Exception in MemoryBufferExtension.cs with a Prosys OPCUA Server about libua HOT 16 CLOSED

You are right - it seemed to be to late yesterday. Now it works. Thanks a lot for your fast support.

from libua.

Hello Thomas,

Could you share a Wireshark capture of that call with security mode set to None?

I've also made a small code change, as this looks like a flag but not a data type, please try that.

Thanks,
Nauful

from libua.

Hi, where do I get the code change.

For Wireshark I am not an expert, how to do a fast capture (for beginners?)

Thanks
Thomas

from libua.

Either this repo, or you can update to the latest nuget package I pushed: https://www.nuget.org/packages/nauful-LibUA-core

Let's see if the new nuget package fixes your issue. If not, to capture in wireshark, click Capture -> Start on the menu, connect with security and encryption set to None, reproduce this error, Capture -> Stop on the menu, File -> Save As and upload the capture here. More info: https://www.wireshark.org/docs/wsug_html_chunked/ChCapCapturingSection.html

Thanks,
Nauful

from libua.

I don't see the opcua capture in there, please check that you captured from the correct network adapter (or loopback adapter if localhost). Here's how to check: https://opcconnect.opcfoundation.org/2017/02/analyzing-opc-ua-communications-with-wireshark/

Do you still get an exception in the latest commit? If so, where in the code is that?

Thanks,
Nauful

from libua.

libuacapture.zip

Oh sorry - as mentioned I am not a Wireshark expert. Now everything should be in. The Exception is still at the same location.

from libua.

For the captures, can you tell me what port you connected on?

Also, there's this code change:
dddad72#diff-1ce579e93332054aa094abe3152192bcde0709fc1586b02271917b0d2d6a518f

Can you tell me the value of encodingMask & 0x3F? If encodingMask is 64, that should be 0, and goes to the TwoByte case.

Thanks,
Nauful

from libua.

It is 53530. Will directly check in the code the 64 case....

from libua.

With your change now it throws an exception with encoding Mask 111

from libua.

I don't see any NodeId with a mask of 111/0x6F in the capture, perhaps a new capture?

Can you tell me where the parent is in the call stack? That will tell me what field it's trying to decode here.

from libua.

from libua.

Alright, I may have it now. Please try the latest source or nuget package.

Thanks,
Nauful

from libua.

Thanks a lot but again an exception at the same location but a different call stack:

from libua.

You should be easily able to check this - we are testing with standard Prosys OPCUA Simulation Server:

from libua.

I don't think this is the same issue. I was able to successfully decode your wireshark capture after the previous fix.

This looks like opening a secure channel is failing, which isn't something I've touched recently. Does it work with security set to None?

from libua.

Fantastic!

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