Just got a new soundbar and (not surprisingly) the TV can control its volume via HDMI VolUp/VolDown commands, but can't read/set the absolute volume level. So my existing rule to reset the TV volume to something reasonable when turned on no longer works.
However -- Samsung Soundbar, so the new SmartThings app can control it directly. Is there an easy way to get comparable control exposed into Hubitat? I see some community projects around Samsung speakers, but they appear to be from an older generation of speaker that used a different app. Tried installing, but it doesn't see mine.
I think I am in the same boat with my N850. The newer ones use a special network and @djgutheinz has made a good integration for those. There is one for a Samsung TV that allows similar connection and feature as the ST side, but I have yet to be able to connect my soundbar.
All of these can be done with an interface to Hubitat <-> SmartThings cloud API. I don't have all the devices, but have been successful in other integrations with user support. It is really not that difficult, just several steps in starting.
Additionally, for the Soundbar, you could try my current driver and see what control commands (if any) work. Quick test and is totally local - but may not work.
It can not be readily done. I created the command toggleInputSource that will toggle through the inputs on your device. I would then create a button interface where the press executes that command. Then integrate that button onto the dashboard.