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Messages from .NET OPC UA Client

Vojtěch Osvald

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05/18/2015

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02/17/2016 - 02:31

Hello,

we are using the .NET OPC UA Client and when communicating with OPC Server, many of these messages appear:

Sequence number=2911479 was not received in the available sequence numbers.

(the number changes)

We were wondering, what does this sort of message mean and if it means some error?

Thanks for any info, Vojtech

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Guests

02/18/2016 - 09:45

Hello Vojtech,

you will find the .NET sources on github (https://github.com/OPCFoundation/UA-.NET). When you search for “was not received in the available sequence numbers” you will find the Trace output in “Session.cs”.

It appears to be a Server error where the availableSequenceNumbers field in the Publish response contains a number that is not expected by the Client (maybe already acknowledged).

-Karl

Vojtěch Osvald

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02/19/2016 - 04:24

Hello Karl,

thank you for your response. The server we are using is a Siemens server.

In particular:

SIMATIC NET SOFTNET-IE, S7 Lean, V13

Is this a known issue with this kind of OPC UA server? Or is there some way we are using it wrong?

Thank you, Vojtech

Guest

Guests

02/19/2016 - 05:34

Hello Vojtech,

I am not familiar with this Server. But I also cannot guarantee that the Client is correct – after all, it is only a sample implementation.

Regards,

Karl

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