[Unit]
Description=Attach /dev/ttyS1 to BlueZ stack
Before=bluetooth-agent.service
PartOf=bluetooth.service

[Service]
Type=simple
ExecStartPre=/usr/sbin/rfkill unblock bluetooth
ExecStart=/usr/bin/rtk_hciattach -n /dev/ttyS1 rtk_h5 115200
ExecStopPost=/usr/sbin/rfkill block bluetooth

[Install]
WantedBy=bluetooth.service