Test sonde mqtt esp8266

Un test pour générer des valeurs comprissent entre 0 et 100 sur un topic test/topic.

Récupérer la librairie pubsubclient sur Github et la décompresser dans le dossier librairies de L'ide Arduino.

#include <ESP8266WiFi.h>
#include <PubSubClient.h>

#define host_name "YOUR HOST NAME"
#define wifi_ssid "YOUR WIFI SSID"
#define wifi_password "WIFI PASSWORD"

#define mqtt_server "YOUR_MQTT_SERVER_HOST"
#define mqtt_user "your_username"
#define mqtt_password "your_password"

#define test_topic "test/topic"

WiFiClient espClient;
PubSubClient client(espClient);
long lastMsg = 0;

void setup() {
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
}

void setup_wifi() {
  delay(10);
  // We start by connecting to a WiFi network
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(wifi_ssid);

  WiFi.begin(wifi_ssid, wifi_password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Attempt to connect
    // If you do not want to use a username and password, change next line to
     if (client.connect(equipement_name)) {
    //if (client.connect(equipement_name, mqtt_user, mqtt_password)) {
      Serial.println("connected");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}



void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();

  long now = millis();
  
  if (now - lastMsg > 15000) {
    lastMsg = now;
    long capacite = random(100);

    Serial.print("capacite :");
    Serial.println(String(capacite).c_str());
    client.publish(test_topic, String(capacite).c_str(), true);
  }
}

Sources :

https://home-assistant.io/blog/2015/10/11/measure-temperature-with-esp8266-and-report-to-mqtt/