https://draapho.github.io/2017/04/19/1713-ble/
https://www.bluetooth.com/specifications/gatt/descriptors
http://yegang.hatenablog.com/entry/2014/08/09/195246
https://draapho.github.io/2017/04/19/1713-ble/
https://www.bluetooth.com/specifications/gatt/descriptors
http://yegang.hatenablog.com/entry/2014/08/09/195246