error in UDP wifi transmission

[totoantibes]

First, thanks for this code.
I found that there is an issue at the very end of it. you need to correct:
udp.beginPacket(remoteIp, port); // remote IP and port
to
udp.beginPacket(remoteIp, udp.remotePort()); // remote IP and port

otherwise connection is not established with the remote party
(the need of the temp variable remoteIP is questionable since you can access it via udp.remoteIP())