Publishing payload_available or payload_not_available topic

[heyheyhey]

HI

I recently made a device with KC868-H32b that allows me to communicate with HA. It works as expected, 

and I am able to send and reserve messages to and from the KC868-H32b.

The issue I am facing is that when the KC868-H32b is unplugged from power  


HA remembers the last known state the KC868-H32b was in, rather than updating the front end to show that the device has 

gone offline.


So, Is it possible to publish custom topic on kc868-h32b?

For example. 

payload_available and payload_not_available 

Thank you