You might want to look into this library:
http://www.rossbencina.com/code/oscpack
There isn't a binary library prebuilt for VxWorks (the cRIO's OS), but it looks like you should be able to incorporate the source into your project with some modifications. It already has separate network code for Windows/Unix platforms, so in theory all you'll need to do is write the network code for VxWorks, and the rest should just work.