I finally figured out what Twonky Unique ID is meant to be by twonky.vTuner.com and I got feeding of radio stations to work.

However, when I try to access a station, PS3 says incompatible data. It shows the correct radio station name in its properties but does not play it.

PS3 firmware is 2.01
All else works as supposed.
I am sure it is a PS3 bug but can Twonky comment about when a workaround may have included in Twonkymedia, and what the likely technical cause may be? Maybe, it is as easy as unlimited play time or so.

Thanks,
Falk