Casting full device lossless audio to UPnP

[simbun]

I'm not the Simon you're addressing but I do own a WiiM Pro so can add some context from that side.

Of the main services, Qobuz is currently limited to 24/96 through Google Cast until Qobuz Connect is released (which is currently in beta), and Apple Music - which I believe is only available on Android based streamers such as the Eversolo in a lossless format - is limited to lossy AAC, everything else is bit perfect.

I'm not sure what else you're casting but it's unlikely to be higher than 24/96, so Google Cast is the right protocol to use in those scenarios - unless you're using it to cast local music given it's not gapless - as app UPnP support is limited.

I've never looked into Apple Music - being an Android user - but personally I wouldn't want to use my phone to capture the audio and relay it to my speakers, but if you do want to progress this I'd ask the question on the BubbleUPnP Google Groups as I don't believe MinimServer can help here.