OPCFoundation.NetStandard.Opc.Ua.PubSub.Adapter

OPCFoundation.NetStandard.Opc.Ua.PubSub.Adapter

Adapters that bind OPC UA PubSub publisher/subscriber/action datasets to an external OPC UA server through a managed client session (Opc.Ua.Client.ManagedSession).

• Publisher — reads an external server's nodes and publishes them as PubSub DataSets. Two source modes: cyclic Read calls, or a client Subscription (monitored items) with affinity per WriterGroup (default) or DataSetWriter.
• Subscriber — writes received PubSub DataSet values back to an external server.
• Actions — maps inbound PubSub Action requests to external server method calls.

Runtime changes to the PubSub configuration store or named adapter options are hot-reloaded incrementally: unchanged sources, sinks and external-server sessions are reused, while removed datasets/readers release their session references. Action target additions and mapping changes are applied by registering updated handlers; target removal currently requires a host restart because the core PubSub action responder API has no unregister operation.

services.AddOpcUa()
    .AddPubSub(pubsub => pubsub
        .AddPublisher()
        .AddUdpTransport()
        .UseConfigurationFile("pubsub-config.xml")
        .AddServerAsPublisher(options =>
        {
            options.Connection.EndpointUrl = "opc.tcp://plant-server:4840";
            options.ReadMode = ReadMode.Subscription; // or Cyclic
        }));

See docs/PubSub.md for the full guide.