This sounds more like your playback device needs to be able to talk to the speaker.
Why should the Jellyfin server do the talking?
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Current stable release: 10.10.0
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Good question. I just don't know how any of this works. I can see the speaker and play a single song via the jellyfin app. There is a limited control via the Raumfeld app. But it stops after one song and there is no queue in both apps.
So is this an issue with jellyfin or hardware / firmware related?
I have a bit of a prototype software package and service to serve jellyfin content on satellite devices, if you want to have a look: https://github.com/MattMckenzy/Homehook/tree/v2
It's actually mostly complete and fully functional, just in need of some serious documentation and installation instructions hahah.
If you're interested in trying it out, feel free to send me a PM and I'd be happy to help!
Looks interesting, but yes, I could use some instructions. I'm running Jellyfin on DietPi on an Odroid HC4.