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- QuickOPC-UA in .NET
- Discovery, Browsing, Browse Dialogs and Controls
- Cannot browse particular ObjectFolder
Cannot browse particular ObjectFolder
25 Mar 2024 04:34 #12681
by asenti
Replied by asenti on topic Cannot browse particular ObjectFolder
That has pointed me in the right direction and makes sense regarding the reference types.
I had originally tried adjusting the method to BrowseObjects to see if I could see the c# node under the BrowseProvider node which is an Object Class. Although it appears that the Object has neither of those reference types you had mentioned, which explains why it couldn't see it. I have added in the HasChild reference type to the Browse method and it is now working expected.
Thanks very much for your help.
I had originally tried adjusting the method to BrowseObjects to see if I could see the c# node under the BrowseProvider node which is an Object Class. Although it appears that the Object has neither of those reference types you had mentioned, which explains why it couldn't see it. I have added in the HasChild reference type to the Browse method and it is now working expected.
Thanks very much for your help.
The following user(s) said Thank You: support
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22 Mar 2024 12:32 #12671
by support
Replied by support on topic Cannot browse particular ObjectFolder
Hello.
The example you borrowed is for browsing "data nodes", not "any nodes". The BrowseDataNodes method, used in this example, is intentionally restricted to only return some child nodes. Specifically, it only follows Organizes (35), HasComponent (47) and HasProperty (46) references, and it only returns node with Object or Variable class. The purpose of this method is to browse the structure of objects/variables/properties that are used for generic data operations (read/write/subscribe to changes).
The full OPC UA Information model contains references of other types, and nodes of other classes. You can use the BrowseNodes method and specify precisely what you are interested in. Or, you can pass it parameters such as that BrowseNodes would truly return everything. In effect, you will use the code structure you already have, but replace the method by borrowing from the following example:
opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Late...0all%20kinds%20of%20nodes.html
Beware that OPC UA address space is not a tree. It is a full mesh. When navigating in this unrestricted way, you may encounter cycles, and unless other limitations are put into place (e.g. depth of search, or check for recursion), you may end up browsing indefinitely.
I hope this helps
The example you borrowed is for browsing "data nodes", not "any nodes". The BrowseDataNodes method, used in this example, is intentionally restricted to only return some child nodes. Specifically, it only follows Organizes (35), HasComponent (47) and HasProperty (46) references, and it only returns node with Object or Variable class. The purpose of this method is to browse the structure of objects/variables/properties that are used for generic data operations (read/write/subscribe to changes).
The full OPC UA Information model contains references of other types, and nodes of other classes. You can use the BrowseNodes method and specify precisely what you are interested in. Or, you can pass it parameters such as that BrowseNodes would truly return everything. In effect, you will use the code structure you already have, but replace the method by borrowing from the following example:
opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Late...0all%20kinds%20of%20nodes.html
Beware that OPC UA address space is not a tree. It is a full mesh. When navigating in this unrestricted way, you may encounter cycles, and unless other limitations are put into place (e.g. depth of search, or check for recursion), you may end up browsing indefinitely.
I hope this helps
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22 Mar 2024 00:58 #12670
by asenti
Replied by asenti on topic Cannot browse particular ObjectFolder
Sure, find below the method I am currently using:
private static void BrowseFromNode(EasyUAClient client, UAEndpointDescriptor endpointDescriptor, UANodeDescriptor parentNodeDescriptor, int level)
{
Debug.Assert(!(client is null));
Debug.Assert(!(endpointDescriptor is null));
Debug.Assert(!(parentNodeDescriptor is null));
UANodeElementCollection nodeElementCollection = client.BrowseDataNodes(endpointDescriptor, parentNodeDescriptor);
foreach (UANodeElement nodeElement in nodeElementCollection)
{
Console.ForegroundColor = ConsoleColor.Red;
Console.WriteLine(parentNodeDescriptor);
Console.ResetColor();
NodeCounter++;
Debug.Assert(!(nodeElement is null));
WriteToExcel(nodeElement.NodeId.ToString(), nodeElement.BrowsePath.ToString());
Console.WriteLine(nodeElement.TypeDefinition);
Console.WriteLine(nodeElement + "-----" + nodeElement.NodeId);
BrowseFromNode(client, endpointDescriptor, nodeElement, level + 1);
}
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21 Mar 2024 21:48 #12669
by support
Replied by support on topic Cannot browse particular ObjectFolder
Hello.
I have received your WireShark captures by email, thank you.
You have only captured the outgoing packets (one direction), so I can see the BrowseRequest, but not the BrowseResponse.
But do not repeat the capture, it appears that I might be able to work with this already.
The parameters passed to BrowseRequest are different from MatrikonOPC. I wanted to check your code, but only then noticed that the link you provided (see your original post) is wrong - it refers to an example for OPC DA. It cannot be the code you are using. Please provide the actual code you are using (or link).
Best regards
I have received your WireShark captures by email, thank you.
You have only captured the outgoing packets (one direction), so I can see the BrowseRequest, but not the BrowseResponse.
But do not repeat the capture, it appears that I might be able to work with this already.
The parameters passed to BrowseRequest are different from MatrikonOPC. I wanted to check your code, but only then noticed that the link you provided (see your original post) is wrong - it refers to an example for OPC DA. It cannot be the code you are using. Please provide the actual code you are using (or link).
Best regards
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21 Mar 2024 11:51 #12666
by support
Replied by support on topic Cannot browse particular ObjectFolder
Hello,
if the files are, after zipping, reasonable size (say to 20 MB), please email them to support09 (at) opclabs.com (which will go to myself).
Otherwise, use some service like DropBox, and email us the link.
Best regards
if the files are, after zipping, reasonable size (say to 20 MB), please email them to support09 (at) opclabs.com (which will go to myself).
Otherwise, use some service like DropBox, and email us the link.
Best regards
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21 Mar 2024 02:50 #12665
by asenti
Replied by asenti on topic Cannot browse particular ObjectFolder
Hi Support,
Is a way to share the PCAP's outside of the public forum? I prefer to send these directly rather than publishing them here.
Is a way to share the PCAP's outside of the public forum? I prefer to send these directly rather than publishing them here.
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20 Mar 2024 21:10 #12664
by asenti
Replied by asenti on topic Cannot browse particular ObjectFolder
You a correct that 1 & 2 are probably not going to be an option in this case. But WireShark should work. I’ll get this done in the next 24hrs.
Thanks for your assistance.
Thanks for your assistance.
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20 Mar 2024 20:58 - 20 Mar 2024 20:58 #12663
by support
Replied by support on topic Cannot browse particular ObjectFolder
Hello.
If you could either 1) provide us with the server+configuration, or 2) expose your server endpoint on the Internet (with firewall open only for a specific source IP address of ours), we could troubleshoot the problem ourselves.
Assuming that you cannot either 1) or 2), which usually is the case, next option is to obtain WireShark traces of the communication (both the case from the client that works, and from the client that does not work), and send them to us for analysis. Information to this is here: kb.opclabs.com/Collecting_information_for_troubleshooting (the other pieces of info mentioned in the article are not actually needed in this case; just follow the WireShark-related links under Learning Material).
Can you do that?
Best regards
If you could either 1) provide us with the server+configuration, or 2) expose your server endpoint on the Internet (with firewall open only for a specific source IP address of ours), we could troubleshoot the problem ourselves.
Assuming that you cannot either 1) or 2), which usually is the case, next option is to obtain WireShark traces of the communication (both the case from the client that works, and from the client that does not work), and send them to us for analysis. Information to this is here: kb.opclabs.com/Collecting_information_for_troubleshooting (the other pieces of info mentioned in the article are not actually needed in this case; just follow the WireShark-related links under Learning Material).
Can you do that?
Best regards
Last edit: 20 Mar 2024 20:58 by support.
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20 Mar 2024 20:43 #12662
by asenti
Replied by asenti on topic Cannot browse particular ObjectFolder
Thanks for the response.
1. Correct. I cannot see ns=3;s=0:#c1 at all in the output.
2. When I explicitly select ns=3;s=0:#c1 there is no error, but also no output in the console. Likewise if I select s=BrowseProvider it doesn’t see ns=3;s=0:#c1 underneath it.
1. Correct. I cannot see ns=3;s=0:#c1 at all in the output.
2. When I explicitly select ns=3;s=0:#c1 there is no error, but also no output in the console. Likewise if I select s=BrowseProvider it doesn’t see ns=3;s=0:#c1 underneath it.
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20 Mar 2024 13:57 #12660
by support
Replied by support on topic Cannot browse particular ObjectFolder
Hello.
Are you saying that
1) when you browse s=BrowseProvider, you do not get ns=3;s=0:#c1 in the results?
2) when you browse s=BrowseProvider, you get ns=3;s=0:#c1, BUT when you explicitly browse ns=3;s=0:#c1, you get no error, but also no children?
Regards
Are you saying that
1) when you browse s=BrowseProvider, you do not get ns=3;s=0:#c1 in the results?
2) when you browse s=BrowseProvider, you get ns=3;s=0:#c1, BUT when you explicitly browse ns=3;s=0:#c1, you get no error, but also no children?
Regards
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