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XML-DA. Subscription is canceled unexpectedly

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18 May 2020 07:10 #8491 by Andriy
Replied by Andriy on topic XML-DA. Subscription is canceled unexpectedly
Hello,

Thank you for your advice. I enabled debug logging and found unsubscribe/subscribe requests that probably caused that issue.

Best regards

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13 May 2020 07:14 #8481 by support
Replied by support on topic XML-DA. Subscription is canceled unexpectedly
Thank you.

Do you call SubscribeItem/SubscribeMultipleItems multiple times, or just once?
If multiple times, is it with the same, or different group parameters (update rate etc.)

Best regards

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11 May 2020 12:24 #8478 by Andriy
Replied by Andriy on topic XML-DA. Subscription is canceled unexpectedly
Hello,

The attached screenshot is a result of "GetStatus" call



Regards
  • GetStatusResult.png

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    10 May 2020 16:54 #8477 by support
    Replied by support on topic XML-DA. Subscription is canceled unexpectedly
    Hello,
    there are many reasons that can cause SubscriptionCancel.

    First thing to find out is what are the results of GetStatus calls, especially between Subscribe and SubscriptionCancel. Can you post those as well?

    Thank you

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    08 May 2020 16:35 #8474 by Andriy
    XML-DA. Subscription is canceled unexpectedly was created by Andriy
    Hi,

    While investigating a communication between my application and Siemens OPC XML-DA Gateway server, I found a lot of subscription cancellation requests. They happen immediately after receiving a response to the subscribe request . The response of the OPC server is very slow. I don't know what is wrong. Could you help me?

    QuickOPC 5.58.151
    Isolated = true
    IsolatedParameters.UseAdvancedPolledRefresh = false

    1. Subscribe request


    2. Subscribe response


    3. Next 2 telegrams are related to "GetStatus" call

    4. Subscription cancel request
  • 2-SubscribeResponse.png
  • 3-SubscriptionCancel.png
  • 1-Subscribe.png

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