Set a timeout/interupt on a process?

Projects Programming
1

When using GitHub - arduino-libraries/ArduinoMqttClient: ArduinoMqttClient Library for Arduino Arduino MQTT Client on my MKR NB1500, I find it frequently stuck on .poll() . I am wondering if there is a way I could write my code in a way that while .poll() is running, there is a timer on the side and if it times out kills the process or just reset the Arduino?

2

I found that the mqtt.loop() getting whacked out can be a function of the network connection. I've not used client.poll().

3

Yes, I am suspecting there maybe an network issue. I already check if GPRS is attached before running the .poll(). However, it still freeze sometimes.

4

This is how I connect to WiFi and the MQTT Broker,

void MQTTkeepalive( void *pvParameters )
{
  sema_MQTT_KeepAlive   = xSemaphoreCreateBinary();
  xSemaphoreGive( sema_MQTT_KeepAlive ); // found keep alive can mess with a publish, stop keep alive during publish
  // setting must be set before a mqtt connection is made
  MQTTclient.setKeepAlive( 90 ); // setting keep alive to 90 seconds makes for a very reliable connection, must be set before the 1st connection is made.
  for (;;)
  {
    //check for a is-connected and if the WiFi 'thinks' its connected, found checking on both is more realible than just a single check
    if ( (wifiClient.connected()) && (WiFi.status() == WL_CONNECTED) )
    {
      xSemaphoreTake( sema_MQTT_KeepAlive, portMAX_DELAY ); // whiles MQTTlient.loop() is running no other mqtt operations should be in process
      MQTTclient.loop();
      xSemaphoreGive( sema_MQTT_KeepAlive );
    }
    else {
      log_i( "MQTT keep alive found MQTT status %s WiFi status %s", String(wifiClient.connected()), String(WiFi.status()) );
      if ( !(wifiClient.connected()) || !(WiFi.status() == WL_CONNECTED) )
      {
        connectToWiFi();
      }
      connectToMQTT();
    }
    vTaskDelay( 250 ); //task runs approx every 250 mS
  }
  vTaskDelete ( NULL );
}

Using WiFi? Issue a disconnect before connecting so that the WiFi stack gets set to default values before a connection is made.

5

Which MQTT library are you using. There are many different one out there.

6

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