ZigBee2MQTT and Aqara DoorWindow Sensor

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1. Remove MQTT Command Topic.
2. Remove /contact from MQTT State Topic.
3. Check ‘Show advanced’.
4. Set ‘Incoming Value Transformations’ to JSONPATH:$.contact
5. Optional: Set Custom Off/On/Open/Closed Values to your needs (use false and true)

Further reading:

• Xiaomi MCCGQ11LM control via MQTT | Zigbee2MQTT
• Xiaomi MCCGQ12LM control via MQTT | Zigbee2MQTT
• Xiaomi MCCGQ13LM control via MQTT | Zigbee2MQTT
• Xiaomi MCCGQ14LM control via MQTT | Zigbee2MQTT
• https://community.openhab.org/t/use-case-integrating-ikea-starkvind-air-purifier-into-openhab/