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

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2022-09-15 10:23:02 +02:00
/**
* 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);
}