I’m currently developing a music service and testing it via customsd. The integration in the controller app is working (iOS App & Windows Desktop App) - so I can browse - but I can’t get a Player to play any track. I keep receiving ‘unable to connect’ errors once I hit the ‘Play’ button in the controller. I can see on the service side that the Player sends a getMetadata and a getMediaURI request, and the SOAP responses delivered by the service are identical to working examples from another source; however, the Player seems unable to process them. I am kind of stuck, and I guess what would help me are the Player logs. Is there any way to get them?
Or, does anyone have any other idea about the root cause of the issue?

EDIT: More or less accidentally, I came across the reason of my problem. Whereas in general, Sonos can handle arbitrary IDs, getMediaURI only seems to work when it requests the URI for an ID of the form track:something. I don‘t remember seeing this as a requirement on the developer pages.

Anyway, got it working now.