Take a look here, it seems you have to add a switch in the config even if you don’t have any. As you’ll see, I created a dummy/false switch and it now works for me.
As for room and devices numbers, you would think the first room you create and add a device would be ‘R1D1’, but strangely not for me (R2D1, and R2D2 in my case). To get this information you go to the LightwaveRF web app and get the info by looking at the source code of the webpage if I remember correctly. You should be able to find a link to instructions on that somewhere. If not, let me know and I’ll see if I have it written down somewhere.