Documentation for the ZWay API is here: http://docs.zwayhomeautomation.apiary.io . If you end up needing to create a module, documentation on that is here: http://developer.z-wave.me/?uri=help . Not sure about the issues with UZB and the Pi3, but apparently it does work: https://forum.z-wave.me/view...
Thanks Minux, the module worked (unlike the other one, that did nothing). I have updated it a bit to deal with Ambience lights. For Ambience lights my version now: Creates a dimmer for colour temperature (unfortunately there's no proper UI element for this). Doesn't create the unnecessary Saturation...