Generic trigger for when any device goes unavailable?

[kmorris81]

My goal is to generate a mobile notification when any device goes to an unavailable state.

I suppose the first question is: Does pyscript get notified when a devices goes unavailable?
Second: Is it possible to write a generic @state_trigger() that captures when any device transitions to unavailable?

Any thoughts/recommendations on how to best implement this would be appreciated.

[stefanuytterhoeven]

I can't you fully answer that. I just made an app in pyscript, defining the different entities that should be watched...
I used trigger closures. Look at the docs.
It worked if I created a closere per entiity. But, I got stuck checking multiple entities in 1 trigger condition. See #231
So, it is possible yes.
Be aware, it can take a little time before the "unavailable" state is set. But, that probably depends what kind of entity you check.
e.g. I have DECONZ (zigbee) integration and hue spots connected to CONBEE2 stick.
When I power off the spots , it takes a few minutes before DECONZ "sees" that, and therefore Home assistant.

[dlashua]

I would use an @event_trigger if the goal is to watch ANY entity. And, yes, pyscript is notified on a state of unavailable.

[kmorris81]

Thanks! I ended up going your suggested route:

from homeassistant.const import EVENT_STATE_CHANGED

@event_trigger(EVENT_STATE_CHANGED)
def unavailable_checker(entity_id, new_state, old_state):
    if state.get(entity_id) == "unavailable":
        log.info(f"{entity_id} is unavailable.")
        notify.mobile_app_my_phone(message=f"ALERT: {entity_id} is unavailable.")

Works like a charm!