Perhaps not the most elegant solution, but I've solved it using RFXcmd and calling an external bash script. I can only turn the device on/off, but I typically do not adjust the light intensity once set, so that is fine. Basically, RFXcmd can be used to fake a lighting4 command which is accepted by ...

Beside my KaKu devices I have an older wireless LED dimmer which seems to work on the 433 MHz band. Using RFXmngr I figured out that the device is sending out codes which are currently not supported by the RFXcom firmware, but can be emulated using the lighting4 protocol. I used undec to figure our ...