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opc ua connection to http://open62541.org/
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TOPIC: opc ua connection to http://open62541.org/

opc ua connection to http://open62541.org/ 9 years 6 months ago #197

  • fatkhrus
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Hello Franz,
Supporters of Open62541 have written to me six months ago and send me OPC UA server written on their code. We've solved the problem together and according their messages: github.com/open62541/open62541/pull/707#issuecomment-233645668 TeslaSCADA works with their server based on their C stack. As I remember the problem was that our OPC UA client demand not NULL server certificate. According messages in the forum: github.com/open62541/open62541/issues/689. the users also can possibility to connect to their server by using TeslaSCADA products.

Best regards,
Ruslan
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opc ua connection to http://open62541.org/ 9 years 6 months ago #198

  • jpfr
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Hello Ruslan,

Julius from the open62541 project here.
The issue is different from the NULL server certificate.

The current Tesla Scada implementations sends CloseSecureChannel messages with the wrong message prefix (MSG instead of CLO).
This is not conform to the OPC UA specification. Please take a look at the screenshot frax22 attached to his last post to see this in action.
I attached a wireshark capture with more details to this post.

We would like to support Tesla Scada. But we feel that the fix should happen on your side.
Do not hesitate to ask if you have further questions.

Best regards,
Julius
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opc ua connection to http://open62541.org/ 9 years 6 months ago #199

  • fatkhrus
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Hello Julius,

OK. We'll take a look, but it's strange because last time when we've tested with server based on your stack all worked.
It will be very helpful if you send server based on your stack.

Best regards,
Ruslan
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opc ua connection to http://open62541.org/ 9 years 6 months ago #200

  • jpfr
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You can download a binary distribution for the major operating systems on our homepage.
There's a static server executable in the zip.
open62541.org/

Best regards,
Julius
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opc ua connection to http://open62541.org/ 9 years 6 months ago #201

  • fatkhrus
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We've found problems. You were right your server didn't answer to our CloseSecureMessage (our client sent MSG instead of CLO). Also your server sending NULL in ServerCertificate field and our client doesn't connect to your server in this reason. In our new version we'll fix these problems. We'll release next version (2.10) next week with fixed these problems.

Best regards,
Ruslan
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opc ua connection to http://open62541.org/ 9 years 6 months ago #202

  • jpfr
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Great. We will make sure to have you in a list of compatible software

Best regards
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