Wanted to add some further devices, such as 3 rollercurtain modules of fibaro.
Could not get them coupled, added a range extender, still nothing.
Then experimented with a neo coolcam module adding it , deleting again, 1 meter further, try again… Untill it got out of direct reach and had to use a hop.
Appearantly you cannot add a device over a hop/ router. You need to add it direct.
After adding, you can move it so it uses routers.
Cant remember how i added all my other zwave devices.
In this case it was not very practical, as the modules have quite some wiring, i build in a box together.