Ok. I will try that. By now I was trying to make it work on UNO but I got a bug using Ethernet shield2 on uno... if I call localIp() it return 255.255.255.255 address instead of ip... but I still can ping the arduino from command prompt.
I got the bug even with example... strange.
When I use the websocket server example, I can't establish a connection.... it got refused...