Hi I am using the Google Cloud IoT core example. This requires the b

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Reconnect about arduinomqttclient HOT 3 CLOSED

arduino-libraries commented on September 14, 2024

Reconnect

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Comments (3)

aentinger commented on September 14, 2024

Hi @fabltd 👋
On the very basic level you could try something like this

void loop()
{
  /* ... */
  if (!mqttClient.connected()) {
    Serial.println("MQTT connection lost");
    if (!mqttClient.connect(broker, port)) {
      Serial.print("MQTT reconnection error ");
      Serial.println(mqttClient.connectError());
    }
  }
}

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jason-a-alexander commented on September 14, 2024

@aentinger This was very helpful. I had searched for a while before I found this. I built out this in my main loop to make sure that I'm always connected. It will block the main loop if it can't connect but in my case if I can't connect to the MQTT broker then the rest of my code is not useful anyway as the sensor data has no where to go.

if (currentMillis - previousMillis >= interval) {
    // save the last time a message was sent
    previousMillis = currentMillis;

    if (!mqttClient.connected()) {
      mySerial.println("MQTT Not Connected");
      while (!mqttClient.connect(broker, port)) {
        mySerial.print("MQTT connection failed! Error code = ");
        mySerial.println(mqttClient.connectError());
        delay (10000);
      }
      mySerial.println("You're connected to the MQTT broker!");
      mySerial.println();

      mqttClient.onMessage(onMqttMessage);

      mySerial.println("Getting Inital Subscriptions");
      mqttClient.subscribe(commandUpdate);
      mqttClient.subscribe(commandStartOffset);
      mqttClient.subscribe(commandHouseOffset);
      delay(1000);

    }

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aentinger commented on September 14, 2024

I'm glad to hear this was of help to you @jason-a-alexander 😉

I'm closing this issue, since the OP has disappeared.

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