@ -0,0 +1,39 @@
+/**
+ * 
+ * E2ETest.h: E2R tests for InfluxDB client for Arduino
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2021 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#ifndef _E2E_TEST_H_
+#define _E2E_TEST_H_
+#include "TestBase.h"
+
+class E2ETest : public TestBase {
+public:
+    static void run();
+private: // tests
+    static void testBuckets();
+    static void testWriteAndQuery();
+};
+
+#endif //_E2E_TEST_H_

firmware/libraries/ESP8266_Influxdb/test/Test.h

@@ -0,0 +1,84 @@
+/**
+ * 
+ * Test.h: Unit and integration tests for InfluxDB client for Arduino
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2020 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#ifndef _TEST_H_
+#define _TEST_H_
+
+#include <Arduino.h>
+
+#include "TestBase.h"
+
+class Test : public  TestBase {
+public:
+    static void run();
+private: //helpers
+    static void setServerUrl(InfluxDBClient &client, String serverUrl);
+private: // tests
+    static void testUtils();
+    static void testOptions();
+    static void testEcaping();
+    static void testPoint();
+    static void testBatch();
+    static void testLineProtocol();
+    static void testFluxTypes();
+    static void testFluxTypesSerialization();
+    static void testFluxParserEmpty();
+    static void testFluxParserSingleTable();
+    static void testFluxParserNilValue();
+    static void testFluxParserMultiTables(bool chunked);
+    static void testFluxParserErrorDiffentColumnsNum();
+    static void testFluxParserFluxError();
+    static void testFluxParserInvalidDatatype();
+    static void testFluxParserMissingDatatype();
+    static void testFluxParserErrorInRow();
+    static void testBasicFunction();
+    static void testInit();
+    static void testV1();
+    static void testUserAgent();
+    static void testFailedWrites();
+    static void testTimestamp();
+    static void testTimestampAdjustment();
+    static void testHTTPReadTimeout();
+    static void testRetryOnFailedConnection();
+    static void testRetryOnFailedConnectionWithFlush();
+    static void testBufferOverwriteBatchsize1();
+    static void testBufferOverwriteBatchsize5();
+    static void testServerTempDownBatchsize5();
+    static void testRetriesOnServerOverload();
+    static void testRetryInterval();
+    static void testDefaultTags();
+    static void testUrlEncode();
+    static void testRepeatedInit();
+    static void testIsValidID();
+    static void testBuckets();
+    static void testQueryParams();
+    static void testFlushing();
+    static void testNonRetry();
+    static void testLargeBatch();
+    static void testQueryWithParams();
+};
+
+#endif //_TEST_H_

firmware/libraries/ESP8266_Influxdb/test/TestBase.cpp

@@ -0,0 +1,57 @@
+#include "TestBase.h"
+
+#if defined(ESP32)
+#include <WiFi.h>
+String chipId = String((unsigned long)ESP.getEfuseMac());
+String deviceName = "ESP32";
+#elif defined(ESP8266)
+#include <ESP8266WiFi.h>
+String chipId = String(ESP.getChipId());
+String deviceName = "ESP8266";
+#endif
+
+const char * TestBase::managementUrl;
+const char * TestBase::apiUrl;
+const char * TestBase::e2eApiUrl;
+const char * TestBase::orgName;
+const char * TestBase::bucketName;
+const char * TestBase::dbName;
+const char * TestBase::token;
+
+int TestBase::failures = 0;
+
+void TestBase::setup(const char * mgmtUrl, const char * apiUrl, const char *e2eApiUrl, const char * orgName, const char * bucketName, const char * dbName, const char * token) {
+    TestBase::managementUrl = mgmtUrl;
+    TestBase::apiUrl = apiUrl;
+    TestBase::e2eApiUrl = e2eApiUrl;
+    TestBase::orgName = orgName;
+    TestBase::bucketName = bucketName;
+    TestBase::dbName = dbName;
+    TestBase::token = token;
+}
+
+Point *TestBase::createPoint(const String &measurement) {
+    Point *point = new Point(measurement);
+    point->addTag("SSID", WiFi.SSID());
+    point->addTag("device_name", deviceName);
+    point->addTag("device_id", chipId);
+    point->addField("temperature", random(-20, 40) * 1.1f);
+    point->addField("humidity", random(10, 90));
+    point->addField("code", random(10, 90));
+    point->addField("door", random(0, 10) > 5);
+    point->addField("status", random(0, 10) > 5 ? "ok" : "failed");
+    return point;
+}
+
+bool testAssertm(int line, bool state, const String &message) {
+  if(!state) {
+    ++TestBase::failures;
+    Serial.printf("Assert failure line %d%s%s\n", line, message.length()>0?": ":"",message.c_str());
+    return true;
+  }
+  return false;
+}
+
+bool testAssert(int line, bool state) {
+  return testAssertm(line, state, "");
+}

firmware/libraries/ESP8266_Influxdb/test/TestBase.h

@@ -0,0 +1,62 @@
+/**
+ * 
+ * AbstractTest.h: Test base for tests for InfluxDB client for Arduino
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2021 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+#ifndef _ABSTRACT_TEST_H_
+#define _ABSTRACT_TEST_H_
+
+#include <InfluxDbClient.h>
+#include <InfluxDbCloud.h>
+#include "TestSupport.h"
+
+#define TEST_INIT(name)  int temp = failures;\
+ const char *testName = name; \
+ serverLog(TestBase::managementUrl, name); \
+  do { \
+  Serial.println(testName)
+#define TEST_END()  } while(0); \
+ end: Serial.printf("%s %s\n",testName,failures == temp?"SUCCEEDED":"FAILED")
+#define TEST_ASSERT(a) if(testAssert(__LINE__, (a))) goto end
+#define TEST_ASSERTM(a,m) if(testAssertm(__LINE__, (a),(m))) goto end
+
+class TestBase {
+public:
+    static const char * managementUrl;
+    static const char * apiUrl;
+    static const char * e2eApiUrl;
+    static const char * orgName;
+    static const char * bucketName;
+    static const char * dbName;
+    static const char * token;
+    static int failures;
+public:
+    static void setup(const char * mgmtUrl, const char * apiUrl, const char *e2eApiUrl, const char * orgName, const char * bucketName, const char * dbName, const char * token);
+    static Point *createPoint(const String &measurement);
+};
+
+bool testAssertm(int line, bool state,const String &message);
+bool testAssert(int line, bool state);
+
+#endif //_E2E_TEST_H_

firmware/libraries/ESP8266_Influxdb/test/TestSupport.cpp

@@ -0,0 +1,156 @@
+/**
+ * 
+ * TestSupport.cpp: Supporting functions for tests
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2020 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+
+#include <Arduino.h>
+#if defined(ESP8266)
+# include <ESP8266HTTPClient.h>
+#elif defined(ESP32)
+# include <HTTPClient.h>
+#endif
+
+#include "TestSupport.h"
+
+static HTTPClient httpClient;
+
+void printFreeHeap() {
+  Serial.print("[TD] Free heap: ");  
+  Serial.println(ESP.getFreeHeap());
+}
+
+int httpPOST(const String &url, String mess) {
+  httpClient.setReuse(false);
+  int code = 0;
+  WiFiClient client;
+  if(httpClient.begin(client, url)) {
+    code = httpClient.POST(mess);
+    httpClient.end();
+  }
+  return code;
+}
+
+int httpGET(const String &url) {
+  httpClient.setReuse(false);
+  int code = 0;
+  WiFiClient client;
+  if(httpClient.begin(client, url)) {
+    code = httpClient.GET();
+    if(code != 204) {
+       //Serial.print("[TD] ");
+       //String res = http.getString();
+       //Serial.println(res);
+    }
+    httpClient.end();
+  }
+  return code;
+}
+
+bool deleteAll(const String &url) {
+  return httpPOST(url + "/api/v2/delete","") == 204;
+}
+
+bool serverLog(const String &url, String mess) {
+  return httpPOST(url + "/log", mess) == 204;
+}
+
+bool isServerUp(const String &url) {
+    return httpGET(url + "/status") == 200;
+}
+
+
+int countParts(const String &str, char separator) {
+  int lines = 0;
+  int i,from = 0;
+  while((i = str.indexOf(separator, from)) >= 0) {
+    ++lines;
+    from = i+1;
+  }
+  // try last part
+  if(from < str.length() && str.substring(from).length()>0) {
+    ++lines;
+  }
+  return lines;
+}
+
+String *getParts(const String &str, char separator, int &count) {
+  count = countParts(str, separator);
+  String *ret = new String[count];
+  int i,from = 0,p=0;
+  while((i = str.indexOf(separator, from)) >= 0) {
+    ret[p++] = str.substring(from,i);
+    from = i+1;
+  }
+  // try last part
+  if(from < str.length() && str.substring(from).length()>0) {
+    ret[p] = str.substring(from);
+  }
+  return ret;
+}
+
+int countLines(FluxQueryResult flux) {
+  int lines = 0;
+  while(flux.next()) {
+    lines++;
+  }
+  flux.close();
+  return lines;
+}
+
+std::vector<String> getLines(FluxQueryResult flux) {
+  std::vector<String> lines;
+  while(flux.next()) {
+    String line;
+    int i=0;
+    for(auto &val: flux.getValues()) {
+      if(i>0) line += ",";
+      line += val.getRawValue();
+      i++;
+    }
+    lines.push_back(line);
+  }
+  flux.close();
+  return lines;
+}
+
+
+bool compareTm(tm &tm1, tm &tm2) {
+    time_t t1 = mktime(&tm1);
+    time_t t2 = mktime(&tm2);
+    return difftime(t1, t2) == 0;
+} 
+
+bool waitServer(const String &url, bool state) {
+    int i = 0;
+    while(isServerUp(url) != state && i<10 ) {
+        if(!i) {
+            Serial.println(state?"[TD] Starting server":"[TD] Shuting down server");
+            httpGET(url + (state?"/start":"/stop"));
+        }
+        delay(500);
+        i++;
+    }
+    return isServerUp(url) == state;
+}

firmware/libraries/ESP8266_Influxdb/test/TestSupport.h

@@ -0,0 +1,59 @@
+/**
+ * 
+ * TestSupport.h: Supporting functions for tests
+ * 
+ * MIT License
+ * 
+ * Copyright (c) 2020 InfluxData
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+
+#ifndef _TEST_SUPPORT_H_
+#define _TEST_SUPPORT_H_
+
+#include "query/FluxParser.h"
+
+void printFreeHeap();
+
+int httpPOST(const String &url, String mess);
+
+int httpGET(const String &url);
+
+bool deleteAll(const String &url) ;
+
+bool serverLog(const String &url, String mess);
+
+bool isServerUp(const String &url);
+
+
+int countParts(const String &str, char separator);
+
+String *getParts(const String &str, char separator, int &count);
+
+int countLines(FluxQueryResult flux) ;
+
+std::vector<String> getLines(FluxQueryResult flux);
+
+
+bool compareTm(tm &tm1, tm &tm2);
+// Waits for server in desired state (up - true, down - false)
+bool waitServer(const String &url, bool state);
+
+#endif //_TEST_SUPPORT_H_

firmware/libraries/ESP8266_Influxdb/test/customSettings.h

@@ -0,0 +1,6 @@
+#ifndef _CUSTOM_SETTING_H_
+#define _CUSTOM_SETTING_H_
+
+
+
+#endif //_CUSTOM_SETTING_H_

firmware/libraries/ESP8266_Influxdb/test/server/Readme.md

@@ -0,0 +1,16 @@
+# InfluxDB 2 mock server
+
+Mock server which simulates InfluxDB 1 and 2 write and query API.
+
+First time, run: `yarn install` to download dependencies.
+
+Run server: `yarn start`:
+
+In query, it returns all written points, unless deleted. The results set had simple cvs form: measurement,tags, fields.
+
+1st point in a batch if it has tag with name `direction` controls advanced behavior with value: 
+ - `429-1` - reply with 429 status code and add Reply-After header with value 30
+ - `429-2` - reply with 429 status
+ - `503-1` - reply with 503 status code and add Reply-After header with value 10
+ - `503-2` - reply with 503 status
+ - `delete-all` - deletes all written points