Hi all, I’m not sure to understand how the availability topics should work in MQTT components (binary sensors, switches, etc…).
It’s clear that if HA receives a message on the related topic (availability_topic) the UI will reflect the status.
But how a non-available device might send such a topic? I cannot understand this!
I have several binary sensors connected to my radar and PIR sensors. If they lost the connection (due to loss of power, network unavailable, etc…) I want to know immediately in order to trigger a warning.
Would you mind to explain me how to know the availability of these devices?