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18:05, EEST
February 21, 2014
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My UaClient is connected to an OPC UA server, whose addressSpace is changing based on some conditions. While the changes can easily be observed by other UA clients, such as UAExpert after rebrowsing, my client does not pick up the changes after rebrowsing the addressSpace or re-reading the uaNodes. The cache.setNodeMaxAge has been set to “0”.
I used addressSpace.browse calls as well as usNode.getReferences, addressSpace.getNode() etc. All do not pick up the changes. Any suggestion would be much appreciated.
Thanks, HU
9:36, EEST
December 21, 2011
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Sorry, but I cannot think of anything useful, if the server is not providing the data that you expect. The client does not perform any magic that could affect this.
Have you ensured that the server is really providing the correct data for the client. You can turn DEBUG (or even TRACE)-level logging on the SDK to examine the data that it’s providing for the client.
9:38, EEST
December 21, 2011
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Of the methods that you tried, addressSpace.browse always makes the call to the server. getNode() also rereads the complete node, if cache is turned off as you have done. UaNode.getReferences() is never refreshed, so it will not change before the complete node is read again (using getNode()).
10:16, EEST
December 21, 2011
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And the final clarification: the old node that was read with getNode() will not be refreshed, of course, so you need to use the new node object. But I don’t think that you assumed that either, do you?
11:50, EEST
February 21, 2014
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As in most cases, also this one is a “user (aka programmer’s) error”.
As you explained, UaNode. getReferences() does not automatically refresh after an addressSpace change. So when I fell back to browsing “manually” (addressSpace.browse()), I browsed for the wrong NodeClass…. and thus did not see the changes.
UaNode uaNode = …getNode(uaNode.getNodeId()) and a subsequent uaNode.getReferences() also succeeded.
Thanks for your patience.
-HU
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