Use MQTT and ESP8266/ESP32 module to control Mitsubishi HVAC unit. It use SwiCago librairies: https://github.com/SwiCago/HeatPump

Features:

• Initial config: WIFI AP mode and web portal
• Web interface for configuration, status and control, firmware upgrade
• Homeassistant autodiscovery and control with MQTT

Screenshots:

Main Page

Control page

Config page

How to use:

• Step 1: flash the sketch with flash size include SPIFFS option.
• Step 2: connect to device AP with name HVAC_XXXX (XXXX last 4 character MAC address)
• Step 3: You should be automatically redirected to the web portal or go to 192.168.1.1
• Step 4: set Wifi information, save & reboot. Fall back to AP mode if WiFi connection fails (AP password sets to default SSID name from step 2).
• Step 5: find the device IP with last 4 character MAC address in your router
• Step 6: (optional): Set MQTT information for use with Home Assistant
• Step 7: (optional): Set Login password to prevent unwanted access in SETUP->ADVANCE->Login Password

For nodered fans MQTT topic use cases

• topic/power/set OFF
• topic/mode/set AUTO HEAT COOL DRY FAN_ONLY OFF ON
• topic/temp/set 16-31
• topic/remote_temp/set also called "room_temp", the implementation defined in "HeatPump" seems not work in some models
• topic/fan/set 1-4 AUTO QUIET
• topic/vane/set 1-5 SWING AUTO
• topic/wideVane/set << < | > >>
• topic/settings
• topic/state
• topic/debug
• topic/debug/set on off
• topic/custom/send as example "fc 42 01 30 10 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 7b " see https://github.com/SwiCago/HeatPump/blob/master/src/HeatPump.h