Ledesc D200

[thumb5]

I do not understand....
The wifi is set up, on the dev screen it's ok, ip showed... But I can't ping it....

Is the wifi faulty ?

Sounds unlikely that the wi-fi is faulty if it's connected to the AP and been assigned an IP address (I assume you're using DHCP).

Firewall problem?  Are you pinging it from a PC or Mac? Oh, I see you mentioned "task bar" above so I guess a PC. Might be worth trying with the firewall disabled, temporarily.