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Client Subscription Default Value
February 13, 2017
21:35, EET
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databaseerror
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February 2, 2017
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When a client who was subscribed to various tags reconnects to Kepware OPC server the default value for the tag type is returned rather than the actual value. Is there any settings to ensure Kepware OPC server will return the actual value of the tag rather than a default value?

February 14, 2017
12:04, EET
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Heikki Tahvanainen
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Hi,

I’m not sure if I understood correctly. Do you mean that after the client reconnects, it receives notifications from the server but those notifications contain wrong value? Do you have some more detailed example about what happens and what should happen? Does the same error happen with other client applications?

With normal OPC UA subscriptions, the server will only report value changes to the client. So, if no values have changed during the connection break, the server will not report any notifications. If you suspect that data is missed for the subscription during a communication problem, you can call Subscription.readAll method. But as said, in the normal case this shouldn’t be needed.

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