fix CI

inject controls in homepage

.gitea/workflows/build.yaml

@@ -15,44 +15,51 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: linux/amd64
+    container:
+      image: gitea.tourolle.paris/dtourolle/jellylms-builder:latest
 
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
+        with:
+          path: build-${{ github.run_id }}
 
-      - name: Verify .NET installation
+      - name: Cache NuGet packages
-        run: dotnet --version
+        uses: actions/cache@v3
+        with:
+          path: ~/.nuget/packages
+          key: nuget-${{ hashFiles('**/Jellyfin.Plugin.JellyLMS.csproj') }}
+          restore-keys: nuget-
 
       - name: Restore dependencies
+        working-directory: build-${{ github.run_id }}
         run: dotnet restore Jellyfin.Plugin.JellyLMS.sln
 
       - name: Build solution
-        run: dotnet build Jellyfin.Plugin.JellyLMS.sln --configuration Release --no-restore --no-self-contained
+        working-directory: build-${{ github.run_id }}
-
+        run: dotnet build Jellyfin.Plugin.JellyLMS.sln --configuration Release --no-restore --no-self-contained /m:1
-      - name: Install JPRM
-        run: |
-          python3 -m venv /tmp/jprm-venv
-          /tmp/jprm-venv/bin/pip install jprm
 
       - name: Build Jellyfin Plugin
         id: jprm
+        working-directory: build-${{ github.run_id }}
         run: |
-          # Create artifacts directory for JPRM output
           mkdir -p artifacts
-
+          jprm --verbosity=debug plugin build .
-          # Build plugin using JPRM
+          ARTIFACT=$(find . -name "*.zip" -type f -print -quit | sed 's|^\./||')
-          /tmp/jprm-venv/bin/jprm --verbosity=debug plugin build .
+          LATEST="artifacts/jellylms_latest.zip"
-
+          cp "${ARTIFACT}" "${LATEST}"
-          # Find the generated zip file
+          echo "artifact=${LATEST}" >> $GITHUB_OUTPUT
-          ARTIFACT=$(find . -name "*.zip" -type f -print -quit)
+          echo "Found artifact: ${ARTIFACT} -> ${LATEST}"
-          echo "artifact=${ARTIFACT}" >> $GITHUB_OUTPUT
-          echo "Found artifact: ${ARTIFACT}"
 
       - name: Upload build artifact
         uses: actions/upload-artifact@v3
         with:
           name: jellylms-plugin
-          path: ${{ steps.jprm.outputs.artifact }}
+          path: build-${{ github.run_id }}/${{ steps.jprm.outputs.artifact }}
           retention-days: 30
           if-no-files-found: error
+
+      - name: Cleanup
+        if: always()
+        run: rm -rf build-${{ github.run_id }}

.gitea/workflows/release.yaml

@@ -13,14 +13,15 @@ on:
 
 jobs:
   build-and-release:
-    runs-on: ubuntu-latest
+    runs-on: linux/amd64
+    container:
+      image: gitea.tourolle.paris/dtourolle/jellylms-builder:latest
 
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
-
+        with:
-      - name: Verify .NET installation
+          path: release-${{ github.run_id }}
-        run: dotnet --version
 
       - name: Get version
         id: get_version
@@ -35,39 +36,41 @@ jobs:
           echo "Building version: ${VERSION}"
 
       - name: Update build.yaml with version
+        working-directory: release-${{ github.run_id }}
         run: |
           VERSION="${{ steps.get_version.outputs.version_number }}"
           sed -i "s/^version:.*/version: \"${VERSION}\"/" build.yaml
           cat build.yaml
 
+      - name: Cache NuGet packages
+        uses: actions/cache@v3
+        with:
+          path: ~/.nuget/packages
+          key: nuget-${{ hashFiles('**/Jellyfin.Plugin.JellyLMS.csproj') }}
+          restore-keys: nuget-
+
       - name: Restore dependencies
+        working-directory: release-${{ github.run_id }}
         run: dotnet restore Jellyfin.Plugin.JellyLMS.sln
 
       - name: Build solution
-        run: dotnet build Jellyfin.Plugin.JellyLMS.sln --configuration Release --no-restore --no-self-contained
+        working-directory: release-${{ github.run_id }}
-
+        run: dotnet build Jellyfin.Plugin.JellyLMS.sln --configuration Release --no-restore --no-self-contained /m:1
-      - name: Install JPRM
-        run: |
-          python3 -m venv /tmp/jprm-venv
-          /tmp/jprm-venv/bin/pip install jprm
 
       - name: Build Jellyfin Plugin
         id: jprm
+        working-directory: release-${{ github.run_id }}
         run: |
-          # Create artifacts directory for JPRM output
           mkdir -p artifacts
-
+          jprm --verbosity=debug plugin build ./
-          # Build plugin using JPRM
+          ARTIFACT=$(find . -name "*.zip" -type f -print -quit | sed 's|^\./||')
-          /tmp/jprm-venv/bin/jprm --verbosity=debug plugin build ./
-
-          # Find the generated zip file
-          ARTIFACT=$(find . -name "*.zip" -type f -print -quit)
           ARTIFACT_NAME=$(basename "${ARTIFACT}")
           echo "artifact=${ARTIFACT}" >> $GITHUB_OUTPUT
           echo "artifact_name=${ARTIFACT_NAME}" >> $GITHUB_OUTPUT
           echo "Found artifact: ${ARTIFACT}"
 
       - name: Create Release
+        working-directory: release-${{ github.run_id }}
         env:
           GITEA_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
@@ -76,22 +79,13 @@ jobs:
           REPO_NAME="${{ github.event.repository.name }}"
           GITEA_URL="${{ github.server_url }}"
 
-          # Prepare release body
-          RELEASE_BODY="JellyLMS Jellyfin Plugin ${{ steps.get_version.outputs.version }}\n\nSee attached files for plugin installation."
-          RELEASE_BODY_JSON=$(echo -n "${RELEASE_BODY}" | jq -Rs .)
-
           # Create release using Gitea API
+          VERSION="${{ steps.get_version.outputs.version }}"
           RESPONSE=$(curl -s -w "\n%{http_code}" -X POST \
             -H "Authorization: token ${GITEA_TOKEN}" \
             -H "Content-Type: application/json" \
             "${GITEA_URL}/api/v1/repos/${REPO_OWNER}/${REPO_NAME}/releases" \
-            -d "{
+            -d "$(jq -n --arg tag "$VERSION" --arg name "Release $VERSION" --arg body "JellyLMS Jellyfin Plugin ${VERSION}. See attached files for plugin installation." '{tag_name: $tag, name: $name, body: $body, draft: false, prerelease: false}')")
-              \"tag_name\": \"${{ steps.get_version.outputs.version }}\",
-              \"name\": \"Release ${{ steps.get_version.outputs.version }}\",
-              \"body\": ${RELEASE_BODY_JSON},
-              \"draft\": false,
-              \"prerelease\": false
-            }")
 
           HTTP_CODE=$(echo "$RESPONSE" | tail -n1)
           BODY=$(echo "$RESPONSE" | sed '$d')
@@ -126,13 +120,20 @@ jobs:
 
       - name: Calculate checksum
         id: checksum
+        working-directory: release-${{ github.run_id }}
         run: |
           CHECKSUM=$(md5sum "${{ steps.jprm.outputs.artifact }}" | awk '{print $1}')
           echo "checksum=${CHECKSUM}" >> $GITHUB_OUTPUT
           echo "MD5 checksum: ${CHECKSUM}"
 
       - name: Update manifest.json
+        working-directory: release-${{ github.run_id }}
         run: |
+          git config user.name "Gitea Actions"
+          git config user.email "actions@gitea.tourolle.paris"
+          git fetch origin master
+          git checkout master
+
           VERSION="${{ steps.get_version.outputs.version_number }}"
           CHECKSUM="${{ steps.checksum.outputs.checksum }}"
           TIMESTAMP=$(date -u +"%Y-%m-%dT%H:%M:%SZ")
@@ -163,11 +164,14 @@ jobs:
           cat manifest.json
 
       - name: Commit and push manifest
+        working-directory: release-${{ github.run_id }}
         env:
           GITEA_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
-          git config user.name "Gitea Actions"
-          git config user.email "actions@gitea.tourolle.paris"
           git add manifest.json
           git commit -m "Update manifest.json for ${{ steps.get_version.outputs.version }}"
-          git push origin HEAD:master
+          git push origin master
+
+      - name: Cleanup
+        if: always()
+        run: rm -rf release-${{ github.run_id }}

Dockerfile.builder

@@ -0,0 +1,19 @@
+# JellyLMS Builder Image
+# Pre-built image with .NET SDK and JPRM for building Jellyfin plugins
+# Build: docker build -f Dockerfile.builder -t gitea.tourolle.paris/dtourolle/jellylms-builder:latest .
+# Push:  docker push gitea.tourolle.paris/dtourolle/jellylms-builder:latest
+
+FROM mcr.microsoft.com/dotnet/sdk:9.0
+
+RUN apt-get update && apt-get install -y \
+    python3 \
+    python3-pip \
+    git \
+    jq \
+    nodejs \
+    npm \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN pip install --break-system-packages jprm
+
+WORKDIR /src

Jellyfin.Plugin.JellyLMS/Api/JellyLmsController.cs

@@ -3,8 +3,10 @@ using System.Collections.Generic;
 using System.ComponentModel.DataAnnotations;
 using System.Linq;
 using System.Net.Mime;
+using System.Reflection;
 using System.Threading.Tasks;
 using Jellyfin.Data.Enums;
+using Jellyfin.Database.Implementations.Enums;
 using Jellyfin.Plugin.JellyLMS.Models;
 using Jellyfin.Plugin.JellyLMS.Services;
 using MediaBrowser.Controller.Entities;
@@ -28,26 +30,63 @@ public class JellyLmsController : ControllerBase
 {
     private readonly ILmsApiClient _lmsClient;
     private readonly LmsPlayerManager _playerManager;
-    private readonly LmsSessionManager _sessionManager;
     private readonly ILibraryManager _libraryManager;
+    private readonly IUserManager _userManager;
 
     /// <summary>
     /// Initializes a new instance of the <see cref="JellyLmsController"/> class.
     /// </summary>
     /// <param name="lmsClient">The LMS API client.</param>
     /// <param name="playerManager">The player manager.</param>
-    /// <param name="sessionManager">The session manager.</param>
     /// <param name="libraryManager">The library manager.</param>
+    /// <param name="userManager">The user manager.</param>
     public JellyLmsController(
         ILmsApiClient lmsClient,
         LmsPlayerManager playerManager,
-        LmsSessionManager sessionManager,
+        ILibraryManager libraryManager,
-        ILibraryManager libraryManager)
+        IUserManager userManager)
     {
         _lmsClient = lmsClient;
         _playerManager = playerManager;
-        _sessionManager = sessionManager;
         _libraryManager = libraryManager;
+        _userManager = userManager;
+    }
+
+    /// <summary>
+    /// Determines whether the current user is allowed to use the multi-room remote
+    /// control features (administrators, or users granted the
+    /// "Allow remote control of other users" permission).
+    /// </summary>
+    /// <returns><c>true</c> if the user may use remote control endpoints.</returns>
+    private bool HasRemoteControlAccess()
+    {
+        var username = User.Identity?.Name;
+        if (string.IsNullOrEmpty(username))
+        {
+            return false;
+        }
+
+        var user = _userManager.GetUserByName(username);
+        if (user is null)
+        {
+            return false;
+        }
+
+        return HasPermission(user, PermissionKind.IsAdministrator)
+            || HasPermission(user, PermissionKind.EnableRemoteControlOfOtherUsers);
+    }
+
+    private static bool HasPermission(Jellyfin.Database.Implementations.Entities.User user, PermissionKind kind)
+    {
+        foreach (var permission in user.Permissions)
+        {
+            if (permission.Kind == kind)
+            {
+                return permission.Value;
+            }
+        }
+
+        return false;
     }
 
     /// <summary>
@@ -69,8 +108,14 @@ public class JellyLmsController : ControllerBase
     /// <returns>List of players.</returns>
     [HttpGet("Players")]
     [ProducesResponseType(StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
     public async Task<ActionResult<List<LmsPlayer>>> GetPlayers([FromQuery] bool refresh = false)
     {
+        if (!HasRemoteControlAccess())
+        {
+            return Forbid();
+        }
+
         var players = await _playerManager.GetPlayersAsync(refresh).ConfigureAwait(false);
         return Ok(players);
     }
@@ -82,9 +127,15 @@ public class JellyLmsController : ControllerBase
     /// <returns>The player details.</returns>
     [HttpGet("Players/{mac}")]
     [ProducesResponseType(StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
     [ProducesResponseType(StatusCodes.Status404NotFound)]
     public async Task<ActionResult<LmsPlayer>> GetPlayer(string mac)
     {
+        if (!HasRemoteControlAccess())
+        {
+            return Forbid();
+        }
+
         var player = await _playerManager.GetPlayerAsync(mac).ConfigureAwait(false);
         if (player == null)
         {
@@ -102,8 +153,14 @@ public class JellyLmsController : ControllerBase
     [HttpPost("Players/{mac}/PowerOn")]
     [ProducesResponseType(StatusCodes.Status200OK)]
     [ProducesResponseType(StatusCodes.Status400BadRequest)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
     public async Task<ActionResult> PowerOn(string mac)
     {
+        if (!HasRemoteControlAccess())
+        {
+            return Forbid();
+        }
+
         var success = await _lmsClient.PowerOnAsync(mac).ConfigureAwait(false);
         return success ? Ok() : BadRequest("Failed to power on player");
     }
@@ -116,8 +173,14 @@ public class JellyLmsController : ControllerBase
     [HttpPost("Players/{mac}/PowerOff")]
     [ProducesResponseType(StatusCodes.Status200OK)]
     [ProducesResponseType(StatusCodes.Status400BadRequest)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
     public async Task<ActionResult> PowerOff(string mac)
     {
+        if (!HasRemoteControlAccess())
+        {
+            return Forbid();
+        }
+
         var success = await _lmsClient.PowerOffAsync(mac).ConfigureAwait(false);
         return success ? Ok() : BadRequest("Failed to power off player");
     }
@@ -131,8 +194,14 @@ public class JellyLmsController : ControllerBase
     [HttpPost("Players/{mac}/Volume")]
     [ProducesResponseType(StatusCodes.Status200OK)]
     [ProducesResponseType(StatusCodes.Status400BadRequest)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
     public async Task<ActionResult> SetVolume(string mac, [FromBody] VolumeRequest request)
     {
+        if (!HasRemoteControlAccess())
+        {
+            return Forbid();
+        }
+
         var success = await _lmsClient.SetVolumeAsync(mac, request.Volume).ConfigureAwait(false);
         return success ? Ok() : BadRequest("Failed to set volume");
     }
@@ -143,8 +212,14 @@ public class JellyLmsController : ControllerBase
     /// <returns>List of sync groups.</returns>
     [HttpGet("SyncGroups")]
     [ProducesResponseType(StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
     public async Task<ActionResult<List<SyncGroup>>> GetSyncGroups()
     {
+        if (!HasRemoteControlAccess())
+        {
+            return Forbid();
+        }
+
         var groups = await _playerManager.GetSyncGroupsAsync().ConfigureAwait(false);
         return Ok(groups);
     }
@@ -157,8 +232,14 @@ public class JellyLmsController : ControllerBase
     [HttpPost("SyncGroups")]
     [ProducesResponseType(StatusCodes.Status200OK)]
     [ProducesResponseType(StatusCodes.Status400BadRequest)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
     public async Task<ActionResult> CreateSyncGroup([FromBody] CreateSyncGroupRequest request)
     {
+        if (!HasRemoteControlAccess())
+        {
+            return Forbid();
+        }
+
         var success = await _playerManager.CreateSyncGroupAsync(request.MasterMac, request.SlaveMacs)
             .ConfigureAwait(false);
         return success ? Ok() : BadRequest("Failed to create sync group");
@@ -172,8 +253,14 @@ public class JellyLmsController : ControllerBase
     [HttpDelete("SyncGroups/Players/{mac}")]
     [ProducesResponseType(StatusCodes.Status200OK)]
     [ProducesResponseType(StatusCodes.Status400BadRequest)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
     public async Task<ActionResult> UnsyncPlayer(string mac)
     {
+        if (!HasRemoteControlAccess())
+        {
+            return Forbid();
+        }
+
         var success = await _playerManager.UnsyncPlayerAsync(mac).ConfigureAwait(false);
         return success ? Ok() : BadRequest("Failed to unsync player");
     }
@@ -186,114 +273,65 @@ public class JellyLmsController : ControllerBase
     [HttpDelete("SyncGroups/{masterMac}")]
     [ProducesResponseType(StatusCodes.Status200OK)]
     [ProducesResponseType(StatusCodes.Status400BadRequest)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
     public async Task<ActionResult> DissolveSyncGroup(string masterMac)
     {
+        if (!HasRemoteControlAccess())
+        {
+            return Forbid();
+        }
+
         var success = await _playerManager.DissolveSyncGroupAsync(masterMac).ConfigureAwait(false);
         return success ? Ok() : BadRequest("Failed to dissolve sync group");
     }
 
     /// <summary>
-    /// Gets all active playback sessions.
+    /// Checks whether the current user is allowed to use the multi-room remote control.
+    /// Used by the remote control page and the injected web client button to decide
+    /// whether to show themselves.
     /// </summary>
-    /// <returns>List of active sessions.</returns>
+    /// <returns>200 OK if allowed, otherwise 403 Forbidden.</returns>
-    [HttpGet("Sessions")]
+    [HttpGet("RemoteControl/Access")]
     [ProducesResponseType(StatusCodes.Status200OK)]
-    public ActionResult<List<LmsPlaybackSession>> GetSessions()
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
+    public ActionResult CheckRemoteControlAccess()
     {
-        return Ok(_sessionManager.GetActiveSessions());
+        return HasRemoteControlAccess() ? Ok() : Forbid();
     }
 
     /// <summary>
-    /// Starts playback of a Jellyfin item on LMS players.
+    /// Serves the standalone multi-room remote control page. The page itself contains
+    /// no sensitive data; it authenticates API calls using the Jellyfin access token
+    /// stored by the web client, so it is reachable without a prior Jellyfin auth header.
     /// </summary>
-    /// <param name="request">The playback request.</param>
+    /// <returns>The remote control HTML page.</returns>
-    /// <returns>The created session.</returns>
+    [HttpGet("RemoteControl")]
-    [HttpPost("Sessions/Play")]
+    [AllowAnonymous]
     [ProducesResponseType(StatusCodes.Status200OK)]
-    [ProducesResponseType(StatusCodes.Status400BadRequest)]
+    public ActionResult GetRemoteControlPage()
-    public async Task<ActionResult<LmsPlaybackSession>> StartPlayback([FromBody] StartPlaybackRequest request)
     {
-        var session = await _sessionManager.StartPlaybackAsync(request.ItemId, request.PlayerMacs, request.UserId)
+        return ServeEmbeddedResource("Jellyfin.Plugin.JellyLMS.Web.RemoteControl.html", "text/html");
-            .ConfigureAwait(false);
-
-        if (session == null)
-        {
-            return BadRequest("Failed to start playback");
-        }
-
-        return Ok(session);
     }
 
     /// <summary>
-    /// Pauses a playback session.
+    /// Serves the client script that is injected into the Jellyfin web client to add a
+    /// floating button linking to the remote control page.
     /// </summary>
-    /// <param name="sessionId">The session ID.</param>
+    /// <returns>The client script.</returns>
-    /// <returns>Success status.</returns>
+    [HttpGet("RemoteControl/ClientScript")]
-    [HttpPost("Sessions/{sessionId}/Pause")]
+    [AllowAnonymous]
     [ProducesResponseType(StatusCodes.Status200OK)]
-    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public ActionResult GetRemoteControlClientScript()
-    public async Task<ActionResult> PauseSession(string sessionId)
     {
-        var success = await _sessionManager.PauseSessionAsync(sessionId).ConfigureAwait(false);
+        return ServeEmbeddedResource("Jellyfin.Plugin.JellyLMS.Web.remote-button.js", "application/javascript");
-        return success ? Ok() : NotFound();
     }
 
-    /// <summary>
+    private FileStreamResult ServeEmbeddedResource(string resourceName, string contentType)
-    /// Resumes a paused playback session.
-    /// </summary>
-    /// <param name="sessionId">The session ID.</param>
-    /// <returns>Success status.</returns>
-    [HttpPost("Sessions/{sessionId}/Resume")]
-    [ProducesResponseType(StatusCodes.Status200OK)]
-    [ProducesResponseType(StatusCodes.Status404NotFound)]
-    public async Task<ActionResult> ResumeSession(string sessionId)
     {
-        var success = await _sessionManager.ResumeSessionAsync(sessionId).ConfigureAwait(false);
+        var stream = Assembly.GetExecutingAssembly().GetManifestResourceStream(resourceName)
-        return success ? Ok() : NotFound();
+            ?? throw new InvalidOperationException($"Embedded resource '{resourceName}' not found.");
-    }
 
-    /// <summary>
+        return File(stream, contentType);
-    /// Stops a playback session.
-    /// </summary>
-    /// <param name="sessionId">The session ID.</param>
-    /// <returns>Success status.</returns>
-    [HttpPost("Sessions/{sessionId}/Stop")]
-    [ProducesResponseType(StatusCodes.Status200OK)]
-    [ProducesResponseType(StatusCodes.Status404NotFound)]
-    public async Task<ActionResult> StopSession(string sessionId)
-    {
-        var success = await _sessionManager.StopSessionAsync(sessionId).ConfigureAwait(false);
-        return success ? Ok() : NotFound();
-    }
-
-    /// <summary>
-    /// Seeks to a position in the playback session.
-    /// </summary>
-    /// <param name="sessionId">The session ID.</param>
-    /// <param name="request">The seek request.</param>
-    /// <returns>Success status.</returns>
-    [HttpPost("Sessions/{sessionId}/Seek")]
-    [ProducesResponseType(StatusCodes.Status200OK)]
-    [ProducesResponseType(StatusCodes.Status404NotFound)]
-    public async Task<ActionResult> SeekSession(string sessionId, [FromBody] SeekRequest request)
-    {
-        var success = await _sessionManager.SeekAsync(sessionId, request.PositionTicks).ConfigureAwait(false);
-        return success ? Ok() : NotFound();
-    }
-
-    /// <summary>
-    /// Sets the volume for all players in a session.
-    /// </summary>
-    /// <param name="sessionId">The session ID.</param>
-    /// <param name="request">The volume request.</param>
-    /// <returns>Success status.</returns>
-    [HttpPost("Sessions/{sessionId}/Volume")]
-    [ProducesResponseType(StatusCodes.Status200OK)]
-    [ProducesResponseType(StatusCodes.Status404NotFound)]
-    public async Task<ActionResult> SetSessionVolume(string sessionId, [FromBody] VolumeRequest request)
-    {
-        var success = await _sessionManager.SetVolumeAsync(sessionId, request.Volume).ConfigureAwait(false);
-        return success ? Ok() : NotFound();
     }
 
     /// <summary>
@@ -407,37 +445,3 @@ public class CreateSyncGroupRequest
     [Required]
     public List<string> SlaveMacs { get; set; } = [];
 }
-
-/// <summary>
-/// Request to start playback.
-/// </summary>
-public class StartPlaybackRequest
-{
-    /// <summary>
-    /// Gets or sets the Jellyfin item ID.
-    /// </summary>
-    [Required]
-    public Guid ItemId { get; set; }
-
-    /// <summary>
-    /// Gets or sets the LMS player MAC addresses.
-    /// </summary>
-    [Required]
-    public List<string> PlayerMacs { get; set; } = [];
-
-    /// <summary>
-    /// Gets or sets the optional user ID.
-    /// </summary>
-    public Guid? UserId { get; set; }
-}
-
-/// <summary>
-/// Request to seek to a position.
-/// </summary>
-public class SeekRequest
-{
-    /// <summary>
-    /// Gets or sets the position in ticks.
-    /// </summary>
-    public long PositionTicks { get; set; }
-}

Jellyfin.Plugin.JellyLMS/Configuration/PluginConfiguration.cs

@@ -36,6 +36,7 @@ public class PluginConfiguration : BasePluginConfiguration
         ConnectionTimeoutSeconds = 10;
         EnableAutoSync = true;
         DefaultPlayerMac = string.Empty;
+        EnableHomeScreenButton = true;
     }
 
     /// <summary>
@@ -75,6 +76,12 @@ public class PluginConfiguration : BasePluginConfiguration
     /// </summary>
     public string DefaultPlayerMac { get; set; }
 
+    /// <summary>
+    /// Gets or sets a value indicating whether a floating "Remote" button linking to the
+    /// multi-room remote control page should be injected into the Jellyfin web client.
+    /// </summary>
+    public bool EnableHomeScreenButton { get; set; }
+
     /// <summary>
     /// Gets or sets the Jellyfin API key for authenticating stream requests from LMS.
     /// </summary>
@@ -106,6 +113,26 @@ public class PluginConfiguration : BasePluginConfiguration
     /// </summary>
     public List<PathMapping> PathMappings { get; set; } = new();
 
+    /// <summary>
+    /// Gets or sets the timeout in seconds when waiting for LMS to start playback.
+    /// </summary>
+    public int LoadingTimeoutSeconds { get; set; } = 5;
+
+    /// <summary>
+    /// Gets or sets the timeout in seconds when waiting for a seek operation to complete.
+    /// </summary>
+    public int SeekTimeoutSeconds { get; set; } = 3;
+
+    /// <summary>
+    /// Gets or sets the polling interval in milliseconds during state transitions.
+    /// </summary>
+    public int TransitionPollIntervalMs { get; set; } = 300;
+
+    /// <summary>
+    /// Gets or sets the number of automatic retries for transient failures.
+    /// </summary>
+    public int MaxAutoRetries { get; set; } = 2;
+
     /// <summary>
     /// Gets all effective path mappings, including legacy single mapping if configured.
     /// </summary>

Jellyfin.Plugin.JellyLMS/Configuration/configPage.html

@@ -182,6 +182,19 @@
                         </div>
                     </div>
 
+                    <div class="verticalSection">
+                        <h3>Multi-Room Remote</h3>
+                        <p class="fieldDescription">A standalone remote control page is available at <code>/JellyLms/RemoteControl</code> for any user granted the "Allow remote control of other users" permission (Dashboard &gt; Users).</p>
+
+                        <div class="checkboxContainer checkboxContainer-withDescription">
+                            <label class="emby-checkbox-label">
+                                <input id="EnableHomeScreenButton" name="EnableHomeScreenButton" type="checkbox" is="emby-checkbox" />
+                                <span>Show floating Remote button in web client</span>
+                            </label>
+                            <div class="fieldDescription checkboxFieldDescription">Adds a floating button to the Jellyfin web client that links to the remote control page (for authorized users only). Requires write access to the Jellyfin web root and a page reload to take effect.</div>
+                        </div>
+                    </div>
+
                     <div class="verticalSection">
                         <h3>Player Sync</h3>
                         <p class="fieldDescription">Select players to sync together for multi-room audio. Synced players play in perfect sync.</p>
@@ -567,6 +580,7 @@
                         document.querySelector('#EnableAutoSync').checked = config.EnableAutoSync !== false;
                         document.querySelector('#DefaultPlayerMac').value = config.DefaultPlayerMac || '';
                         document.querySelector('#UseDirectFilePath').checked = config.UseDirectFilePath || false;
+                        document.querySelector('#EnableHomeScreenButton').checked = config.EnableHomeScreenButton !== false;
 
                         // Load path mappings (new list format, with fallback to legacy single mapping)
                         JellyLmsConfig.pathMappings = config.PathMappings || [];
@@ -622,6 +636,7 @@
                         config.EnableAutoSync = document.querySelector('#EnableAutoSync').checked;
                         config.DefaultPlayerMac = document.querySelector('#DefaultPlayerMac').value;
                         config.UseDirectFilePath = document.querySelector('#UseDirectFilePath').checked;
+                        config.EnableHomeScreenButton = document.querySelector('#EnableHomeScreenButton').checked;
                         // Save path mappings (clear legacy single mapping when using list)
                         config.PathMappings = getPathMappingsFromUI();
                         config.JellyfinMediaPath = '';

Jellyfin.Plugin.JellyLMS/Jellyfin.Plugin.JellyLMS.csproj

@@ -28,6 +28,10 @@
   <ItemGroup>
     <None Remove="Configuration\configPage.html" />
     <EmbeddedResource Include="Configuration\configPage.html" />
+    <None Remove="Web\RemoteControl.html" />
+    <EmbeddedResource Include="Web\RemoteControl.html" />
+    <None Remove="Web\remote-button.js" />
+    <EmbeddedResource Include="Web\remote-button.js" />
   </ItemGroup>
 
 </Project>

Jellyfin.Plugin.JellyLMS/Models/LmsPlaybackSession.cs

@@ -9,9 +9,14 @@ namespace Jellyfin.Plugin.JellyLMS.Models;
 public enum PlaybackState
 {
     /// <summary>
-    /// Playback is stopped.
+    /// Device connected, no media loaded.
     /// </summary>
-    Stopped,
+    Idle,
+
+    /// <summary>
+    /// Play command sent, waiting for LMS to confirm playback started.
+    /// </summary>
+    Loading,
 
     /// <summary>
     /// Playback is active.
@@ -21,7 +26,84 @@ public enum PlaybackState
     /// <summary>
     /// Playback is paused.
     /// </summary>
-    Paused
+    Paused,
+
+    /// <summary>
+    /// Position change in progress.
+    /// </summary>
+    Seeking,
+
+    /// <summary>
+    /// Playback failed with an error.
+    /// </summary>
+    Error,
+
+    /// <summary>
+    /// Playback has ended.
+    /// </summary>
+    Stopped
+}
+
+/// <summary>
+/// Types of playback errors.
+/// </summary>
+public enum PlaybackErrorType
+{
+    /// <summary>
+    /// No error.
+    /// </summary>
+    None,
+
+    /// <summary>
+    /// Operation timed out waiting for LMS response.
+    /// </summary>
+    Timeout,
+
+    /// <summary>
+    /// Network error communicating with LMS.
+    /// </summary>
+    NetworkError,
+
+    /// <summary>
+    /// LMS returned an error.
+    /// </summary>
+    LmsError,
+
+    /// <summary>
+    /// Error with the audio stream from Jellyfin.
+    /// </summary>
+    StreamError,
+
+    /// <summary>
+    /// Unknown error.
+    /// </summary>
+    Unknown
+}
+
+/// <summary>
+/// Contains details about a playback error.
+/// </summary>
+public class PlaybackErrorInfo
+{
+    /// <summary>
+    /// Gets or sets the type of error.
+    /// </summary>
+    public PlaybackErrorType ErrorType { get; set; }
+
+    /// <summary>
+    /// Gets or sets the error message.
+    /// </summary>
+    public string Message { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Gets or sets when the error occurred.
+    /// </summary>
+    public DateTime OccurredAt { get; set; }
+
+    /// <summary>
+    /// Gets or sets the number of retry attempts made.
+    /// </summary>
+    public int RetryCount { get; set; }
 }
 
 /// <summary>
@@ -67,7 +149,12 @@ public class LmsPlaybackSession
     /// <summary>
     /// Gets or sets the current playback state.
     /// </summary>
-    public PlaybackState State { get; set; } = PlaybackState.Stopped;
+    public PlaybackState State { get; set; } = PlaybackState.Idle;
+
+    /// <summary>
+    /// Gets or sets the last error that occurred during playback.
+    /// </summary>
+    public PlaybackErrorInfo? LastError { get; set; }
 
     /// <summary>
     /// Gets or sets the current playback position in ticks.

Jellyfin.Plugin.JellyLMS/Plugin.cs

@@ -2,10 +2,12 @@ using System;
 using System.Collections.Generic;
 using System.Globalization;
 using Jellyfin.Plugin.JellyLMS.Configuration;
+using Jellyfin.Plugin.JellyLMS.Services;
 using MediaBrowser.Common.Configuration;
 using MediaBrowser.Common.Plugins;
 using MediaBrowser.Model.Plugins;
 using MediaBrowser.Model.Serialization;
+using Microsoft.Extensions.Logging;
 
 namespace Jellyfin.Plugin.JellyLMS;
 
@@ -15,15 +17,22 @@ namespace Jellyfin.Plugin.JellyLMS;
 /// </summary>
 public class Plugin : BasePlugin<PluginConfiguration>, IHasWebPages
 {
+    private readonly ILogger<Plugin> _logger;
+
     /// <summary>
     /// Initializes a new instance of the <see cref="Plugin"/> class.
     /// </summary>
     /// <param name="applicationPaths">Instance of the <see cref="IApplicationPaths"/> interface.</param>
     /// <param name="xmlSerializer">Instance of the <see cref="IXmlSerializer"/> interface.</param>
-    public Plugin(IApplicationPaths applicationPaths, IXmlSerializer xmlSerializer)
+    /// <param name="logger">The logger.</param>
+    public Plugin(IApplicationPaths applicationPaths, IXmlSerializer xmlSerializer, ILogger<Plugin> logger)
         : base(applicationPaths, xmlSerializer)
     {
         Instance = this;
+        _logger = logger;
+
+        WebClientPatchService.Apply(ApplicationPaths, Configuration.EnableHomeScreenButton, _logger);
+        ConfigurationChanged += (_, _) => WebClientPatchService.Apply(ApplicationPaths, Configuration.EnableHomeScreenButton, _logger);
     }
 
     /// <inheritdoc />

Jellyfin.Plugin.JellyLMS/PluginServiceRegistrator.cs

@@ -15,8 +15,6 @@ public class PluginServiceRegistrator : IPluginServiceRegistrator
     {
         serviceCollection.AddSingleton<ILmsApiClient, LmsApiClient>();
         serviceCollection.AddSingleton<LmsPlayerManager>();
-        serviceCollection.AddSingleton<LmsSessionManager>();
-        serviceCollection.AddHostedService(sp => sp.GetRequiredService<LmsSessionManager>());
 
         // Device discovery service - registers LMS players as Jellyfin sessions for casting
         // Use AddHostedService directly to let DI handle construction

Jellyfin.Plugin.JellyLMS/Services/LmsSessionController.cs

@@ -1,7 +1,7 @@
 using System;
-using System.Text.Json;
 using System.Threading;
 using System.Threading.Tasks;
+using Jellyfin.Plugin.JellyLMS.Configuration;
 using Jellyfin.Plugin.JellyLMS.Models;
 using MediaBrowser.Controller.Entities;
 using MediaBrowser.Controller.Library;
@@ -23,12 +23,16 @@ public class LmsSessionController : ISessionController, IDisposable
     private readonly SessionInfo _session;
     private readonly ISessionManager _sessionManager;
     private readonly ILibraryManager _libraryManager;
+    private readonly PlaybackStateMachine _stateMachine;
+    private readonly LmsStatusPoller _statusPoller;
+    private readonly CancellationTokenSource _cancellationTokenSource = new();
     private Timer? _progressTimer;
     private bool _disposed;
     private BaseItem? _currentItem;
     private Guid[] _playlist = [];
     private int _playlistIndex;
     private long _seekOffsetTicks; // Offset from transcoded stream start position
+    private PlaybackErrorInfo? _lastError;
 
     /// <summary>
     /// Initializes a new instance of the <see cref="LmsSessionController"/> class.
@@ -53,22 +57,41 @@ public class LmsSessionController : ISessionController, IDisposable
         _session = session;
         _sessionManager = sessionManager;
         _libraryManager = libraryManager;
+        _stateMachine = new PlaybackStateMachine(logger);
+        _statusPoller = new LmsStatusPoller(lmsClient, logger);
+
+        // Start status polling immediately to keep volume in sync
+        StartProgressTimer();
     }
 
+    private static PluginConfiguration Config => Plugin.Instance?.Configuration ?? new PluginConfiguration();
+
     /// <summary>
     /// Gets or sets the currently playing item ID.
     /// </summary>
     public Guid? CurrentItemId { get; set; }
 
     /// <summary>
-    /// Gets or sets a value indicating whether playback is currently active.
+    /// Gets a value indicating whether playback is currently active.
     /// </summary>
-    public bool IsPlaying { get; set; }
+    public bool IsPlaying => _stateMachine.CurrentState == PlaybackState.Playing
+        || _stateMachine.CurrentState == PlaybackState.Loading
+        || _stateMachine.CurrentState == PlaybackState.Seeking;
 
     /// <summary>
-    /// Gets or sets a value indicating whether playback is paused.
+    /// Gets a value indicating whether playback is paused.
     /// </summary>
-    public bool IsPaused { get; set; }
+    public bool IsPaused => _stateMachine.CurrentState == PlaybackState.Paused;
+
+    /// <summary>
+    /// Gets the current playback state.
+    /// </summary>
+    public PlaybackState State => _stateMachine.CurrentState;
+
+    /// <summary>
+    /// Gets the last error that occurred during playback.
+    /// </summary>
+    public PlaybackErrorInfo? LastError => _lastError;
 
     /// <inheritdoc />
     public bool IsSessionActive => _player.IsConnected;
@@ -185,12 +208,51 @@ public class LmsSessionController : ISessionController, IDisposable
             useDirectPath,
             streamUrl);
 
-        await _lmsClient.PlayUrlAsync(_player.MacAddress, streamUrl).ConfigureAwait(false);
+        // Transition to Loading state before sending command
+        _stateMachine.TryTransition(PlaybackState.Loading, "Starting playback");
+
+        // Send play command with retry logic
+        var playSuccess = await _statusPoller.ExecuteWithRetryAsync(
+            async () => await _lmsClient.PlayUrlAsync(_player.MacAddress, streamUrl).ConfigureAwait(false),
+            Config.MaxAutoRetries,
+            retry => _logger.LogInformation("Retrying play command (attempt {Retry})", retry),
+            _cancellationTokenSource.Token).ConfigureAwait(false);
+
+        if (!playSuccess)
+        {
+            _lastError = new PlaybackErrorInfo
+            {
+                ErrorType = PlaybackErrorType.LmsError,
+                Message = "Failed to send play command to LMS after retries",
+                OccurredAt = DateTime.UtcNow,
+                RetryCount = Config.MaxAutoRetries
+            };
+            _stateMachine.TryTransition(PlaybackState.Error, "Play command failed");
+            return;
+        }
+
+        // Wait for LMS to confirm playback started
+        var loadingTimeout = TimeSpan.FromSeconds(Config.LoadingTimeoutSeconds);
+        var started = await _statusPoller.WaitForPlaybackStartAsync(
+            _player.MacAddress,
+            loadingTimeout,
+            _cancellationTokenSource.Token).ConfigureAwait(false);
+
+        if (!started)
+        {
+            _lastError = new PlaybackErrorInfo
+            {
+                ErrorType = PlaybackErrorType.Timeout,
+                Message = $"LMS did not start playing within {loadingTimeout.TotalSeconds}s",
+                OccurredAt = DateTime.UtcNow
+            };
+            _stateMachine.TryTransition(PlaybackState.Error, "Loading timeout");
+            return;
+        }
 
         // Track current playback state
         CurrentItemId = itemId;
-        IsPlaying = true;
+        _stateMachine.TryTransition(PlaybackState.Playing, "LMS confirmed playback");
-        IsPaused = false;
 
         // Track the seek offset so we report the correct position
         // When using direct file paths, LMS handles seeking natively so no offset needed
@@ -236,7 +298,7 @@ public class LmsSessionController : ISessionController, IDisposable
         // Stop any existing timer
         _progressTimer?.Dispose();
 
-        // Report progress every 2 seconds
+        // Poll status every 2 seconds (for progress reporting when playing and volume sync always)
         _progressTimer = new Timer(
             async _ => await ReportPlaybackProgressAsync().ConfigureAwait(false),
             null,
@@ -246,21 +308,33 @@ public class LmsSessionController : ISessionController, IDisposable
 
     private void StopProgressTimer()
     {
-        _progressTimer?.Dispose();
+        // Don't actually stop the timer - keep polling for volume updates
-        _progressTimer = null;
+        // This ensures Jellyfin stays in sync with the device volume
+        // even when not playing media
     }
 
     private async Task ReportPlaybackProgressAsync()
     {
-        if (!IsPlaying || !CurrentItemId.HasValue)
+        try
+        {
+            // Always poll status to keep volume in sync, even when not playing
+            var status = await _lmsClient.GetPlayerStatusAsync(_player.MacAddress).ConfigureAwait(false);
+            if (status == null)
             {
                 return;
             }
 
-        try
+            // Update cached volume so Jellyfin stays in sync with device
-        {
+            _player.Volume = status.Volume;
-            var status = await _lmsClient.GetPlayerStatusAsync(_player.MacAddress).ConfigureAwait(false);
+
-            if (status == null)
+            // Don't report playback progress during Loading, Seeking, Error, Stopped, or Idle states
+            var currentState = _stateMachine.CurrentState;
+            if (currentState == PlaybackState.Loading
+                || currentState == PlaybackState.Seeking
+                || currentState == PlaybackState.Error
+                || currentState == PlaybackState.Stopped
+                || currentState == PlaybackState.Idle
+                || !CurrentItemId.HasValue)
             {
                 return;
             }
@@ -269,19 +343,29 @@ public class LmsSessionController : ISessionController, IDisposable
             // we're playing a transcoded stream that starts at the seek position.
             // Add the seek offset to get the actual track position.
             var positionTicks = (long)(status.Time * TimeSpan.TicksPerSecond) + _seekOffsetTicks;
-            var isPaused = status.Mode == "pause";
+            var lmsIsPaused = status.Mode == "pause";
 
-            // Update our local state from LMS
+            // Sync state machine with LMS state (handles external pause/play)
-            IsPaused = isPaused;
+            if (lmsIsPaused && currentState == PlaybackState.Playing)
+            {
+                _stateMachine.TryTransition(PlaybackState.Paused, "LMS reported pause");
+            }
+            else if (!lmsIsPaused && status.Mode == "play" && currentState == PlaybackState.Paused)
+            {
+                _stateMachine.TryTransition(PlaybackState.Playing, "LMS reported play");
+            }
 
             // Check if playback has stopped on LMS side (track ended)
-            // Only advance if we're not paused - LMS can briefly report "stop" during transitions
+            if (status.Mode == "stop" && currentState == PlaybackState.Playing)
-            if (status.Mode == "stop" && !IsPaused)
             {
-                // Double-check by getting status again after a brief delay to avoid false positives
+                // Confirm stop with a quick poll instead of fixed delay
-                await Task.Delay(500).ConfigureAwait(false);
+                var stillStopped = await _statusPoller.WaitForModeAsync(
-                var confirmStatus = await _lmsClient.GetPlayerStatusAsync(_player.MacAddress).ConfigureAwait(false);
+                    _player.MacAddress,
-                if (confirmStatus?.Mode != "stop")
+                    "stop",
+                    TimeSpan.FromMilliseconds(500),
+                    _cancellationTokenSource.Token).ConfigureAwait(false);
+
+                if (!stillStopped)
                 {
                     _logger.LogDebug("LMS mode changed from stop, ignoring");
                     return;
@@ -311,7 +395,7 @@ public class LmsSessionController : ISessionController, IDisposable
             {
                 ItemId = CurrentItemId.Value,
                 SessionId = _session.Id,
-                IsPaused = isPaused,
+                IsPaused = _stateMachine.CurrentState == PlaybackState.Paused,
                 PositionTicks = positionTicks,
                 PlayMethod = PlayMethod.DirectStream,
                 CanSeek = true,
@@ -347,8 +431,7 @@ public class LmsSessionController : ISessionController, IDisposable
             _logger.LogInformation("Reporting playback stopped for item {ItemId}", CurrentItemId.Value);
             await _sessionManager.OnPlaybackStopped(stopInfo).ConfigureAwait(false);
 
-            IsPlaying = false;
+            _stateMachine.TryTransition(PlaybackState.Stopped, "Playback stopped");
-            IsPaused = false;
             CurrentItemId = null;
         }
         catch (Exception ex)
@@ -382,29 +465,28 @@ public class LmsSessionController : ISessionController, IDisposable
             case PlaystateCommand.Pause:
                 var pauseResult = await _lmsClient.PauseAsync(_player.MacAddress).ConfigureAwait(false);
                 _logger.LogInformation("Pause command result: {Result}", pauseResult);
-                IsPaused = true;
+                _stateMachine.TryTransition(PlaybackState.Paused, "Pause command");
                 break;
 
             case PlaystateCommand.Unpause:
                 var playResult = await _lmsClient.PlayAsync(_player.MacAddress).ConfigureAwait(false);
                 _logger.LogInformation("Unpause/Play command result: {Result}", playResult);
-                IsPaused = false;
+                _stateMachine.TryTransition(PlaybackState.Playing, "Unpause command");
                 break;
 
             case PlaystateCommand.PlayPause:
-                // Toggle play/pause - check current state first
+                // Toggle play/pause based on current state
-                var currentState = await _lmsClient.GetPlayerStatusAsync(_player.MacAddress).ConfigureAwait(false);
+                if (_stateMachine.CurrentState == PlaybackState.Playing)
-                if (currentState?.Mode == "play")
                 {
                     var togglePauseResult = await _lmsClient.PauseAsync(_player.MacAddress).ConfigureAwait(false);
                     _logger.LogInformation("PlayPause toggle (pause) result: {Result}", togglePauseResult);
-                    IsPaused = true;
+                    _stateMachine.TryTransition(PlaybackState.Paused, "PlayPause toggle to pause");
                 }
                 else
                 {
                     var togglePlayResult = await _lmsClient.PlayAsync(_player.MacAddress).ConfigureAwait(false);
                     _logger.LogInformation("PlayPause toggle (play) result: {Result}", togglePlayResult);
-                    IsPaused = false;
+                    _stateMachine.TryTransition(PlaybackState.Playing, "PlayPause toggle to play");
                 }
 
                 break;
@@ -419,7 +501,10 @@ public class LmsSessionController : ISessionController, IDisposable
                 if (playstateRequest.SeekPositionTicks.HasValue && CurrentItemId.HasValue)
                 {
                     var positionTicks = playstateRequest.SeekPositionTicks.Value;
-                    var positionSeconds = positionTicks / TimeSpan.TicksPerSecond;
+                    var positionSeconds = (double)(positionTicks / TimeSpan.TicksPerSecond);
+
+                    // Transition to Seeking state (state machine remembers previous state)
+                    _stateMachine.TryTransition(PlaybackState.Seeking, "Seek command");
 
                     // Check if we're using direct file path mode - if so, LMS can seek natively
                     if (CanSeekNatively())
@@ -427,13 +512,37 @@ public class LmsSessionController : ISessionController, IDisposable
                         // Use native LMS seeking - much smoother!
                         _logger.LogInformation("Seeking natively to {Seconds}s using LMS time command", positionSeconds);
                         await _lmsClient.SeekAsync(_player.MacAddress, positionSeconds).ConfigureAwait(false);
+
+                        // Wait for seek to complete
+                        var seekTimeout = TimeSpan.FromSeconds(Config.SeekTimeoutSeconds);
+                        var seekComplete = await _statusPoller.WaitForSeekCompleteAsync(
+                            _player.MacAddress,
+                            positionSeconds,
+                            toleranceSeconds: 2.0,
+                            seekTimeout,
+                            _cancellationTokenSource.Token).ConfigureAwait(false);
+
                         // No seek offset needed - LMS handles position tracking natively
                         _seekOffsetTicks = 0;
+
+                        // Restore previous state
+                        var previousState = _stateMachine.StateBeforeSeek;
+                        if (seekComplete)
+                        {
+                            _stateMachine.TryTransition(previousState, "Seek completed");
+                        }
+                        else
+                        {
+                            _logger.LogWarning("Seek may not have completed within timeout, restoring state anyway");
+                            _stateMachine.TryTransition(previousState, "Seek timeout - restoring state");
+                        }
                     }
                     else
                     {
                         // For HTTP streams, LMS can't seek directly - we need to restart with startTimeTicks
-                        // Build a new URL with the seek position and restart playback
+                        // This is essentially a new playback, so transition to Loading
+                        _stateMachine.TryTransition(PlaybackState.Loading, "HTTP stream seek - restarting");
+
                         var streamUrl = BuildStreamUrlWithPosition(CurrentItemId.Value, positionTicks);
                         _logger.LogInformation(
                             "Seeking by restarting stream at position {Seconds}s: {Url}",
@@ -442,9 +551,30 @@ public class LmsSessionController : ISessionController, IDisposable
 
                         await _lmsClient.PlayUrlAsync(_player.MacAddress, streamUrl).ConfigureAwait(false);
 
+                        // Wait for playback to start
+                        var loadingTimeout = TimeSpan.FromSeconds(Config.LoadingTimeoutSeconds);
+                        var started = await _statusPoller.WaitForPlaybackStartAsync(
+                            _player.MacAddress,
+                            loadingTimeout,
+                            _cancellationTokenSource.Token).ConfigureAwait(false);
+
                         // Track the seek offset so we report the correct position
-                        // The transcoded stream starts at 0, but we need to report the actual track position
                         _seekOffsetTicks = positionTicks;
+
+                        if (started)
+                        {
+                            _stateMachine.TryTransition(PlaybackState.Playing, "HTTP stream seek completed");
+                        }
+                        else
+                        {
+                            _lastError = new PlaybackErrorInfo
+                            {
+                                ErrorType = PlaybackErrorType.Timeout,
+                                Message = "Stream restart after seek failed to start",
+                                OccurredAt = DateTime.UtcNow
+                            };
+                            _stateMachine.TryTransition(PlaybackState.Error, "HTTP stream seek failed");
+                        }
                     }
 
                     _logger.LogInformation("Seek offset is now {Ticks} ticks ({Seconds}s)", _seekOffsetTicks, _seekOffsetTicks / TimeSpan.TicksPerSecond);
@@ -686,7 +816,16 @@ public class LmsSessionController : ISessionController, IDisposable
 
         if (disposing)
         {
-            StopProgressTimer();
+            // Cancel any pending operations
+            _cancellationTokenSource.Cancel();
+            _cancellationTokenSource.Dispose();
+
+            // Actually stop the timer when disposing
+            _progressTimer?.Dispose();
+            _progressTimer = null;
+
+            // Reset state machine
+            _stateMachine.Reset();
         }
 
         _disposed = true;

Jellyfin.Plugin.JellyLMS/Services/LmsSessionManager.cs

@@ -1,313 +0,0 @@
-using System;
-using System.Collections.Concurrent;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading;
-using System.Threading.Tasks;
-using Jellyfin.Plugin.JellyLMS.Configuration;
-using Jellyfin.Plugin.JellyLMS.Models;
-using MediaBrowser.Controller.Library;
-using Microsoft.Extensions.Hosting;
-using Microsoft.Extensions.Logging;
-
-namespace Jellyfin.Plugin.JellyLMS.Services;
-
-/// <summary>
-/// Manages active playback sessions between Jellyfin and LMS.
-/// </summary>
-public class LmsSessionManager : IHostedService
-{
-    private readonly ILogger<LmsSessionManager> _logger;
-    private readonly ILmsApiClient _lmsClient;
-    private readonly LmsPlayerManager _playerManager;
-    private readonly ILibraryManager _libraryManager;
-    private readonly ConcurrentDictionary<string, LmsPlaybackSession> _sessions = new();
-
-    /// <summary>
-    /// Initializes a new instance of the <see cref="LmsSessionManager"/> class.
-    /// </summary>
-    /// <param name="logger">The logger instance.</param>
-    /// <param name="lmsClient">The LMS API client.</param>
-    /// <param name="playerManager">The player manager.</param>
-    /// <param name="libraryManager">The Jellyfin library manager.</param>
-    public LmsSessionManager(
-        ILogger<LmsSessionManager> logger,
-        ILmsApiClient lmsClient,
-        LmsPlayerManager playerManager,
-        ILibraryManager libraryManager)
-    {
-        _logger = logger;
-        _lmsClient = lmsClient;
-        _playerManager = playerManager;
-        _libraryManager = libraryManager;
-    }
-
-    private PluginConfiguration Config => Plugin.Instance?.Configuration ?? new PluginConfiguration();
-
-    /// <summary>
-    /// Gets all active sessions.
-    /// </summary>
-    /// <returns>List of active sessions.</returns>
-    public List<LmsPlaybackSession> GetActiveSessions()
-    {
-        return _sessions.Values.Where(s => s.State != PlaybackState.Stopped).ToList();
-    }
-
-    /// <summary>
-    /// Gets a session by ID.
-    /// </summary>
-    /// <param name="sessionId">The session ID.</param>
-    /// <returns>The session, or null if not found.</returns>
-    public LmsPlaybackSession? GetSession(string sessionId)
-    {
-        return _sessions.GetValueOrDefault(sessionId);
-    }
-
-    /// <summary>
-    /// Starts playback of a Jellyfin item on LMS players.
-    /// </summary>
-    /// <param name="itemId">The Jellyfin item ID.</param>
-    /// <param name="playerMacs">The LMS player MAC addresses.</param>
-    /// <param name="userId">Optional user ID.</param>
-    /// <returns>The created session.</returns>
-    public async Task<LmsPlaybackSession?> StartPlaybackAsync(
-        Guid itemId,
-        IEnumerable<string> playerMacs,
-        Guid? userId = null)
-    {
-        var macList = playerMacs.ToList();
-        if (macList.Count == 0)
-        {
-            _logger.LogWarning("No players specified for playback");
-            return null;
-        }
-
-        var item = _libraryManager.GetItemById(itemId);
-        if (item == null)
-        {
-            _logger.LogWarning("Item {ItemId} not found", itemId);
-            return null;
-        }
-
-        // Build the audio stream URL
-        var streamUrl = BuildStreamUrl(itemId);
-
-        var session = new LmsPlaybackSession
-        {
-            ItemId = itemId,
-            ItemName = item.Name,
-            PlayerMacs = macList,
-            State = PlaybackState.Playing,
-            StreamUrl = streamUrl,
-            UserId = userId,
-            RuntimeTicks = item.RunTimeTicks ?? 0
-        };
-
-        // If multiple players, sync them first
-        if (macList.Count > 1)
-        {
-            var masterMac = macList[0];
-            var slaveMacs = macList.Skip(1);
-            await _playerManager.CreateSyncGroupAsync(masterMac, slaveMacs).ConfigureAwait(false);
-        }
-
-        // Start playback on the first player (others will sync)
-        var targetMac = macList[0];
-        var success = await _lmsClient.PlayUrlAsync(targetMac, streamUrl, item.Name).ConfigureAwait(false);
-
-        if (!success)
-        {
-            _logger.LogError("Failed to start playback on player {Mac}", targetMac);
-            return null;
-        }
-
-        _sessions[session.SessionId] = session;
-        _logger.LogInformation(
-            "Started playback session {SessionId} for {Item} on {Count} players",
-            session.SessionId,
-            item.Name,
-            macList.Count);
-
-        return session;
-    }
-
-    /// <summary>
-    /// Pauses a playback session.
-    /// </summary>
-    /// <param name="sessionId">The session ID.</param>
-    /// <returns>True if successful.</returns>
-    public async Task<bool> PauseSessionAsync(string sessionId)
-    {
-        if (!_sessions.TryGetValue(sessionId, out var session))
-        {
-            return false;
-        }
-
-        // Pause the master player (synced players will follow)
-        var success = await _lmsClient.PauseAsync(session.PlayerMacs[0]).ConfigureAwait(false);
-
-        if (success)
-        {
-            session.State = PlaybackState.Paused;
-        }
-
-        return success;
-    }
-
-    /// <summary>
-    /// Resumes a paused playback session.
-    /// </summary>
-    /// <param name="sessionId">The session ID.</param>
-    /// <returns>True if successful.</returns>
-    public async Task<bool> ResumeSessionAsync(string sessionId)
-    {
-        if (!_sessions.TryGetValue(sessionId, out var session))
-        {
-            return false;
-        }
-
-        var success = await _lmsClient.PlayAsync(session.PlayerMacs[0]).ConfigureAwait(false);
-
-        if (success)
-        {
-            session.State = PlaybackState.Playing;
-        }
-
-        return success;
-    }
-
-    /// <summary>
-    /// Stops a playback session.
-    /// </summary>
-    /// <param name="sessionId">The session ID.</param>
-    /// <returns>True if successful.</returns>
-    public async Task<bool> StopSessionAsync(string sessionId)
-    {
-        if (!_sessions.TryGetValue(sessionId, out var session))
-        {
-            return false;
-        }
-
-        var success = await _lmsClient.StopAsync(session.PlayerMacs[0]).ConfigureAwait(false);
-
-        if (success)
-        {
-            session.State = PlaybackState.Stopped;
-
-            // Unsync players if there were multiple
-            if (session.PlayerMacs.Count > 1)
-            {
-                await _playerManager.DissolveSyncGroupAsync(session.PlayerMacs[0]).ConfigureAwait(false);
-            }
-        }
-
-        // Remove the session
-        _sessions.TryRemove(sessionId, out _);
-
-        return success;
-    }
-
-    /// <summary>
-    /// Seeks to a position in the playback session.
-    /// </summary>
-    /// <param name="sessionId">The session ID.</param>
-    /// <param name="positionTicks">The position in ticks.</param>
-    /// <returns>True if successful.</returns>
-    public async Task<bool> SeekAsync(string sessionId, long positionTicks)
-    {
-        if (!_sessions.TryGetValue(sessionId, out var session))
-        {
-            return false;
-        }
-
-        var positionSeconds = positionTicks / TimeSpan.TicksPerSecond;
-        var success = await _lmsClient.SeekAsync(session.PlayerMacs[0], positionSeconds).ConfigureAwait(false);
-
-        if (success)
-        {
-            session.PositionTicks = positionTicks;
-        }
-
-        return success;
-    }
-
-    /// <summary>
-    /// Sets the volume for all players in a session.
-    /// </summary>
-    /// <param name="sessionId">The session ID.</param>
-    /// <param name="volume">The volume level (0-100).</param>
-    /// <returns>True if successful.</returns>
-    public async Task<bool> SetVolumeAsync(string sessionId, int volume)
-    {
-        if (!_sessions.TryGetValue(sessionId, out var session))
-        {
-            return false;
-        }
-
-        var success = true;
-        foreach (var mac in session.PlayerMacs)
-        {
-            if (!await _lmsClient.SetVolumeAsync(mac, volume).ConfigureAwait(false))
-            {
-                success = false;
-            }
-        }
-
-        return success;
-    }
-
-    /// <summary>
-    /// Updates the session state from LMS.
-    /// </summary>
-    /// <param name="sessionId">The session ID.</param>
-    /// <returns>A task representing the operation.</returns>
-    public async Task RefreshSessionStateAsync(string sessionId)
-    {
-        if (!_sessions.TryGetValue(sessionId, out var session))
-        {
-            return;
-        }
-
-        var status = await _lmsClient.GetPlayerStatusAsync(session.PlayerMacs[0]).ConfigureAwait(false);
-        if (status == null)
-        {
-            return;
-        }
-
-        session.PositionTicks = (long)(status.Time * TimeSpan.TicksPerSecond);
-        session.State = status.Mode switch
-        {
-            "play" => PlaybackState.Playing,
-            "pause" => PlaybackState.Paused,
-            _ => PlaybackState.Stopped
-        };
-    }
-
-    private string BuildStreamUrl(Guid itemId)
-    {
-        var baseUrl = Config.JellyfinServerUrl.TrimEnd('/');
-        // Direct stream URL - LMS will pull audio from Jellyfin
-        return $"{baseUrl}/Audio/{itemId}/stream.mp3";
-    }
-
-    /// <inheritdoc />
-    public Task StartAsync(CancellationToken cancellationToken)
-    {
-        _logger.LogInformation("LMS Session Manager started");
-        return Task.CompletedTask;
-    }
-
-    /// <inheritdoc />
-    public Task StopAsync(CancellationToken cancellationToken)
-    {
-        _logger.LogInformation("LMS Session Manager stopping");
-
-        // Stop all active sessions
-        foreach (var sessionId in _sessions.Keys.ToList())
-        {
-            _ = StopSessionAsync(sessionId);
-        }
-
-        return Task.CompletedTask;
-    }
-}

Jellyfin.Plugin.JellyLMS/Services/LmsStatusPoller.cs

@@ -0,0 +1,228 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using Jellyfin.Plugin.JellyLMS.Configuration;
+using Microsoft.Extensions.Logging;
+
+namespace Jellyfin.Plugin.JellyLMS.Services;
+
+/// <summary>
+/// Polls LMS player status to confirm state transitions.
+/// </summary>
+public class LmsStatusPoller
+{
+    private readonly ILmsApiClient _lmsClient;
+    private readonly ILogger _logger;
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="LmsStatusPoller"/> class.
+    /// </summary>
+    /// <param name="lmsClient">The LMS API client.</param>
+    /// <param name="logger">The logger instance.</param>
+    public LmsStatusPoller(ILmsApiClient lmsClient, ILogger logger)
+    {
+        _lmsClient = lmsClient;
+        _logger = logger;
+    }
+
+    private static PluginConfiguration Config => Plugin.Instance?.Configuration ?? new PluginConfiguration();
+
+    /// <summary>
+    /// Waits for LMS to report that playback has started (mode="play").
+    /// </summary>
+    /// <param name="playerMac">The player's MAC address.</param>
+    /// <param name="timeout">Maximum time to wait.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>True if playback started within the timeout.</returns>
+    public async Task<bool> WaitForPlaybackStartAsync(
+        string playerMac,
+        TimeSpan timeout,
+        CancellationToken cancellationToken = default)
+    {
+        return await WaitForModeAsync(playerMac, "play", timeout, cancellationToken).ConfigureAwait(false);
+    }
+
+    /// <summary>
+    /// Waits for LMS to report a specific playback mode.
+    /// </summary>
+    /// <param name="playerMac">The player's MAC address.</param>
+    /// <param name="expectedMode">The expected mode ("play", "pause", "stop").</param>
+    /// <param name="timeout">Maximum time to wait.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>True if the expected mode was detected within the timeout.</returns>
+    public async Task<bool> WaitForModeAsync(
+        string playerMac,
+        string expectedMode,
+        TimeSpan timeout,
+        CancellationToken cancellationToken = default)
+    {
+        var pollInterval = TimeSpan.FromMilliseconds(Config.TransitionPollIntervalMs);
+        var startTime = DateTime.UtcNow;
+
+        _logger.LogDebug(
+            "Waiting for player {Mac} to reach mode '{Mode}' (timeout: {Timeout}s)",
+            playerMac,
+            expectedMode,
+            timeout.TotalSeconds);
+
+        while (DateTime.UtcNow - startTime < timeout)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+
+            try
+            {
+                var status = await _lmsClient.GetPlayerStatusAsync(playerMac).ConfigureAwait(false);
+                if (status?.Mode == expectedMode)
+                {
+                    _logger.LogDebug(
+                        "Player {Mac} reached mode '{Mode}' after {Elapsed}ms",
+                        playerMac,
+                        expectedMode,
+                        (DateTime.UtcNow - startTime).TotalMilliseconds);
+                    return true;
+                }
+
+                _logger.LogDebug(
+                    "Player {Mac} current mode: '{CurrentMode}', waiting for '{ExpectedMode}'",
+                    playerMac,
+                    status?.Mode ?? "unknown",
+                    expectedMode);
+            }
+            catch (Exception ex)
+            {
+                _logger.LogWarning(ex, "Error polling player {Mac} status", playerMac);
+            }
+
+            await Task.Delay(pollInterval, cancellationToken).ConfigureAwait(false);
+        }
+
+        _logger.LogWarning(
+            "Timeout waiting for player {Mac} to reach mode '{Mode}' after {Timeout}s",
+            playerMac,
+            expectedMode,
+            timeout.TotalSeconds);
+
+        return false;
+    }
+
+    /// <summary>
+    /// Waits for LMS to report a position within tolerance of the target.
+    /// Used to confirm seek operations completed.
+    /// </summary>
+    /// <param name="playerMac">The player's MAC address.</param>
+    /// <param name="targetPositionSeconds">The target position in seconds.</param>
+    /// <param name="toleranceSeconds">Acceptable tolerance (default 2 seconds).</param>
+    /// <param name="timeout">Maximum time to wait.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>True if the position was reached within the timeout.</returns>
+    public async Task<bool> WaitForSeekCompleteAsync(
+        string playerMac,
+        double targetPositionSeconds,
+        double toleranceSeconds,
+        TimeSpan timeout,
+        CancellationToken cancellationToken = default)
+    {
+        var pollInterval = TimeSpan.FromMilliseconds(Config.TransitionPollIntervalMs);
+        var startTime = DateTime.UtcNow;
+
+        _logger.LogDebug(
+            "Waiting for player {Mac} to seek to {Target}s (tolerance: {Tolerance}s, timeout: {Timeout}s)",
+            playerMac,
+            targetPositionSeconds,
+            toleranceSeconds,
+            timeout.TotalSeconds);
+
+        while (DateTime.UtcNow - startTime < timeout)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+
+            try
+            {
+                var status = await _lmsClient.GetPlayerStatusAsync(playerMac).ConfigureAwait(false);
+                if (status != null)
+                {
+                    var positionDiff = Math.Abs(status.Time - targetPositionSeconds);
+                    if (positionDiff <= toleranceSeconds)
+                    {
+                        _logger.LogDebug(
+                            "Player {Mac} reached position {Position}s (target: {Target}s) after {Elapsed}ms",
+                            playerMac,
+                            status.Time,
+                            targetPositionSeconds,
+                            (DateTime.UtcNow - startTime).TotalMilliseconds);
+                        return true;
+                    }
+
+                    _logger.LogDebug(
+                        "Player {Mac} at position {Position}s, waiting for {Target}s (diff: {Diff}s)",
+                        playerMac,
+                        status.Time,
+                        targetPositionSeconds,
+                        positionDiff);
+                }
+            }
+            catch (Exception ex)
+            {
+                _logger.LogWarning(ex, "Error polling player {Mac} status during seek", playerMac);
+            }
+
+            await Task.Delay(pollInterval, cancellationToken).ConfigureAwait(false);
+        }
+
+        _logger.LogWarning(
+            "Timeout waiting for player {Mac} to seek to {Target}s after {Timeout}s",
+            playerMac,
+            targetPositionSeconds,
+            timeout.TotalSeconds);
+
+        return false;
+    }
+
+    /// <summary>
+    /// Executes an action with automatic retry on failure.
+    /// </summary>
+    /// <param name="action">The async action to execute.</param>
+    /// <param name="maxRetries">Maximum number of retries.</param>
+    /// <param name="onRetry">Optional callback when retrying.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>True if the action succeeded within retry limit.</returns>
+    public async Task<bool> ExecuteWithRetryAsync(
+        Func<Task<bool>> action,
+        int maxRetries,
+        Action<int>? onRetry = null,
+        CancellationToken cancellationToken = default)
+    {
+        var retryCount = 0;
+        var baseDelayMs = 500;
+
+        while (retryCount <= maxRetries)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+
+            try
+            {
+                if (await action().ConfigureAwait(false))
+                {
+                    return true;
+                }
+            }
+            catch (Exception ex) when (retryCount < maxRetries)
+            {
+                _logger.LogWarning(ex, "Action failed, will retry ({Retry}/{Max})", retryCount + 1, maxRetries);
+            }
+
+            retryCount++;
+            if (retryCount <= maxRetries)
+            {
+                onRetry?.Invoke(retryCount);
+
+                // Exponential backoff: 500ms, 1000ms, 2000ms, etc.
+                var delayMs = baseDelayMs * (int)Math.Pow(2, retryCount - 1);
+                _logger.LogDebug("Retrying in {Delay}ms (attempt {Retry}/{Max})", delayMs, retryCount, maxRetries);
+                await Task.Delay(delayMs, cancellationToken).ConfigureAwait(false);
+            }
+        }
+
+        return false;
+    }
+}

Jellyfin.Plugin.JellyLMS/Services/PlaybackStateMachine.cs

@@ -0,0 +1,234 @@
+using System;
+using System.Collections.Generic;
+using Jellyfin.Plugin.JellyLMS.Models;
+using Microsoft.Extensions.Logging;
+
+namespace Jellyfin.Plugin.JellyLMS.Services;
+
+/// <summary>
+/// Event args for state transitions.
+/// </summary>
+public class StateTransitionEventArgs : EventArgs
+{
+    /// <summary>
+    /// Gets the state before the transition.
+    /// </summary>
+    public PlaybackState FromState { get; init; }
+
+    /// <summary>
+    /// Gets the state after the transition.
+    /// </summary>
+    public PlaybackState ToState { get; init; }
+
+    /// <summary>
+    /// Gets the reason for the transition.
+    /// </summary>
+    public string? Reason { get; init; }
+}
+
+/// <summary>
+/// Manages playback state transitions with validation.
+/// </summary>
+public class PlaybackStateMachine
+{
+    private readonly object _lock = new();
+    private readonly ILogger? _logger;
+    private PlaybackState _currentState = PlaybackState.Idle;
+    private PlaybackState _stateBeforeSeek = PlaybackState.Idle;
+
+    /// <summary>
+    /// Valid state transitions. Key is the current state, value is the array of valid next states.
+    /// </summary>
+    private static readonly Dictionary<PlaybackState, PlaybackState[]> ValidTransitions = new()
+    {
+        [PlaybackState.Idle] = [PlaybackState.Loading, PlaybackState.Stopped],
+        [PlaybackState.Loading] = [PlaybackState.Playing, PlaybackState.Error, PlaybackState.Stopped],
+        [PlaybackState.Playing] = [PlaybackState.Paused, PlaybackState.Seeking, PlaybackState.Loading, PlaybackState.Stopped, PlaybackState.Error],
+        [PlaybackState.Paused] = [PlaybackState.Playing, PlaybackState.Seeking, PlaybackState.Loading, PlaybackState.Stopped, PlaybackState.Error],
+        [PlaybackState.Seeking] = [PlaybackState.Playing, PlaybackState.Paused, PlaybackState.Error, PlaybackState.Stopped],
+        [PlaybackState.Error] = [PlaybackState.Loading, PlaybackState.Idle, PlaybackState.Stopped],
+        [PlaybackState.Stopped] = [PlaybackState.Idle, PlaybackState.Loading]
+    };
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="PlaybackStateMachine"/> class.
+    /// </summary>
+    /// <param name="logger">Optional logger for state transitions.</param>
+    public PlaybackStateMachine(ILogger? logger = null)
+    {
+        _logger = logger;
+    }
+
+    /// <summary>
+    /// Fired when the state changes.
+    /// </summary>
+    public event EventHandler<StateTransitionEventArgs>? StateChanged;
+
+    /// <summary>
+    /// Gets the current playback state.
+    /// </summary>
+    public PlaybackState CurrentState
+    {
+        get
+        {
+            lock (_lock)
+            {
+                return _currentState;
+            }
+        }
+    }
+
+    /// <summary>
+    /// Gets the state before the current seek operation (if in Seeking state).
+    /// Used to restore the correct state after seeking completes.
+    /// </summary>
+    public PlaybackState StateBeforeSeek
+    {
+        get
+        {
+            lock (_lock)
+            {
+                return _stateBeforeSeek;
+            }
+        }
+    }
+
+    /// <summary>
+    /// Gets a value indicating whether playback is active (Playing or Paused).
+    /// </summary>
+    public bool IsPlaybackActive
+    {
+        get
+        {
+            lock (_lock)
+            {
+                return _currentState == PlaybackState.Playing
+                    || _currentState == PlaybackState.Paused
+                    || _currentState == PlaybackState.Seeking
+                    || _currentState == PlaybackState.Loading;
+            }
+        }
+    }
+
+    /// <summary>
+    /// Attempts to transition to a new state.
+    /// </summary>
+    /// <param name="newState">The target state.</param>
+    /// <param name="reason">Optional reason for the transition (for logging).</param>
+    /// <returns>True if the transition was valid and completed.</returns>
+    public bool TryTransition(PlaybackState newState, string? reason = null)
+    {
+        lock (_lock)
+        {
+            if (_currentState == newState)
+            {
+                return true; // Already in this state
+            }
+
+            if (!IsValidTransition(_currentState, newState))
+            {
+                _logger?.LogWarning(
+                    "Invalid state transition attempted: {From} -> {To} (reason: {Reason})",
+                    _currentState,
+                    newState,
+                    reason ?? "none");
+                return false;
+            }
+
+            // Store state before seek for restoration
+            if (newState == PlaybackState.Seeking)
+            {
+                _stateBeforeSeek = _currentState;
+            }
+
+            var oldState = _currentState;
+            _currentState = newState;
+
+            _logger?.LogInformation(
+                "State transition: {From} -> {To} (reason: {Reason})",
+                oldState,
+                newState,
+                reason ?? "none");
+
+            // Fire event outside the lock to prevent deadlocks
+            var args = new StateTransitionEventArgs
+            {
+                FromState = oldState,
+                ToState = newState,
+                Reason = reason
+            };
+
+            try
+            {
+                StateChanged?.Invoke(this, args);
+            }
+            catch (Exception ex)
+            {
+                _logger?.LogError(ex, "Error in StateChanged event handler");
+            }
+
+            return true;
+        }
+    }
+
+    /// <summary>
+    /// Forces a state change without validation. Use with caution.
+    /// Intended for error recovery scenarios.
+    /// </summary>
+    /// <param name="newState">The target state.</param>
+    /// <param name="reason">Reason for the forced transition.</param>
+    public void ForceState(PlaybackState newState, string reason)
+    {
+        lock (_lock)
+        {
+            var oldState = _currentState;
+            _currentState = newState;
+
+            _logger?.LogWarning(
+                "Forced state transition: {From} -> {To} (reason: {Reason})",
+                oldState,
+                newState,
+                reason);
+
+            var args = new StateTransitionEventArgs
+            {
+                FromState = oldState,
+                ToState = newState,
+                Reason = $"FORCED: {reason}"
+            };
+
+            try
+            {
+                StateChanged?.Invoke(this, args);
+            }
+            catch (Exception ex)
+            {
+                _logger?.LogError(ex, "Error in StateChanged event handler");
+            }
+        }
+    }
+
+    /// <summary>
+    /// Resets the state machine to Idle.
+    /// </summary>
+    public void Reset()
+    {
+        ForceState(PlaybackState.Idle, "Reset");
+    }
+
+    /// <summary>
+    /// Checks if a transition from one state to another is valid.
+    /// </summary>
+    /// <param name="from">The current state.</param>
+    /// <param name="to">The target state.</param>
+    /// <returns>True if the transition is valid.</returns>
+    public static bool IsValidTransition(PlaybackState from, PlaybackState to)
+    {
+        if (!ValidTransitions.TryGetValue(from, out var validTargets))
+        {
+            return false;
+        }
+
+        return Array.IndexOf(validTargets, to) >= 0;
+    }
+}

Jellyfin.Plugin.JellyLMS/Services/WebClientPatchService.cs

@@ -0,0 +1,72 @@
+using System;
+using System.IO;
+using MediaBrowser.Common.Configuration;
+using Microsoft.Extensions.Logging;
+
+namespace Jellyfin.Plugin.JellyLMS.Services;
+
+/// <summary>
+/// Injects (or removes) a script tag in the web client's <c>index.html</c>
+/// that adds a floating button linking to the JellyLMS remote control page.
+/// This follows the pattern used by other Jellyfin plugins (e.g. Intro Skipper)
+/// since there is no official plugin hook for adding buttons to the web client.
+/// </summary>
+public static class WebClientPatchService
+{
+    private const string Marker = "<!-- jellylms-remote-button -->";
+    private const string ScriptTag = "<script defer src=\"/JellyLms/RemoteControl/ClientScript\"></script>";
+    private const string Injected = ScriptTag + Marker + "\n</body>";
+
+    /// <summary>
+    /// Ensures the web client's index.html either has or does not have the
+    /// JellyLMS remote button script injected, matching <paramref name="enableButton"/>.
+    /// </summary>
+    /// <param name="applicationPaths">The Jellyfin application paths.</param>
+    /// <param name="enableButton">Whether the remote button script should be present.</param>
+    /// <param name="logger">The logger.</param>
+    public static void Apply(IApplicationPaths applicationPaths, bool enableButton, ILogger logger)
+    {
+        var indexPath = Path.Combine(applicationPaths.WebPath, "index.html");
+
+        try
+        {
+            if (!File.Exists(indexPath))
+            {
+                logger.LogDebug("JellyLMS: web client index.html not found at {Path}", indexPath);
+                return;
+            }
+
+            var html = File.ReadAllText(indexPath);
+            var hasMarker = html.Contains(Marker, StringComparison.Ordinal);
+
+            if (enableButton && !hasMarker)
+            {
+                var patched = ReplaceLast(html, "</body>", Injected);
+                File.WriteAllText(indexPath, patched);
+                logger.LogInformation("JellyLMS: injected remote control button into {Path}", indexPath);
+            }
+            else if (!enableButton && hasMarker)
+            {
+                var patched = html.Replace(ScriptTag + Marker + "\n", string.Empty, StringComparison.Ordinal)
+                    .Replace(ScriptTag + Marker, string.Empty, StringComparison.Ordinal);
+                File.WriteAllText(indexPath, patched);
+                logger.LogInformation("JellyLMS: removed remote control button from {Path}", indexPath);
+            }
+        }
+        catch (Exception ex) when (ex is IOException or UnauthorizedAccessException)
+        {
+            logger.LogWarning(ex, "JellyLMS: failed to patch web client index.html at {Path}", indexPath);
+        }
+    }
+
+    private static string ReplaceLast(string source, string find, string replace)
+    {
+        var index = source.LastIndexOf(find, StringComparison.Ordinal);
+        if (index < 0)
+        {
+            return source;
+        }
+
+        return source[..index] + replace + source[(index + find.Length)..];
+    }
+}

Jellyfin.Plugin.JellyLMS/Web/RemoteControl.html

@@ -0,0 +1,393 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
+    <title>JellyLMS Remote</title>
+    <style>
+        :root {
+            color-scheme: dark;
+        }
+        * { box-sizing: border-box; }
+        body {
+            margin: 0;
+            font-family: -apple-system, "Helvetica Neue", Helvetica, Arial, sans-serif;
+            background: #101010;
+            color: #fff;
+            padding: 16px;
+            padding-bottom: 60px;
+        }
+        h1 {
+            font-size: 1.4em;
+            font-weight: 500;
+            margin: 8px 0 16px;
+        }
+        h2 {
+            font-size: 1.05em;
+            font-weight: 500;
+            color: #ccc;
+            margin: 24px 0 8px;
+            text-transform: uppercase;
+            letter-spacing: 0.05em;
+        }
+        .card {
+            background: #1c1c1c;
+            border-radius: 10px;
+            padding: 14px;
+            margin-bottom: 10px;
+        }
+        .player-row {
+            display: flex;
+            align-items: center;
+            gap: 12px;
+        }
+        .player-info {
+            flex: 1;
+            min-width: 0;
+        }
+        .player-name {
+            font-weight: 500;
+            font-size: 1.05em;
+            white-space: nowrap;
+            overflow: hidden;
+            text-overflow: ellipsis;
+        }
+        .player-status {
+            display: flex;
+            align-items: center;
+            gap: 6px;
+            color: #888;
+            font-size: 0.85em;
+            margin-top: 2px;
+        }
+        .status-dot {
+            width: 8px;
+            height: 8px;
+            border-radius: 50%;
+            display: inline-block;
+        }
+        .status-dot.on { background: #52b54b; }
+        .status-dot.standby { background: #f9a825; }
+        .status-dot.off { background: #f44336; }
+        .power-btn {
+            border: none;
+            border-radius: 50%;
+            width: 44px;
+            height: 44px;
+            font-size: 1.2em;
+            background: #2a2a2a;
+            color: #aaa;
+            cursor: pointer;
+            flex-shrink: 0;
+        }
+        .power-btn.on {
+            background: #00a4dc;
+            color: #fff;
+        }
+        .volume-row {
+            display: flex;
+            align-items: center;
+            gap: 10px;
+            margin-top: 10px;
+        }
+        .volume-row input[type="range"] {
+            flex: 1;
+        }
+        .volume-value {
+            width: 2.5em;
+            text-align: right;
+            color: #ccc;
+            font-size: 0.9em;
+        }
+        .sync-group-players {
+            color: #ccc;
+            flex: 1;
+        }
+        .sync-checkbox-row {
+            display: flex;
+            align-items: center;
+            gap: 10px;
+            padding: 6px 0;
+        }
+        button.action {
+            background: #00a4dc;
+            color: #fff;
+            border: none;
+            border-radius: 6px;
+            padding: 8px 14px;
+            font-size: 0.95em;
+            cursor: pointer;
+        }
+        button.action:disabled {
+            background: #333;
+            color: #777;
+            cursor: default;
+        }
+        button.action.alt {
+            background: #333;
+            color: #ccc;
+        }
+        .empty, .message {
+            color: #888;
+            padding: 8px 0;
+        }
+        .message.error { color: #f44336; }
+        .message a { color: #00a4dc; }
+        #refreshBtn {
+            position: fixed;
+            bottom: 16px;
+            right: 16px;
+        }
+    </style>
+</head>
+<body>
+    <h1>🔊 JellyLMS Remote</h1>
+    <div id="app">
+        <p class="message">Loading…</p>
+    </div>
+
+    <script>
+        var API_BASE = '/JellyLms';
+        var state = { players: [], syncGroups: [] };
+
+        function getAuthToken() {
+            try {
+                var creds = JSON.parse(localStorage.getItem('jellyfin_credentials'));
+                var server = creds && creds.Servers && creds.Servers[0];
+                return (server && server.AccessToken) || null;
+            } catch (e) {
+                return null;
+            }
+        }
+
+        function api(path, options) {
+            options = options || {};
+            var headers = options.headers || {};
+            var token = getAuthToken();
+            if (token) {
+                headers['X-Emby-Token'] = token;
+            }
+
+            if (options.body) {
+                headers['Content-Type'] = 'application/json';
+            }
+
+            return fetch(API_BASE + path, {
+                method: options.method || 'GET',
+                headers: headers,
+                body: options.body
+            }).then(function (resp) {
+                if (!resp.ok) {
+                    var err = new Error('Request failed: ' + resp.status);
+                    err.status = resp.status;
+                    throw err;
+                }
+
+                if (resp.status === 204) {
+                    return null;
+                }
+
+                var contentType = resp.headers.get('content-type') || '';
+                return contentType.indexOf('application/json') !== -1 ? resp.json() : null;
+            });
+        }
+
+        function renderMessage(text, isError) {
+            document.getElementById('app').innerHTML =
+                '<p class="message' + (isError ? ' error' : '') + '">' + text + '</p>';
+        }
+
+        function getStatusClass(player) {
+            if (!player.IsConnected) return 'off';
+            return player.IsPoweredOn ? 'on' : 'standby';
+        }
+
+        function getStatusText(player) {
+            if (!player.IsConnected) return 'Disconnected';
+            return player.IsPoweredOn ? 'Playing' : 'Standby';
+        }
+
+        function syncedMacs() {
+            var macs = new Set();
+            state.syncGroups.forEach(function (group) {
+                macs.add(group.MasterMac);
+                group.SlaveMacs.forEach(function (mac) { macs.add(mac); });
+            });
+            return macs;
+        }
+
+        function findPlayer(mac) {
+            return state.players.find(function (p) { return p.MacAddress === mac; });
+        }
+
+        function render() {
+            var app = document.getElementById('app');
+            var html = '';
+
+            html += '<h2>Players</h2>';
+            if (state.players.length === 0) {
+                html += '<p class="empty">No players found.</p>';
+            } else {
+                state.players.forEach(function (player) {
+                    var mac = player.MacAddress;
+                    html += '<div class="card">';
+                    html += '<div class="player-row">';
+                    html += '<div class="player-info">';
+                    html += '<div class="player-name">' + player.Name + '</div>';
+                    html += '<div class="player-status"><span class="status-dot ' + getStatusClass(player) + '"></span>' +
+                        '<span>' + getStatusText(player) + '</span></div>';
+                    html += '</div>';
+                    html += '<button class="power-btn' + (player.IsPoweredOn ? ' on' : '') + '" data-action="power" data-mac="' + mac + '" data-on="' + player.IsPoweredOn + '" title="Power">⏻</button>';
+                    html += '</div>';
+                    html += '<div class="volume-row">';
+                    html += '<span>🔈</span>';
+                    html += '<input type="range" min="0" max="100" value="' + player.Volume + '" data-action="volume" data-mac="' + mac + '">';
+                    html += '<span class="volume-value">' + player.Volume + '</span>';
+                    html += '</div>';
+                    html += '</div>';
+                });
+            }
+
+            html += '<h2>Multi-Room Sync</h2>';
+            if (state.syncGroups.length > 0) {
+                state.syncGroups.forEach(function (group) {
+                    var names = [];
+                    var master = findPlayer(group.MasterMac);
+                    if (master) names.push(master.Name);
+                    group.SlaveMacs.forEach(function (mac) {
+                        var p = findPlayer(mac);
+                        if (p) names.push(p.Name);
+                    });
+
+                    html += '<div class="card">';
+                    html += '<div class="player-row">';
+                    html += '<span class="sync-group-players">' + names.join(' + ') + '</span>';
+                    html += '<button class="action alt" data-action="unsync" data-master="' + group.MasterMac + '">Unsync</button>';
+                    html += '</div>';
+                    html += '</div>';
+                });
+            }
+
+            var unsynced = state.players.filter(function (p) { return !syncedMacs().has(p.MacAddress); });
+            if (unsynced.length > 1) {
+                html += '<div class="card">';
+                html += '<p class="empty" style="margin-top:0;">Select players to sync together:</p>';
+                unsynced.forEach(function (player) {
+                    html += '<label class="sync-checkbox-row">';
+                    html += '<input type="checkbox" data-action="sync-select" data-mac="' + player.MacAddress + '">';
+                    html += '<span>' + player.Name + '</span>';
+                    html += '</label>';
+                });
+                html += '<div style="margin-top:10px;">';
+                html += '<button class="action" id="syncSelectedBtn" disabled>Sync Selected</button>';
+                html += '</div>';
+                html += '</div>';
+            } else if (state.syncGroups.length === 0) {
+                html += '<p class="empty">No players synced yet.</p>';
+            }
+
+            app.innerHTML = html;
+            attachHandlers();
+        }
+
+        function attachHandlers() {
+            document.querySelectorAll('[data-action="power"]').forEach(function (btn) {
+                btn.addEventListener('click', function () {
+                    var mac = btn.getAttribute('data-mac');
+                    var isOn = btn.getAttribute('data-on') === 'true';
+                    var endpoint = isOn ? '/Players/' + encodeURIComponent(mac) + '/PowerOff' : '/Players/' + encodeURIComponent(mac) + '/PowerOn';
+                    btn.disabled = true;
+                    api(endpoint, { method: 'POST' }).then(loadPlayers).catch(function () {
+                        btn.disabled = false;
+                    });
+                });
+            });
+
+            document.querySelectorAll('[data-action="volume"]').forEach(function (input) {
+                input.addEventListener('change', function () {
+                    var mac = input.getAttribute('data-mac');
+                    var volume = parseInt(input.value, 10);
+                    input.nextElementSibling.textContent = volume;
+                    api('/Players/' + encodeURIComponent(mac) + '/Volume', {
+                        method: 'POST',
+                        body: JSON.stringify({ Volume: volume })
+                    }).catch(function () {});
+                });
+                input.addEventListener('input', function () {
+                    input.nextElementSibling.textContent = input.value;
+                });
+            });
+
+            document.querySelectorAll('[data-action="unsync"]').forEach(function (btn) {
+                btn.addEventListener('click', function () {
+                    var masterMac = btn.getAttribute('data-master');
+                    btn.disabled = true;
+                    api('/SyncGroups/' + encodeURIComponent(masterMac), { method: 'DELETE' })
+                        .then(loadAll)
+                        .catch(function () { btn.disabled = false; });
+                });
+            });
+
+            var syncBtn = document.getElementById('syncSelectedBtn');
+            if (syncBtn) {
+                var checkboxes = document.querySelectorAll('[data-action="sync-select"]');
+                var updateSyncBtn = function () {
+                    var checked = Array.from(checkboxes).filter(function (cb) { return cb.checked; });
+                    syncBtn.disabled = checked.length < 2;
+                };
+                checkboxes.forEach(function (cb) { cb.addEventListener('change', updateSyncBtn); });
+
+                syncBtn.addEventListener('click', function () {
+                    var macs = Array.from(checkboxes).filter(function (cb) { return cb.checked; })
+                        .map(function (cb) { return cb.getAttribute('data-mac'); });
+                    if (macs.length < 2) return;
+
+                    syncBtn.disabled = true;
+                    api('/SyncGroups', {
+                        method: 'POST',
+                        body: JSON.stringify({ MasterMac: macs[0], SlaveMacs: macs.slice(1) })
+                    }).then(loadAll).catch(function () { syncBtn.disabled = false; });
+                });
+            }
+        }
+
+        function loadPlayers() {
+            return api('/Players?refresh=true').then(function (players) {
+                state.players = players || [];
+                render();
+            });
+        }
+
+        function loadSyncGroups() {
+            return api('/SyncGroups').then(function (groups) {
+                state.syncGroups = groups || [];
+            });
+        }
+
+        function loadAll() {
+            return Promise.all([loadPlayers(), loadSyncGroups()]).then(render);
+        }
+
+        function init() {
+            if (!getAuthToken()) {
+                renderMessage('Please <a href="/web/">log in to Jellyfin</a> first, then reload this page.', true);
+                return;
+            }
+
+            api('/RemoteControl/Access').then(function () {
+                loadAll().catch(function () {
+                    renderMessage('Failed to load players. Check the JellyLMS plugin configuration.', true);
+                });
+            }).catch(function (err) {
+                if (err.status === 403) {
+                    renderMessage('Your account does not have permission to use the multi-room remote. Ask an admin to grant "Allow remote control of other users".', true);
+                } else {
+                    renderMessage('Could not reach JellyLMS. <a href="/web/">Return to Jellyfin</a>.', true);
+                }
+            });
+        }
+
+        init();
+    </script>
+</body>
+</html>

Jellyfin.Plugin.JellyLMS/Web/remote-button.js

@@ -0,0 +1,49 @@
+(function () {
+    function getAuthToken() {
+        try {
+            var creds = JSON.parse(localStorage.getItem('jellyfin_credentials'));
+            var server = creds && creds.Servers && creds.Servers[0];
+            return (server && server.AccessToken) || null;
+        } catch (e) {
+            return null;
+        }
+    }
+
+    function addButton() {
+        if (document.getElementById('jellylms-remote-btn')) {
+            return;
+        }
+
+        var btn = document.createElement('a');
+        btn.id = 'jellylms-remote-btn';
+        btn.href = '/JellyLms/RemoteControl';
+        btn.title = 'Multi-room Remote';
+        btn.textContent = '🔊';
+        btn.style.cssText = 'position:fixed;bottom:20px;right:20px;width:48px;height:48px;' +
+            'border-radius:50%;background:#00a4dc;color:#fff;display:flex;' +
+            'align-items:center;justify-content:center;font-size:22px;' +
+            'text-decoration:none;z-index:99999;box-shadow:0 2px 8px rgba(0,0,0,0.5);';
+        document.body.appendChild(btn);
+    }
+
+    function init() {
+        var token = getAuthToken();
+        if (!token) {
+            return;
+        }
+
+        fetch('/JellyLms/RemoteControl/Access', { headers: { 'X-Emby-Token': token } })
+            .then(function (resp) {
+                if (resp.ok) {
+                    addButton();
+                }
+            })
+            .catch(function () {});
+    }
+
+    if (document.readyState === 'loading') {
+        document.addEventListener('DOMContentLoaded', init);
+    } else {
+        init();
+    }
+})();

README.md

@@ -32,14 +32,14 @@ JellyLMS enables Jellyfin to stream audio to LMS, which acts as a multi-room spe
 │  │  (Audio)  │  │         │                 │         │  │  (Zones)  │  │
 │  └───────────┘  │         │  ┌───────────┐  │         │  └───────────┘  │
 │                 │         │  │  Session  │  │         │                 │
-│  ┌───────────┐  │         │  │ Manager   │  │         │  ┌───────────┐  │
+│  ┌───────────┐  │         │  │Controller │  │         │  ┌───────────┐  │
-│  │   Queue   │──┼────────►│  └───────────┘  │────────►│  │  Sync     │  │
+│  │   Queue   │──┼────────►│  │  (State   │  │────────►│  │  Sync     │  │
-│  │           │  │         │                 │         │  │  Groups   │  │
+│  │           │  │         │  │  Machine) │  │         │  │  Groups   │  │
-│  └───────────┘  │         │  ┌───────────┐  │         │  └───────────┘  │
+│  └───────────┘  │         │  └───────────┘  │         │  └───────────┘  │
-│                 │         │  │ REST API  │  │         │                 │
+│                 │         │                 │         │                 │
-│  ┌───────────┐  │         │  │Controller │  │         │                 │
+│  ┌───────────┐  │         │  ┌───────────┐  │         │                 │
-│  │ Playback  │──┼────────►│  └───────────┘  │         │                 │
+│  │ Playback  │──┼────────►│  │ REST API  │  │         │                 │
-│  │ Controls  │  │         │                 │         │                 │
+│  │ Controls  │  │         │  └───────────┘  │         │                 │
 │  └───────────┘  │         └─────────────────┘         └─────────────────┘
 └─────────────────┘
 ```
@@ -48,8 +48,9 @@ JellyLMS enables Jellyfin to stream audio to LMS, which acts as a multi-room spe
 
 - **Player Discovery**: Automatically discovers all LMS players/zones
 - **Multi-Room Sync**: Create and manage sync groups for synchronized playback across multiple rooms
-- **Playback Control**: Play, pause, stop, seek, and volume control forwarded to LMS
+- **Playback Control**: Play, pause, stop, seek, and volume control via Jellyfin's "Play On" (cast) interface
 - **Stream Bridging**: Generates audio stream URLs from Jellyfin for LMS to consume
+- **Robust State Machine**: Ensures proper sequencing of playback operations with automatic retry and timeout handling
 
 ## Screenshots
 
@@ -76,9 +77,62 @@ Create and manage synchronized playback groups for multi-room audio:
 ## Requirements
 
 - Jellyfin Server 10.10.0 or later
-- .NET 8.0 Runtime
+- .NET 9.0 Runtime
 - Logitech Media Server (LMS) with JSON-RPC API enabled (default on port 9000)
 
+## Playback Architecture
+
+JellyLMS uses Jellyfin's native "Play On" (cast) interface to control LMS players. When you select an LMS player from Jellyfin's cast menu, playback is managed through a robust state machine that ensures reliable operation.
+
+### State Machine
+
+The playback controller uses a state machine to ensure proper sequencing of operations:
+
+```
+                    ┌────────┐
+                    │  Idle  │  (device connected, no media)
+                    └───┬────┘
+                        │ Play command
+                        ▼
+                    ┌────────┐
+              ┌────►│Loading │◄────┐
+              │     └───┬────┘     │
+              │         │          │ Seek (HTTP streaming
+              │   LMS confirms     │ restarts stream)
+              │   mode="play"      │
+              │         ▼          │
+┌───────┐     │     ┌────────┐     │
+│ Error │◄────┼─────│Playing │─────┘
+└───┬───┘     │     └───┬────┘
+    │         │         │ Pause
+  retry       │         ▼
+    │         │     ┌────────┐
+    └─────────┼─────│ Paused │
+              │     └───┬────┘
+              │         │ Seek (native LMS)
+              │         ▼
+              │     ┌────────┐
+              └─────│Seeking │
+                    └────────┘
+
+From any state: Stop → Stopped
+```
+
+### How Playback Works
+
+1. **Cast Request**: User selects an LMS player from Jellyfin's "Play On" menu
+2. **Loading**: Plugin sends play command to LMS and transitions to Loading state
+3. **Confirmation**: Plugin polls LMS until playback is confirmed (mode="play")
+4. **Playing**: Playback is active; progress is synced between Jellyfin and LMS
+5. **Controls**: Play, pause, seek, and volume commands are forwarded to LMS
+
+### Error Handling
+
+The state machine includes automatic retry with exponential backoff:
+- **Timeout errors**: Auto-retry up to 2 times (500ms → 1s delay)
+- **Network errors**: Auto-retry up to 2 times
+- **LMS errors**: No retry, transition to Error state
+
 ## Installation
 
 ### Manual Installation
@@ -101,7 +155,7 @@ cd jellyLMS
 dotnet build Jellyfin.Plugin.JellyLMS.sln -c Release
 
 # The DLL will be in:
-# Jellyfin.Plugin.JellyLMS/bin/Release/net8.0/
+# Jellyfin.Plugin.JellyLMS/bin/Release/net9.0/
 ```
 
 ## Configuration
@@ -116,41 +170,45 @@ dotnet build Jellyfin.Plugin.JellyLMS.sln -c Release
 | Connection Timeout | Timeout for LMS API calls (seconds) | `10` |
 | Enable Auto Sync | Automatically sync players when creating groups | `true` |
 | Default Player | MAC address of the default player | (none) |
+| Use Direct File Path | Enable direct file access instead of HTTP streaming | `false` |
+
+### Advanced Settings (State Machine)
+
+| Setting | Description | Default |
+|---------|-------------|---------|
+| Loading Timeout | Max time to wait for LMS to start playback (seconds) | `5` |
+| Seek Timeout | Max time to wait for seek to complete (seconds) | `3` |
+| Transition Poll Interval | How often to poll LMS during state transitions (ms) | `300` |
+| Max Auto Retries | Number of automatic retries for transient failures | `2` |
 
 3. Click "Test Connection" to verify connectivity to LMS
 4. Use "Discover Players" to see available LMS players
 
 ## API Endpoints
 
-The plugin exposes REST API endpoints under `/JellyLms/`:
+The plugin exposes REST API endpoints under `/JellyLms/` for player and sync group management.
+
+**Note:** Playback control (play, pause, seek, volume) is handled through Jellyfin's native "Play On" (cast) interface, not through REST endpoints.
 
 ### Players
 
 - `GET /JellyLms/Players` - List all LMS players
 - `GET /JellyLms/Players/{mac}` - Get specific player details
-- `POST /JellyLms/Players/Refresh` - Refresh player list from LMS
+- `POST /JellyLms/Players/{mac}/PowerOn` - Power on a player
+- `POST /JellyLms/Players/{mac}/PowerOff` - Power off a player
+- `POST /JellyLms/Players/{mac}/Volume` - Set player volume
 
 ### Sync Groups
 
 - `GET /JellyLms/SyncGroups` - List all sync groups
 - `POST /JellyLms/SyncGroups` - Create a new sync group
 - `DELETE /JellyLms/SyncGroups/{masterMac}` - Dissolve a sync group
-- `DELETE /JellyLms/SyncGroups/{masterMac}/Players/{slaveMac}` - Remove player from group
+- `DELETE /JellyLms/SyncGroups/Players/{mac}` - Remove player from its sync group
 
-### Sessions
+### Utilities
 
-- `GET /JellyLms/Sessions` - List active playback sessions
-- `POST /JellyLms/Sessions` - Start a new playback session
-- `POST /JellyLms/Sessions/{id}/Pause` - Pause playback
-- `POST /JellyLms/Sessions/{id}/Resume` - Resume playback
-- `POST /JellyLms/Sessions/{id}/Stop` - Stop playback
-- `POST /JellyLms/Sessions/{id}/Seek` - Seek to position
-- `POST /JellyLms/Sessions/{id}/Volume` - Set volume
-
-### Status
-
-- `GET /JellyLms/Status` - Get LMS connection status
 - `POST /JellyLms/TestConnection` - Test LMS connectivity
+- `GET /JellyLms/DiscoverPaths` - Discover file paths for direct file access configuration
 
 ## LMS Setup
 
@@ -218,15 +276,17 @@ Jellyfin.Plugin.JellyLMS/
 │   ├── PluginConfiguration.cs   # Plugin settings
 │   └── configPage.html          # Dashboard configuration UI
 ├── Api/
-│   └── JellyLmsController.cs    # REST API endpoints
+│   └── JellyLmsController.cs    # REST API endpoints (players, sync groups)
 ├── Services/
 │   ├── ILmsApiClient.cs         # LMS API interface
 │   ├── LmsApiClient.cs          # LMS JSON-RPC client
 │   ├── LmsPlayerManager.cs      # Player discovery & sync
-│   └── LmsSessionManager.cs     # Playback session management
+│   ├── LmsSessionController.cs  # Playback control (ISessionController)
+│   ├── PlaybackStateMachine.cs  # State machine for playback lifecycle
+│   └── LmsStatusPoller.cs       # Polls LMS to confirm state transitions
 └── Models/
     ├── LmsPlayer.cs             # Player model
-    ├── LmsPlaybackSession.cs    # Session state model
+    ├── LmsPlaybackSession.cs    # Session state (incl. PlaybackState enum)
     └── LmsApiModels.cs          # JSON-RPC DTOs
 ```
 
@@ -237,7 +297,7 @@ Jellyfin.Plugin.JellyLMS/
 dotnet build Jellyfin.Plugin.JellyLMS.sln
 
 # Copy to Jellyfin plugins directory
-cp Jellyfin.Plugin.JellyLMS/bin/Debug/net8.0/Jellyfin.Plugin.JellyLMS.dll \
+cp Jellyfin.Plugin.JellyLMS/bin/Debug/net9.0/Jellyfin.Plugin.JellyLMS.dll \
    ~/.local/share/jellyfin/plugins/JellyLMS/
 
 # Restart Jellyfin to load the plugin

manifest.json

@@ -6,6 +6,31 @@
     "overview": "Bridges Jellyfin audio playback to LMS for synchronized multi-room playback across Squeezebox players",
     "owner": "dtourolle",
     "category": "Music",
-        "versions": []
+    "versions": [
+      {
+        "version": "1.0.2",
+        "changelog": "Release 1.0.2",
+        "targetAbi": "10.10.0.0",
+        "sourceUrl": "https://gitea.tourolle.paris/dtourolle/jellyLMS/releases/download/v1.0.2/jellylms_1.0.2.0.zip",
+        "checksum": "43e4fcd6dc67be82a1e9d8816cdf00df",
+        "timestamp": "2026-01-25T18:35:06Z"
+      },
+      {
+        "version": "1.0.1",
+        "changelog": "Release 1.0.1",
+        "targetAbi": "10.10.0.0",
+        "sourceUrl": "https://gitea.tourolle.paris/dtourolle/jellyLMS/releases/download/v1.0.1/jellylms_1.0.1.0.zip",
+        "checksum": "093a1821b86a220cdfad49c3d93345a7",
+        "timestamp": "2025-12-30T13:43:10Z"
+      },
+      {
+        "version": "1.0.0",
+        "changelog": "Release 1.0.0",
+        "targetAbi": "10.10.0.0",
+        "sourceUrl": "https://gitea.tourolle.paris/dtourolle/jellyLMS/releases/download/v1.0.0/jellylms_1.0.0.0.zip",
+        "checksum": "b6194d5ceb5ec0ea711a48f6d34a290d",
+        "timestamp": "2025-12-20T13:54:14Z"
+      }
+    ]
   }
 ]