Hi,

I would suggest that you read the client tutorial found in the “doc” folder of the SDK package. Also play around with the SampleConsoleClient, which is found in the samples folder. If you look through the SampleConsoleClient’s source code, you should be able to understand how to do the basics, i.e. Browsing, Reading and Writing.

The tree nodes under Root are: Objects, Types and Views. Types contains type information (like in an object oriented programming languate), Objects contains instances of those types and Views could contain a “sub-view” to the address space (I have not yet seen any server to use those, so you can ignore that).

You do operations on known NodeIds, If you do not know the NodeIds of nodes under Objects, you Browse the NodeId for the Objects node and get the next set of References and so on. Usually you know some starting point other than the Root and e.g. are interested only on some nodes; graphical client applications like UaExpert or our https://www.prosysopc.com/products/opc-ua-client/ makes visualizing the address space easier (also the SampleConsoleClient does this in a sense, but it is console-based).

– Bjarne

P.S. you could also read the specification if you like, https://opcfoundation.org/developer-tools/specifications-unified-architecture (requires registering). The first part explains the concepts of UA pretty well in my opinion and is not that deeply technical.