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Connect to a MQTT broker Example

The purpose of this code is to connect the mqtt broker "test.mosquitto.org". To reach this goal, it first connects to Wi-Fi in the setup function. It then tries to connect the specified broker.

There are several ways to connect a broker using the connect() function in PubSubClient library. One of the simplelest ways is just using client id which demonstraits in the example code. The client_id string is used for this purpose. It can be any string you want, just note that it must be special so that the broker will recognizes it as a different connected device.

How to Use Example

Using Arduino IDE

  • Before Compile/Verify, select the correct board: Tools -> Board.
  • Select the COM port: Tools -> Port: xxx where the xxx is the detected COM port.

Using VScode

  • Make Sure that all configurations are correct and you have selected the correct file to upload.
  • Upload the code with the upload button on the top + right side of the IDE. Or simply press Ctrl + Alt + U.
  • The code starts to upload

Example/Log Output

Connecting to WiFi..
Connecting to WiFi..
Connecting to WiFi..
Connecting to WiFi..
Connecting to WiFi..
Connecting to WiFi..
Connected to the WiFi network
The client aut-esp32-client-ff:ee:ff:ee:ff:ee connects to the public mqtt broker
Public emqx mqtt broker connected

mqtt broker connected