1) yes ssh worked
2) connmanctl gives no error but have not set the ip address
I tried this kind of command :
connmanctl config wifi_dc8551451451451_5555556c73_managed_psk --ipv4 manual 192.168.1.100 255.255.255.0 192.168.1.254
but the printers were never connected with the ip I have set
Thanks for your help