Создаем пару виртуальных портов:
    
    $ socat -d -d pty,rawer,echo=0 pty,rawer,echo=0
    2023/10/01 03:18:39 socat[965194] N PTY is /dev/pts/16
    2023/10/01 03:18:39 socat[965194] N PTY is /dev/pts/19

Запускаем писателя на другой консоли:
    
    $ ./writer.py
    Write: GET_A
    Write: GET_B
    Write: GET_C
    Write: GET_NORESP
    Write: INVALID_CMD
    ...

На следующей консоли за пускаем парсер:
    
    $ ./reader.py
    01-10-2023 15:17:07 DEBUG:read: GET_B
    01-10-2023 15:17:07 INFO:response_str: B_5V
    01-10-2023 15:17:09 DEBUG:read: GET_C
    01-10-2023 15:17:09 INFO:response_str: C_15A
    01-10-2023 15:17:11 DEBUG:read: GET_NORESP
    01-10-2023 15:17:11 WARNING:No value for sensor: NORESP
    01-10-2023 15:17:13 DEBUG:read: INVALID_CMD
    01-10-2023 15:17:13 WARNING:Command parser error: Unknown command: INVALID
    01-10-2023 15:17:15 DEBUG:read: GET_A
    ...