I use e-sys and E-net
The cable is easy to find off Amazon or AliExpress. AliExpress is cheap but takes a long time, but it gets here eventually. OBD port, some CAT6 cable, a resistor and an RJ45 on the other end. No special electronics. Bid or Buy has them sometimes between R250 and R1500 depending on how much of a chancer the seller is :roflol:
I will swing past a place tomorrow to see if they have OBD2 connectors, though with a complete, tested cable ex China for under R200 it is hard to imagine this will be a worthwhile exercise.