MQTT driver for ESP32 target

MQTT blockset for Waijung 2 (ESP32 target) contains three blocks for connecting, subscribing and publishing with MQTT broker.

MQTT blockset for Waijung 2 contains three blocks for connecting, subscribing and publishing with MQTT brokers. To use this blockset, user must first download and install Waijung 2 (https://www.aimagin.com/en/waijung-2-for-esp32.html) as Embedded Coder for ESP32 target. This blockset wraps the C API of ESP-MQTT libray using MATLAB System Object.

The preparation steps are as follows:

1. extract 7z file using 7zip application, avoid to use path with space and special characters.

2. run MATLAB and change working folder to Waijung 2.

3. run install_waijung2.m to install and set path.

4. create a Simulink model, then add Waijung 2 Target Setup block.

5. configure board (flash memory size and COM port)

6. select Embedded Coder app to show C CODE tab.

7. click Build to build application.

To use this blockset, the model should follow the following guideline.

1. Use WiFi Setup block from Waijung 2 blockset to connect with available a WiFi network.

2. Use the output port of WiFi Setup block to trigger the <MQTT connect> block.

3. Put <MQTT subscribe> and <MQTT publish>blocks inside Enabled Subsystem block to be enabled by <MQTT connect> block.

At version 0.1x, only MQTT over TCP and WebSocket is supported. Future improvement is to support other secure connections.