Create sensor or binary_sensor from switch (unavailable)

@ronny06 wrote:

Hello,
I need a binary sensor that tell the state of my sonoff switch if ON or OFF.
I create a following but in home assistant is always “unavailable”

  - platform: mqtt
    state_topic: "stat/sonoff4pro2/POWER1"
    name: "Tapparella_stato"
    availability_topic: "tele/sonoff4pro2/LWT"
    payload_on: ON
    payload_off: OFF
    value_template: "{{ value_json.state }}"
    device_class: "door"

The result of the sensor in the home assistant is “unavailable”
Perhaps there is something wrong in value_json and in the device_class.
Can someone help me?

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