Connecting with pubsubclient with MyQttHub -- Arduino Client for MQTT

anon79473925 · 2020-04-07 08:33:50 UTC

Introduction

PubSubClient is a client side MQTT library for Arduino that allows publishing limited to QoS 0, and subscribe up to QoS1, written in C++.

You have more information about its features and latest updates at: https://github.com/knolleary/pubsubclient

How to connect to MyQttHub using pubsubclient

You have working examples located here:

Because pubsubclient does not support TLS, to connect to MyQttHub you will have to use plain unprotected MQTT connection over standard port (1883/tcp) with clientId+userName+Password. For that, start using the following example with authentication support:

github.com

knolleary/pubsubclient/blob/master/examples/mqtt_auth/mqtt_auth.ino

/*
 Basic MQTT example with Authentication

  - connects to an MQTT server, providing username
    and password
  - publishes "hello world" to the topic "outTopic"
  - subscribes to the topic "inTopic"
*/

#include <SPI.h>
#include <Ethernet.h>
#include <PubSubClient.h>

// Update these with values suitable for your network.
byte mac[]    = {  0xDE, 0xED, 0xBA, 0xFE, 0xFE, 0xED };
IPAddress ip(172, 16, 0, 100);
IPAddress server(172, 16, 0, 2);

void callback(char* topic, byte* payload, unsigned int length) {
  // handle message arrived

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Configure the following details to make your connection work at the PubSubClient client declaration:

server: node02.myqtthub.com
port: 1883

Then, configure your client.connect pubsubclient API with:

“arduinoClient” : place here device clientId
“testuser” : place here device userName
“testpass” : place here device password