How to start automation when sensor is updated with any value?

Configuration
1

Hello. I get irregular notifications from sensor, only if something happens. Therefore I would like to start automation every time when sensor sends new value. That may be same value as few days ago, so in fact the sensor does not change state, it is just updated with same value. How can I do that please?

2

According to State trigger:

Fires when the state of any of given entities changes. If only entity_id is given, the trigger will fire for all state changes, even if only state attributes change. If only one of from_state or to_state are given, the trigger will fire on any matching state change, but not if only attributes change.

So use a state trigger and do not fill in either to: or from:. This, of course, assumes the sensor updates somehow even if the state value doesn’t change (e.g., an attribute changes.)

3

Thanks I am testing it. In the meanwhile, I discovered I can create trigger on incoming mqtt event:

alias: Test telegram
description: ''
trigger:
  - platform: mqtt
    topic: mqpr03_210312/sensor/mqpr03pr2/state
condition: []
action:
  - service: notify.jan_b
    data:
      message: Topic received
mode: single