OPCFoundation.NetStandard.Opc.Ua.PubSub

OPC UA .NET Standard — PubSub

OPCFoundation.NetStandard.Opc.Ua.PubSub implements the publisher / subscriber side-channel defined by OPC 10000-14 (Part 14). It supports the UADP and JSON message mappings over UDP, MQTT, and broker-less transports — independent of the standard Client / Server session model.

Overview

The package provides:

• The IPubSubApplication runtime and the connection / writer-group / reader-group object model, built via a fluent / DI API.
• UADP (binary) and JSON message mappings.
• UDP-, MQTT-, and broker-less transport profiles (in the companion Opc.Ua.PubSub.Udp / Opc.Ua.PubSub.Mqtt packages).
• Dataset filtering, AES-CTR message security with a Security Key Service, diagnostics, and persisted state.

Getting started

Configure a publisher (or subscriber) through dependency injection:

using Microsoft.Extensions.DependencyInjection;

builder.Services.AddOpcUa()
    .AddPubSub(pubsub => pubsub
        .AddPublisher()
        .AddUdpTransport()
        .ConfigureApplication(app => app
            .WithApplicationId("urn:example:publisher")
            .UseConfigurationFile("publisher.xml")));

The legacy 1.04 UaPubSubApplication.Create(...) API has been removed in 2.0. See the PubSub migration guide to move to the fluent builder / DI surface.

Target frameworks

net48, net8.0, net9.0, net10.0.

Additional documentation

See the main repository README and the dedicated Opc.Ua.PubSub README for the full design (encodings, transports, security-key-service, discovery).