So if I have a Fire Stick 4K on Samsung TVs, is this considered an Android solution in this context?

If it is, and I hope it is, does it suddenly become less clear when Amazon transitions to the new OS I think I was reading about called Vega? Or is that just for Fire TVs?

The Fire Stick 4K is ...

I guess we could do some form of login which then queried the api server for device information.

or even if i could do a one time set of the hdhomerun ip address that the app could remember and use if upnp fails. not as elegant or user friendly as your solution but perhaps simpler as it requires ...

got this installed. the install video was very straightforward. enabling developer mode did not work initially. some googling indicated entering 12345 very quickly which did work. receive the following error at app launch:

Version 20220204d
UPnP discovery is not supported or not working on this TV ...