148 lines
4.7 KiB
C++
148 lines
4.7 KiB
C++
/**
|
|
* 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);
|
|
}
|
|
|