You will have to wait for Arylic to respond. Maybe they have commands that work, maybe they don’t
I did the TCP/IP documentation for passthrough to UART. Without checking my documentation I am pretty sure that it covered some of these things. It’s not published yet.
So help me understand, why only UART for you ? Are you meaning commands with a serial cable ?
Q. Streaming Quality - this is a tricky field. Broadcasters can cheat so they announce a High Resolution but the actual resolution is lower (or even more important the recording quality maybe less than the broadcasting quality) . My personal Opinion is this is a “can of worms” and the best measure is our ears
Also note that Arylic Hardware is based on Linkplay Platform https://www.linkplay.com/ so there will be limitations on what Arylic can do.
If you can post you’re Hardware, Software & Network Architecture along with a brief what you are trying to achieve I am sure I can advise what can be done now and what you will have to wait for Linkplay & Arylic to add.
I am not a huge fan of httpapi but TCP/IP Socket Communication works for me. Not just with Arylic Products but more or less every device in my homes. (not a fan of MQTT or RF433Mhz either but sometimes there is no alternative).