Problem when trying to monitor items with OPC Scout V10 client with open62541 server (bin/examples/server)

If I try to monitor 'current time' item :

OPC Scout V10 shows :

For subscriptions :
Type : null
Result : Bad_WaitingForInitialData
and it does not show any value

On the right ('Properties' tab), all seem to be correct.

PublishResponse seem to be valid :

If I click on read, the value are displayed :

If I try to write a value with OPC Scout, I have :

Can we have a problem with Data type in PublishResponse ? Like #1317 ?

Has anyone ever tried open62541 server with OPC Scout V10 client?

Please provide the following information:

• open62541 Version master
• Other OPC UA SDKs used (client or server):

OPC Scout log file :

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and

I did some additional tests with opc.tcp://opcua.demo-this.com:51210/UA/SampleServer

I compare opcua.demo-this.com (on the left) with open62541 (on the right)

In opcua.demo-this.com we have an array size of 0 for PublishResponse/DiagnosticInfos
In open62541 we have an array size of -1 for PublishResponse/DiagnosticInfos

In opcua.demo-this.com we have an array size of 1 for DataChangeNotification/DiagnosticInfos
In open62541 we have an array size of -1 for DataChangeNotification/DiagnosticInfos

Just to see if the problem come from here, is there an easy way to change open62541 to answere like opcua.demo-this.com ?

Thanks in advance for your help.

Hey @StalderT

the standard describes the diagnosticinfos in a DataChangeNotification as follows:

List of diagnostic information. The size and order of this list matches the size
and order of the monitoredItems parameter. There is one entry in this list for
each Node contained in the monitoredItems parameter. This list is empty if
diagnostics information was not requested or is not available for any of the
MonitoredItems. DiagnosticInfo is a common type defined in 7.8.

We can add diagnosticinfos to behave like opcua.demo-this.com. But it is additional overhead that is not required.

The notification message is built here:

Can you make a test whether adding an array of empty diagnosticinfos helps?
Sadly, I don't have a Siemens Scout to verify myself.

Yes I can make a test, but can you help me adding an array of empty diagnosticinfos?

Tomorrow I will also watch if OPC Scout request diagnostics information. Do you know where this information can be found?

Apparently OPC Scout asks diagnostics information :
Bomb factory pultec bundle cracked.

I try to add this in prepareNotificationMessage

Works well but not correct the issue.

@jpfr just to make a another test, do you know how I can modify open62541 to send ArraySize 0 for a NULL array instead -1 :

This is the last thing that differs. Thanks in advance.

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Just create an array of size 0. with UA_Array_new.
This returns a special sentinel value in the pointer to differentiate between an undefined array (-1).

Could you find out which difference causes the Scout to reject?

No, I spent a lot of time on it but I have not found it yet. At the moment I think he does not like 'valueRank = -2'. Sending an array of size 0 change nothing.

I also found a difference here:

Sould we not send as message of type UA_TYPES[UA_TYPES_SERVICEFAULT] instead UA_TYPES[UA_TYPES_PUBLISHRESPONSE]

First problem here for LocalIdArray, open62541 return :

OPCScout logs :
Exception: Unable to cast object of type 'Opc.Ua.ExtensionObject[]' to type 'System.String[]'.

opc.tcp://opcua.demo-this.com:51210/UA/SampleServer return :

this patch resolve all the problems and OPCScoutV10 works fine with open62541