This previously listed, Teensy based project, now includes macro recording and playback facilities.
It utilizes a blue-tooth module for wireless connection. Get the free/no ads Commander Macro Player app and turn any Android device into a universal, programmable remote control for any kind of computer/OS.
Full build instructions and the sketch are freely available here-
More info on the Commander Macro Player app is available here:-
There is also the Engineers Buddy kbd/mouse/macro recorder app available which provides keyboard, US/UK layout, and track-pad functions. For engineers who are required to attend with their own usb keyboard it is an excellent little tool. It is also the best way to record macros for the Commander Player. More info is available here:-