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