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11:21, EET
October 21, 2014
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Are the attribute ID’s for nodes (e.g. no 13 for Value attribute etc) fixed by OPC spec or they are server implementation dependent?
12:09, EET
Moderators
April 17, 2013
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Hi,
The attribute IDs are fixed in the OPC UA specification. For complete list, see specification part 6, version 1.03, page 51. You can download the specifications from https://opcfoundation.org/developer-tools/specifications-unified-architecture
16:23, EET
October 21, 2014
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How to check if a string “s” is valid NodeId or not? Is the code “NodeId.parseNodeId(s)!= null” OK for checking it? As I don’t know what parseNode returns (no documentation for this method).
7:37, EET
April 3, 2012
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That class is part of the STACK, not SDK. Javadoc for the STACK is included in non-eval versions.
10:05, EET
October 21, 2014
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But how to check if a string “s” is valid NodeId or not? Is the code “NodeId.parseNodeId(s)!= null” OK for checking it?
regards
PRAMANJ
10:43, EET
April 3, 2012
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The NodeId.parseNodeId will throw IllegalArgumentException if it cannot parse the string. So does NodeId’s constructors if given values are out of range (based on the specification Part 3, section 8.2.4.)
– Bjarne
10:53, EET
October 21, 2014
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Dear Sir,
Its doesn’t give illegalArgumentException but it gives com.prosysopc.ua.StatusException ! Its serving my purpose as I am able to catch any exception and proceed, but is it OK as per the spec to get StatusException rather than illegalArgumentException ?
regards
PRAMANJ
7:39, EET
Moderators
April 17, 2013
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Hi,
Are you getting this exception from NodeId.parseNodeId method? Probably the exception is being thrown from some other method, where you use the NodeId that you made with NodeId.parseNodeId.
You can make any NodeId object that you like with the method NodeId.parseNodeId as long as the method can parse the string. This will not check whether or not the NodeId exist in the server.
You can check that the Node exists in the server for example by making a read request. Reading attribute with client.readAttribute(new NodeId(0, “n”), Attributes.NodeClass) will result in StatusException being thrown with StatusCode Bad_NodeIdUnknown.
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