MQTT Sensor Support

This generic sensor implementation uses the MQTT message payload as the sensor value. If messages in this state_topic are published with RETAIN flag, the sensor will receive an instant update with last known value. Otherwise, the initial state will be undefined.

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# Example configuration.yml entry
sensor:
  platform: mqtt
  state_topic: "home/bedroom/temperature"
  name: "MQTT Sensor"
  qos: 0
  unit_of_measurement: "°C"

Configuration variables:

• state_topic (Required): The MQTT topic subscribed to receive sensor values.
• name (Optional): The name of the sensor. Default is ‘MQTT Sensor’.
• qos (Optional): The maximum QoS level of the state topic. Default is 0.
• unit_of_measurement (Optional): Defines the units of measurement of the sensor, if any.