Bidirectional DMX = RDM

has anyone tried getting RDM working with OF.
i am not sure where to start?

Are you working with a specific piece of hardware? You might find that is a good place to start if you are dealing with a serial interface. Perhaps @kylemcdonald might have additional thoughts.

i have worked with ofxDMX a lot but have not found an easy way to get also data back in.
But maybe i have to dig deep in to the library.

Also, if you want some more advanced serial control to continue building, you might check out my new ofxSerial addon. It supports all of the platforms, allows flow control, etc.