You need to put PulsarApi.proto to a separate path.
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Open your Wireshark.
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Go to Edit > Preferences > Protocols > ProtoBuf > Protobuf, and then search paths.
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Add the path of PulsarApi.proto.
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Open Wireshark.
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Go to About Wireshark > Folders > Personal Lua Plugins > Plugin Path.
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Add pulsar.lua to this path.
This plugin registers a Pulsar protocol automatically in 6650. You can use it to decode Pulsar messages now.