I may be able to help you. Softronic uses the exact same communication method as the factory Porsche system tester II and the PIWIS. If you want to be a dealer for Softronic, they have you purchase the Durametric software and cable (Durametric is a copy of the factory Piwis/PSTII software re-branded.

Do you know Jeroen in the Nederlands? Porsche guy who does graphics? he has been a long time friend of mine.

We need to chat. Skype?