Error monitoring

[franklupo]

Hi,
i connect client to Siemens plc.
When read the statuscode is null but value and timestamps are ok.
When create monitoring receive status BadEncodingLimits Exceeded

what am I doing wrong?

Best regards

[nauful]

Hello,

Can you share a Wireshark capture with no security?

[franklupo]

i don't know how to do with Wireshark

[nauful]

https://help.salesforce.com/s/articleView?id=000385344&language=en_US&type=1

Otherwise you might be monitoring too many items in a single call. Try batches of a few items at once.

[franklupo]

opcua.zip

[franklupo]

Hi,
I don't know if it helps but with this library it works
https://github.com/convertersystems/opc-ua-client

best regards

[nauful]

Looks like a PublishResponse is too large for the sender/receiver according to the initial configuration. I need to see a capture with no security, this connection is secured with encryption so I cannot read the messages.

[franklupo]

opcua2.zip

[nauful]

Still encrypted:

You have to debug through this since I can monitor items with all of the test servers I have access to. If you can share an unencrypted capture I can try to help. Otherwise I can't find an issue.

[franklupo]

encryption where should I disable?

[nauful]

LibUA/NET Core/TestClient/Program.cs

Line 120 in 7e14450

var messageSecurityMode = MessageSecurityMode.SignAndEncrypt;

Change SignAndEncrypt to Sign.

[franklupo]

Is None

[nauful]

Check in Wireshark that you can see the contents of the PublishRequest message. It should show a full disassembly of the body if not encrypted. Otherwise only the headers are visible.

Example of a full body:

[franklupo]

var messageSecurityMode = MessageSecurityMode.None;
var securityPolicy = SecurityPolicy.None;

[franklupo]

i'm using the port 4841 and wireshark is set 4840. I changed the port to 4841
try now

opcua3.zip

[nauful]

I can see the contents now. Not sure why it fails, the server publishes 0 notifications, the client sends another request and the server fails with BadUnexpectedError.

The only issue I can think of might be this:

Perhaps request a publishing interval of 5 seconds (5000).

[franklupo]

Reopen issue please

[nauful]

I can try to assist you with library usage but I prefer to keep issues for problems with the library itself. Please try my suggestions above and let me know if that works.

[franklupo]

The problem is the parameter filter in MonitoringParameters,
if present response Goof is null return BadEncodingLimitsExceeded
IF presente the notification not work.

[nauful]

Thanks, will note that if I see this issue again.