I'm testing this with my Fröling SP Dual 20 (V 50.04 B 05.19). But I assume it could also work for other models that have the Lambdatronic 3200 control unit. Feedback appreciated. I requested and ...

Currently, one IRQ needs to be executed for each byte and the bits are read manually. A while (true) reading from the pins and doing the handshaking might be better suited. A FIFO-buffer should be ...