Even though ButtonImmobilizer is supported, and "fancy", it is not the only possible solution for immobilizer, and NOT the best in all cases (since the 2nd serial port is more useful for [Android VemsDisplay].

BT-RS232 is usually used for second serial => BT-RS232 => Android vemsdisplay

http://vems.hu/android/ This is INCOMPATIBLE with "1-wire interface: yes " option (which is not the default, and NOT recommended anyway) ...

Antitheft and/or wallet mode can be handled in other, better ways (eg. configswitch/tableswitch [config-switch] or a hidden switch, or magnet + hidden reed relay with self-holding relay for fuel pump - this saves several expensive cars for us and for our customers).

* Although BT-RS232 can theoretically be used for first serial => BT-RS232 => VemsTune

** (2 BT-RS232 necessary if used at the same time, although VemsTune has all the information so the Android is not needed during tuning anyway).

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* In any case, for VemsTune it is

more usual to use https://shop.vems.hu/catalog/bluetooth-rs232-adapter-p-212.html