I finally got the setup to work. Strange thing is I've been retrying the same thing over and over again. This was my last try otherwise I would have ordered an USB Z-Wave stick. If I have some spare time I will image my current SD and try to figure out which settings Z-Way server configures. That ...

@irrbloss, did you install the sources of open z-wave and domoticz or did you install the stable/beta binaries?

I've been struggling, with the same problem for a while now. Domoticz does recognize my RaZberry but doesn't include any z-wave nodes.