An ongoing discussion about this feature can be found here: https://github.com/Koenkk/zigbee2mqtt/issues/775
When the availability feature is enabled, Zigbee2mqtt will ping devices to check if they are online.
In case a devices changes it’s online/offline state, Zigbee2mqtt will publish to
This feature integrates well with Home Assistant as devices are marked as
unavailable when offline.
To enable availabilty, add the following to your
advanced: availability_timeout: 60
availability_timeout defines the interval in seconds at which devices are pinged.
Note that only non-battery powered devices are checked for availability.
availability_timeout: 0 is set, which means that this feature is disabled.
In order to exclude devices from this feature use
advanced: availability_timeout: 60 availability_blacklist: ['my_bulb'] # = list of friendly names
While this feature is enabled and a bulb reconnects or announces itself on the network, Zigbee2mqtt will retrieve the new state of the device. This will make sure that e.g. a bulb is powered off and on again the state (on/off, brightness, color temperature or color) is correct.
Note for CC2530/CC2531 users
As this feature increases the amount of messages on the Zigbee network, it could cause stability issues when you are using a CC2531 or CC2530 as adapter.