thanks, will give it a try. actually I forgot that I changed one more thing. I assigned a static ip address to my CCU, but eventually configured this back in openhab so that the CCU was detected as usual. Anyway will report back if it worked.
In deed it’s working now. I noticed that the binding was updated from 2.2 to 2.3 and now autodetects my CCU2
So I uninstalled the binding, deleted my .things file and re-installed the binding. Finally I re-added the CCU2 as thing, added the homematic devices as well as thing and made the changes to my .items (new channel) file.