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Subscription Performance
February 11, 2015
9:05, EEST
Vienna, Austria
Forum Posts: 20
Member Since:
April 9, 2013
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Hi, I just tested your new released OPC UA Client.
It works well with my OPC UA Server.
Just a bit concerned about performance when monitoring “a lot” of monitoredItems.
For doing so your Client requires first to Read the NodeId multiple time for multiple property and also Browse multiple.
I counted almost 17 Read or Browse for 1 CreateMonitoredITems.
Maybe will be interressant to Read and Browse with one Request for all the NodeId or 10,20,50 per cents. It will be much more efficient.


March 12, 2015
12:02, EEST
Jouni Aro
Forum Posts: 846
Member Since:
December 21, 2011
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Sorry for the delayed answer. Just noticed that the server was keeping messages waiting for moderation, but had not notified anyone about that.

Yes, the reason for these extra calls is actually the usage of the SDK feature, AddressSpace.getNode(), which is used to fetch all meta information related to each node.

Will see if we can optimise that somehow in a future SDK.

February 15, 2016
10:21, EEST
Forum Posts: 86
Member Since:
October 21, 2014
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But CreatMonitoredItems will be a one time activity right? Even if its inefficient, reliability is more improtant than efficiency in my opinion.

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