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In PubSub configuration, how to config the publisher to publish only changes on data values
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Hazel S
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05/26/2021 - 07:10
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Hi, we are trying to limit the publish messages, and hoping the publisher only sends out messages when there’s a change in the dataStore. 

I see there’s a parameter for PublishingInterval in WriterGroupDataType, and the reference (6.2.5.2) mentions “Event based DataSets”. But I’m not sure if that’s the right one to go after, since we still want to publish the data value, not the event.

There’s also another parameter, KeyFrameCount in DataSetWriterDataType, and the reference (6.2.3.3) mentions “For non-cyclic PublishedDataSets, like PublishedEvents, that provide event based DataSets, the value shall be 0″. I’m wondering how to publish delta frame of the dataStore. I tried setting KeyFrameCount to 0, which didn’t change the publisher behavior.

 

Hope someone here can have insight about it. Thank you very much!

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Randy Armstrong
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05/27/2021 - 00:24
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Are you using the preview of the UA PubSub .NET Standard implementation?

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Hazel S
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05/27/2021 - 04:41
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Randy Armstrong said
Are you using the preview of the UA PubSub .NET Standard implementation?

  

Yes, I’m using that one to add some modification

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Randy Armstrong
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05/27/2021 - 08:23
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The preview does not support delta frames.

It is a work in progress.

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Hazel S
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05/27/2021 - 08:30
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Hi Randy, thanks a lot!

Just to confirm, does preview mean this code base, https://github.com/OPCFoundati…..ETStandard

Thanks again.

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Randy Armstrong
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05/27/2021 - 10:03
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Yes, the UAPubSub library is a preview.

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Hazel S
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05/27/2021 - 14:22
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What about event based dataset? Is it also the right way to report value changes? I guess it’s not in the current UA PubSub .Net library, right?

Thank you!

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Randy Armstrong
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05/27/2021 - 16:37
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Does not appear to be there.

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