Auto-use skill/item when network packet arrive

[BloodWist]

I was playing around with WireShark, trying to create some sort of Lua script to execute a command (use a skill or item) when a specific packet arrive at my network card (so I wouldn't need to inject anything into RO client).

I was wondering if anyone out there knows something that can do this without DLL injection (no rPE or WPE, for example).