http://www.race604.com/gatt-profile-intro/
https://learn.adafruit.com/introduction-to-bluetooth-low-energy?view=all#
https://www.bluetooth.com/develop-with-bluetooth
https://www.bluetooth.com/specifications/adopted-specifications?_ga=1.183356518.1180328376.1445619842
http://bluetooth-pentest.narod.ru/doc/assigned_numbers_-_service_discovery.html