IMO, the first version of the so said hardware should be deliberately simple.

Must have features:
    * MELBUS emulation
    * Line in

Really nice to have features:
    * RTI emulation (requires CAN interface and connection to RTI screen)
    * Video input - either for reverse camera, or media player
    * Bluetooth module with A2DP and AVRCP 1.3+
    * Configurable comfort features- automatic windows, minimal number of turn signals, enabling camera and popping up RTI screen when placed in reverse.

Over the top features:
    * Second CAN interface for high speed CAN.
    * K-line.
    * Custom case which replaces HU entirely, with a touchscreen and Linux SBC.

[[Simple Melbus Emulator- SME]]