Making your e-paper device accessible with MQTT

Integrating MQTT into our existing code is easy. We already have all the pieces ready:

• Code to display a text on the e-paper module (our main sketch)
• An example to send text via MQTT

We now need to combine these two so the text we receive via MQTT on the Arduino is used to set the text on the display. Because we have a good abstraction of our code with the setText function, we only have to add one more line of code after integrating the code from the example.

The MQTT example consists of the following parts:

• Pre-compiler definitions and variable declarations (at the top of the sketch).
• void setup(): Called once at the beginning, this initializes the serial port and calls the Wi-Fi/MQTT connect function.
• void loop(): The function that is executed repeatedly after the setup function has finished.
• void connect(): Establishes...