So you've got your RaspberryPi hooked up to the TV and are loving the set-up but one thing is bugging you, iyou've not hooked it up to your Harmony remote.

What you'd think would be an easy google quickly turns into a dead end, it's strange because wiring up an IR receiver is a doddle and Logitech's Harmony devices can literally imitate any remote control going. What should be as simple as picking any old remote, loading the lirc script to your Pi and adding the device to your Harmony.

simple XBOX360

LG AKB73715601

https://sourceforge.net/p/lirc-remotes/mailman/message/34073175/

from a LG-TV 32LN5758

http://lirc.sourceforge.net/remotes/