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Server doesn't seem to respect client's minimumSamplingInterval
February 15, 2016
15:59, EET
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hbrackel
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Hi,

according to the specification, a server shall not send data changes with a higher update rate than requested by the client with the minimumSamplingInterval. The Server SDK doesn’t seem to respect this. Updates are sent always at the highest update rate.

Inside the my server, the variables are either updated by using the UaVariableOfSomeKind.setValue() method or by using notifyDataChange() on a monitoredItem. NotifyDataChange() should still engage the dataChangeFilter mechanism, I think.

Can the above behavior be corrected by overwriting the defaults using any of the available handlers?

PS: the publishingInterval of the subscription in the above scenarios is shorter than the requested samplingInterval

Thanks,
Hans-Uwe

February 16, 2016
7:38, EET
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Jouni Aro
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Yes, this is a current limitation of the SDK: it does not support SamplingInterval longer than PublishingInterval for monitored items.

We will address this soon.

February 18, 2016
10:31, EET
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Bjarne Boström
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Will do after 2.2.2 release is done. It seems implementing this may take some time/changes on how the data changes are notified to the Subscription from MonitoredDataItems.

Probably the easiest way to get this working until a fix is made is to limit the data values sent to .setValue or notifiyDataChange to the samplinginterval in the application specific code.

– Bjarne

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