More info on how this is done would be useful.


Please have a look at my web site:

http://www.airventdisplay.no/en/online-store/bluetooth-le-solutions.html

Assuming you have a fully functioning e46 m3 setup, there are several options, dependent on your needs and requirements.

In its simplest ...

I do not know if there are any interest of this....

I have made a device for streaming CAN data over BLE to HLT. I have also included 10Hz GPS data, interfacing an Adafruit GPS.

The following measurements are streamed to HLT over Bluetooth LE with 25Hz:
RPM
Speed
Throttle Position
MAF
Wheel ...