the author of this app says:
The Open Source Android Scroll Pad
An open source virtual mouse wheel (scroll pad) for your Linux Computer.
Using Bluetooth your phone can be used to scroll on your Desktop/Laptop.
Head over to our technical blog for instructions and the source code for the Linux side.
The source code demonstrates how to use Bluetooth and the Linux uinput system to emulate mouse movement or key presses.
*This tool only works with Linux (tested on Ubuntu)*
*The tool is open source (GPL) and you are required to compile the Linux source code*
Thanks for your support :)