Performance of Modbus sniffer

[Minza Gayas]

Hi,

I am trying to sniff data of a client which sends requests @660ms rate. Baudrate is 9600 and serial socket timeout is 1s and I am running the Modbus sniffer on rpi CM4 (Linux 11). Using sniffer, I see only half of the requests are processed. For the rest of the requests, framer checker fails or frames are not ready. Is it because client is too fast for the sniffer to process or some timeout needs to be reduced?

[Chris]

Hello @MinzaGayas, I had the same problem and heavily modified @snhobbs code.
If you can look at my fork, it may solve your problems.
The usage is more detailed too...

https://github.com/Ekristoffe/ModbusSniffer

[Minza Gayas]

Hi Chris, Thanks for sharing the link. I downloaded the code but I am still getting the same frame error messages (screenshot attached). Do you have any suggestions about it?

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On Tue, Jun 21, 2022 at 3:00 PM Chris ***@***.***> wrote: Hello @MinzaGayas <https://github.com/MinzaGayas>, I had the same problem and heavily modified @snhobbs <https://github.com/snhobbs> code. If you can look at my fork, it may solve your problems. The usage is more detailed too... — Reply to this email directly, view it on GitHub <#1 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AYZRIX6T7SDJI6H56MS3YBTVQG4GTANCNFSM5ZME5JCQ> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[Chris]

even with the python I wrote you have the same error as the original script ?
that's weird since I don't use the same system anymore and this error isn't in the script.