Hello, I am running version 3.04 and have installed all the latest firmware for the NXT and still cannot get the wifi connection to work with RobotC. It does work with the FTC field control system though.

While it doesn't solve your problem, I can confirm that we've also spent quite a bit of time trying to connect to the brick through wi-fi and had zero success. This was also using V3.04 w/latest firmware. The Field Control System talks to the brick, just nothing direct from RobotC.