Framework-first doctrine, DI logger factory, config refactor

Introduced framework-first design rules and updated documentation to clarify framework vs. consumer boundaries. Added AcLoggerOptions and DI-based logger factory extensions to AyCode.Core, enabling per-category logger instantiation from appsettings.json. Standardized SignalR connection setup with AddAcDefaults, replacing project-specific code. Enhanced protocol configuration for DI scope isolation. Refactored appsettings.json structure and added MSBuild targets for config propagation. Removed obsolete code and updated comments to match new patterns.

FruitBankHybrid.Shared.Tests/TestSignalRClientFactory.cs

@@ -26,7 +26,7 @@ internal static class TestSignalRClientFactory
             new SignaRClientLogItemWriter(AppType.TestUnit, LogLevel.Detail, testCategoryName)
         };
 
-        Func<string, AcLoggerBase> loggerFactory =
+        Func<string, LoggerClient> loggerFactory =
             categoryName => new LoggerClient(categoryName, logWriters.ToArray());
 
         var connectionOptions = new AcHubConnectionOptions
@@ -45,7 +45,7 @@ internal static class TestSignalRClientFactory
 
         var logger = loggerFactory(nameof(FruitBankSignalRClient));
 
-        var hubBuilder = new HubConnectionBuilder().AddFruitBankDefaults(logger, connectionOptions);
+        var hubBuilder = new HubConnectionBuilder().AddAcDefaults(logger, connectionOptions);
         hubBuilder.AddAcBinaryProtocol(opts => opts.ProtocolMode = BinaryProtocolMode.AsyncSegment);
 
         return new FruitBankSignalRClient(hubBuilder, loggerFactory);

FruitBankHybrid.Shared/Services/SignalRs/FruitBankHubConnectionExtensions.cs

@@ -1,35 +0,0 @@
-using AyCode.Core.Loggers;
-using AyCode.Services.SignalRs;
-using Microsoft.AspNetCore.SignalR.Client;
-using Microsoft.Extensions.Logging;
-
-namespace FruitBankHybrid.Shared.Services.SignalRs;
-
-/// <summary>
-/// FruitBank-specific hub-connection setup.
-/// <para>
-/// Connection-level configuration (URL, buffers, timeouts, reconnect) is delegated to the
-/// framework's <see cref="AcSignalRConnectionExtensions.AddAcConnection"/>, driven by
-/// <see cref="AcHubConnectionOptions"/> from <c>appsettings.json</c>. The logger is supplied
-/// by the caller (typically via a DI-registered <c>Func&lt;string, AcLoggerBase&gt;</c> factory
-/// in <c>Program.cs</c>), keeping this extension free of <c>LoggerClient</c> construction.
-/// </para>
-/// </summary>
-public static class FruitBankHubConnectionExtensions
-{
-    /// <summary>
-    /// Applies <see cref="AcSignalRConnectionExtensions.AddAcConnection"/> with the given
-    /// <paramref name="connectionOptions"/>, then bridges <paramref name="logger"/> into
-    /// SignalR's internal <c>ILogger</c> pipeline.
-    /// </summary>
-    public static IHubConnectionBuilder AddFruitBankDefaults(this IHubConnectionBuilder builder, AcLoggerBase logger, AcHubConnectionOptions connectionOptions)
-    {
-        return builder
-            .AddAcConnection(connectionOptions)
-            .ConfigureLogging(logging =>
-            {
-                logging.SetMinimumLevel(Microsoft.Extensions.Logging.LogLevel.Information);
-                logging.AddAcLogger(_ => logger);
-            });
-    }
-}

FruitBankHybrid.Shared/Services/SignalRs/FruitBankSignalRClient.cs

@@ -26,7 +26,7 @@ namespace FruitBankHybrid.Shared.Services.SignalRs
 {
     public class FruitBankSignalRClient : AcSignalRClientBase, IFruitBankDataControllerClient, ICustomOrderSignalREndpointClient, IStockSignalREndpointClient
     {
-        public FruitBankSignalRClient(IHubConnectionBuilder hubBuilder, Func<string, AcLoggerBase> loggerFactory)
+        public FruitBankSignalRClient(IHubConnectionBuilder hubBuilder, Func<string, LoggerClient> loggerFactory)
             : base(hubBuilder, loggerFactory(nameof(FruitBankSignalRClient)))
         {
             EnableBinaryDiagnostics = FruitBankConstClient.SignalRSerializerDiagnosticLog;

FruitBankHybrid.Shared/appsettings.json

@@ -0,0 +1,44 @@
+{
+    "Logging": {
+        "LogLevel": {
+            "Default": "Debug",
+            "Microsoft.AspNetCore": "Warning"
+        }
+    },
+    "AyCode": {
+	    "ProjectId": "aad53443-2ee2-4650-8a99-97e907265e4e",
+	    "Urls": {
+		    "BaseUrl": "https://localhost:7144",
+		    "ApiBaseUrl": "https://localhost:7144"
+	    },
+	    "Logger": {
+		    "AppType": "Server",
+		    "LogLevel": "Detail",
+		    "LogWriters": [
+			    {
+				    "LogLevel": "Detail",
+				    "LogWriterType": "FruitBank.Common.Server.Services.Loggers.ConsoleLogWriter, FruitBank.Common.Server, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
+			    }
+		    ]
+	    }
+
+    },
+    "AcHubConnection": {
+        "Url": "https://localhost:59579/fbHub",
+        "TransportMaxBufferSize": 30000000,
+        "ApplicationMaxBufferSize": 30000000,
+        "CloseTimeout": "00:00:10",
+        "KeepAliveInterval": "00:01:00",
+        "ServerTimeout": "00:03:00",
+        "SkipNegotiation": true,
+        "Transports": "WebSockets",
+        "UseAutomaticReconnect": true,
+        "UseStatefulReconnect": true
+    },
+    "AcBinaryHubProtocol": {
+        "ProtocolMode": "AsyncSegment",
+        "BufferSize": 4096,
+        "WaitForFlush": false,
+        "FlushTimeout": "00:00:10"
+    }
+}

FruitBankHybrid.Web.Client/FruitBankHybrid.Web.Client.csproj

@@ -26,6 +26,27 @@
 		<ProjectReference Include="..\FruitBankHybrid.Shared\FruitBankHybrid.Shared.csproj" />
 	</ItemGroup>
 
+	<!-- Shared appsettings.json synced into wwwroot at build time.
+	     Approach: pre-build Copy Target (not <Content Include Link=...>), because:
+	     - <Content Include="..\..." Link="wwwroot\..."/> triggers StaticWebAssets.Normalize() "Illegal characters"
+	     - pre-normalizing via [System.IO.Path]::GetFullPath(...) still fails (the absolute path also trips the validator)
+	     - a pre-build Copy creates a physical wwwroot/appsettings.json which the StaticWebAssets auto-discovery
+	       picks up naturally, same as any other wwwroot file
+	     BeforeTargets lists multiple early targets to ensure the Copy runs before static-asset discovery,
+	     regardless of which one triggers first in a given SDK version.
+	     NOTE: a clean build (delete obj/) is required the first time, because the static-asset manifest
+	     is cached in obj/ and stale entries persist across incremental builds.
+	     The physical wwwroot/appsettings.json is a build artifact — commit or gitignore per team policy;
+	     edits should always be made in FruitBankHybrid.Shared/appsettings.json (the canonical source). -->
+	<Target Name="CopySharedAppSettings"
+	        BeforeTargets="CollectPackageReferences;AssignTargetPaths;ResolveStaticWebAssetsInputs;BeforeBuild"
+	        Inputs="..\FruitBankHybrid.Shared\appsettings.json"
+	        Outputs="wwwroot\appsettings.json">
+		<Copy SourceFiles="..\FruitBankHybrid.Shared\appsettings.json"
+		      DestinationFiles="wwwroot\appsettings.json"
+		      SkipUnchangedFiles="true" />
+	</Target>
+
 	<ItemGroup>
 		<Reference Include="AyCode.Core">
 			<HintPath>..\..\..\..\Aycode\Source\AyCode.Core\AyCode.Services.Server\bin\FruitBank\$(Configuration)\net9.0\AyCode.Core.dll</HintPath>

FruitBankHybrid.Web.Client/Program.cs

@@ -42,22 +42,26 @@ builder.Services.Configure<AcBinaryHubProtocolOptions>(opts =>
     if (opts.ProtocolMode == BinaryProtocolMode.AsyncSegment) opts.ProtocolMode = BinaryProtocolMode.Segment;
 });
 
-// Logger factory — thin Logger, DI-singleton writers. Each call yields a fresh LoggerClient
+// Logger options + framework factory. LoggerClient instances are created per caller category,
-// with the caller's categoryName. Mirrors Microsoft's ILoggerFactory / ILogger<T> pattern.
+// with AppType+LogLevel from appsettings and writers resolved from DI via IAcLogWriterClientBase.
-builder.Services.AddSingleton<Func<string, AcLoggerBase>>(sp => categoryName => new LoggerClient(categoryName, sp.GetServices<IAcLogWriterClientBase>().ToArray()));
+builder.Services.Configure<AcLoggerOptions>(builder.Configuration.GetSection("AyCode:Logger"));
+builder.Services.AddAcLoggerFactory<LoggerClient, IAcLogWriterClientBase>();
 
 // HubConnectionBuilder — transient so each consumer gets a fresh builder to Build().
 // All connection and protocol configuration flows from appsettings.json via IOptions<T>;
-// AddFruitBankDefaults only bridges the provided logger into SignalR's internal pipeline.
+// AddAcDefaults (framework) applies AcHubConnectionOptions and bridges the provided logger into SignalR's internal pipeline.
+// NOTE: AcBinaryHubProtocolOptions is resolved from the OUTER service provider and passed
+// explicitly — HubConnectionBuilder's inner DI cannot see outer services.Configure<T>() registrations.
 builder.Services.AddTransient<IHubConnectionBuilder>(sp =>
 {
-    var loggerFactory = sp.GetRequiredService<Func<string, AcLoggerBase>>();
+    var loggerFactory = sp.GetRequiredService<Func<string, LoggerClient>>();
     var connectionOpts = sp.GetRequiredService<IOptions<AcHubConnectionOptions>>().Value;
+    var protocolOpts = sp.GetRequiredService<IOptions<AcBinaryHubProtocolOptions>>().Value;
 
     var logger = loggerFactory(nameof(FruitBankSignalRClient));
-    var hubBuilder = new HubConnectionBuilder().AddFruitBankDefaults(logger, connectionOpts);
+    var hubBuilder = new HubConnectionBuilder().AddAcDefaults(logger, connectionOpts);
 
-    hubBuilder.AddAcBinaryProtocol();   // IOptions<AcBinaryHubProtocolOptions> from DI
+    hubBuilder.AddAcBinaryProtocol(protocolOpts);
     return hubBuilder;
 });
 

FruitBankHybrid.Web.Client/wwwroot/appsettings.Development.json

@@ -1,8 +0,0 @@
-{
-  "Logging": {
-    "LogLevel": {
-      "Default": "Information",
-      "Microsoft.AspNetCore": "Warning"
-    }
-  }
-}

FruitBankHybrid.Web.Client/wwwroot/appsettings.json

@@ -1,28 +1,44 @@
 {
-  "Logging": {
+    "Logging": {
-    "LogLevel": {
+        "LogLevel": {
-      "Default": "Information",
+            "Default": "Debug",
-      "Microsoft.AspNetCore": "Warning"
+            "Microsoft.AspNetCore": "Warning"
+        }
+    },
+    "AyCode": {
+	    "ProjectId": "aad53443-2ee2-4650-8a99-97e907265e4e",
+	    "Urls": {
+		    "BaseUrl": "https://localhost:7144",
+		    "ApiBaseUrl": "https://localhost:7144"
+	    },
+	    "Logger": {
+		    "AppType": "Server",
+		    "LogLevel": "Detail",
+		    "LogWriters": [
+			    {
+				    "LogLevel": "Detail",
+				    "LogWriterType": "FruitBank.Common.Server.Services.Loggers.ConsoleLogWriter, FruitBank.Common.Server, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
+			    }
+		    ]
+	    }
+
+    },
+    "AcHubConnection": {
+        "Url": "https://localhost:59579/fbHub",
+        "TransportMaxBufferSize": 30000000,
+        "ApplicationMaxBufferSize": 30000000,
+        "CloseTimeout": "00:00:10",
+        "KeepAliveInterval": "00:01:00",
+        "ServerTimeout": "00:03:00",
+        "SkipNegotiation": true,
+        "Transports": "WebSockets",
+        "UseAutomaticReconnect": true,
+        "UseStatefulReconnect": true
+    },
+    "AcBinaryHubProtocol": {
+        "ProtocolMode": "AsyncSegment",
+        "BufferSize": 4096,
+        "WaitForFlush": false,
+        "FlushTimeout": "00:00:10"
     }
-  },
-
-  "AcHubConnection": {
-    "Url": "https://localhost:59579/fbHub",
-    "TransportMaxBufferSize": 30000000,
-    "ApplicationMaxBufferSize": 30000000,
-    "CloseTimeout": "00:00:10",
-    "KeepAliveInterval": "00:01:00",
-    "ServerTimeout": "00:03:00",
-    "SkipNegotiation": true,
-    "Transports": "WebSockets",
-    "UseAutomaticReconnect": true,
-    "UseStatefulReconnect": true
-  },
-
-  "AcBinaryHubProtocol": {
-    "ProtocolMode": "Segment",
-    "BufferSize": 4096,
-    "WaitForFlush": true,
-    "FlushTimeout": "00:00:10"
-  }
 }

FruitBankHybrid.Web/FruitBankHybrid.Web.csproj

@@ -85,6 +85,19 @@
 		<Folder Include="Services\SignalRs\" />
 	</ItemGroup>
 
+	<!-- Shared appsettings.json copied into project root at build time.
+	     Why a Copy target instead of <Content Include="..\..." Link="appsettings.json" CopyToOutputDirectory="PreserveNewest"/>:
+	     the Link approach only copies the file to bin/Debug output, but ASP.NET Core's WebApplicationBuilder
+	     in development reads appsettings.json from the ContentRoot (= project directory), not from the output folder.
+	     Materializing the file physically in the project root makes it discoverable by the default configuration
+	     loader in every run mode (F5 / dotnet run / published), and the SDK auto-include for appsettings*.json
+	     takes care of copy-to-output from there. -->
+	<Target Name="CopySharedAppSettings" BeforeTargets="BeforeBuild" Inputs="..\FruitBankHybrid.Shared\appsettings.json" Outputs="appsettings.json">
+		<Copy SourceFiles="..\FruitBankHybrid.Shared\appsettings.json"
+		      DestinationFiles="appsettings.json"
+		      SkipUnchangedFiles="true" />
+	</Target>
+
 
 
 </Project>

FruitBankHybrid.Web/Program.cs

@@ -5,7 +5,6 @@ using FruitBank.Common;
 using FruitBank.Common.Models;
 using FruitBank.Common.Services;
 using FruitBank.Common.Server.Services.Loggers;
-using FruitBank.Common.Server.Services.SignalRs;
 using FruitBankHybrid.Shared.Databases;
 using FruitBankHybrid.Shared.Services;
 using FruitBankHybrid.Shared.Services.Loggers;
@@ -21,14 +20,15 @@ builder.Services.AddRazorComponents().AddInteractiveWebAssemblyComponents();
 builder.Services.AddDevExpressBlazor(configure => configure.SizeMode = DevExpress.Blazor.SizeMode.Medium);
 builder.Services.AddMvc();
 
-builder.Services.AddSignalR(options => options.MaximumReceiveMessageSize = 256 * 1024);
 builder.Services.AddSingleton<IFormFactor, FormFactor>();
 builder.Services.AddSingleton<ISecureCredentialService, ServerSecureCredentialService>();
 
 builder.Services.AddSingleton<IAcLogWriterBase, ConsoleLogWriter>();
-// Logger factory — thin Logger, DI-singleton writers. Each call yields a fresh LoggerClient
+
-// with the caller's categoryName. Mirrors Microsoft's ILoggerFactory / ILogger<T> pattern.
+// Logger options + framework factory. LoggerClient instances are created per caller category,
-builder.Services.AddSingleton<Func<string, AcLoggerBase>>(sp => categoryName => new LoggerClient(categoryName, sp.GetServices<IAcLogWriterClientBase>().ToArray()));
+// with AppType+LogLevel from appsettings and writers resolved from DI via IAcLogWriterBase.
+builder.Services.Configure<AcLoggerOptions>(builder.Configuration.GetSection("AyCode:Logger"));
+builder.Services.AddAcLoggerFactory<LoggerClient>();
 
 builder.Services.AddSingleton<LoggedInModel>(sp => new LoggedInModel(sp.GetRequiredService<ISecureCredentialService>()));
 
@@ -48,16 +48,19 @@ builder.Services.Configure<AcBinaryHubProtocolOptions>(opts =>
 
 // HubConnectionBuilder — transient so each consumer gets a fresh builder to Build().
 // All connection and protocol configuration flows from appsettings.json via IOptions<T>;
-// AddFruitBankDefaults only bridges the provided logger into SignalR's internal pipeline.
+// AddAcDefaults (framework) applies AcHubConnectionOptions and bridges the provided logger into SignalR's internal pipeline.
+// NOTE: AcBinaryHubProtocolOptions is resolved from the OUTER service provider and passed
+// explicitly — HubConnectionBuilder's inner DI cannot see outer services.Configure<T>() registrations.
 builder.Services.AddTransient<IHubConnectionBuilder>(sp =>
 {
-    var loggerFactory = sp.GetRequiredService<Func<string, AcLoggerBase>>();
+    var loggerFactory = sp.GetRequiredService<Func<string, LoggerClient>>();
     var connectionOpts = sp.GetRequiredService<IOptions<AcHubConnectionOptions>>().Value;
+    var protocolOpts = sp.GetRequiredService<IOptions<AcBinaryHubProtocolOptions>>().Value;
 
     var logger = loggerFactory(nameof(FruitBankSignalRClient));
-    var hubBuilder = new HubConnectionBuilder().AddFruitBankDefaults(logger, connectionOpts);
+    var hubBuilder = new HubConnectionBuilder().AddAcDefaults(logger, connectionOpts);
 
-    hubBuilder.AddAcBinaryProtocol();   // IOptions<AcBinaryHubProtocolOptions> from DI
+    hubBuilder.AddAcBinaryProtocol(protocolOpts);
     return hubBuilder;
 });
 
@@ -82,9 +85,6 @@ else
     app.UseHsts();
 }
 
-app.MapHub<LoggerSignalRHub>($"/{FruitBankConstClient.LoggerHubName}");
-app.MapHub<DevAdminSignalRHub>($"/{FruitBankConstClient.DefaultHubName}");
-
 app.UseHttpsRedirection();
 
 app.UseStaticFiles();

FruitBankHybrid.Web/appsettings.Development.json

@@ -1,8 +0,0 @@
-{
-  "Logging": {
-    "LogLevel": {
-      "Default": "Information",
-      "Microsoft.AspNetCore": "Warning"
-    }
-  }
-}

FruitBankHybrid.Web/appsettings.json

@@ -1,48 +1,44 @@
 {
-	"Logging": {
+    "Logging": {
-		"LogLevel": {
+        "LogLevel": {
-			"Default": "Debug",
+            "Default": "Debug",
-			"Microsoft.AspNetCore": "Warning"
+            "Microsoft.AspNetCore": "Warning"
-		}
+        }
-	},
+    },
-	"AllowedHosts": "*",
+    "AyCode": {
+	    "ProjectId": "aad53443-2ee2-4650-8a99-97e907265e4e",
+	    "Urls": {
+		    "BaseUrl": "https://localhost:7144",
+		    "ApiBaseUrl": "https://localhost:7144"
+	    },
+	    "Logger": {
+		    "AppType": "Server",
+		    "LogLevel": "Detail",
+		    "LogWriters": [
+			    {
+				    "LogLevel": "Detail",
+				    "LogWriterType": "FruitBank.Common.Server.Services.Loggers.ConsoleLogWriter, FruitBank.Common.Server, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
+			    }
+		    ]
+	    }
 
-	"AcHubConnection": {
+    },
-		"Url": "https://localhost:59579/fbHub",
+    "AcHubConnection": {
-		"TransportMaxBufferSize": 30000000,
+        "Url": "https://localhost:59579/fbHub",
-		"ApplicationMaxBufferSize": 30000000,
+        "TransportMaxBufferSize": 30000000,
-		"CloseTimeout": "00:00:10",
+        "ApplicationMaxBufferSize": 30000000,
-		"KeepAliveInterval": "00:01:00",
+        "CloseTimeout": "00:00:10",
-		"ServerTimeout": "00:03:00",
+        "KeepAliveInterval": "00:01:00",
-		"SkipNegotiation": true,
+        "ServerTimeout": "00:03:00",
-		"Transports": "WebSockets",
+        "SkipNegotiation": true,
-		"UseAutomaticReconnect": true,
+        "Transports": "WebSockets",
-		"UseStatefulReconnect": true
+        "UseAutomaticReconnect": true,
-	},
+        "UseStatefulReconnect": true
-
+    },
-	"AcBinaryHubProtocol": {
+    "AcBinaryHubProtocol": {
-		"ProtocolMode": "AsyncSegment",
+        "ProtocolMode": "AsyncSegment",
-		"BufferSize": 4096,
+        "BufferSize": 4096,
-		"WaitForFlush": true,
+        "WaitForFlush": false,
-		"FlushTimeout": "00:00:10"
+        "FlushTimeout": "00:00:10"
-	},
+    }
-
+}
-	"AyCode": {
-		"ProjectId": "aad53443-2ee2-4650-8a99-97e907265e4e",
-		"Urls": {
-			"BaseUrl": "https://localhost:7144",
-			"ApiBaseUrl": "https://localhost:7144"
-		},
-		"Logger": {
-			"AppType": "Server",
-			"LogLevel": "Detail",
-			"LogWriters": [
-				{
-					"LogLevel": "Detail",
-					"LogWriterType": "FruitBank.Common.Server.Services.Loggers.ConsoleLogWriter, FruitBank.Common.Server, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
-				}
-			]
-		}
-
-	}
-}

FruitBankHybrid/FruitBankHybrid.csproj

@@ -79,8 +79,9 @@
 	</PropertyGroup>
 
 	<ItemGroup>
-		<!-- appsettings.json — embedded so MauiAppBuilder can load via GetManifestResourceStream -->
+		<!-- Shared appsettings.json linked from FruitBankHybrid.Shared, embedded so MauiAppBuilder can load via GetManifestResourceStream.
-		<EmbeddedResource Include="appsettings.json" />
+		     LogicalName preserves the original manifest resource name so the loader in MauiProgram.cs doesn't need changes. -->
+		<EmbeddedResource Include="..\FruitBankHybrid.Shared\appsettings.json" Link="appsettings.json" LogicalName="FruitBankHybrid.appsettings.json" />
 	</ItemGroup>
 
 	<ItemGroup>

FruitBankHybrid/MauiProgram.cs

@@ -50,10 +50,10 @@ namespace FruitBankHybrid
 #endif
             builder.Services.AddSingleton<IAcLogWriterClientBase, SignaRClientLogItemWriter>();
 
-            // Logger factory — the Logger itself is a thin wrapper; writers (the real sinks)
+            // Logger options + framework factory. LoggerClient instances are created per caller category,
-            // are DI singletons. Each call produces a fresh LoggerClient with the caller's categoryName.
+            // with AppType+LogLevel from appsettings and writers resolved from DI via IAcLogWriterClientBase.
-            // Mirrors the Microsoft ILoggerFactory / ILogger<T> pattern.
+            builder.Services.Configure<AcLoggerOptions>(builder.Configuration.GetSection("AyCode:Logger"));
-            builder.Services.AddSingleton<Func<string, AcLoggerBase>>(sp => categoryName => new LoggerClient(categoryName, sp.GetServices<IAcLogWriterClientBase>().ToArray()));
+            builder.Services.AddAcLoggerFactory<LoggerClient, IAcLogWriterClientBase>();
 
             // Bind SignalR options from configuration.
             // Precedence: code default → appsettings.json (this line) → any later Configure<T> action.
@@ -68,16 +68,19 @@ namespace FruitBankHybrid
 
             // SignalR HubConnectionBuilder — transient so each consumer gets a fresh builder to Build().
             // All connection and protocol configuration flows from appsettings.json via IOptions<T>;
-            // AddFruitBankDefaults only bridges the provided logger into SignalR's internal pipeline.
+            // AddAcDefaults (framework) applies AcHubConnectionOptions and bridges the provided logger into SignalR's internal pipeline.
+            // NOTE: AcBinaryHubProtocolOptions is resolved from the OUTER service provider and passed
+            // explicitly — HubConnectionBuilder's inner DI cannot see outer services.Configure<T>() registrations.
             builder.Services.AddTransient<IHubConnectionBuilder>(sp =>
             {
-                var loggerFactory = sp.GetRequiredService<Func<string, AcLoggerBase>>();
+                var loggerFactory = sp.GetRequiredService<Func<string, LoggerClient>>();
                 var connectionOpts = sp.GetRequiredService<IOptions<AcHubConnectionOptions>>().Value;
+                var protocolOpts = sp.GetRequiredService<IOptions<AcBinaryHubProtocolOptions>>().Value;
 
                 var logger = loggerFactory(nameof(FruitBankSignalRClient));
-                var hubBuilder = new HubConnectionBuilder().AddFruitBankDefaults(logger, connectionOpts);
+                var hubBuilder = new HubConnectionBuilder().AddAcDefaults(logger, connectionOpts);
 
-                hubBuilder.AddAcBinaryProtocol();   // IOptions<AcBinaryHubProtocolOptions> from DI
+                hubBuilder.AddAcBinaryProtocol(protocolOpts);
                 return hubBuilder;
             });
 

FruitBankHybrid/appsettings.json

@@ -1,20 +0,0 @@
-{
-  "AcHubConnection": {
-    "Url": "https://localhost:59579/fbHub",
-    "TransportMaxBufferSize": 30000000,
-    "ApplicationMaxBufferSize": 30000000,
-    "CloseTimeout": "00:00:10",
-    "KeepAliveInterval": "00:01:00",
-    "ServerTimeout": "00:03:00",
-    "SkipNegotiation": true,
-    "Transports": "WebSockets",
-    "UseAutomaticReconnect": true,
-    "UseStatefulReconnect": true
-  },
-  "AcBinaryHubProtocol": {
-    "ProtocolMode": "AsyncSegment",
-    "BufferSize": 4096,
-    "WaitForFlush": true,
-    "FlushTimeout": "00:00:10"
-  }
-}