Activity Forums Tutorials MQTT Library

  • MQTT Library

     jasin updated 9 months, 1 week ago 3 Members · 4 Posts
  • jasin

    March 7, 2019 at 4:26 pm

    There is an MQTT library compatible with Controllino MAXI and MEGA (Must provide a network implementation).

    It can be installed via Library Manager in Arduino IDE see:


    After installing the library it is possible to use MQTTClient class:


    MQTTClient client;

    MQTT client has to be initialized ie:


    client.begin(“”, net); is a free service which provides a rich publish & subscribe communication infrastructure.

    net is initialized EthernetClient connection.

    Then it is possible to Register a handler for incoming messages



    messageReceived is a function, that will be called whenever a message is received from the topic. The function must have two string parameters topic and message ie:


    void messageReceived(String &topic, String &payload)
    Serial.println(“incoming: ” + topic + ” – ” + payload);

    Method for connecting the client with a username and password specified:


    client.connect(“Controllino”, “try”, “try”)

    Methods for Publish/Subscribe to broker are:


    client.publish(“/”, “Hello Controllino”);

    When Example sketch is used, the communication can be seen on web pages of


    And on Controllino terminal:


  • mfathany-psi

    April 23, 2019 at 6:43 am

    Can I request the Full Example Code MQTT ? :)

  • ifi_raj

    August 6, 2020 at 8:30 am


    I think the “MQTT” Lib from Joel Gaehwiler is used here. On the Github Site you can see some examples and information to the lib:

  • jasin

    August 10, 2020 at 11:23 am


    Here it is.

    It was tested as PlatformIO project with this config (.ini)


    ; PlatformIO Project Configuration File
    ; Build options: build flags, source filter
    ; Upload options: custom upload port, speed and extra flags
    ; Library options: dependencies, extra library storages
    ; Advanced options: extra scripting
    ; Please visit documentation for the other options and examples

    platform = atmelavr
    board = controllino_maxi
    framework = arduino
    lib_deps = controllino, ethernet, SPI, MQTT



    #include /* Usage of CONTROLLINO library allows you to use CONTROLLINO_xx aliases in your sketch. */
    #include /* by Joël Gähwiler. Have to be installed via Library Manager. See */

    CONTROLLINO – Demonstration of MQTT protocol usage, Version 01

    Based on example code by Joël Gähwiler. See .

    You can check on your device after a successful
    connection here: .

    Compatible with CONTROLLINO MAXI, MAXI Automation and MEGA.
    Please, select proper target board in Tools->Board->Controllino MAXI/MEGA before Upload to your CONTROLLINO.

    (Refer to if you do not see the CONTROLLINOs in the Arduino IDE menu Tools->Board.)

    Created 29 Jan 2019
    by Jasin

    Check for the latest CONTROLLINO related software stuff.
    Visit our forum here:

    byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
    byte ip[] = {192, 168, 16, 177}; // <- change to match your network EthernetClient net; MQTTClient client; unsigned long lastMillis = 0; void connect() { Serial.print("connecting..."); while (!client.connect("Controllino", "try", "try")) { Serial.print("."); delay(1000); } Serial.println("nconnected!"); client.subscribe("/"); // client.unsubscribe("/hello"); } void messageReceived(String &topic, String &payload) { Serial.println("incoming: " + topic + " - " + payload); } void setup() { Serial.begin(9600); Ethernet.begin(mac, ip); // Note: Local domain names (e.g. "Computer.local" on OSX) are not supported by Arduino. // You need to set the IP address directly. client.begin("", net); client.onMessage(messageReceived); connect(); } void loop() { client.loop(); if (!client.connected()) { connect(); } // publish a message roughly every second. if (millis() - lastMillis > 1000) {
    lastMillis = millis();
    client.publish(“/”, “Hello Controllino”);

    /* 2019-01-29: The sketch was successfully tested with Arduino 1.8.5, Controllino Library 3.0.4 and CONTROLLINO MAXI. */

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0 of 0 posts June 2018