My Problem is… When I install OpenHAB on my Rasperry Pi and my goal is to control my heating.
I surely need something like this: http://www.amazon.de/gp/product/B00FCX1WKM
But how does this communicate with my rasperry pi? … I have no Idea how this should work…
Personally i use a Homematic CCU2.
I think the cheapest way is to use a Homematic HM-CFG-USB Stick directly plugged into the Raspberry. But the configuration is a little bit harder.