MAVLink Lua Dissector not working as expected.

Noshin Sabuwala

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Oct 13, 2022, 7:14:05 AM10/13/22

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Dear Sir,

I have included Lua Script for MAVLink common.xml in wireshark plugins, however it appears as Unparsable Payload in wireshark. I am attaching lua script as wll as the wireshark screenshot. Please help me resolve this and get the display of mavlink payload as appears in https://mavlink.io/en/guide/wireshark.html

Looking forward to your response.

Regards,

Noshin Sabuwala

MAVLink Wireshark Unparsable Payload.PNG

mavlink_2_common.lua

Hamish Willee

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Oct 13, 2022, 6:27:05 PM10/13/22

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Are any of the messages being displayed?

What flight stack are you using? How did you build the lua plugin (what command)

Michael Oborne

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Oct 14, 2022, 12:49:20 AM10/14/22

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just a guess from the screenshot, the udp packet in question is not a mavlink packet.. its some other random network traffic on your virtual machine

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Noshin Sabuwala

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Oct 15, 2022, 2:53:22 AM10/15/22

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Sir,

I have tried lua plugins available on internet and have also created lua script using common.xml file. Every time same output is seen. Attaching my common.xml file with the mail.

common.xml

Noshin Sabuwala

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Oct 15, 2022, 2:55:58 AM10/15/22

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SIr,

In that case may I please ask you to guide me through which port I should be listening to for mavlink communications. I am attaching a capture depicting all open ports. Softwares I am using:

Ardupilot for autopilot

QGroundControl as GCS

Gazebo simulator.

Ports.PNG

Hamish Willee

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Oct 19, 2022, 4:46:42 AM10/19/22

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I don't use ubuntu but it looks like the only port with data is gzserver - which presumably might not be getting any mavlink traffic?
Do you ever see data on the other ports? YOu want to look at the same port as QGC does on ardupilot - which I expect is 14550

But no point if you aren't getting any data between ardupilot and QGC on that port.

Hamish Willee

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Oct 19, 2022, 6:02:05 PM10/19/22

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Maybe helpful, see this video of intercepting traffic using Wireshark between WSL and QGC on Windows https://youtu.be/qfDGdgIAU5g?t=1525 - the point I'm trying to show is that you can see when data is flowing on the interface here, and you should also see it from QGC connecting and getting information.

Noshin Sabuwala

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Dec 19, 2022, 3:23:40 AM12/19/22

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Sir,

Kindly send screenshot of wireshark showing how does a mavlink packet look.

Thanks and Regards.

Hamish Willee

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Dec 20, 2022, 5:56:37 PM12/20/22

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From https://mavlink.io/en/guide/wireshark.html#view-traffic-on-wireshark

There is an image showing the mavlink traffic here: https://mavlink.io/assets/wireshark/live_output_all.jpg

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