Verifying the connection

If the code compiled and uploaded successfully there a serial monitor should have automatically opened and you should see live data from the controller like so:

If the serial monitor does not open automatically click the button below:

This means that the code was successfully uploaded and the board has connected to the MQTT server.

Install the MQTTBox chrome app to publish and subscribe messages to the MQTT server.

Configure the connection with your details and publish a message to the topic that your board is listening to (mytopic in the example)

The board should receive the message and print it out in the serial monitor: