[Unit] Description=socat as virtual serial port [Service] Type=simple ExecStart=socat -d -d pty,link=/tmp/DEVTERM_PRINTER_OUT,raw,echo=0 pty,link=/tmp/DEVTERM_PRINTER_IN,raw,echo=0 ExecStartPost=/usr/local/bin/devterm_socat.sh Restart=on-failure RestartSec=2 [Install] WantedBy=multi-user.target