Got it working this evening
Upgraded my Vems to 1.1.95 from 1.1.74 at the same time.
Initally I got nothing, but when using the serial port on the PC with terminal VEMS was sending AIM data.
When the USB serial was connected to the bluetooth module I could also communicate.
Then swapped the TX and RX cables to the MAX232 interface and it worked. Not tried it with the engine running yet but the pedal seemed to track smoothly.
If you are looking for an android bluetooth serial terminal then the only one that I found to work was one called SENA Bterm - it works pretty well