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UA Authentication

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escarre
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17 Jun 2021 13:10 #9779 by escarre

Replied by escarre on topic UA Authentication

Hello,

Of course.

Code to send User and Password, acceptint de certificate:

EasyUAClientConfiguration := TEasyUAClientConfiguration.Create(nil);
    UserIdentity := TUserIdentity.Create(nil);
    try
      UserIdentity.UserNameTokenInfo.UserName := ParamStr2;
      Useridentity.UserNameTokenInfo.Password := ParamStr3;
      EasyUAClientConfiguration.AdaptableParameters.SessionParameters.UserIdentity := Useridentity.DefaultInterface;
      EasyUAClientConfiguration.RemoteMachineName := ParamStr1;
      EasyUAClientConfiguration.AdaptableParameters.SessionParameters.EndpointSelectionPolicy.AllowedMessageSecurityModes := UAMessageSecurityModes_All;
      EasyUAClientConfiguration.SharedParameters.EngineParameters.CertificateAcceptancePolicy.AcceptAnyCertificate := True;
      EasyUAClientConfiguration.Connect;
    finally
      UserIdentity.Free;
      EasyUAClientConfiguration.Free;
    end;

For each value I need to read:

ReadArgument := CoUAReadArguments.Create;
        ReadArgument.EndpointDescriptor.UrlString := strOPCServer;
        ReadArgument.NodeDescriptor.NodeId.ExpandedText := NodeId + OPCItem;
        ReadArgument.AttributeId := UAAttributeId_DataType;

The code to Read the items:

TVarData(Results).VType := varArray or varVariant;
  TVarData(Results).VArray := PVarArray(ClienteOPCUA.ReadMultipleValues(PSafeArray(TVarData(Arguments).VArray)));
  for intVariable := VarArrayLowBound(Results, 1) to VarArrayHighBound(Results, 1) do
  begin
    Result := IInterface(Results[intVariable]) as _ValueResult;
    if VarIsEmpty(Result.Value) then
      SaveError('Value.Value: ' + strIdVariableEscribir + ' - ' + ID_NO_EXISTE)
    else
    begin
      SaveValue(strIdVariableEscribir , Result.Value);
    end;
  end;

Thanks for you help!
Escarre

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support
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17 Jun 2021 12:52 #9778 by support

Replied by support on topic UA Authentication

OK, that was a quick sequence of posts, and I was not present. I am glad you got it working. I suggest that you post here what were the causes of your problems, so that other users can learn from it.

The proper and secure way to get rid of the certificate validation dialog is to copy the server's certificate to the "trusted peers" certificate store. More information: opclabs.doc-that.com/files/onlinedocs/QuickOpc/Latest/User%2...%20Instance%20Certificate.html .

Most likely this means you should inspect the certificates you have under "C:\ProgramData\OPC Foundation\CertificateStores\RejectedCertificates\certs", locate the one you want to trust, and copy it over to "C:\ProgramData\OPC Foundation\CertificateStores\UA Applications\certs". Alternatively, there should also be a (server-specific) way to obtain the server's certificate on the server side directly (without it having to be first transferred to the client and initially rejected).

This will have to be repeated on every machine where the client app will run (and, if it is connecting to different server instances, the server certificates will then of course be different).

There are also insecure ways - not recommended.

Best regards

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escarre
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17 Jun 2021 10:45 #9776 by escarre

Replied by escarre on topic UA Authentication

Hello,

Finally I can read the data. When the application initiates, this form appears:

Attachment OPCUACertificatescreen.jpg not found

Can I avoid this form?

Thanks a lot,
Escarre

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escarre
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17 Jun 2021 09:38 #9775 by escarre

Replied by escarre on topic UA Authentication

Hello,

I have attatched the node I want to read.

Thanks,
Escarre

Attachment OPCUATemperature.jpg not found

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escarre
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17 Jun 2021 09:17 #9774 by escarre

Replied by escarre on topic UA Authentication

Hi,

I made another test, using OnDataChangeNotification.

When I receive the event, the eventArgs.Arguments.NodeDescriptor.DisplayString value NodeId="ns=3;s=_System.General.Temperature"
But eventArgs.AttributeData is nil.

Thanks again,
Escarre

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escarre
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17 Jun 2021 08:56 #9773 by escarre

Replied by escarre on topic UA Authentication

Hi again,

When I want to display results an exception raises: EIntFCastError Interface not supported
But if I use this code (Result is a _ValueResult variable):
Result := IInterface(Results[intVariable]) as _ValueResult
there are no error, but the Result.value is unassigned.

This code in another OPC server works properly, so I don't know why is not working.

Thanks,
Escarre

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support
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17 Jun 2021 07:21 #9769 by support

Replied by support on topic UA Authentication

Hello.

Reading a list of OPC UA items:

// This example shows how to read the attributes of 4 OPC-UA nodes at once, and
// display the results.
 
class procedure ReadMultiple.Main;
var
  Arguments: OleVariant;
  Client: OpcLabs_EasyOpcUA_TLB._EasyUAClient;
  I: Cardinal;
  ReadArguments1, ReadArguments2, ReadArguments3, ReadArguments4: _UAReadArguments;
  Result: _UAAttributeDataResult;
  Results: OleVariant;
begin
  ReadArguments1 := CoUAReadArguments.Create;
  ReadArguments1.EndpointDescriptor.UrlString := 'http://opcua.demo-this.com:51211/UA/SampleServer';
  ReadArguments1.NodeDescriptor.NodeId.ExpandedText := 'nsu=http://test.org/UA/Data/;i=10853';
 
  ReadArguments2 := CoUAReadArguments.Create;
  ReadArguments2.EndpointDescriptor.UrlString := 'http://opcua.demo-this.com:51211/UA/SampleServer';
  ReadArguments2.NodeDescriptor.NodeId.ExpandedText := 'nsu=http://test.org/UA/Data/;i=10845';
 
  ReadArguments3 := CoUAReadArguments.Create;
  ReadArguments3.EndpointDescriptor.UrlString := 'http://opcua.demo-this.com:51211/UA/SampleServer';
  ReadArguments3.NodeDescriptor.NodeId.ExpandedText := 'nsu=http://test.org/UA/Data/;i=10304';
 
  ReadArguments4 := CoUAReadArguments.Create;
  ReadArguments4.EndpointDescriptor.UrlString := 'http://opcua.demo-this.com:51211/UA/SampleServer';
  ReadArguments4.NodeDescriptor.NodeId.ExpandedText := 'nsu=http://test.org/UA/Data/;i=10389';
 
  Arguments := VarArrayCreate([0, 3], varVariant);
  Arguments[0] := ReadArguments1;
  Arguments[1] := ReadArguments2;
  Arguments[2] := ReadArguments3;
  Arguments[3] := ReadArguments4;
 
  // Instantiate the client object
  Client := CoEasyUAClient.Create;
 
  // Perform the operation
  TVarData(Results).VType := varArray or varVariant;
  TVarData(Results).VArray := PVarArray(Client.ReadMultiple(Arguments));
 
  // Display results
  for I := VarArrayLowBound(Results, 1) to VarArrayHighBound(Results, 1) do
  begin
    Result := IInterface(Results[I]) as _UAAttributeDataResult;
    if Result.Succeeded then
      WriteLn('results(', I, ').AttributeData: ', Result.AttributeData.ToString)
    else
      WriteLn('results(', I, ') *** Failure: ', Result.ErrorMessageBrief);
  end;
end;

Setting username and password: At the beginning of opclabs.doc-that.com/files/onlinedocs/QuickOpc/Latest/User%2...ck%20certificate%20status.html

(always switch to the "Object Pascal" example tab)

So you just need to combine parts of these two examples together.
Best regards

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escarre
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17 Jun 2021 06:36 #9767 by escarre

Replied by escarre on topic UA Authentication

Hello,

I need to set the user and password and read a list of OPC items.
What is the best way to get these data list?

Are there any example in Delphi?

Thanks,
Escarre

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support
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17 Jun 2021 06:16 #9766 by support

Replied by support on topic UA Authentication

Hello @escarre,
this is from the OPC Labs tech support.

What is it that you are trying to achieve?
The URL of the server is specified in method calls, sometimes directly, sometimes in the endpoint descriptor object. But I am not sure if that was your question.

Best regards

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escarre
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16 Jun 2021 12:59 #9763 by escarre

Replied by escarre on topic UA Authentication

Hi m.baumgartner,

I'm a Delphi developer and I'm trying to set up the user and password information.

I saw you used TEasyUAClientConfiguration, but how do you set the URL server information?

Thanks,
Escarre

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Attachment OPCUATemperature.jpg not found

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