Catch bluetooth headset pressed button, translate to keyboard keypress

We need a small C/C++ application running backgrounded without need for any GUI. The application is to do as followed in order: * Catch whenever standard bluetooth headset "answer-button" is pressed and hold down * Emulate a pressed key on keyboard (selected key should be configurable by simple .ini file) * Catch whenever standard bluetooth headset "answer-button" is released. * Release the emulated keypress We use embedded windows 8.1 on our devices, therefore keeping size down is important to us. We have not fully decided what specific headset to use, so if there is any hardware specific requirements as for the selection of headset, let us know.