How to add MQTT thermostat to configuration

Hello everybody,

I try to add my ecozy thermostat to Home Assistant.

I added this like described at the website, but it does not work:

After some research I changed the configuration like this:

  - platform: "mqtt"
    name: Küche Thermostat
    availability_topic: "zigbee2mqtt/bridge/state"
    min_temp: 7
    max_temp: 30
    current_temperature_topic: "zigbee2mqtt/0x70b3d5de0000XXXX"
    current_temperature_template: "{{ value_json.local_temperature }}"
    temperature_state_topic: "zigbee2mqtt/0x70b3d5de0000XXXX"
    temperature_state_template: "{{ value_json.occupied_heating_setpoint }}"
    temperature_command_topic: "zigbee2mqtt/0x70b3d5de0000XXXX/set"

However, I can not set the temerature. Can anyone help me?

Thank you so much!