[Unit] Description=Configure Bluetooth Modems connected by UART ConditionFileNotEmpty=/proc/device-tree/soc/gpio@7e200000/bt_pins/brcm,pins StartLimitIntervalSec=300 StartLimitBurst=6 After=dev-serial1.device [Service] Type=forking ExecStart=/usr/bin/btuart ProtectSystem=full Restart=on-failure RestartSec=3s [Install] WantedBy=dev-serial1.device