Thanx for your help, it worked
But I made a mistake that I can't repair !
"Calibre Companion" told me to try to connect with the calibre wireless connection before, to test.
It worked with an automatic ip, so I tried to give a fixed ip (192.168.1.200) in the the device confinguration, in the device menu that appeared once it was connected.
It didn't work, so my device menu don't appear again (normal).
As it doesn't appear again, where can I set my device parameters to connect to an automatic ip again ??
Thanx for your help again