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  5. QuickOPC-UA in .NET
  7. Reading, Writing, Subscriptions
  9. Multi instance of Client (UA) causing hangs state

Multi instance of Client (UA) causing hangs state

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20 Jul 2023 15:28 #11940 by support
Replied by support on topic Multi instance of Client (UA) causing hangs state
Thank you.
I think I was able to reproduce the problem. Thank you for reporting it!

We have made a fix. Please download & rebuild with the newest version - 5.71.294 (or later), currently on our Web site and on www.nuget.org .

Best regards

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20 Jul 2023 13:23 #11939 by chandresekaran
Replied by chandresekaran on topic Multi instance of Client (UA) causing hangs state
Same OPC Server, I have only one local KepwarEx server running.

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20 Jul 2023 11:59 #11936 by support
Replied by support on topic Multi instance of Client (UA) causing hangs state
Thank you.

One more question please - are the loop iterations connecting all to the same OPC server, or to a different server in each iteration?

Best regards

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19 Jul 2023 16:01 #11933 by chandresekaran
Replied by chandresekaran on topic Multi instance of Client (UA) causing hangs state
It is a single thread that goes on a loop, our use case or implementation might be different.

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19 Jul 2023 10:49 #11932 by support
Replied by support on topic Multi instance of Client (UA) causing hangs state
Hello,

I have a question: Do you create separate threads, or is it just a single thread that goes in the loop?

Also, for completeness in tracking, I am copying here the part of your initial email, because that seems to be a bit more detailed than the forum post:

...I’m testing with multiple instances of client/session, and encountering an issue. We need your support to proceed to evaluate the SDK further, Please read below.

I have written a code that has a loop to create 10 clients/sessions, and each client subscribes for a data event of a separate tag, the first iteration worked fine to subscribe but when the second iteration goes to subscribe function, it goes hangs up and it not even responding an exception nor error code. Earlier this week, I worked on the code from your examples and created a single client that subscribes to multiple tags (I have tried 100 tags) which worked. ...

Best regards

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18 Jul 2023 21:01 #11927 by chandresekaran
Multi instance of Client (UA) causing hangs state was created by chandresekaran
In my application, I create multiple instances of OPC Client and programming to subscribe data change events for different data tags, SubscribeValueChange function causes hangs state, and the function doesn't return any exception nor error code.

If I use one single client instance to subscribe to multiple data tags, it works, but we have a use case to try with multiple instances of clients.

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  1. Forum
  3. Discussions
  5. QuickOPC-UA in .NET
  7. Reading, Writing, Subscriptions
  9. Multi instance of Client (UA) causing hangs state
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