http://silabs.org.ua/bc4/hc06.pdf
http://42bots.com/tutorials/hc-06-bluetooth-module-datasheet-and-configuration-with-arduino/
http://www.blueluminance.com/HM-10-as-iBeacon.pdf
https://rydepier.wordpress.com/2015/10/22/comparing-the-hm10-and-ble-cc41a-bluetooth/
BOLUTEK BLE-CC41-A Bluetooth Module
http://www.instructables.com/id/How-to-Create-an-Arduino-Compatible-Bluetooth-40-M/
https://github.com/tigoe/BLEDocs/wiki/Introduction-to-Bluetooth-LE Introduction to Bluetooth LE
https://ard10n.wordpress.com/projects/4-0-ble-bluetooth-module-hm-10-cc2541/
http://www.hangar42.nl/index.php/2015/08/14/hm10/
http://www.instructables.com/id/How-to-Create-an-Arduino-Compatible-Bluetooth-40-M/
https://github.com/jeremy-prater/OS-CC2540
http://christinaa116.en.ec21.com/CC2541_4.0_Bluetooth_To_Uart--9048954_9049026.html