Is there a Blueprint UDP Listener?

Correction. It looks like they’ve separated the UDP functions, in the Common folder I see

UdpSocketBuilder.h
UdpSocketReceiver.h

The builder has a class FudpSocketBuilder, which just has a description for the constructor. But then the function BoundEndpoint would need to be called (with the ip address and port)

(I don’t understand the multicast or broadcasting stuff)

Then the receiver class has an object FUdpSocketReceiver the socket that was just created, and I imagine that would also run at “game start” as well.

It accepts a few variables, the Socket that was just created, the time to wait, and a description for debugging.

Then there’s something in the "FOnSocketDataReceived& OnDataReceived(), which “returns a delegate that is executed when data has been received”

I don’t REALLY know what that means, but I imagine it’d be great if that delegate was a function that fired an Event, which the BluePrint item could be listening for and react to.