yaourt -S btscanner
pacman -S bluez-utils

dbus-send --system --dest=org.bluez /org/bluez/hci0 org.bluez.Adapter.SetMode string:discoverable
hciconfig hci0 piscan

dbus-send --system --dest=org.bluez /org/bluez/hci0 org.bluez.Adapter.SetMode string:off
hciconfig hci0 noscan

hciconfig
hciconfig hci0 up
hcitool scan
l2ping MAC
btscanner

sudo bluetoothctl
agent on
default-agent
pair MAC
connect MAC

參考 https://wiki.debian.org/BluetoothUser http://shyuanliang.blogspot.tw/2014_10_01_archive.html https://github.com/karulis/pybluez https://www.cnet.com/how-to/how-to-setup-bluetooth-on-a-raspberry-pi-3/