This video tutorial is about locally testing a RoboRemo interface. You simply connect via UDP to localhost:9999 (or other port), so all the packets that the RoboRemo is sending will come back to it, and will be interpreted as received from the remote device (Arduino or whatever). I personally use this pretty much for testing the functionality of the app. to make sure everything works as expected. I think this is a faster way to test the interface that you build, so I thought to share this trick with you.