Related packet symbols in Lua dissector

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For C-based dissectors, track the requests and responses (usually via conversations which I don't know how to do in Lua), and then add fields to the tree to say how the current frame is tied to the other, e.g.

• For the request, add a field indicating the response is in frame x with the field type set to FT_FRAMENUM, and the FRAME_NUM type set to T_FRAMENUM_RESPONSE
• For the response, add a field indicating the request is in frame x with the field type set to FT_FRAMENUM, and the FRAME_NUM type set to T_FRAMENUM_REQUEST

Some details are in README.request_response_tracking.

For Lua, create the ProtoField with type ftypes.FRAMENUM and the value string one of frametype.REQUEST or frametype.RESPONSE, see here for more info on the Protofield options

I haven't tried this, but ProtoField.framenum() is probably a good place to start.