Gapless (groan) with RoPieee and BubbleUpnp

[simbun]

I just tried Ropieee and gapless playback was fine with BubbleUPnP, having configured 'Gapless control' in the settings, otherwise there was a small gap.

As a more thorough (and quicker) test I use sox to cut a song into smaller chunks.
BubbleUPnP didn't manage the queue of 3 second tracks but it successfully played the 8 five second tracks gaplessly.
If I enabled OpenHome support (which you'd probably want to do unless you're already using BubbleUPnP Server for that) in Ropieee the 3 second tracks played flawlessly too.

I'm sure you checked the right place, but just in case:
Menu > Settings > Renderer Settings: ropieee > Gapless control.