feat: OPC UA protocol plugin (v0.4)
Second protocol plugin proving multi-protocol architecture. New
Junction.Protocols.OpcUa (multi-target net48;net8.0 — SDK has no ns2.0):
- OpcuaDriverFactory: config validation (EndpointUrl/SecurityMode/Policy/
AuthMode/Username/Password/NodeIds/BrowseRoot/TimeoutSeconds), CONFIG_* codes.
- OpcuaDriver: ReadCurrentAsync (read configured nodes) + ProbeAsync (browse
address space), linked-CTS timeout, Result mapping, opt-in FilterToMonitored
— mirrors MtconnectDriver.
- IUaClient seam (SDK-free) injected for testability; UaClient wraps OPC UA
Session (non-obsolete async API), Directory PKI store, anon/user-pass auth.
SDK: OPCFoundation.NetStandard.Opc.Ua.Client 1.5.378.156 (MIT), pinned exact,
transitive closure copied per-TFM into plugins/opcua/ (CopyLocalLockFileAssemblies
+ CopyOpcuaPlugin target). Host: AutoGenerateBindingRedirects. Core untouched —
protocol auto-discovered by plugin loader.
Projects: +Junction.Protocols.OpcUa, Junction.App (wiring), Junction.sln,
Junction.Tests (+23 tests: 13 factory + 10 driver via Mock<IUaClient>). 171 pass.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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