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14:54, EEST
July 22, 2014
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I am working on the following partial code which is trying to display some information about the desired node…
myNode = sampleClient.getNodeFromBrowseString("Objects|@|Computer|ICONICS.SimulatorOPCDA.2_DA|DEP00_SCEx_SWD01x_B02");
System.out.println("Node: "+myNode.toString());
UaNode uNode = sampleClient.getAddressSpace().getNode(myNode);
System.out.println("Browse Name: "+uNode.getBrowseName());
System.out.println("Node Name: "+uNode.getNodeId());
System.out.println("Display Name: "+uNode.getDisplayName());
Where the getNodeFromBrowseString() is a function that returns a NodeId object. As is, the code resolves the NodeId (as far as I can tell because it prints out what appears to be a valid NodeId result) but then generates a:
Exception in thread “main” com.prosysopc.ua.ServiceException: Bad_Timeout (code=0x800A0000, description=”The operation timed out.”) ServiceResult=Bad_Timeout (0x800A0000) “The operation timed out.”
when trying to convert the NodeId into a UaNode. Since I want to display various information about the node (such as BrowsePath, Display Name, Description and attributes), I need to convert the NodeId to a UaNode (as far as I understand) because NodeId does not provide access to this information whereas UaNode does.
In the case of the above code, the provided BrowseString is a path to a Leaf Node (which would have attributes/properties but no further children). When I modify the code slightly to point to a non-Leaf node, such as:
myNode = sampleClient.getNodeFromBrowseString(“Objects|@|Computer|ICONICS.SimulatorOPCDA.2_DA”);
The code runs fine and the conversion from NodeId to UaNode succeeds.
What am I doing wrong? As I said, the NodeId seems to be valid in both cases so I don’t believe it is related to my getNodeFromBrowseString() function.
Note: The server is a DA server which Iconics exposes as a UA compliant OPC server. This is why the same of the server contains DA.
18:57, EEST
July 22, 2014
Offline
Hmm…I wonder if this is something related to the fact that particular OPC Server? I tried the same code with UA Sample Server and it seems to work.
Is it possible that the ICONICS Server isn’t implementing the leaf nodes as UaNodes and thus the conversion is failing?
19:30, EEST
December 21, 2011
Offline
Well, it would help to know what your getNodeFromBrowseString does. But, note that there is a similar service available already in OPC UA and you can use it from UaClient.getAddressSpace().translateBrowsePathToNodeId(). Also note that the browse names are QualifiedName:s and you need to provide the correct NamespaceIndex for each: plain string may not be the correct one, unless the node is in the standard namespace (NamespaceIndex=0).
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