so i found the solution on my own. It's always better to read all output you get.
Kbluetooth needs this curious sdpd daemon which you can't find in bluez-utils package because this service is integrated into hcid.
A very helpful option of hcid was to start it with
hcid -n --> you get more information
but the clue was to start it like this:
The "-s" option proposes the sdpd service for kbluetooth. Now everything works fine
For normal use the "-n" option is unnecessary but it tells you if you have configration failures.