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Problem resolved: 1. There's a bug in the mavlink.lua dissector that causes it to fail, due to the unknownFrameBeginOffset variable not being initialised. Just add "unknownFrameBeginOffset=0" to the start of the script to fix it. 2. The script is written to sniff for MAVLINK over UDP, whereas I am using it to sniff MAVLINK over TCP. Hence I changed the reference to "UDP_DISSECTOR" to read:

local tcp_dissector_table = DissectorTable.get("tcp.port") tcp_dissector_table:add(14550, mavlink_proto)

Problem resolved: 1. There's a bug in the mavlink.lua dissector LUA script that causes it to fail, due to the unknownFrameBeginOffset variable not being initialised. Just add "unknownFrameBeginOffset=0" to the start of the script to fix it. which I have fixed. 2. The script is written to sniff for MAVLINK traffic over UDP, whereas I am using it to sniff MAVLINK over TCP. Hence I changed the reference script to "UDP_DISSECTOR" to read:reflect that.