Для теста сделай самым простым способом, епт
erial error: [Errno 13] could not open port /dev/ttyUSB0: [Errno 13] Permission denied: '/dev/ttyUSB0'
Connecting...
[ERROR] Could not connect to /dev/ttyUSB0 at baudrate 115200:
Serial error: [Errno 13] could not open port /dev/ttyUSB0: [Errno 13] Permission denied: '/dev/ttyUSB0'