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01/27/2016
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….
m_Subscription = new Subscription(session);
m_Subscription.PublishingEnabled = true;
m_Subscription.PublishingInterval = publishingInterval;
m_Subscription.DataChanged += SubscriptionOnDataChanged;
m_Subscription.NewEvents += SubscriptionOnNewEvents;
m_Subscription.StatusChanged += SubscriptionOnStatusChanged;
m_Subscription.Lifetime = 10000;
m_Subscription.MaxKeepAliveTime = 10000;
m_Subscription.Create();
With the above code, I lost subscription time to time meaning SubscriptionOnDataChanged is not called. I was reading the document and that says “The requested Lifetime may be overridden by the Server. Clients must check the CurrentLifetime property after creating or modifying a Subscription to see the value that the Server will actually use.”
What does it mean for C# client? Can any body show or explain me?
05/30/2017
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Lifetime only comes into play if the client stops sending publish requests. If there have been no publish requests after the Lifetime elapses the Subscription is closed by the server. If you are getting some publish responses then that is not the issue.
01/27/2016
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Thank you for reply,
Say we have a working session and subscription, how does client stop sending publish request? I have a C# unified automation client, I see that happens but not sure how my client is making request to stop it, I don’t see any related code there.
05/30/2017
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It won’t happen if you are using an SDK.
How do you know you are missing updates in the client?
Are you sure the server is sending the update?
Note that processing lag will result in periodic missed updates if PublishingInterval == SamplingInterval.
01/27/2016
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I can see with Debugger in the C# client and the subscription method is not called.
I can set value by UAExpert and that works OK, so problem is in my client side. This is not processing lag.
My question how can I use the existing connection and tell server that server should publish data for client.
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