I have recently been trying to get UDK to "talk" to Processing in order to cause events to occur in the game(UT). I have been able to make Arduino communicate by using AACKeys software (it's a hack, I know), but I have not been able to figure out a way to communicate the other way (UDK -> Processing -> Arduino). This seems like it would be somewhat doable but I can't figure out the best way to make it happen. Any ideas?

I know a little bit of UnrealScript, but not a ton.

I have used Unity to do the same exact thing but I prefer UDK for the project I am working on now.

Does anyone have any experience with this sort of thing?

Thanks in advance.