This is a replacement for mt7697 module with esp8266 to make cloud-free humidifier.

The MQTT protocol has json format and works both ways to send data to humidifier and receive current status.

To humidifier topic esp8266/XXXXXX/set:

• state - controls power, can be ON or OFF
• preset_mode - controls preset mode, one of silent, medium, high, auto
• command - restart to restart esp8266 and reset to remove the configuration and restart

{
  "state": "ON",
  "preset_mode": "high"
}

From humidifier topic esp8266/XXXX:

{
  "state": "ON",
  "temperature": 24.3,
  "humidity": 48,
  "preset_mode": "silent",
  "depth": 21
}

fan:
  - platform: mqtt
    name: Humidifier
    state_topic: esp8266/XXXXXX
    state_value_template: "{{ value_json.state }}"
    json_attributes_topic: esp8266/XXXXXX
    availability_topic: esp8266/XXXXXX/availability
    command_topic: esp8267/XXXXXX/set
    command_template: "{ state: '{{ value }}'}"
    preset_mode_command_topic: esp8266/XXXXXX/set
    preset_mode_command_template: "{ preset_mode: '{{ value }}'}"
    preset_mode_value_template: "{{ value_json.preset_mode }}"
    preset_modes:
      - "auto"
      - "high"
      - "medium"
      - "silent"

• src/ - esp8266 firmware
• tools/get-tz.py - generate timezone list for esp8266 firmware
• protocol.txt - uart protocol between mt7697 and stm32