I’ve written a module  for GNU Radio that can receive, demodulate and decode messages sent with a CC1100 transceiver. I’ve tested them with a Homematic door/window sensor. Until now its only a receiver so I can’t transmit anything but a 10€ RTL-SDR dongle is all you need. Would it still be possible to connect this sensor to Homegear without actually transmitting anything, would pairing still be needed in some way? The GNU Radio module that I have simple pipes the payload of the received frames to a UDP socket. Would it be possible to have a UDP or TCP virtual physical device for Homegear to test it with?