I am really confused about the operation of the OBD2. I have always thought that it is read only, and I see these apps starting there car remotely using OBD dongles. How do they get the stats remotely? If I would to use an arduino with GSM, what procedure do I need to make it work with my phone? The tutorials I've seen were about close range using Bluetooth. Any tutorials about this project?
I am not asking for step by step, but a path to achieve that.
Thank you