Investigating Duplicate Data Packets from a Multicast Tracker 🔎

Kapadia

I checked my code its called psnServer.StartSending() only one time.

gppaille

Have you tried with a breakpoint or a trace? I’m insisting on this potential path because after my tests and seeing the Wireshark capture you got, the symptoms are the same and it’s really pointing to “StartSending” being called twice. Even if there is only one calling site in the code, the surrounding code might be called multiple times. It’s especially true with forms in C# when previous instances of a form are not completely disposed of and leaves ghost instances.

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.