Add MinimalClient - lightweight OPC UA console client with fluent API

[Copilot]

Description

Adds MinimalClient, a compact console OPC UA application demonstrating the unified dependency-injection surface, secure endpoint discovery, managed sessions, fluent V2 subscriptions, and Alarms & Conditions support.

Changes

• Adds ConfigureApplication(options => ...) to build and validate one shared ApplicationConfiguration for combined client/server hosts.
• Extends OpcUaClientOptions so the existing AddClient(options => ...) callback accepts application identity, PKI, and certificate-validation settings like AddServer(...).
• Composes root ConfigureApplication(...) values with client defaults in either registration order; shared values take precedence and client values fill gaps.
• Keeps server samples on their established AddServer(...) configuration pattern.
• Adds MinimalClient as a .NET 10 Native AOT console application using top-level statements and HostApplicationBuilder.
• Discovers a SignAndEncrypt / Basic256Sha256 endpoint by default; --insecure and --auto-accept are explicit opt-ins with warnings.
• Demonstrates fluent AddSubscription(...), TryAddMonitoredItem(...), and AlarmClientFactory usage.
• Adds targeted configuration, client, and combined client/server tests.

Example

builder.Services
    .AddOpcUa()
    .AddClient(options =>
    {
        options.ApplicationName = "MinimalClient";
        options.ApplicationUri = "urn:localhost:OPCFoundation:MinimalClient";
        options.ProductUri = "uri:opcfoundation.org:MinimalClient";
        options.Session = new ManagedSessionOptions
        {
            SessionName = "MinimalClient",
            SessionTimeout = TimeSpan.FromSeconds(60)
        };
    })
    .AddDiscoveryAndConnect(options =>
    {
        options.DiscoveryUrl = discoveryUrl;
        options.SecurityMode = MessageSecurityMode.SignAndEncrypt;
        options.SecurityPolicyUri = SecurityPolicies.Basic256Sha256;
    })
    .AddSubscriptions()
    .AddAlarms();

Related Issues

If there is no issue yet, open one and link it here.

Checklist

• I have signed the CLA and read the CONTRIBUTING doc.
• I have added tests that prove my fix is effective or that my feature works and increased code coverage.
• I have added all necessary documentation.
• I have verified that my changes do not introduce new build or analyzer warnings.
• I ran all tests locally using the UA.slnx solution against at least .NET Framework and .NET 10.
• I fixed all failing and flaky tests in the CI pipelines and all CodeQL warnings.
• I have addressed all PR feedback received.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
2 out of 3 committers have signed the CLA.

✅ romanett
✅ marcschier
❌ Copilot
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[romanett]

@copilot use the DI container described here: https://github.com/OPCFoundation/UA-.NETStandard/blob/master/Docs/DependencyInjection.md

[Copilot]

@copilot use the DI container described here: https://github.com/OPCFoundation/UA-.NETStandard/blob/master/Docs/DependencyInjection.md

✅ Implemented. MinimalClient now uses the DI container as described in the DependencyInjection.md documentation:

• HostApplicationBuilder for DI setup
• Fluent .AddOpcUa(), .AddClient(), and .AddAlarms() API
• IManagedSessionFactory resolved from DI container
• Configuration options bound via OpcUaClientOptions

See the updated Program.cs for the pattern.

[codecov]

Codecov Report

❌ Patch coverage is 88.94737% with 42 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.48%. Comparing base (007cfaf) to head (9dfb6e6).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
...iguration/OpcUaApplicationConfigurationProvider.cs	83.92%	12 Missing and 6 partials ⚠️
.../Opc.Ua.Server/Hosting/OpcUaServerHostedService.cs	82.05%	7 Missing and 7 partials ⚠️
...ting/OpcUaServerApplicationConfigurationFeature.cs	84.37%	0 Missing and 10 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4006      +/-   ##
==========================================
- Coverage   73.72%   73.48%   -0.24%     
==========================================
  Files        1340     1345       +5     
  Lines      179309   179707     +398     
  Branches    31541    31615      +74     
==========================================
- Hits       132188   132051     -137     
- Misses      36385    36968     +583     
+ Partials    10736    10688      -48     

Files with missing lines	Coverage Δ
...c/Opc.Ua.Client/Discovery/OpcUaDiscoveryService.cs	100.00% <100.00%> (+52.38%)	⬆️
...uent/OpcUaClientApplicationConfigurationFeature.cs	100.00% <100.00%> (ø)
...c.Ua.Client/Fluent/OpcUaClientBuilderExtensions.cs	81.63% <100.00%> (+1.67%)	⬆️
src/Opc.Ua.Client/Fluent/OpcUaClientOptions.cs	100.00% <100.00%> (ø)
...a.Configuration/ApplicationConfigurationBuilder.cs	95.58% <100.00%> (+0.17%)	⬆️
...rc/Opc.Ua.Configuration/OpcUaApplicationOptions.cs	100.00% <100.00%> (ø)
...n/OpcUaConfigurationServiceCollectionExtensions.cs	93.33% <100.00%> (+33.33%)	⬆️
....Ua.Server/Hosting/OpcUaServerBuilderExtensions.cs	70.33% <100.00%> (+0.15%)	⬆️
...ting/OpcUaServerApplicationConfigurationFeature.cs	84.37% <84.37%> (ø)
.../Opc.Ua.Server/Hosting/OpcUaServerHostedService.cs	75.31% <82.05%> (+19.80%)	⬆️
... and 1 more

... and 55 files with indirect coverage changes

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[Copilot]

Pull request overview

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Adds a new “MinimalClient” console application to the solution to demonstrate a lightweight OPC UA client built with DI and the managed-session fluent APIs.

Changes:

• Added Applications/MinimalClient project (net10.0, Native AOT) with a simple browse + read flow.
• Wired the new project into UA.slnx and added a missing Microsoft.Extensions.DependencyInjection package version.
• Added README documentation for running and understanding the sample.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
UA.slnx	Adds the new MinimalClient project to the solution.
Directory.Packages.props	Adds a package version entry for Microsoft.Extensions.DependencyInjection.
Applications/MinimalClient/README.md	Documents the MinimalClient purpose, features, and usage.
Applications/MinimalClient/Properties/AssemblyInfo.cs	Adds assembly metadata for the new project.
Applications/MinimalClient/Program.cs	Implements the minimal console client (DI setup + connect + browse + read).
Applications/MinimalClient/MinimalClient.csproj	Defines the new net10.0 console app project with AOT enabled and references.