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ConditionRefresh

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14 May 2021 15:28 - 14 May 2021 15:49 #9682 by support
Replied by support on topic ConditionRefresh
Hello.

I do not see doing that as any disadvantage, quite the opposite. You will end up having the data closer to where they are consumed, and your REST client will get them *much* faster compared to a ConditionRefresh from the server.

QuickOPC has certain design ideas baked into itself, and in some areas, it provides higher level API than just what is OPC UA specs.

If this design does not fit your usage, you'd be better off using a different library (but I do not think this is the case with what you have described). Trying to get around the design is highly discouraged and it is possible that it won't even work. For example, you could try to extract subscription Ids from SubscriptionDiagnosticsArray variable in the server, but you may run into problems like a) permissions, b) whether the server supports it or not, c) how to map the subscription Ids to the monitored items/event subscriptions in QuickOPC, d) whether the event from the manually invoked ConditionRefresh will actually be correctly delivered by QuickOPC to you - because QuickOPC does not know about this additional ConditionRefresh - and those are just the issues that came to my mind first.

Best regards
Last edit: 14 May 2021 15:49 by support.

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14 May 2021 13:44 #9681 by AdiROC
Replied by AdiROC on topic ConditionRefresh
Thank you for your fast replies!

This was my emegency plan ;)

Is there no easier way for example by reading all subscription ID's from the server and update them all?

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14 May 2021 10:43 #9679 by support
Replied by support on topic ConditionRefresh
Hello.

The fact that you ConditionRefresh "hidden" from you in QuickOPC is by design and is not going to change.
In your case your code should keep the data from incoming event notifications in memory. If the REST client needs all data, you can provide them from what you have stored.

Best regards

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14 May 2021 09:59 #9678 by AdiROC
Replied by AdiROC on topic ConditionRefresh
Hello

Thank you for your answer.

In my case this wont work, because my OPC UA Client is like a gatway.
The other side from the gatway (REST Webservice) needs to be synchronized, for example after a restart.

Could you provide me with a update?

Or is ther a possibility to fire a RefreshRequiredEventType from the OPC UA client side?

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14 May 2021 04:26 #9677 by support
Replied by support on topic ConditionRefresh
Hello.

In QuickOPC, you cannot get the subscription ID. The ConditionRefresh is called and handled automatically, internally by QuickOPC. For all event subscriptions you make with UAMonitoredItemArguments.AutoConditionRefresh == true, which is the default, QuickOPC will call refresh upon connections and reconnections, and also when the server indicates that the refresh is necessary, using a RefreshRequiredEventType event. To my knowledge, there are no other cases in which ConditionRefresh needs to be called.

QuickOPC also distinguishes, in the event notifications, which notifications belong to the ConditionRefresh and which represent "normal" events.

Best regards
The following user(s) said Thank You: AdiROC

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13 May 2021 21:26 #9675 by AdiROC
ConditionRefresh was created by AdiROC
Hello

I am programming a .NET Framework OPC UA Alarms & Conditions Client. So far so good. :)

The problem I am facing is that I need to provide a refresh functionality.

For that purpose I use the method "ConditionRefresh" in the Namespace " opcfoundation.org/UA/ ".
I can call the method by the provided example "CallMethod".

To call this method I need to pass a SubscriptionId. This also works fine, but I need to try out for the IDs...

My question now is where can I get the ID to pass?
Or is there a specialized client object to refresh?

Here is my code:

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