The main OPC UA Service Sets are: Discovery, SecureChannel, Session, NodeManagement, View, Query, Attribute (Read/Write), MonitoredItem, Subscription, and Method (Call).
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OPC UA Part 4 organises services into standardised sets. Discovery finds servers (FindServers, GetEndpoints). SecureChannel secures the transport. Session manages user authentication. View covers Address Space navigation (Browse, TranslateBrowsePathsToNodeIds). Attribute handles Read and Write of values and metadata. MonitoredItem and Subscription implement the change-notification mechanism (items grouped in subscriptions that publish periodically). Method exposes RPC-style calls. NodeManagement allows dynamic creation and deletion of nodes. Query supports filtered server-side queries on the Address Space.
Memorise the service sets as functional layers (discovery, security, session, browse, read/write, subscribe, call): every OPC UA client SDK exposes APIs that map one-to-one to these groups.
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