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If you look at pin 1 on a recent BMW OBD socket you will likely see it is unpopulated (please tell me if you do not find this on E/F series cars since 2010/N55). Pin 16 is continuously powered. Pin 8 is so that you only enable ethernet when a device is plugged in to avoid FM radio interference.
It is an interesting idea to have the cell phone make a hotspot the same as the home network. How does this differ between Android and iOS? My problem for another OBD device is how to have the phone connect to home WiFi whilst also connect to the OBD device, but still connect to the device when away from the home network with minimal or no fuss.
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