Improve Home Assistant connection reliability

2026-07-27 16:23:40 -07:00
parent b7ec774efd
commit f3341ee064
16 changed files with 1696 additions and 697 deletions
--- a/README.md
+++ b/README.md
@@ -1,12 +1,42 @@
-XION Arcade WEMO-Enabled Control Panel
+XION Arcade Control Panel
 ================================================================================

-This is an iOS application designed for remote control of XION Arcade devices.
-The app is designed for XION but could work with any WEMO-enabled household by
-changing only one line of code.
+This is an iOS control panel for the XION/Xaibatsu arcade. It connects to Home
+Assistant's websocket API, displays entities with the `control_panel` label, and
+renders entities with the additional `control_panel_light` label in the lights
+section.

-The control panel is powered by the server-side client application called
-[Ouimeaux](http://ouimeaux.readthedocs.org). The application talks to any
-Ouimeaux server instance that is running and uses this to retrieve device
-information and to toggle devices on the network.
+Configuration
+--------------------------------------------------------------------------------

+The Home Assistant access token is intentionally not stored in source control.
+Provide it either through the `HOME_ASSISTANT_ACCESS_TOKEN` process environment
+variable or as the `HOME_ASSISTANT_ACCESS_TOKEN` Xcode build setting. The latter
+is expanded into the app's `HomeAssistantAccessToken` Info.plist entry.
+
+For a Simulator launch from the command line:
+
+```sh
+SIMCTL_CHILD_HOME_ASSISTANT_ACCESS_TOKEN='token' \
+  xcrun simctl launch booted com.zanneth.XIONControlPanel
+```
+
+The client disconnects cleanly when the app resigns active, reconnects and
+refreshes immediately when it returns, and uses Home Assistant `ping`/`pong`
+messages as a heartbeat while active.
+
+Testing
+--------------------------------------------------------------------------------
+
+The live integration test is opt-in because it briefly changes the `Asteroids`
+switch and restores its original state:
+
+```sh
+HOME_ASSISTANT_ACCESS_TOKEN='token' \
+RUN_LIVE_HOME_ASSISTANT_TESTS=1 \
+xcodebuild -project XIONControlPanel.xcodeproj \
+  -scheme XIONControlPanel \
+  -destination 'platform=iOS Simulator,name=iPhone 17' \
+  -only-testing:XIONControlPanelTests/HomeAssistantIntegrationTests \
+  test
+```
--- a/XIONControlPanel.xcodeproj/project.pbxproj
+++ b/XIONControlPanel.xcodeproj/project.pbxproj
@@ -43,8 +43,20 @@
 		CD815B96241DC44D00E2FA97 /* HubitatDevice.swift in Sources */ = {isa = PBXBuildFile; fileRef = CD815B95241DC44D00E2FA97 /* HubitatDevice.swift */; };
 		CDA64C242E03AE6400E9B07E /* HomeAssistantServer.swift in Sources */ = {isa = PBXBuildFile; fileRef = CDA64C232E03AE6100E9B07E /* HomeAssistantServer.swift */; };
 		CDA64C262E03EA1400E9B07E /* HomeAssistantDevice.swift in Sources */ = {isa = PBXBuildFile; fileRef = CDA64C252E03EA1000E9B07E /* HomeAssistantDevice.swift */; };
+		AA0000030000000000000000 /* HomeAssistantIntegrationTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = AA0000010000000000000000 /* HomeAssistantIntegrationTests.swift */; };
+		AA0000050000000000000000 /* XCTest.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = AA0000040000000000000000 /* XCTest.framework */; };
 /* End PBXBuildFile section */

+/* Begin PBXContainerItemProxy section */
+		AA00000B0000000000000000 /* PBXContainerItemProxy */ = {
+			isa = PBXContainerItemProxy;
+			containerPortal = 0C3CAE9C1C3350C800B856AD /* Project object */;
+			proxyType = 1;
+			remoteGlobalIDString = 0C3CAEA31C3350C800B856AD;
+			remoteInfo = XIONControlPanel;
+		};
+/* End PBXContainerItemProxy section */
+
 /* Begin PBXFileReference section */
 		0C20E2B51C33514100BA789B /* AppDelegate.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 		0C20E2BA1C33529700BA789B /* MainViewController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = MainViewController.swift; sourceTree = "<group>"; };
@@ -87,6 +99,9 @@
 		CD815B95241DC44D00E2FA97 /* HubitatDevice.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = HubitatDevice.swift; sourceTree = "<group>"; };
 		CDA64C232E03AE6100E9B07E /* HomeAssistantServer.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = HomeAssistantServer.swift; sourceTree = "<group>"; };
 		CDA64C252E03EA1000E9B07E /* HomeAssistantDevice.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = HomeAssistantDevice.swift; sourceTree = "<group>"; };
+		AA0000010000000000000000 /* HomeAssistantIntegrationTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = HomeAssistantIntegrationTests.swift; sourceTree = "<group>"; };
+		AA0000020000000000000000 /* XIONControlPanelTests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = XIONControlPanelTests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
+		AA0000040000000000000000 /* XCTest.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = XCTest.framework; path = System/Library/Frameworks/XCTest.framework; sourceTree = SDKROOT; };
 /* End PBXFileReference section */

 /* Begin PBXFrameworksBuildPhase section */
@@ -97,6 +112,14 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
+		AA0000080000000000000000 /* Frameworks */ = {
+			isa = PBXFrameworksBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				AA0000050000000000000000 /* XCTest.framework in Frameworks */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 /* End PBXFrameworksBuildPhase section */

 /* Begin PBXGroup section */
@@ -166,6 +189,7 @@
 			isa = PBXGroup;
 			children = (
 				0C3CAEA61C3350C800B856AD /* XIONControlPanel */,
+				AA0000060000000000000000 /* XIONControlPanelTests */,
 				0C3CAEA51C3350C800B856AD /* Products */,
 			);
 			sourceTree = "<group>";
@@ -174,6 +198,7 @@
 			isa = PBXGroup;
 			children = (
 				0C3CAEA41C3350C800B856AD /* XION.app */,
+				AA0000020000000000000000 /* XIONControlPanelTests.xctest */,
 			);
 			name = Products;
 			sourceTree = "<group>";
@@ -244,6 +269,14 @@
 			path = Servers;
 			sourceTree = "<group>";
 		};
+		AA0000060000000000000000 /* XIONControlPanelTests */ = {
+			isa = PBXGroup;
+			children = (
+				AA0000010000000000000000 /* HomeAssistantIntegrationTests.swift */,
+			);
+			path = XIONControlPanelTests;
+			sourceTree = "<group>";
+		};
 /* End PBXGroup section */

 /* Begin PBXNativeTarget section */
@@ -264,6 +297,24 @@
 			productReference = 0C3CAEA41C3350C800B856AD /* XION.app */;
 			productType = "com.apple.product-type.application";
 		};
+		AA00000A0000000000000000 /* XIONControlPanelTests */ = {
+			isa = PBXNativeTarget;
+			buildConfigurationList = AA00000F0000000000000000 /* Build configuration list for PBXNativeTarget "XIONControlPanelTests" */;
+			buildPhases = (
+				AA0000070000000000000000 /* Sources */,
+				AA0000080000000000000000 /* Frameworks */,
+				AA0000090000000000000000 /* Resources */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+				AA00000C0000000000000000 /* PBXTargetDependency */,
+			);
+			name = XIONControlPanelTests;
+			productName = XIONControlPanelTests;
+			productReference = AA0000020000000000000000 /* XIONControlPanelTests.xctest */;
+			productType = "com.apple.product-type.bundle.unit-test";
+		};
 /* End PBXNativeTarget section */

 /* Begin PBXProject section */
@@ -280,6 +331,12 @@
 						LastSwiftMigration = 1010;
 						ProvisioningStyle = Automatic;
 					};
+					AA00000A0000000000000000 = {
+						CreatedOnToolsVersion = 26.5;
+						DevelopmentTeam = DQQH5H6GBD;
+						ProvisioningStyle = Automatic;
+						TestTargetID = 0C3CAEA31C3350C800B856AD;
+					};
 				};
 			};
 			buildConfigurationList = 0C3CAE9F1C3350C800B856AD /* Build configuration list for PBXProject "XIONControlPanel" */;
@@ -297,6 +354,7 @@
 			projectRoot = "";
 			targets = (
 				0C3CAEA31C3350C800B856AD /* XIONControlPanel */,
+				AA00000A0000000000000000 /* XIONControlPanelTests */,
 			);
 		};
 /* End PBXProject section */
@@ -321,6 +379,13 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
+		AA0000090000000000000000 /* Resources */ = {
+			isa = PBXResourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 /* End PBXResourcesBuildPhase section */

 /* Begin PBXSourcesBuildPhase section */
@@ -355,8 +420,24 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
+		AA0000070000000000000000 /* Sources */ = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				AA0000030000000000000000 /* HomeAssistantIntegrationTests.swift in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 /* End PBXSourcesBuildPhase section */

+/* Begin PBXTargetDependency section */
+		AA00000C0000000000000000 /* PBXTargetDependency */ = {
+			isa = PBXTargetDependency;
+			target = 0C3CAEA31C3350C800B856AD /* XIONControlPanel */;
+			targetProxy = AA00000B0000000000000000 /* PBXContainerItemProxy */;
+		};
+/* End PBXTargetDependency section */
+
 /* Begin PBXVariantGroup section */
 		0C3CAEB01C3350C800B856AD /* LaunchScreen.storyboard */ = {
 			isa = PBXVariantGroup;
@@ -485,6 +566,7 @@
 				CURRENT_PROJECT_VERSION = 3;
 				DEVELOPMENT_TEAM = DQQH5H6GBD;
 				INFOPLIST_FILE = "$(SRCROOT)/XIONControlPanel/SupportingFiles/Info.plist";
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				MARKETING_VERSION = 2.0;
 				PRODUCT_BUNDLE_IDENTIFIER = com.zanneth.XIONControlPanel;
@@ -492,6 +574,7 @@
 				PROVISIONING_PROFILE = "";
 				PROVISIONING_PROFILE_SPECIFIER = "";
 				SWIFT_OBJC_BRIDGING_HEADER = "XIONControlPanel/SupportingFiles/XIONControlPanel-Bridging-Header.h";
+				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
@@ -507,6 +590,7 @@
 				CURRENT_PROJECT_VERSION = 3;
 				DEVELOPMENT_TEAM = DQQH5H6GBD;
 				INFOPLIST_FILE = "$(SRCROOT)/XIONControlPanel/SupportingFiles/Info.plist";
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				MARKETING_VERSION = 2.0;
 				PRODUCT_BUNDLE_IDENTIFIER = com.zanneth.XIONControlPanel;
@@ -519,6 +603,51 @@
 			};
 			name = Release;
 		};
+		AA00000D0000000000000000 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				BUNDLE_LOADER = "$(TEST_HOST)";
+				CLANG_ENABLE_MODULES = YES;
+				CODE_SIGN_STYLE = Automatic;
+				DEVELOPMENT_TEAM = DQQH5H6GBD;
+				GENERATE_INFOPLIST_FILE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+					"@loader_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = com.zanneth.XIONControlPanelTests;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/XION.app/$(BUNDLE_EXECUTABLE_FOLDER_PATH)/XION";
+			};
+			name = Debug;
+		};
+		AA00000E0000000000000000 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				BUNDLE_LOADER = "$(TEST_HOST)";
+				CLANG_ENABLE_MODULES = YES;
+				CODE_SIGN_STYLE = Automatic;
+				DEVELOPMENT_TEAM = DQQH5H6GBD;
+				GENERATE_INFOPLIST_FILE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+					"@loader_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = com.zanneth.XIONControlPanelTests;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/XION.app/$(BUNDLE_EXECUTABLE_FOLDER_PATH)/XION";
+			};
+			name = Release;
+		};
 /* End XCBuildConfiguration section */

 /* Begin XCConfigurationList section */
@@ -540,6 +669,15 @@
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Release;
 		};
+		AA00000F0000000000000000 /* Build configuration list for PBXNativeTarget "XIONControlPanelTests" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				AA00000D0000000000000000 /* Debug */,
+				AA00000E0000000000000000 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
 /* End XCConfigurationList section */
 	};
 	rootObject = 0C3CAE9C1C3350C800B856AD /* Project object */;
--- a/XIONControlPanel.xcodeproj/xcshareddata/xcschemes/XIONControlPanel.xcscheme
+++ b/XIONControlPanel.xcodeproj/xcshareddata/xcschemes/XIONControlPanel.xcscheme
@@ -0,0 +1,138 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "2650"
+   version = "1.7">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES"
+      buildArchitectures = "Automatic">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "0C3CAEA31C3350C800B856AD"
+               BuildableName = "XION.app"
+               BlueprintName = "XIONControlPanel"
+               ReferencedContainer = "container:XIONControlPanel.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "NO"
+            buildForProfiling = "NO"
+            buildForArchiving = "NO"
+            buildForAnalyzing = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "AA00000A0000000000000000"
+               BuildableName = "XIONControlPanelTests.xctest"
+               BlueprintName = "XIONControlPanelTests"
+               ReferencedContainer = "container:XIONControlPanel.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      shouldAutocreateTestPlan = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "0C3CAEA31C3350C800B856AD"
+            BuildableName = "XION.app"
+            BlueprintName = "XIONControlPanel"
+            ReferencedContainer = "container:XIONControlPanel.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <Testables>
+         <TestableReference
+            skipped = "NO"
+            parallelizable = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "AA00000A0000000000000000"
+               BuildableName = "XIONControlPanelTests.xctest"
+               BlueprintName = "XIONControlPanelTests"
+               ReferencedContainer = "container:XIONControlPanel.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+      <EnvironmentVariables>
+         <EnvironmentVariable
+            key = "HOME_ASSISTANT_ACCESS_TOKEN"
+            value = "$(HOME_ASSISTANT_ACCESS_TOKEN)"
+            isEnabled = "YES">
+         </EnvironmentVariable>
+         <EnvironmentVariable
+            key = "RUN_LIVE_HOME_ASSISTANT_TESTS"
+            value = "$(RUN_LIVE_HOME_ASSISTANT_TESTS)"
+            isEnabled = "YES">
+         </EnvironmentVariable>
+      </EnvironmentVariables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "0C3CAEA31C3350C800B856AD"
+            BuildableName = "XION.app"
+            BlueprintName = "XIONControlPanel"
+            ReferencedContainer = "container:XIONControlPanel.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+      <EnvironmentVariables>
+         <EnvironmentVariable
+            key = "HOME_ASSISTANT_ACCESS_TOKEN"
+            value = "$(HOME_ASSISTANT_ACCESS_TOKEN)"
+            isEnabled = "YES">
+         </EnvironmentVariable>
+         <EnvironmentVariable
+            key = "RUN_LIVE_HOME_ASSISTANT_TESTS"
+            value = "$(RUN_LIVE_HOME_ASSISTANT_TESTS)"
+            isEnabled = "YES">
+         </EnvironmentVariable>
+      </EnvironmentVariables>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "0C3CAEA31C3350C800B856AD"
+            BuildableName = "XION.app"
+            BlueprintName = "XIONControlPanel"
+            ReferencedContainer = "container:XIONControlPanel.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>
--- a/XIONControlPanel/Application/AppDelegate.swift
+++ b/XIONControlPanel/Application/AppDelegate.swift
@@ -17,7 +17,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate
    func application(_ application: UIApplication,
                     didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool
    {
-        self.window = UIWindow(frame: UIScreen.main.bounds)
+        self.window = UIWindow()
        self.window?.rootViewController = self.mainViewController
        self.window?.makeKeyAndVisible()
        
@@ -26,12 +26,17 @@ class AppDelegate: UIResponder, UIApplicationDelegate
    
    func applicationDidBecomeActive(_ application: UIApplication)
    {
-        self.mainViewController.viewDidAppear(false)
+        mainViewController.applicationDidBecomeActive()
+    }
+
+    func applicationWillResignActive(_ application: UIApplication)
+    {
+        mainViewController.applicationWillResignActive()
    }
    
    func applicationDidEnterBackground(_ application: UIApplication)
    {
-        self.mainViewController.viewDidDisappear(false)
+        mainViewController.applicationWillResignActive()
    }
    
    func application(_ application: UIApplication,
--- a/XIONControlPanel/Controllers/MainViewController.swift
+++ b/XIONControlPanel/Controllers/MainViewController.swift
@@ -13,7 +13,9 @@ class MainViewController: UIViewController, SwitchesViewControllerDelegate, Serv
    fileprivate var _serverMultiplex:           ServerMultiplex = ServerMultiplex()
    fileprivate var _visualizationController:   VisualizationViewController = VisualizationViewController()
    fileprivate var _headerView:                HeaderView = HeaderView()
-    fileprivate var _updateDevices:             Bool = false
+    fileprivate var _refreshTimer:              Timer?
+    fileprivate var _isApplicationActive:       Bool = false
+    fileprivate var _isViewVisible:             Bool = false
    
    fileprivate var _switchesController: SwitchesViewController = SwitchesViewController()
    fileprivate var _lightsController: SwitchesViewController = SwitchesViewController()
@@ -58,6 +60,7 @@ class MainViewController: UIViewController, SwitchesViewControllerDelegate, Serv
        self.view.addSubview(_headerView)
        
        _updateConnectivityStatus(.disconnected)
+        _updateSizeClassPresentation()
    }
    
    override func viewDidLayoutSubviews()
@@ -80,6 +83,7 @@ class MainViewController: UIViewController, SwitchesViewControllerDelegate, Serv
        
        _headerView.frame = headerBounds
        
+        if _visualizationShouldBeVisible() {
            let visualizationFrame = CGRect(
                x: bodyBounds.origin.x,
                y: bodyBounds.origin.y,
@@ -94,47 +98,53 @@ class MainViewController: UIViewController, SwitchesViewControllerDelegate, Serv
                width: visualizationFrame.width,
                height: bodyBounds.height - visualizationFrame.height
            )
-        _lightsController.view.frame = lightsControllerFrame.insetBy(dx: 18.0, dy: 0.0)
+            _lightsController.view.frame = lightsControllerFrame.insetBy(
+                dx: 18.0,
+                dy: 0.0
+            )

-        var switchesOriginX: CGFloat = 0.0
-        var switchesWidth: CGFloat = 0.0
-        if (_visualizationShouldBeVisible()) {
-            switchesOriginX = visualizationFrame.maxX
-            switchesWidth = bodyBounds.size.width - visualizationFrame.size.width
+            _switchesController.view.frame = CGRect(
+                x: visualizationFrame.maxX,
+                y: bodyBounds.origin.y,
+                width: bodyBounds.width - visualizationFrame.width,
+                height: bodyBounds.height
+            )
        } else {
-            switchesOriginX = 0.0
-            switchesWidth = bodyBounds.size.width
+            let sectionSpacing: CGFloat = 8
+            let switchesHeight = rint(bodyBounds.height * 0.68)
+
+            _visualizationController.view.frame = .zero
+            _switchesController.view.frame = CGRect(
+                x: bodyBounds.minX,
+                y: bodyBounds.minY,
+                width: bodyBounds.width,
+                height: switchesHeight
+            )
+            _lightsController.view.frame = CGRect(
+                x: bodyBounds.minX + sectionSpacing,
+                y: bodyBounds.minY + switchesHeight + sectionSpacing,
+                width: bodyBounds.width - (sectionSpacing * 2),
+                height: bodyBounds.height - switchesHeight - sectionSpacing
+            )
        }

-        let switchesControllerFrame = CGRect(
-            x: switchesOriginX,
-            y: bodyBounds.origin.y,
-            width: switchesWidth,
-            height: bodyBounds.size.height
-        )
-        _switchesController.view.frame = switchesControllerFrame
+        _updateSizeClassPresentation()
    }
    
    override func viewDidAppear(_ animated: Bool)
    {
        super.viewDidAppear(animated)

-        UIApplication.shared.isIdleTimerDisabled = true
-        
-        _headerView.xionLogoView.beginAnimating()
-        
-        if _serverMultiplex.devices.count == 0 {
-            // Do initial refresh
-            _updateConnectivityStatus(.connecting)
-            _serverMultiplex.refreshDevices()
-            _startUpdatingDevices()
-        }
+        _isViewVisible = true
+        _updateActiveState()
    }
    
    override func viewDidDisappear(_ animated: Bool)
    {
        super.viewDidDisappear(animated)
-        UIApplication.shared.isIdleTimerDisabled = false
+
+        _isViewVisible = false
+        _updateActiveState()
    }
    
    override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator)
@@ -155,7 +165,21 @@ class MainViewController: UIViewController, SwitchesViewControllerDelegate, Serv
        _updateVisualization(true)
        
        for device in devices {
-            _serverMultiplex.toggleDeviceState(device, state: device.state, completion: { (error: Error?) -> Void in })
+            _serverMultiplex.toggleDeviceState(
+                device,
+                state: device.state
+            ) { [weak self] error in
+                guard let error else { return }
+
+                DispatchQueue.main.async {
+                    guard let self else { return }
+                    self._updateConnectivityStatus(.error)
+                    self._serverMultiplex.refreshDevices()
+
+                    var stderr = StandardErrorOutputStream()
+                    print(error.localizedDescription, to: &stderr)
+                }
+            }
        }
    }
    
@@ -200,22 +224,41 @@ class MainViewController: UIViewController, SwitchesViewControllerDelegate, Serv
        }
    }
    
-    internal func _startUpdatingDevices()
+    internal func applicationDidBecomeActive()
    {
-        _updateDevices = true
-        
-        let interval = DispatchTime.now() + Double(Int64(10 * Double(NSEC_PER_SEC))) / Double(NSEC_PER_SEC)
-        DispatchQueue.main.asyncAfter(deadline: interval) { () -> Void in
-            if (self._updateDevices) {
-                self._serverMultiplex.refreshDevices()
-                self._startUpdatingDevices()
-            }
-        }
+        _isApplicationActive = true
+        _updateActiveState()
    }

-    internal func _stopUpdatingDevices()
+    internal func applicationWillResignActive()
    {
-        _updateDevices = false
+        _isApplicationActive = false
+        _updateActiveState()
+    }
+
+    private func _updateActiveState()
+    {
+        let shouldBeActive = _isApplicationActive && _isViewVisible
+
+        if shouldBeActive, _refreshTimer == nil {
+            UIApplication.shared.isIdleTimerDisabled = true
+            _headerView.xionLogoView.beginAnimating()
+            _updateConnectivityStatus(.connecting)
+            _serverMultiplex.refreshDevices()
+
+            let timer = Timer(timeInterval: 10, repeats: true) { [weak self] _ in
+                self?._serverMultiplex.refreshDevices()
+            }
+            RunLoop.main.add(timer, forMode: .common)
+            _refreshTimer = timer
+        } else if !shouldBeActive, _refreshTimer != nil {
+            _refreshTimer?.invalidate()
+            _refreshTimer = nil
+            _serverMultiplex.disconnect()
+            _updateConnectivityStatus(.disconnected)
+            _headerView.xionLogoView.stopAnimating()
+            UIApplication.shared.isIdleTimerDisabled = false
+        }
    }
    
    // MARK: Server Multiplex Delegate
@@ -232,6 +275,7 @@ class MainViewController: UIViewController, SwitchesViewControllerDelegate, Serv
    {
        _switchesController.devicesStateChanged(devices.switches)
        _lightsController.devicesStateChanged(devices.lights)
+        _updateVisualization(true)
    }
    
    func serverMultiplex(_ multiplex: ServerMultiplex, didReceiveAcknowledgementFromServer server: Server)
@@ -241,6 +285,11 @@ class MainViewController: UIViewController, SwitchesViewControllerDelegate, Serv
        _updateConnectivityStatus(groupConnectionStatus)
    }

+    func serverMultiplexConnectionStatusDidChange(_ multiplex: ServerMultiplex)
+    {
+        _updateConnectivityStatus(multiplex.groupConnectionStatus())
+    }
+    
    func serverMultiplex(_ multiplex: ServerMultiplex, didEncounterError error: Error)
    {
        _updateConnectivityStatus(.error)
--- a/XIONControlPanel/Controllers/SwitchesViewController.swift
+++ b/XIONControlPanel/Controllers/SwitchesViewController.swift
@@ -10,7 +10,7 @@ import Darwin
 import Foundation
 import UIKit

-protocol SwitchesViewControllerDelegate: class
+protocol SwitchesViewControllerDelegate: AnyObject
 {
    func switchesViewControllerDidToggleDevices(_ controller: SwitchesViewController, devices: [AnyDevice])
 }
@@ -29,9 +29,8 @@ class SwitchesViewController: UIViewController,
    fileprivate var _collectionView: UICollectionView = UICollectionView(frame: CGRect.zero,
                                                                         collectionViewLayout: UICollectionViewFlowLayout())
    
-    fileprivate var _collectionViewDataSource: UICollectionViewDiffableDataSource<Int, Int>!
-    
-    fileprivate var _currentDevicesHash: Int = 0
+    fileprivate var _collectionViewDataSource:
+        UICollectionViewDiffableDataSource<Int, ItemIdentifier>!
    
    fileprivate let _label = UILabel(frame: .zero)
    
@@ -42,7 +41,7 @@ class SwitchesViewController: UIViewController,
    static fileprivate let actionCellsSectionIdentifier = 0
    static fileprivate let switchCellsSectionIdentifier = 1
    
-    fileprivate enum ActionCell: Int, CaseIterable
+    fileprivate enum ActionCell: Int, CaseIterable, Hashable
    {
        case allOn
        case allOff
@@ -60,6 +59,12 @@ class SwitchesViewController: UIViewController,
        static let count: Int = { return ActionCell.allCases.count }()
    }

+    fileprivate enum ItemIdentifier: Hashable
+    {
+        case action(ActionCell)
+        case device(String)
+    }
+    
    public enum ActionCellLayout
    {
        case horizontal
@@ -85,8 +90,8 @@ class SwitchesViewController: UIViewController,
        
        // Action cells
        snapshot.appendItems([
-            SwitchesViewController.ActionCell.allOn.rawValue,
-            SwitchesViewController.ActionCell.allOff.rawValue
+            .action(.allOn),
+            .action(.allOff)
        ], toSection: SwitchesViewController.actionCellsSectionIdentifier)
        
        _collectionViewDataSource.apply(snapshot, animatingDifferences: false)
@@ -158,7 +163,10 @@ class SwitchesViewController: UIViewController,
            
            var snapshot = _collectionViewDataSource.snapshot()
            snapshot.deleteItems(snapshot.itemIdentifiers(inSection: SwitchesViewController.switchCellsSectionIdentifier))
-            snapshot.appendItems(self.devices.map { $0.hashValue }, toSection: SwitchesViewController.switchCellsSectionIdentifier)
+            snapshot.appendItems(
+                self.devices.map { .device($0.serial) },
+                toSection: SwitchesViewController.switchCellsSectionIdentifier
+            )
            snapshot.reloadSections([Self.actionCellsSectionIdentifier])
            _collectionViewDataSource.apply(snapshot, animatingDifferences: false)
        }
@@ -168,9 +176,14 @@ class SwitchesViewController: UIViewController,
    {
        var snapshot = _collectionViewDataSource.snapshot()
        changedDevices.forEach { changedDevice in
-            if let existingDevice = (self.devices.first { $0.hashValue == changedDevice.hashValue }) {
+            if let existingDevice = self.devices.first(where: {
+                $0.serial == changedDevice.serial
+            }) {
                existingDevice.state = changedDevice.state
-                snapshot.reloadItems([ existingDevice.hashValue ])
+                let identifier = ItemIdentifier.device(existingDevice.serial)
+                if snapshot.indexOfItem(identifier) != nil {
+                    snapshot.reloadItems([identifier])
+                }
            }
        }
        
@@ -179,29 +192,36 @@ class SwitchesViewController: UIViewController,
    
    // MARK: UICollectionView
    
-    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath, identifier: Int) -> UICollectionViewCell?
+    fileprivate func collectionView(
+        _ collectionView: UICollectionView,
+        cellForItemAt indexPath: IndexPath,
+        identifier: ItemIdentifier
+    ) -> UICollectionViewCell?
    {
-        if (indexPath.section == SwitchesViewController.actionCellsSectionIdentifier) {
+        switch identifier {
+        case .action(let action):
            let reuseID = SwitchesViewController.collectionViewActionCellReuseIdentifier
            let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseID, for: indexPath) as! WemoActionCellView
-            cell.textLabel.text = ActionCell(rawValue: identifier)?.name().uppercased()
+            cell.textLabel.text = action.name().uppercased()
+            cell.accessibilityIdentifier = "action.\(action.rawValue)"
+            cell.accessibilityLabel = action.name()
            cell.enabled = (self.devices.count > 0)
            
            return cell
-        } else if (indexPath.section == SwitchesViewController.switchCellsSectionIdentifier) {
+
+        case .device(let serial):
            let reuseID = SwitchesViewController.collectionViewDeviceSwitchCellReuseIdentifier
            let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseID, for: indexPath) as! WemoDeviceCellView
            
-            if let device = (self.devices.first { $0.hashValue == identifier }) {
+            if let device = self.devices.first(where: { $0.serial == serial }) {
                cell.deviceName = device.name
                cell.toggled = (device.state == .on)
                cell.ordinal = indexPath.row
+                cell.accessibilityIdentifier = "device.\(device.serial)"
            }
            
            return cell
        }
-        
-        return nil
    }
    
    func collectionView(_ collectionView: UICollectionView,
@@ -252,9 +272,12 @@ class SwitchesViewController: UIViewController,
    
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath)
    {
-        if (indexPath.section == SwitchesViewController.actionCellsSectionIdentifier) {
-            let tappedActionCell = ActionCell(rawValue: indexPath.item)
+        guard let identifier = _collectionViewDataSource.itemIdentifier(for: indexPath) else {
+            return
+        }

+        switch identifier {
+        case .action(let tappedActionCell):
            for cell in collectionView.visibleCells {
                if collectionView.indexPath(for: cell)?.section == SwitchesViewController.switchCellsSectionIdentifier {
                    let switchCell = cell as! WemoDeviceCellView
@@ -272,13 +295,17 @@ class SwitchesViewController: UIViewController,
            }
            
            self.delegate?.switchesViewControllerDidToggleDevices(self, devices: self.devices)
-        } else if (indexPath.section == SwitchesViewController.switchCellsSectionIdentifier) {
-            let cell = collectionView.cellForItem(at: indexPath) as! WemoDeviceCellView
+
+        case .device(let serial):
+            guard
+                let cell = collectionView.cellForItem(at: indexPath) as? WemoDeviceCellView,
+                let device = self.devices.first(where: { $0.serial == serial })
+            else {
+                return
+            }
+
            cell.toggled = !cell.toggled
-            
-            let device = self.devices[indexPath.row]
            device.state = (cell.toggled ? .on : .off)
-            
            self.delegate?.switchesViewControllerDidToggleDevices(self, devices: [device])
        }
    }
--- a/XIONControlPanel/Controllers/VisualizationViewController.swift
+++ b/XIONControlPanel/Controllers/VisualizationViewController.swift
@@ -11,7 +11,6 @@ import Foundation
 import GLKit
 import SceneKit
 import UIKit
-import SceneKit

 let π = CGFloat(Double.pi)

@@ -39,7 +38,7 @@ class VisualizationViewController: UIViewController, SCNSceneRendererDelegate
    override func loadView()
    {
        let opts = [SCNView.Option.preferredRenderingAPI.rawValue : SCNRenderingAPI.openGLES2.rawValue]
-        let view = SCNView(frame: UIScreen.main.bounds, options: opts)
+        let view = SCNView(frame: .zero, options: opts)
        view.backgroundColor = UIColor.black
        view.scene = _scene
        view.allowsCameraControl = false
--- a/XIONControlPanel/Models/DeviceProtocol.swift
+++ b/XIONControlPanel/Models/DeviceProtocol.swift
@@ -35,14 +35,12 @@ extension Device where Self: Hashable
 {
    func hash(into hasher: inout Hasher)
    {
-        hasher.combine(self.name)
-        hasher.combine(self.type)
        hasher.combine(self.serial)
    }
    
    static func == (lhs: Self, rhs: Self) -> Bool
    {
-        return lhs.name == rhs.name && lhs.serial == rhs.serial
+        return lhs.serial == rhs.serial
    }
 }

--- a/XIONControlPanel/Models/HubitatDevice.swift
+++ b/XIONControlPanel/Models/HubitatDevice.swift
@@ -43,7 +43,10 @@ extension HubitatDevice : Decodable
        
        name = try values.decode(String.self, forKey: .name)
        
-        let attributes = try values.nestedContainer(keyedBy: Self.AttributesKeys, forKey: .attributes)
+        let attributes = try values.nestedContainer(
+            keyedBy: Self.AttributesKeys.self,
+            forKey: .attributes
+        )
        state = try attributes.decode(DeviceState.self, forKey: .switch)
    }
 }
--- a/XIONControlPanel/Servers/HomeAssistantServer.swift
+++ b/XIONControlPanel/Servers/HomeAssistantServer.swift
--- a/XIONControlPanel/Servers/ServerMultiplex.swift
+++ b/XIONControlPanel/Servers/ServerMultiplex.swift
@@ -8,11 +8,12 @@

 import Foundation

-protocol ServerMultiplexDelegate
+protocol ServerMultiplexDelegate: AnyObject
 {
    func serverMultiplex(_ multiplex: ServerMultiplex, didAddDevices devices: [AnyDevice])
    func serverMultiplex(_ multiplex: ServerMultiplex, devicesStateChanged devices: [AnyDevice])
    func serverMultiplex(_ multiplex: ServerMultiplex, didReceiveAcknowledgementFromServer server: Server)
+    func serverMultiplexConnectionStatusDidChange(_ multiplex: ServerMultiplex)
    func serverMultiplex(_ multiplex: ServerMultiplex, didEncounterError error: Error)
 }

@@ -23,10 +24,11 @@ enum ServerMultiplexError : Error

 class ServerMultiplex
 {
-    public var delegate: ServerMultiplexDelegate?
+    public weak var delegate: ServerMultiplexDelegate?
    public private(set) var devices = Set<AnyDevice>()
    
    private var servers: [Server] = []
+    private var devicesByServer: [ObjectIdentifier: Set<AnyDevice>] = [:]
    public var numServers: Int { return servers.count }
    
    public func addServer(_ server: Server)
@@ -73,17 +75,27 @@ class ServerMultiplex
    
    public func refreshDevices()
    {
-        self.servers.forEach { server in
+        servers.forEach { server in
            server.connect { error in
                if let error {
                    print("Multiplexer: error connecting server \(server): \(error)")
+                    self.handleError(forServer: server, error: error)
+                }
+            }
+
+            server.fetchDevices { (result: Result<[AnyDevice], Error>) in
+                self.handleServerFetchResult(forServer: server, result: result)
            }
        }
    }

-        self.servers.forEach { (server: Server) in
-            server.fetchDevices { (result: Result<[AnyDevice], Error>) in
-                self.handleServerFetchResult(forServer: server, result: result)
+    public func disconnect()
+    {
+        servers.forEach { server in
+            server.disconnect { error in
+                if let error {
+                    self.handleError(forServer: server, error: error)
+                }
            }
        }
    }
@@ -93,11 +105,13 @@ extension ServerMultiplex
 {
    private func handleServerFetchResult(forServer server: Server, result: Result<[AnyDevice], Error>)
    {
+        DispatchQueue.main.async {
            switch result {
            case .success(let devices):
-            handleDevicesChanged(forServer: server, devicesChanged: devices)
+                self.handleDevicesChanged(forServer: server, devicesChanged: devices)
            case .failure(let error):
-            handleError(forServer: server, error: error)
+                self.handleError(forServer: server, error: error)
+            }
        }
    }
    
@@ -107,28 +121,29 @@ extension ServerMultiplex
        self.delegate?.serverMultiplex(self, didReceiveAcknowledgementFromServer: server)
        
        // Then, optionally notify about new devices or device state changes
+        let serverID = ObjectIdentifier(server)
+        let previousDevices = devicesByServer[serverID] ?? []
        let newDevicesSet = Set<AnyDevice>(devicesChanged)
-        let additions = newDevicesSet.subtracting(self.devices)
+        let additions = newDevicesSet.subtracting(previousDevices)
+        let removals = previousDevices.subtracting(newDevicesSet)
        let changed = newDevicesSet.filter { (device: AnyDevice) in
-            if let existing = (devices.first { $0.hashValue == device.hashValue }) {
+            if let existing = previousDevices.first(where: { $0.serial == device.serial }) {
                return existing.state != device.state
            }
            
            return false
        }

-        self.devices = self.devices.union(newDevicesSet)
+        devicesByServer[serverID] = newDevicesSet
+        devices.subtract(previousDevices)
+        devices.formUnion(newDevicesSet)

-        if additions.count > 0 {
-            DispatchQueue.main.async {
-                self.delegate?.serverMultiplex(self, didAddDevices: Array(additions))
-            }
+        if !additions.isEmpty || !removals.isEmpty {
+            delegate?.serverMultiplex(self, didAddDevices: Array(additions))
        }
        
-        if changed.count > 0 {
-            DispatchQueue.main.async {
-                self.delegate?.serverMultiplex(self, devicesStateChanged: Array(changed))
-            }
+        if !changed.isEmpty {
+            delegate?.serverMultiplex(self, devicesStateChanged: Array(changed))
        }
    }
    
@@ -143,9 +158,21 @@ extension ServerMultiplex
 extension ServerMultiplex: ServerDelegate
 {
    func server(_ server: any Server, deviceChangedState subjectDevice: AnyDevice) {
-        guard let device = devices.first(where: { $0.serial == subjectDevice.serial }) else { return }
-        device.state = subjectDevice.state
+        DispatchQueue.main.async {
+            guard let device = self.devices.first(where: {
+                $0.serial == subjectDevice.serial
+            }) else {
+                return
+            }

-        delegate?.serverMultiplex(self, devicesStateChanged: [device])
+            device.state = subjectDevice.state
+            self.delegate?.serverMultiplex(self, devicesStateChanged: [device])
+        }
+    }
+
+    func server(_ server: any Server, connectionStatusChanged status: ConnectionStatus) {
+        DispatchQueue.main.async {
+            self.delegate?.serverMultiplexConnectionStatusDidChange(self)
+        }
    }
 }
--- a/XIONControlPanel/Servers/ServerProtocol.swift
+++ b/XIONControlPanel/Servers/ServerProtocol.swift
@@ -8,7 +8,7 @@

 import Foundation

-enum ConnectionStatus
+enum ConnectionStatus: Equatable
 {
    case disconnected
    case connecting
@@ -19,6 +19,7 @@ enum ConnectionStatus
 protocol ServerDelegate: AnyObject
 {
    func server(_ server: Server, deviceChangedState: AnyDevice)
+    func server(_ server: Server, connectionStatusChanged status: ConnectionStatus)
 }

 protocol Server: AnyObject
@@ -44,4 +45,3 @@ protocol Server: AnyObject
    /// Returns true if this is a device this server is responsible for
    func responsibleForDevice(_ device: AnyDevice) -> Bool
 }
-
--- a/XIONControlPanel/Servers/WemoServer.swift
+++ b/XIONControlPanel/Servers/WemoServer.swift
@@ -42,9 +42,8 @@ class WemoServer : Server
            self.connectionStatus = .connecting
            
            let op = ConnectOperation(baseURL: self.baseURL, session: _urlSession)
-            weak var weakOp = op
-            op.completionBlock = {
-                guard let strongOp = weakOp else { completion(nil) ; return }
+            op.completionBlock = { [weak op] in
+                guard let strongOp = op else { completion(nil) ; return }
                if let error = strongOp.error {
                    self._logError("Error connecting to server", error: error)
                    self.connectionStatus = .disconnected
@@ -69,12 +68,16 @@ class WemoServer : Server
    func fetchDevices(_ completion: @escaping (Result<[AnyDevice], Error>) -> Void)
    {
        let op = FetchDevicesOperation(baseURL: self.baseURL, session: _urlSession)
-        op.completionBlock = { [unowned op] in
+        op.completionBlock = { [weak op] in
+            guard let op else {
+                completion(.failure(ConnectionError.unknown))
+                return
+            }
+
            if let error = op.error {
                self._logError("Error fetching devices", error: error)
                completion(.failure(error))
-            } else {
-                self.devices = op.devices
+                return
            }

            self.devices = op.devices
@@ -98,9 +101,8 @@ class WemoServer : Server
    {
        if connectionStatus == .connected, let device = findDevice(device) {
            let op = ToggleDeviceOperation(baseURL: self.baseURL, session: _urlSession, device: device, state: state)
-            weak var weakOp = op
-            op.completionBlock = {
-                guard let strongOp = weakOp else { completion(nil) ; return }
+            op.completionBlock = { [weak op] in
+                guard let strongOp = op else { completion(nil) ; return }
                if let error = strongOp.error {
                    self._logError("Error toggling device", error: error)
                }
@@ -132,7 +134,7 @@ class WemoServer : Server
    }
 }

-internal class WemoOperation : Operation
+internal class WemoOperation : Operation, @unchecked Sendable
 {
    var baseURL:   URL
    var session:   URLSession
@@ -146,7 +148,7 @@ internal class WemoOperation : Operation
    }
 }

-internal class ConnectOperation : WemoOperation
+internal class ConnectOperation : WemoOperation, @unchecked Sendable
 {
    override func main()
    {
@@ -164,7 +166,7 @@ internal class ConnectOperation : WemoOperation
    }
 }

-internal class FetchDevicesOperation : WemoOperation
+internal class FetchDevicesOperation : WemoOperation, @unchecked Sendable
 {
    private(set) var devices: [WemoDevice] = []
    
@@ -201,7 +203,7 @@ internal class FetchDevicesOperation : WemoOperation
    }
 }

-internal class ToggleDeviceOperation : WemoOperation
+internal class ToggleDeviceOperation : WemoOperation, @unchecked Sendable
 {
    var device: WemoDevice
    var state:  DeviceState
--- a/XIONControlPanel/SupportingFiles/Info.plist
+++ b/XIONControlPanel/SupportingFiles/Info.plist
@@ -20,6 +20,8 @@
 	<string>????</string>
 	<key>CFBundleVersion</key>
 	<string>$(CURRENT_PROJECT_VERSION)</string>
+	<key>HomeAssistantAccessToken</key>
+	<string>$(HOME_ASSISTANT_ACCESS_TOKEN)</string>
 	<key>LSRequiresIPhoneOS</key>
 	<true/>
 	<key>NSAppTransportSecurity</key>
--- a/XIONControlPanel/Views/WemoCellView.swift
+++ b/XIONControlPanel/Views/WemoCellView.swift
@@ -19,6 +19,7 @@ open class WemoCellView: UICollectionViewCell
    {
        super.init(frame: frame)
        
+        isAccessibilityElement = true
        self.contentView.backgroundColor = WemoCellView.disabledBackgroundColor
        
        _selectionOverlayView.backgroundColor = UIColor.clear
@@ -130,6 +131,7 @@ open class WemoDeviceCellView: WemoCellView
        didSet
        {
            _nameLabel.text = self.deviceName.uppercased()
+            accessibilityLabel = deviceName
            self.setNeedsLayout()
        }
    }
@@ -154,6 +156,8 @@ open class WemoDeviceCellView: WemoCellView
        didSet
        {
            _indicator.status = toggled
+            accessibilityValue = toggled ? "On" : "Off"
+            accessibilityTraits = toggled ? [.button, .selected] : .button
            
            if (toggled) {
                self.contentView.backgroundColor = WemoCellView.enabledBackgroundColor
@@ -176,6 +180,7 @@ open class WemoActionCellView: WemoCellView
    {
        super.init(frame: frame)
        
+        accessibilityTraits = .button
        self.textLabel.font = UIFont(name: "Orbitron-Medium", size: 21.0)
        self.textLabel.textColor = UIColor.white
        self.textLabel.textAlignment = .center
--- a/XIONControlPanelTests/HomeAssistantIntegrationTests.swift
+++ b/XIONControlPanelTests/HomeAssistantIntegrationTests.swift
@@ -0,0 +1,184 @@
+import XCTest
+@testable import XION
+
+final class HomeAssistantIntegrationTests: XCTestCase, ServerDelegate
+{
+    private var expectedEntityID: String?
+    private var expectedState: DeviceState?
+    private var stateExpectation: XCTestExpectation?
+    private var connectionErrorExpectation: XCTestExpectation?
+    private var reconnectionExpectation: XCTestExpectation?
+
+    @MainActor
+    func testLiveAsteroidsRoundTrip() async throws
+    {
+        guard ProcessInfo.processInfo.environment["RUN_LIVE_HOME_ASSISTANT_TESTS"] == "1" else {
+            throw XCTSkip("Set RUN_LIVE_HOME_ASSISTANT_TESTS=1 to run live integration tests.")
+        }
+        guard
+            let token = ProcessInfo.processInfo.environment["HOME_ASSISTANT_ACCESS_TOKEN"],
+            !token.isEmpty
+        else {
+            XCTFail("HOME_ASSISTANT_ACCESS_TOKEN is required for the live test.")
+            return
+        }
+
+        let server = HomeAssistantServer(URL(string: "https://ha.xaibatsu.com/api")!)
+        server.delegate = self
+
+        try await connect(server)
+        let devices = try await fetchDevices(from: server)
+        guard let asteroids = devices.first(where: {
+            $0.name.caseInsensitiveCompare("Asteroids") == .orderedSame
+        }) else {
+            server.disconnect { _ in }
+            XCTFail("The Home Assistant response did not include Asteroids.")
+            return
+        }
+
+        let originalState = asteroids.state
+        let testState: DeviceState = originalState == .on ? .off : .on
+        var restorationRequired = false
+
+        do {
+            restorationRequired = true
+            try await toggle(
+                asteroids,
+                to: testState,
+                using: server,
+                expectationDescription: "Asteroids changed to \(testState.rawValue)"
+            )
+
+            try await toggle(
+                asteroids,
+                to: originalState,
+                using: server,
+                expectationDescription: "Asteroids restored to \(originalState.rawValue)"
+            )
+            restorationRequired = false
+
+            let connectionError = expectation(
+                description: "The simulated socket failure was detected"
+            )
+            let reconnection = expectation(
+                description: "The server reconnected after the socket failure"
+            )
+            connectionErrorExpectation = connectionError
+            reconnectionExpectation = reconnection
+            server.simulateConnectionFailureForTesting()
+            await fulfillment(
+                of: [connectionError, reconnection],
+                timeout: 8,
+                enforceOrder: true
+            )
+
+            for _ in 0..<3 {
+                server.disconnect { error in
+                    XCTAssertNil(error)
+                }
+                try await connect(server)
+            }
+
+            let reconnectedDevices = try await fetchDevices(from: server)
+            XCTAssertEqual(
+                reconnectedDevices.first(where: { $0.serial == asteroids.serial })?.state,
+                originalState
+            )
+        } catch {
+            if restorationRequired {
+                try? await toggleWithoutWaiting(asteroids, to: originalState, using: server)
+            }
+            server.disconnect { _ in }
+            throw error
+        }
+
+        server.disconnect { error in
+            XCTAssertNil(error)
+        }
+        XCTAssertEqual(server.connectionStatus, .disconnected)
+    }
+
+    func server(_ server: Server, deviceChangedState device: AnyDevice)
+    {
+        guard
+            device.serial == expectedEntityID,
+            device.state == expectedState
+        else {
+            return
+        }
+
+        stateExpectation?.fulfill()
+        stateExpectation = nil
+    }
+
+    func server(_ server: Server, connectionStatusChanged status: ConnectionStatus)
+    {
+        if status == .error {
+            connectionErrorExpectation?.fulfill()
+            connectionErrorExpectation = nil
+        } else if status == .connected, connectionErrorExpectation == nil {
+            reconnectionExpectation?.fulfill()
+            reconnectionExpectation = nil
+        }
+    }
+
+    @MainActor
+    private func connect(_ server: HomeAssistantServer) async throws
+    {
+        try await withCheckedThrowingContinuation {
+            (continuation: CheckedContinuation<Void, Error>) in
+            server.connect { error in
+                if let error {
+                    continuation.resume(throwing: error)
+                } else {
+                    continuation.resume()
+                }
+            }
+        }
+    }
+
+    @MainActor
+    private func fetchDevices(from server: HomeAssistantServer) async throws -> [AnyDevice]
+    {
+        try await withCheckedThrowingContinuation { continuation in
+            server.fetchDevices { result in
+                continuation.resume(with: result)
+            }
+        }
+    }
+
+    @MainActor
+    private func toggle(
+        _ device: AnyDevice,
+        to state: DeviceState,
+        using server: HomeAssistantServer,
+        expectationDescription: String
+    ) async throws {
+        expectedEntityID = device.serial
+        expectedState = state
+        let expectation = expectation(description: expectationDescription)
+        stateExpectation = expectation
+
+        try await toggleWithoutWaiting(device, to: state, using: server)
+        await fulfillment(of: [expectation], timeout: 10)
+        XCTAssertEqual(device.state, state)
+    }
+
+    @MainActor
+    private func toggleWithoutWaiting(
+        _ device: AnyDevice,
+        to state: DeviceState,
+        using server: HomeAssistantServer
+    ) async throws {
+        try await withCheckedThrowingContinuation {
+            (continuation: CheckedContinuation<Void, Error>) in
+            server.toggleDevice(device, state: state) { error in
+                if let error {
+                    continuation.resume(throwing: error)
+                } else {
+                    continuation.resume()
+                }
+            }
+        }
+    }
+}