this thing is really pissing me off. I've been hammering it with different telnet command combinations for days.

Nearest I can tell is you can't add a single song to a playlist or a favorites list. You can only add what's in the currently playing queue to a playlist or favorite list which is patently stupid.

You can browse your list of favorite groups but you can't browse what's inside that group unless you add it to the currently playing queue. You can browse a playlist though.

For playlists
Command:
BrowsePlaylists
Response:
BeginPlaylists Total=2 Start=1 Alpha=1 Caption="dogs#it"
Playlist {e3b460d2-ae3f-9721-f820-abb25e13b5ce} "dogs#it" 15 1 -1 "" "" ""
Playlist {3cbf78dc-28c2-1e69-f97d-77efb3e0e8a2} "test" 2 1 -1 "" "" ""
EndPlaylists NoMore

Command:
SetMusicFilter playlist=e3b460d2-ae3f-9721-f820-abb25e13b5ce

Command:
BrowseTitles
Response:
List of titles in the playlist.

You would think the same string of commands for favorites would work
Command:
BrowseFavorites:
Response:
BeginFavorites Total=3 Start=1 Alpha=0 Caption="Favorites"
Favorite {672353f1-51d8-08cf-f82f-adf5f5da0a3d} "cat" 6 "EditPreset" "" ""
Favorite {cc515315-ad7b-7966-e5d2-278e20243a02} "dog" 6 "EditPreset" "" ""
Favorite {555082e6-b9dc-589e-90f9-dcb0af0eb9ca} "f#ck" 6 "EditPreset" "" ""
EndFavorites NoMore

Command:
SetMusicFilter Favorite=cc515315-ad7b-7966-e5d2-278e20243a02
eeeerhn unkown media object

Command:
SetMusicFilter Playlist=cc515315-ad7b-7966-e5d2-278e20243a02

Command:
BrowseTitles
Response:
Empty list


And why no navigable interface on the HDMI output? Just stupid.

Got to setup port mirroring on my switch so I can mirror packets between the tunebridge app and the MMS to my PC so I can try and sniff out undocumented commands and hope there's something there I can use.

If that fails I'm going to have to build playlists and favorites internally in my command fusion interface with persistent state variables