Linux Bluetooth Remote Control is a freeware application for Java capable mobile devices that allows you to control a Linux based computer from your mobile phone through Bluetooth. The download consists of two components- one for the mobile client and one for the Linux computer.

“The J2ME Part does two things: Scan for an device, where our Service is running
and then just send keycodes from the device with additional info, whether the
key was pressed or released.

The Server part receives these keycodes and according to a config file
(profiles.conf) maps these to keystrokes, mouse movement, mousewheel movement
or mousebutton clicks.”

Visit the project website for more details.