Lua script for logitech gaming software to emulate F21 exclusively on the M3 profile

Logitech G3 as F21 only on M3.lua

--Purpose: Rebind Logitech g3 on the M3 keyboard profile (of the current LGS profile) to F21.
--I use this key to toggle shadowplay recording without leaving triggers prone somewhere on my regular keyboard keys.
--Shadowplay is stupid and normally demands modifier keys but not for F keys.

--To use it, go in Logitech Gaming Software and right click your keyboard profile (the gear at the top) and edit script.
--Paste this in, save it and close.
--This executes in addition to whatever you bind on that key, so I reccommend leaving G3 on M3 blank!

--Read all about it at: C:/Program Files/Logitech Gaming Software/Resources/doc/G-seriesLuaAPI.pdf
--Or https://gist.github.com/Thespikedballofdoom/569c3516ad83b008d4204ba7140b9751

keymap = {
--  [1]="f13",
--  [2]="f14",
  [3]="f21",
--  [4]="f16",
--  [5]="f17",
--  [6]="f18",
}

function OnEvent(event, gkey, family)
  mkey = GetMKeyState()
  if mkey == 3 then
    key = keymap[gkey]
    if event == "G_PRESSED" then
      PressKey(key)
    end
    if event == "G_RELEASED" then
      ReleaseKey(key)
    end
  end
end