My TV is wifi only and is not found by HASS when off. I would love an option to turn on with Chromecast/ARC and then rescan for the device to allow for control. Anyway to get that added? Is it already available?
You could specify it manually if it’s not found.
New devices should be found even after HA boots 
It’s specified manually with a host but if it’s not on when HA starts it never shows up. Log days unable to find device at IP.
That’s strange. I’m certain it works in my network with the discovery component. I’ll experiment a bit tomorrow and see if I can replicate it.