Based on the example USB HID keyboard https://developer.mbed.org/users/jbru/code/BLE_HID_KeyboardStreamDemo/

Dependencies:   BLE_API mbed nRF51822

Fork of HID-kb by Microbug

Revision:
0:cb1939018833
Child:
1:9e174f8fd9e9
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/BLE_API.lib	Mon Nov 02 18:25:58 2015 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/teams/Bluetooth-Low-Energy/code/BLE_API/#d494ad3e87bd