Hi Simon,
I have some basic Mathematica code which can drive an EV3 lego robot over the bluetooth connection, ie control motors and read sensors etc.
The code is used in an internal project of mine:
Youtube video
It uses the Serial IO package to stream commands to and from the EV3 brick.
Please feel free to get in contact, my email address is
julian.w.francis @ gmail.com
The code is a bit hacky, and good do with some improvements, but it does work.
Kind regards,
Julian