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OPC UA Server publishing cycles

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05/08/2024 - 22:38

Hi,

I have developed OPC UA SERVER application using CSharp(C#) language.

I have one requirement: OPC UA server shall send all notifications of value change of a variable between 2 notification publishing cycles

How to implement this?

Randy Armstrong

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05/09/2024 - 01:00

The client has to set a QueueSize = (PublishingInterval/SamplingInterval) +1

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05/20/2024 - 00:25

Where do we need to set PublishingInterval and SamplingInterval? Server or client?

is therse parameters related to client or server?

Randy Armstrong

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05/20/2024 - 07:51

They are parameters passed by the client to the server.

Read up on the Subscription model:

https://reference.opcfoundatio…..ocs/5.12.1

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05/30/2024 - 04:54

I have updated QueueSize for specific variable (PublishingInterval/SamplingInterval) +1 in client side.

PublishingInterval = 500ms

SamplingInterval = 250

So QueueSize = 3.

Now My question is how to validate this requirement?

Randy Armstrong

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05/31/2024 - 00:32

Create an MSTest project and create a client that verifies the behavior.

You could also use the CTT but you would have to review the tests and figure out which one tests the behavior you need.

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