MQTT automation with condition based on incoming mqtt

Configuration
1

How do I access the value of the incoming mqtt message to trigger my automation?

- trigger:
  - platform: mqtt
    topic: "topic/temperature"
  condition: "{{ value != states('sensor.entity')|float() }}"
  action:
    - service: mqtt.publish
      data:
        topic: topic/Refresh
        payload: "1"
  mode: restart
2

https://www.home-assistant.io/docs/automation/trigger/#mqtt-trigger

Because the payload option only supports limited templates, which do not include functions like states(), you’ll probably have to do something like this:

- trigger:
  - platform: mqtt
    topic: "topic/temperature"
    value_template: "{{ value != states('sensor.entity')|float() }}"
    payload: 'true' 
  action:
    - service: mqtt.publish
      data:
        topic: topic/Refresh
        payload: "1"
  mode: restart

The value_template evaluates the received message first and then if the payload option matches the result of that template the trigger occurs.