How to receive data via Bluetooth on an Arduino 101?
According to the Arduino Callback LED tutorial, you can use the dedicated library to access the BLE features of the board. All the Curie Libraries are covering the new Arduino/Genuino 101 embedded characteristics .
In your case you must incluse the CurieBLE.h and configure the bluetooth service with Read/Write access.

Have a look to this page for a complete sample.