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  1. Forum
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  5. QuickOPC-UA in .NET
  7. How to diagnose UAEngineException: Timed out waiting session become available

How to diagnose UAEngineException: Timed out waiting session become available

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16 Oct 2023 12:05 #12302 by support
Replied by support on topic How to diagnose UAEngineException: Timed out waiting session become available
Hello,

which QuickOPC version are you using please?
There were fixes made to this area in version 2023.1.

Regards

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16 Oct 2023 09:38 #12301 by boppbo
How to diagnose UAEngineException: Timed out waiting session become available was created by boppbo
I have issues displaying opc status information in a wpf application. I'm subscribing several opc nodes during startup and non-deterministically data loading is slow or the data change callback fails with:

OpcLabs.EasyOpc.UA.Engine.UAEngineException: Timed out waiting (2000 milliseconds) for a session to become available for a conversion.
+ The client method called (or event/callback invoked) was 'DataChangeNotification'.

One thing I'm suspecting might be an issues is that i'm calling read and subscribe methods on EasyUaClient on the threadpool to increase UI responsiveness. Is this supported?
await Task.Run(() => this._client.SubscribeMultipleMonitoredItems(monitoredItems))

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  1. Forum
  3. Discussions
  5. QuickOPC-UA in .NET
  7. How to diagnose UAEngineException: Timed out waiting session become available
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