There is no such notion as "canonical data type" in OPC UA. There is just a data type. Maybe you can explain what you are trying to achieve.

Each node has many attributes (there are about 20 or so of them), and they are mostly static in nature. Only the Value attribute, which is the actual value, has more dynamic nature. For most servers, reading any attribute other than Value simply means providing an in-memory value. Reading the DataType attribute is *the* method to obtain the data type in OPC UA.

This has nothing to do with "the library", i.e. whether you are using QuickOPC or something else. It is how OPC UA is specified.

Of course, in order for the reading to be effective with many nodes, you have to stay away from reading them one by one - you need to put more of them into a ReadMultipleValues call.

Best regards

You can read the DataType attribute the node: opclabs.doc-that.com/files/onlinedocs/QuickOpc/Latest/User%2...%20of%20a%20single%20node.html .

The returned value is a Node ID, which can corresponding to some of the "standard" types in the OPC UA specification (usually), or to a custom type.

The "standard" types are in UADataTypeIds class.

Best regards