souriscloud · Sep 23, 2026 · Sep 23, 2026 · Sep 23, 2026 · Sep 23, 2026 · Sep 23, 2026
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -13,13 +13,13 @@ concurrency:
 jobs:
   build-and-test:
     name: Build & Test
-    runs-on: macos-15
+    runs-on: macos-26
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v7
 
       - name: Select Xcode
-        run: sudo xcode-select -s /Applications/Xcode_16.2.app
+        run: sudo xcode-select -s /Applications/Xcode_26.6.app
 
       - name: Show versions
         run: |
@@ -43,18 +43,25 @@ jobs:
               -destination 'platform=macOS' \
               CODE_SIGNING_ALLOWED=NO
 
+  appcast:
+    name: Appcast
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v7
+
+      - name: Check appcast URLs point at their own release tags
+        run: python3 scripts/appcast-tool.py check appcast.xml "$GITHUB_REPOSITORY"
+
   lint:
     name: SwiftLint
-    runs-on: macos-15
-    # Non-blocking while the team tunes the ruleset on a previously-unlinted
-    # codebase. Flip to a required check (and add --strict) once it's green.
-    continue-on-error: true
+    runs-on: macos-26
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v7
 
       - name: Install SwiftLint
         run: brew install swiftlint
 
       - name: Run SwiftLint
-        run: swiftlint lint --reporter github-actions-logging
+        run: swiftlint lint --strict --reporter github-actions-logging
diff --git a/.swiftlint.yml b/.swiftlint.yml
@@ -2,7 +2,7 @@
 #
 # Intentionally conservative: this is the first lint pass over an existing
 # codebase, so the noisier opinionated rules are disabled and thresholds are
-# relaxed. Tighten over time, then make the CI lint job a required check.
+# relaxed. CI runs it with --strict, so any violation fails the build.
 
 included:
   - VirtualMirror

diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -7,6 +7,39 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- Errors now show in the receiver window, with a Retry button. This covers the AirPlay port already being in use (e.g. a second copy of VirtualMirror or another receiver), Local Network access being denied, and Bonjour advertising failing. Previously the window showed "waiting" forever while the iPhone failed to connect.
+- Audio recovers by itself when the Mac's output device changes (AirPods, monitor speakers, unplugging headphones). Previously it stayed silent until mirroring restarted.
+- 10 new tests covering the session lifecycle: ending, eviction and TEARDOWN handling, including an end-to-end test over a real listener. The suite now has 58 tests.
+- A CI check that every appcast download URL points at its own release, plus `scripts/appcast-tool.py` to fix and verify the appcast (`check --online` also requests every URL).
+
+### Changed
+
+- Updated Sparkle from 2.9.0 to 2.10.0. This includes upstream security fixes to the installer and to delta updates, and brings update windows to the front correctly in menu-bar apps.
+- The GetParameter volume query now reports the receiver's real volume, in AirPlay's dB scale, instead of a fixed value.
+- CI now runs on `macos-26` with Xcode 26.6.
+- The project now builds in **Swift 6 language mode**, so the compiler checks for data races at compile time. Types that do all their work on one serial queue are marked `@unchecked Sendable`, with a comment explaining why each is safe. The video decoder's error counter, which the decode callback updated with no lock, is now locked.
+- SwiftLint is clean and now a required CI check (`--strict`).
+- The in-app Help and the README now cover the error screen and Retry, Local Network access, a second device taking over a receiver, audio following output-device changes, and per-receiver ports. The README no longer says the pairing identity is stored in the Keychain, which stopped being true in 0.4.0.
+- The release script:
+  - uploads the delta updates alongside the DMG
+  - publishes the GitHub release before pushing the appcast, so an update is never advertised before its download exists
+  - runs Sparkle's tools from the same version that is linked into the app
+  - validates the DMG's notarization ticket
+  - checks every appcast URL after publishing
+
+### Fixed
+
+- The window no longer stays on "Mirroring" with a frozen last frame after the sender stops mirroring. This covers iOS 27, which ends a session with a TEARDOWN that doesn't name a stream.
+- When a second device (or any other TCP client) connected to a receiver, the first session was dropped without the UI noticing. The window could then sit on a frozen frame or on "Connecting" indefinitely.
+- The 30-second "Connecting" timeout now also closes the stuck connection, so the sender gives up cleanly.
+- Fixed potential crashes when closing or restarting a receiver, or when a sender reconnected while streaming. Video, audio and Bonjour resources were torn down on one thread while another was still using them.
+- Each iPhone lock/unlock no longer leaks timing-sync network connections.
+- Commands from the menu-bar Command Palette now act on the most recently focused receiver instead of the first one, when no receiver window is focused.
+- Delta updates now actually work: their files had never been uploaded, and the appcast pointed older versions' downloads at the wrong release.
+- A rejected pair-verify now stops processing any further requests already buffered on that connection.
+
 ## [0.4.0] - 2026-05-31
 
 ### Added

diff --git a/CLAUDE.md b/CLAUDE.md
@@ -13,7 +13,7 @@ xcodebuild build -project VirtualMirror.xcodeproj -scheme VirtualMirror -configu
 Open in Xcode: `open VirtualMirror.xcodeproj`
 
 - Deployment target: macOS 14.0
-- Swift version: 5.0
+- Swift version: 6.0 (Swift 6 language mode, complete concurrency checking)
 - Uses C bridging header for FairPlay code (`VirtualMirror/FairPlay/BridgingHeader.h`)
 
 ## Architecture

diff --git a/README.md b/README.md
@@ -12,12 +12,12 @@ AirPlay screen mirroring receiver for macOS. Mirror your iPhone or iPad screen t
 ## Features
 
 - **Screen Mirroring** — Receive AirPlay mirroring from any iPhone or iPad
-- **Audio** — Full audio passthrough with adjustable volume control
+- **Audio** — Full audio passthrough with adjustable volume control; follows you when you switch output devices
 - **Rotation** — Seamlessly handles device rotation and lock/unlock
 - **Low Latency** — Hardware-accelerated H.264 decoding via VideoToolbox
 - **Menu Bar** — Runs quietly in the menu bar with live connection status
 - **Auto-Update** — Built-in update checking via Sparkle
-- **Secure** — Cryptographic identity stored in macOS Keychain; full AirPlay pairing and FairPlay DRM support
+- **Private** — Fresh pairing identity per receiver, generated in memory and never persisted; full AirPlay pairing and FairPlay DRM support
 
 ## Download
 
@@ -68,16 +68,18 @@ If the macOS built-in **AirPlay Receiver** is enabled, your iPhone may connect t
 ### Connection drops or won't connect
 
 - Make sure your iPhone/iPad and Mac are on the **same Wi-Fi network**
-- Restart VirtualMirror from the menu bar (Quit, then relaunch)
-- Check that no firewall is blocking port **47000**
+- If the window shows an error (port already in use, no Local Network access), fix the cause it names and click **Retry**
+- Use **Restart This Receiver** from the Command Palette (⌘K), or quit from the menu bar and relaunch
+- Check that no firewall is blocking VirtualMirror — the first receiver listens on port **47000**, each additional one 1000 higher (48000, 49000, …)
+- A second device mirroring to the same receiver replaces the first; open another receiver (⌘N) to show both
 
 ### Local network permission
 
-The first time you run it, macOS may ask VirtualMirror for permission to find devices on your local network. Allow it — AirPlay discovery needs it. Each receiver generates a fresh pairing identity in memory; nothing is persisted.
+The first time you run it, macOS asks VirtualMirror for permission to find devices on your local network. Allow it — AirPlay discovery needs it. If you declined, enable it in **System Settings > Privacy & Security > Local Network**, then click **Retry** in the receiver window. Each receiver generates a fresh pairing identity in memory; nothing is persisted.
 
 ## Building from Source
 
-Requires macOS 14.0+ and Xcode 15+.
+Requires Xcode 26+ (Swift 6 language mode). The app runs on macOS 14.0+.
 
 ```bash
 git clone https://github.com/souriscloud/VirtualMirror.git

diff --git a/VirtualMirror.xcodeproj/project.pbxproj b/VirtualMirror.xcodeproj/project.pbxproj
@@ -50,6 +50,7 @@
 		T1000004 /* HTTPResponseTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = T2000004; };
 		T1000005 /* HTTPParserHardeningTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = T2000005; };
 		T1000006 /* PairVerifyHandlerTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = T2000006; };
+		T1000007 /* SessionLifecycleTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = T2000007; };
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
@@ -102,6 +103,7 @@
 		T2000004 /* HTTPResponseTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = HTTPResponseTests.swift; sourceTree = "<group>"; };
 		T2000005 /* HTTPParserHardeningTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = HTTPParserHardeningTests.swift; sourceTree = "<group>"; };
 		T2000006 /* PairVerifyHandlerTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PairVerifyHandlerTests.swift; sourceTree = "<group>"; };
+		T2000007 /* SessionLifecycleTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SessionLifecycleTests.swift; sourceTree = "<group>"; };
 		T3000001 /* VirtualMirrorTests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = VirtualMirrorTests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
 /* End PBXFileReference section */
 
@@ -149,6 +151,7 @@
 				T1000004 /* HTTPResponseTests.swift in Sources */,
 				T1000005 /* HTTPParserHardeningTests.swift in Sources */,
 				T1000006 /* PairVerifyHandlerTests.swift in Sources */,
+				T1000007 /* SessionLifecycleTests.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -287,6 +290,7 @@
 				T2000004 /* HTTPResponseTests.swift */,
 				T2000005 /* HTTPParserHardeningTests.swift */,
 				T2000006 /* PairVerifyHandlerTests.swift */,
+				T2000007 /* SessionLifecycleTests.swift */,
 			);
 			path = VirtualMirrorTests;
 			sourceTree = "<group>";
@@ -550,7 +554,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_EMIT_LOC_STRINGS = YES;
 				SWIFT_OBJC_BRIDGING_HEADER = "VirtualMirror/FairPlay/BridgingHeader.h";
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 6.0;
 			};
 			name = Debug;
 		};
@@ -579,7 +583,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_EMIT_LOC_STRINGS = YES;
 				SWIFT_OBJC_BRIDGING_HEADER = "VirtualMirror/FairPlay/BridgingHeader.h";
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 6.0;
 			};
 			name = Release;
 		};
@@ -595,7 +599,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = cloud.souris.virtualmirror.tests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_EMIT_LOC_STRINGS = NO;
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 6.0;
 				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/VirtualMirror.app/Contents/MacOS/VirtualMirror";
 			};
 			name = Debug;
@@ -612,7 +616,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = cloud.souris.virtualmirror.tests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_EMIT_LOC_STRINGS = NO;
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 6.0;
 				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/VirtualMirror.app/Contents/MacOS/VirtualMirror";
 			};
 			name = Release;
@@ -655,7 +659,7 @@
 			repositoryURL = "https://github.com/sparkle-project/Sparkle";
 			requirement = {
 				kind = upToNextMajorVersion;
-				minimumVersion = 2.6.0;
+				minimumVersion = 2.10.0;
 			};
 		};
 /* End XCRemoteSwiftPackageReference section */

diff --git a/VirtualMirror.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved b/VirtualMirror.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved
diff --git a/VirtualMirror/AboutView.swift b/VirtualMirror/AboutView.swift
@@ -138,7 +138,7 @@ private struct AckSection: View {
     let title: String
     let description: String
     let license: String
-    var url: String? = nil
+    var url: String?
 
     var body: some View {
         VStack(alignment: .leading, spacing: 4) {

diff --git a/VirtualMirror/AirPlay/AirPlayConfig.swift b/VirtualMirror/AirPlay/AirPlayConfig.swift
@@ -92,33 +92,33 @@ struct AirPlayConfig {
                     "overscanned": NSNumber(value: false),
                     "refreshRate": NSNumber(value: 1.0 / 60.0),
                     "maxFPS": NSNumber(value: 30 as UInt64),
-                ] as [String : Any]
+                ] as [String: Any]
             ],
             "audioFormats": [
                 [
                     "type": NSNumber(value: 100 as UInt64),
                     "audioInputFormats": NSNumber(value: 0x03FFFFFC as UInt64),
                     "audioOutputFormats": NSNumber(value: 0x03FFFFFC as UInt64),
-                ] as [String : Any],
+                ] as [String: Any],
                 [
                     "type": NSNumber(value: 101 as UInt64),
                     "audioInputFormats": NSNumber(value: 0x03FFFFFC as UInt64),
                     "audioOutputFormats": NSNumber(value: 0x03FFFFFC as UInt64),
-                ] as [String : Any],
+                ] as [String: Any],
             ],
             "audioLatencies": [
                 [
                     "type": NSNumber(value: 100 as UInt64),
                     "audioType": "default",
                     "inputLatencyMicros": NSNumber(value: 0 as UInt64),
                     "outputLatencyMicros": NSNumber(value: false),
-                ] as [String : Any],
+                ] as [String: Any],
                 [
                     "type": NSNumber(value: 101 as UInt64),
                     "audioType": "default",
                     "inputLatencyMicros": NSNumber(value: 0 as UInt64),
                     "outputLatencyMicros": NSNumber(value: false),
-                ] as [String : Any],
+                ] as [String: Any],
             ],
         ]
         do {