Trigger sensor update, despite no sensor change? trigger mqtt update

Configuration
8

Ok, hmm, thanks for helping out. I have tried this automation on both sides…

- alias: 'Update alarm sensor'
  trigger:
    - platform: state
      entity_id: sensor.alarm_last_update
  condition:
    - condition: template
      value_template: "{{ trigger.from_state.state != trigger.to_state.state }}"
  action:      
    - service: homeassistant.update_entity
      entity_id: sensor.alarm_active

They trigger nicely every time sensor.alarm_last_update updates every 10 seconds from the alarm server, but this one does not do what I want : )

- service: homeassistant.update_entity
  entity_id: sensor.alarm_active