Not my space, but googling around a bit on how ADTS works, it can include everything needed to send a "playable" bit of MP3 data in a single frame.
So it seems like if you started sending multicast packets, the sound would be interleaved with the other stream. If you used a lower bitrate (they are using 192kbps) you could have a bigger piece of the playing time slice, since each of your packets would be a longer running snippet. Similarly, going mono vs stereo would extend that more.
Given that it's a hotel, lots of the devices probably have default admin passwords though, so shutting off the other stream is probably not hard :)
So it seems like if you started sending multicast packets, the sound would be interleaved with the other stream. If you used a lower bitrate (they are using 192kbps) you could have a bigger piece of the playing time slice, since each of your packets would be a longer running snippet. Similarly, going mono vs stereo would extend that more.
Given that it's a hotel, lots of the devices probably have default admin passwords though, so shutting off the other stream is probably not hard :)