A port of the nRF UART android App into Android Studio 1.0.1. The orignal nRF UART source code was obtained from https://developer.mbed.org/forum/wiki-16691-forum/topic/5134/
This App implements a simple text based send and receive service.
To test this code with the nRF51822 mbed KIT you need to run BLE_LoopackUART which is available http://developer.mbed.org/teams/Bluetooth-Low-Energy/code/BLE_LoopbackUART/
I have also created a version of this code that lets you switch LED2 on and off over BLE http://developer.mbed.org/teams/UCL-IoT/code/BLE_UART_LEDControl_Echo/