WIP project, it's a firmware for ESP32 microcontrollers supporting UART communication via the CN105 Mitsubishi connector to control their HVAC unit using Wifi but without MQTT (like others projects), only using REST request and JSON.
It use SwiCago libraries: https://github.com/SwiCago/HeatPump
This component version is based on https://github.com/gysmo38/mitsubishi2MQTT

Description

You still can use the embedded webserver for configuration and communication, but can use json to send command, using the endpoint /json.

curl http://127.0.0.1:81/json -X POST -d '{"power": "on"}'

And the device send json to a server when a change happen

{
   "temperature":17,
   "fan":"QUIET",
   "vane":"4",
   "widevane":"|",
   "mode":"HEAT",
   "power":"OFF",
   "roomTemperature":17,
   "compressorFrequency":0,
   "action":false
}

Configuration

Take a look in the platformio.ini, you can found some informations, like other GPIO pin selected.