How to pair and use a ScanTool OBDLink LX bluetooth OBDII adapter with Linux
These instructions have been tested on Ubuntu 20.04 LTS with a ScanTool OBDLink LX bluetooth OBDII adapter,
they should work with most Ubuntu and Debian derived distros.
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open a Terminal window
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install the bluetooth manager blueman (if not already installed):
sudo apt install blueman
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connect your bluetooth OBDII adapter to your car. Turn the ignition of your car on.
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run blueman in the Terminal window with the following command:
blueman-manager
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press the small green button on the faceplate of the ScanTool OBDLink LX bluetooth OBDII adapter.
a blue LED should start flashing rapidly.

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in blueman press the "Search" button.

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once the OBDII device is found right-click on the found device and press Trust and then press Pair
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a notification should pop up asking you to confirm pairing, Press Confirm

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write down the MAC address of your OBDII adapter and then close blueman.

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run the following comand in the Terminal window:
sudo rfcomm --auth connect 0 AA:BB:CC:DD:EE:FF 1
(write the actual MAC adress of your OBDII adapter instead of 'AA:BB:CC:DD:EE:FF')
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in a different Terminal check that Linux has created the serial device for it:
ls -la /dev/rfcomm0
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That's it, now you can run OBD Amigos (make sure OBD Amigos has been set up for the /dev/rfcomm0 device and the correct baud rate in the obd_amigos.ini file).
The next time you want to use OBD Amigos you don't have to do this pairing procedure again, all you have to do is run sudo rfcomm --auth connect 0 AA:BB:CC:DD:EE:FF 1
in a Terminal window and then start OBD Amigos.
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