[Unit]Description=Broadcom BCM43438 bluetooth HCIConditionPathIsDirectory=/proc/device-tree/soc/gpio@7e200000/bt_pinsBefore=bluetooth.serviceBindsTo=dev-serial1.deviceAfter=dev-serial1.device[Service]Type=oneshotRemainAfterExit=yesExecStart=/usr/bin/btuart[Install]WantedBy=multi-user.target