[User 224999]

authentication and browsing songs works.

However playback doesn't work on 1.1.22 on ODROID C2 Libreelec (32bit userspace) Kodi 17.3.
Not sure if I missed something or doin something wrong!?

Hmmm, looking at your log it seems that something is going wrong because you can clearly see that Kodi is trying to start the playback over and over and finally gives up.
I will add some more logging in the code so maybe we can spot what's happening.

In the meanwhile maybe you can test something? In the addon settings, there's an option called "buffer entire track"
This will slowdown the start of the track but it might fix the issue. Instead of receiving the trackdata frame by frame, the entire trackdata is requested from the server and sent all at once to the Kodi player.
remember to restart/reboot Kodi after you changed that setting.