I switched the tool now to Ruby which brings the following benefits against the bash version.
- Much faster in the during file comparison for deletion (Tested with a fileset of 8000 files)
- You can now sync your USB Stick, for example useful for the car
- With different configurations it is possible to run multiple instances at the same time and sync all your devices parallel
You find the new version on github: https://github.com/wefixit-AT/AndroidWifiMusicSync