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You probably misunderstood the meaning of the proto_reg_handoff function. It is called after the individual dissectors have registered themselves, so that the relations between the dissectors can be established. So what you do here is say, he other dissector, if you find your packet refers to this identifier I can handle that. For example the UDP dissector has a table called "udp.port" where you can register to if your dissector handles UDP payloads on a certain UDP port. So the call in your handoff function would be for instance dissector_add_uint("udp.port", 6789, my_dissector_handle). Now, can you predict what the first parameter in your dissector_add_uint() should be?
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