MQTT Library

[jasin]

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:

[img]https://i.postimg.cc/YqgLcmNd/MQTT-Library.png[/img]

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

Code:

MQTTClient client;

MQTT client has to be initialized ie:

Code:

client.begin(“broker.shiftr.io”, net);

broker.shiftr.io 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

Code:

client.onMessage(messageReceived);

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:

Code:

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

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

Code:

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

Methods for Publish/Subscribe to broker are:

Code:

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

When Example sketch is used, the communication can be seen on web pages of Shiftr.io:

[img]https://i.postimg.cc/GpnQwCsy/shiftr-io-web.png[/img]

And on Controllino terminal:

[img]https://i.postimg.cc/CKwqsLqm/terminal.png[/img]

[mfathany-psi]

Can I request the Full Example Code MQTT ?

[ifi_raj]

Hello,

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: https://github.com/256dpi/arduino-mqtt

[jasin]

Hello

Here it is.

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

Code:

; 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
; https://docs.platformio.org/page/projectconf.html

[env:controllino_maxi]
platform = atmelavr
board = controllino_maxi
framework = arduino
lib_deps = controllino, ethernet, SPI, MQTT

Code:

Code:

#include
#include /* Usage of CONTROLLINO library allows you to use CONTROLLINO_xx aliases in your sketch. */
#include
#include /* by Joël Gähwiler. Have to be installed via Library Manager. See https://github.com/256dpi/arduino-mqtt */

/*
CONTROLLINO – Demonstration of MQTT protocol usage, Version 01

Based on example code by Joël Gähwiler. See https://github.com/256dpi/arduino-mqtt .

You can check on your device after a successful
connection here: https://shiftr.io/try .

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

(Refer to https://github.com/CONTROLLINO-PLC/CONTROLLINO_Library if you do not see the CONTROLLINOs in the Arduino IDE menu Tools->Board.)

Created 29 Jan 2019
by Jasin
https://controllino.biz/

Check https://github.com/CONTROLLINO-PLC/CONTROLLINO_Library for the latest CONTROLLINO related software stuff.
Visit our forum here: https://forum.controllino.biz/
*/

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("/controllino.biz"); // 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("broker.shiftr.io", 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(“/controllino.biz”, “Hello Controllino”);
}
}

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