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I would also like to know which protocol is actually used by the ELM327 to communicate with the vehicle. I am using ESP32 + Vgate iCar2. When using `sendCommand("ATDP")`, it...

> After setting the auto protocol (ATSP0 or ATTP0), you also need to make a request to initiate the protocol search and then wait for the protocol negotiation to complete....

You might try to remove paired devices using [this sketch](https://github.com/espressif/arduino-esp32/blob/master/libraries/BluetoothSerial/examples/bt_remove_paired_devices/bt_remove_paired_devices.ino).