Knx binding with HomeServer Gira

Dear forum!

I am trying to connect OH2 to my KNX though a Gira Homeserver with USB Dataport. It works well via ETS. The log openhab.lg or event.log does not give me any information about the connection. A new item with the correct group-adresses does not send anything on the bus. It seems, that no connection is established to the bus. I tried both ROUTER and TUNNEL mode.

Any ideas?

Now i have something in the log:

2017-01-08 18:44:22.847 [ERROR] [org.apache.felix.configadmin ] - [, id=327, bundle=209/mvn:org.openhab.binding/org.openhab.binding.knx/1.9.0-SNAPSHOT]: Unexpected problem updating configuration org.openhab.knx
java.lang.NumberFormatException: For input string: “”

It seems that the knx binding dies not support EIB LiB. The HomeServer does only seem to speak EIB LIB though.