Investigating Duplicate Data Packets from a Multicast Tracker 🔎

Kapadia

I did it as per you say but it did not make any difference.

gppaille

I meant to put a breakpoint on the psnServer.StartSending() line to see if it’s called multiple times.

Kapadia

It stops at breakpoint only one time. and then after function start reading data.

gppaille

Thanks for the details. Is it possible for you to share a stripped down version of your project to have a minimal reproducible example where the issue happens? That could help identify if there is an issue with the C# implementation of PSN.

Kapadia

Sure, I can share it with you tomorrow.

Kapadia

Good Morning Gilles-Philippe, here is the project link https://github.com/harshkapadia311/Fx5UC-Read.git

gppaille

I cannot access the git repo because because it is private. You can either make it public or temporarily add me as a contributor. My GitHub username is “gppaille-vyv”.

Kapadia

I just change the repo from private to public https://github.com/harshkapadia311/Fx5UC-Read.git

gppaille

Thanks for sharing. I just tried and the only way I managed to get the same behavior that you observe is to press the “START” button multiple times without pressing “STOP” first. I don’t see anything wrong with the code, but adding a condition with psnServer.IsSendingAutomatic before calling StartSending or StopSending would be more robust and would avoid getting exceptions when StopSending is called without calling StartSending.

Kapadia

gppaille as you say I implemented it but still see the duplicate pck in the n/w

gppaille

Unfortunately, at this point I don’t think I can help further since I’m not able to reproduce your issue by any other means than what I mentioned above. I’ll write back if I get an insight on what could be causing this issue.

Kapadia

gppaille gppaille Hi, I tried to solve the issue of duplicate packages. We verified the PLC data, and it provides one value at a time without duplicates from the PLC side. I created another project using the DBDesign.PosiStageDotNet library that sends positional tracker data periodically over multicast using .NET 6+'s PeriodicTimer. This method ensures smooth, ordered sending of tracker data asynchronously without blocking the UI, with appropriate start/stop and cancellation support. Here is the link https://github.com/harshkapadia311/TestPosiStageNet.git. However, in this project too, I still find duplicate packets. I would really appreciate your help with this.

Kapadia

Is there a way to ignore the duplicate packets in the library?

gppaille

Hello Kapadia,

I just tried the new project and I cannot reproduce the issue you observed. All packets are unique when I inspect them in Wireshark. I would suggest to try the application on a different network or computer to make sure it’s not an OS or a switch configuration issue.

Kapadia

gppaille Thank you, I really applicate for this suggestion. May be our router and switches are not configured for Multicast. I keep you posted.

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