i had the same problem. tried with 2 different wifi modules and no luck. sent the box back to the supplier. he can´t test it and asked me to send the wifi module - i did and conveniently he says it´s not arrived.... anyway, excuse my griping. will let you know if this problem is due to either a defective box or a general problem. i believe it´s the box.
btw, i emailed duolabs about the problem and they said the wifi feature was implemented and should work. when i asked if this could be a problem with the box itself they didn´t reply.