CODEWITHSUNDEEP
arduinodelaymqttpublish-subscribe
birgit
birgit

Reputation: 1129

MQTT client.publish() and delay()

I have a small local IoT network with a handful of Wemos D1 nodes programmed in the Arduino IDe. Some of them have two sensors connected, e.g. rain and humidity. I want to send out values every minute, one minute the rain, one minute the humidity. Below code generally works with delay(5000); for both, but once I have something like delay(60000); the node apparently starts only publishing the rain and skips the humidity (I have a mosquitto_sub -h myIP -v -t '#' running to listen for messaged.

This is my loop() where all the sensing and sending happens:

void loop() {
    if (!client.connected() && WiFi.status() == 3) {
        reconnect();
    }
    client.loop();

    int val = digitalRead(rainSensor);     // read the input pin
    rain_str = String(val);
    rain_str.toCharArray(rain, rain_str.length() + 1); 
    client.publish(rainTopic, rain);
    delay(60000);

    int val2 = analogRead(humidSensor);     // read the input pin
    humid_str = String(val2);
    humid_str.toCharArray(humid, humid_str.length() + 1);
    client.publish(humidTopic, humid);
    delay(60000);
}

Upvotes: 3

Views: 3532

Answers (1)

Mackalacka
Mackalacka

Reputation: 61

You will get a MQTT_CONNECTION_TIMEOUT if you are not calling the client.loop() function within MQTT_KEEPALIVE seconds (typically 15 s).

Make sure to call the client.loop() with much shorter interval. Use a counter to to count to 60 or better use a timer function like the Ticker library.

Upvotes: 4

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