Step 1: Create MQTT Trigger in Home Assistant alias: Temperature MQTT Trigger description: "" triggers: - trigger: state entity_id: - sensor.living_room_temperature *- sensor.current_temperature* - binary_sensor.nest_on conditions: [] actions: - action: mqtt.publish metadata: {} data: evaluate_payload: false qos: 0 retain: false topic: tempwise/{{trigger.to_state.object_id}}/state_change payload: "{{trigger.from_state.state}}|{{trigger.to_state.state}}" mode: single