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OPCClient, Subscription, wildcard accepted?
May 5, 2014
9:08, EEST
Forum Posts: 8
Member Since:
March 20, 2014
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I would like to know if it is possible to add a Subscription using wildcard …
Example: [MY_PLC]Global.* in order to get callback for any variables matching the pre-defined ‘pattern’

Thanks a lot,


May 6, 2014
7:06, EEST
Jouni Aro
Forum Posts: 1015
Member Since:
December 21, 2011
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Not directly. But, the Query service is exactly for requesting a set of nodes that match this kind of criteria. You could then subscribe to all of these. Query requires support from the server, though. We have not made it easily available in the SDK, yet, but it is possible to use it, if you need.

July 24, 2014
18:35, EEST
Forum Posts: 19
Member Since:
July 22, 2014
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If you don’t have the necessary server support then, assuming you aren’t going to be changing the subscription frequently, just recurse through the address space and subscribe to the nodes that match the pattern.

Obviously this is not a good solution if you are going to be changing the pattern frequently or if the address space is overly large (since it will take time to explore the address space for matches).

I posted an example of how you can explore the address space recursively in the following post…


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