I have an app on my iPhone called iSeismometer which reads the iPhone's accelerometers and acts as a server which streams this data via UDP (I can set the IP address and port number). The question is how to read this data stream with Mathematica? Apparently, Dreeves has been looking into this 12 years ago, so I imagine something must have happened in the meantime.
I got two great answers so far; one from WReach and one from Mark McClure. Both are using JLink to get at the data. This seems like a fine approach. However, I was reminded of some work I did on the WII balance board. Using a few free programs (GlovePIE and PPJoy) I got this bluetooth peripheral to appear as a joystick to Windows, and therefore also to Mathematica (via
ControllerState). Of course, bluetooth and UDP are quite different, but could something along the same lines be made to work too?