lua decoder accessing info from layers above

[Fulko Hew <fulko.hew () gmail com>]

I'm trying to update/improve someone else's decoder written in Lua.
It's for a simple UDP (and TCP) based protocol.
But I need to be able to get access to the upper layer
to be able to decode it easily.

Can someone provide an example of how to determine if the higher layer was
UDP or TCP?

Thanks
Fulko

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