VAG KKL 409.1 on Ubuntu Linux

sudo apt install wine // and install VCDS, cable drivers already are in Linux core, interface will be found and cable indicator will be active only when connected to car, on PC - Port OK, interface not found.

Identify COM ports on Linux

sudo dmesg | grep tty

ls /dev/ttyS* // typically refers to hardware serial ports.

ls /dev/ttyUSB* // refers to USB-to-serial converters.

ls /dev/ttyACM* // refers to USB CDC (Communications Device Class) devices.

lsusb

udevadm info -e | grep -E 'DEVNAME|ID_SERIAL'

Create the Symbolic Link

cd ~/.wine/dosdevices

ln -s /dev/ttyUSB0 com1 // map /dev/ttyUSB0 to COM1

rm com1 // if it exists and not needed

ls -l ~/.wine/dosdevices // verify the symbolic link

Add user to dialout group

sudo usermod -aG dialout $USER // add your user to the dialout group

cat /etc/group

grep dialout /etc/group

groups user

Change permissions

ls -l /dev/ttyUSB0 // list permissions

crw-rw---- 1 root dialout 188, 0 May 28 12:06 /dev/ttyUSB0

sudo chmod a+rw /dev/ttyUSB0 // change permissions

sudo lsof /dev/ttyS0 // If no output is returned, no process is currently using it. Ignore error.

Create a Test Script

sudo apt-get install python3-serial

touch test_serial.py

import serial

port = '/dev/ttyS0'
baudrate = 9600

ser = serial.Serial(port, baudrate, timeout=1)
ser.write(b'Hello, serial port!\n')
response = ser.readline()
print(response.decode('utf-8'))

ser.close()

python3 test_serial.py // run script