You can forget my previous post.

Everything is working now !! Awesome !!

Many thanks to irrbloss.

This is the good way to use domoticz with Razberry on Pi3 Jessie !!

(as you can see, I couldn't wait next week to try... now, it's time to go sleeping!)

Is your raspberry connected on Internet with cable or by wifi ? (to do apt-get and installation...) Other question : on the "Raspberry PI Configuration", on Interfaces, everything is disable except SSH on my fresh Jessie on sdcard. Do you have enable "remote GPIO"?? ('cause the razberry is plug on ...

Thanks a lot for your clear and quick answer.
(I will try next week, during holidays)

Thanks to irrbloss for this solution. I have spent many hours without solution, nothing worked. It is such a pleasure to read this tip. To resume 1. DL fresh Raspbian Jessie Image and write it to SD Card 2. Do all the apt-get update, apt-get upgrade and so on... 3. Install z-way, with following ...