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S7NetPlus / s7netplus

S7.NET+ -- A .NET library to connect to Siemens Step7 devices
MIT License
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Request: Flush/Reset TCP Buffers #421

Closed droessler-robotron closed 2 years ago

droessler-robotron commented 2 years ago

Thanks for providing this lib and code! We are using this lib for a while and reading data form a real Siemens S7 PLC on different load situations...

After periodically reading some data from fixed addresses for 2..3 days in fixed interval of about 1..3 seconds there is a known issue:

S7.Net.PlcException:“Received 15 bytes: '32-03-00-00-00-07-00-02-00-01-00-00-05-01-FF', expected 19 bytes.” like here https://github.com/S7NetPlus/s7netplus/issues/384 described.

And this, once occured, will not restore back to a state as before. This exception will now happen on and on. I am not really sure if it fails with every loop, but as far as i see it stays until i force a new connection manually.

I'd like to handle this Issue well and wonder if there is a possibility to flush (clear) the stream buffers from the TCP Connection??

By the way ... will this exception only occures when there are bytes missing or also when there are more bytes than expected ?

have a nice weekend! regards Tobias

scamille commented 2 years ago

Which version of S7NetPlus are you using?

droessler-robotron commented 2 years ago

oh yes, sorry. It's version "0.8.1"

scamille commented 2 years ago

The reason is that at some point I did something to properly reset the connection on those errors in #349

Please try again with 0.13.0

droessler-robotron commented 2 years ago

We upgaded to 0.13.0 and for the first there was no further error... we observe it for long time stability.

Thank you very much and I think we close this issue.