feat: add CWS endpoint to get routing devices & tielines together

* visualizeroutes allows visualizing configured routes based on tielines and signal type
  * can be filtered by source key, destination key, and type, along with partial matches for source & destination keys
* visualizecurrentroutes visualizes what Essentials says is currently routed by type
  * uses same filtering as visualizeroutes
* improvements to how the routing algorithm works

.config/dotnet-tools.json

@@ -0,0 +1,13 @@
+{
+  "version": 1,
+  "isRoot": true,
+  "tools": {
+    "csharpier": {
+      "version": "1.2.4",
+      "commands": [
+        "csharpier"
+      ],
+      "rollForward": false
+    }
+  }
+}

src/PepperDash.Essentials.Core/DeviceTypeInterfaces/IAudioZone.cs

@@ -0,0 +1,10 @@
+namespace PepperDash.Essentials.Core
+{
+  /// <summary>
+  /// Defines minimum functionality for an audio zone
+  /// </summary>
+  public interface IAudioZone : IBasicVolumeWithFeedback
+  {
+    void SelectInput(ushort input);
+  }
+}

src/PepperDash.Essentials.Core/DeviceTypeInterfaces/IAudioZones.cs

@@ -0,0 +1,12 @@
+using System.Collections.Generic;
+
+namespace PepperDash.Essentials.Core
+{
+  /// <summary>
+  /// Identifies a device that contains audio zones
+  /// </summary>
+  public interface IAudioZones : IRouting
+  {
+    Dictionary<uint, IAudioZone> Zone { get; }
+  }
+}

src/PepperDash.Essentials.Core/DeviceTypeInterfaces/IBasicVolumeControls.cs

@@ -0,0 +1,27 @@
+using PepperDash.Core;
+
+namespace PepperDash.Essentials.Core
+{
+	/// <summary>
+	/// Defines minimal volume and mute control methods
+	/// </summary>
+	public interface IBasicVolumeControls : IKeyName
+	{
+		/// <summary>
+		/// Increases the volume
+		/// </summary>
+		/// <param name="pressRelease">Indicates whether the volume change is a press and hold action</param>
+		void VolumeUp(bool pressRelease);
+
+		/// <summary>
+		/// Decreases the volume
+		/// </summary>
+		/// <param name="pressRelease">Indicates whether the volume change is a press and hold action</param>
+		void VolumeDown(bool pressRelease);
+
+		/// <summary>
+		/// Toggles the mute state
+		/// </summary>
+		void MuteToggle();
+	}
+}

src/PepperDash.Essentials.Core/DeviceTypeInterfaces/IBasicVolumeWithFeedback.cs

@@ -0,0 +1,14 @@
+namespace PepperDash.Essentials.Core
+{
+  /// <summary>
+  /// Defines the contract for IBasicVolumeWithFeedback
+  /// </summary>
+  public interface IBasicVolumeWithFeedback : IBasicVolumeControls
+  {
+    BoolFeedback MuteFeedback { get; }
+    void MuteOn();
+    void MuteOff();
+    void SetVolume(ushort level);
+    IntFeedback VolumeLevelFeedback { get; }
+  }
+}

src/PepperDash.Essentials.Core/DeviceTypeInterfaces/IBasicVolumeWithFeedbackAdvanced.cs

@@ -0,0 +1,12 @@
+namespace PepperDash.Essentials.Core
+{
+  /// <summary>
+  /// Defines the contract for IBasicVolumeWithFeedbackAdvanced
+  /// </summary>
+  public interface IBasicVolumeWithFeedbackAdvanced : IBasicVolumeWithFeedback
+  {
+    int RawVolumeLevel { get; }
+
+    eVolumeLevelUnits Units { get; }
+  }
+}

src/PepperDash.Essentials.Core/DeviceTypeInterfaces/IFullAudioSettings.cs

@@ -0,0 +1,41 @@
+namespace PepperDash.Essentials.Core
+{
+  /// <summary>
+  /// Defines the contract for IFullAudioSettings
+  /// </summary>
+  public interface IFullAudioSettings : IBasicVolumeWithFeedback
+  {
+    void SetBalance(ushort level);
+    void BalanceLeft(bool pressRelease);
+    void BalanceRight(bool pressRelease);
+
+    void SetBass(ushort level);
+    void BassUp(bool pressRelease);
+    void BassDown(bool pressRelease);
+
+    void SetTreble(ushort level);
+    void TrebleUp(bool pressRelease);
+    void TrebleDown(bool pressRelease);
+
+    bool hasMaxVolume { get; }
+    void SetMaxVolume(ushort level);
+    void MaxVolumeUp(bool pressRelease);
+    void MaxVolumeDown(bool pressRelease);
+
+    bool hasDefaultVolume { get; }
+    void SetDefaultVolume(ushort level);
+    void DefaultVolumeUp(bool pressRelease);
+    void DefaultVolumeDown(bool pressRelease);
+
+    void LoudnessToggle();
+    void MonoToggle();
+
+    BoolFeedback LoudnessFeedback { get; }
+    BoolFeedback MonoFeedback { get; }
+    IntFeedback BalanceFeedback { get; }
+    IntFeedback BassFeedback { get; }
+    IntFeedback TrebleFeedback { get; }
+    IntFeedback MaxVolumeFeedback { get; }
+    IntFeedback DefaultVolumeFeedback { get; }
+  }
+}

src/PepperDash.Essentials.Core/DeviceTypeInterfaces/IHasCurrentVolumeControls.cs

@@ -0,0 +1,17 @@
+using System;
+
+namespace PepperDash.Essentials.Core
+{
+  /// <summary>
+  /// Defines the contract for IHasCurrentVolumeControls
+  /// </summary>
+  public interface IHasCurrentVolumeControls
+  {
+    IBasicVolumeControls CurrentVolumeControls { get; }
+    event EventHandler<VolumeDeviceChangeEventArgs> CurrentVolumeDeviceChange;
+
+    void SetDefaultLevels();
+
+    bool ZeroVolumeWhenSwtichingVolumeDevices { get; }
+  }
+}

src/PepperDash.Essentials.Core/DeviceTypeInterfaces/IHasMuteControl.cs

@@ -0,0 +1,10 @@
+namespace PepperDash.Essentials.Core
+{
+  /// <summary>
+  /// Defines basic mute control methods
+  /// </summary>
+  public interface IHasMuteControl
+  {
+    void MuteToggle();
+  }
+}

src/PepperDash.Essentials.Core/DeviceTypeInterfaces/IHasMuteControlWithFeedback.cs

@@ -0,0 +1,12 @@
+namespace PepperDash.Essentials.Core
+{
+  /// <summary>
+  /// Defines mute control methods and properties with feedback
+  /// </summary>
+  public interface IHasMuteControlWithFeedback : IHasMuteControl
+  {
+    BoolFeedback MuteFeedback { get; }
+    void MuteOn();
+    void MuteOff();
+  }
+}

src/PepperDash.Essentials.Core/DeviceTypeInterfaces/IHasVolumeControl.cs

@@ -0,0 +1,11 @@
+namespace PepperDash.Essentials.Core
+{
+  /// <summary>
+  /// Defines the contract for IHasVolumeControl
+  /// </summary>
+  public interface IHasVolumeControl
+  {
+    void VolumeUp(bool pressRelease);
+    void VolumeDown(bool pressRelease);
+  }
+}

src/PepperDash.Essentials.Core/DeviceTypeInterfaces/IHasVolumeControlWithFeedback.cs

@@ -0,0 +1,11 @@
+namespace PepperDash.Essentials.Core
+{
+  /// <summary>
+  /// Defines volume control methods and properties with feedback
+  /// </summary>
+  public interface IHasVolumeControlWithFeedback : IHasVolumeControl
+  {
+    void SetVolume(ushort level);
+    IntFeedback VolumeLevelFeedback { get; }
+  }
+}

src/PepperDash.Essentials.Core/DeviceTypeInterfaces/IHasVolumeDevice.cs

@@ -0,0 +1,10 @@
+namespace PepperDash.Essentials.Core
+{
+  /// <summary>
+  /// Defines the contract for IHasVolumeDevice
+  /// </summary>
+  public interface IHasVolumeDevice
+  {
+    IBasicVolumeControls VolumeDevice { get; }
+  }
+}

src/PepperDash.Essentials.Core/DeviceTypeInterfaces/eVolumeLevelUnits.cs

@@ -0,0 +1,10 @@
+namespace PepperDash.Essentials.Core
+{
+  public enum eVolumeLevelUnits
+  {
+    Decibels,
+    Percent,
+    Relative,
+    Absolute
+  }
+}

src/PepperDash.Essentials.Core/Devices/DeviceManager.cs

@@ -436,14 +436,14 @@ namespace PepperDash.Essentials.Core
                 CrestronConsole.ConsoleCommandResponse("Device {0} has {1} Input Ports:{2}", s, inputPorts.Count, CrestronEnvironment.NewLine);
                 foreach (var routingInputPort in inputPorts)
                 {
-                    CrestronConsole.ConsoleCommandResponse("{0}{1}", routingInputPort.Key, CrestronEnvironment.NewLine);
+                    CrestronConsole.ConsoleCommandResponse("key: {0} signalType: {1}{2}", routingInputPort.Key, routingInputPort.Type, CrestronEnvironment.NewLine);
                 }
             }
             if (outputPorts == null) return;
             CrestronConsole.ConsoleCommandResponse("Device {0} has {1} Output Ports:{2}", s, outputPorts.Count, CrestronEnvironment.NewLine);
             foreach (var routingOutputPort in outputPorts)
             {
-                CrestronConsole.ConsoleCommandResponse("{0}{1}", routingOutputPort.Key, CrestronEnvironment.NewLine);
+                CrestronConsole.ConsoleCommandResponse("key: {0} signalType: {1}{2}", routingOutputPort.Key, routingOutputPort.Type, CrestronEnvironment.NewLine);
             }
         }
 

src/PepperDash.Essentials.Core/Devices/IVolumeAndAudioInterfaces.cs

@@ -1,161 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using Crestron.SimplSharp;
-
-namespace PepperDash.Essentials.Core
-{
-	/// <summary>
-	/// Defines minimal volume and mute control methods
-	/// </summary>
-    public interface IBasicVolumeControls 
-	{
-		void VolumeUp(bool pressRelease);
-		void VolumeDown(bool pressRelease);
-		void MuteToggle();
-	}
-
-    /// <summary>
-    /// Defines the contract for IHasVolumeControl
-    /// </summary>
-    public interface IHasVolumeControl
-    {
-        void VolumeUp(bool pressRelease);
-        void VolumeDown(bool pressRelease);
-    }
-
-    /// <summary>
-    /// Defines volume control methods and properties with feedback
-    /// </summary>
-    public interface IHasVolumeControlWithFeedback : IHasVolumeControl
-    {
-        void SetVolume(ushort level);
-        IntFeedback VolumeLevelFeedback { get; }
-    }
-
-    /// <summary>
-    /// Defines basic mute control methods
-    /// </summary>
-    public interface IHasMuteControl
-    {
-        void MuteToggle();
-    }
-
-    /// <summary>
-    /// Defines mute control methods and properties with feedback
-    /// </summary>
-    public interface IHasMuteControlWithFeedback : IHasMuteControl
-    {
-        BoolFeedback MuteFeedback { get; }
-        void MuteOn();
-        void MuteOff();
-    }
-
-    /// <summary>
-    /// Defines the contract for IBasicVolumeWithFeedback
-    /// </summary>
-    public interface IBasicVolumeWithFeedback : IBasicVolumeControls
-	{
-		BoolFeedback MuteFeedback { get; }
-        void MuteOn();
-        void MuteOff();
-		void SetVolume(ushort level);
-		IntFeedback VolumeLevelFeedback { get; }
-	}
-
- /// <summary>
- /// Defines the contract for IBasicVolumeWithFeedbackAdvanced
- /// </summary>
-	public interface IBasicVolumeWithFeedbackAdvanced : IBasicVolumeWithFeedback
-	{
-		int RawVolumeLevel { get; }
-
-		eVolumeLevelUnits Units { get; }
-	}
-
-    public enum eVolumeLevelUnits
-    {
-        Decibels,
-        Percent,
-        Relative,
-        Absolute
-    }
-
-    /// <summary>
-    /// Defines the contract for IHasCurrentVolumeControls
-    /// </summary>
-    public interface IHasCurrentVolumeControls
-    {
-        IBasicVolumeControls CurrentVolumeControls { get; }
-		event EventHandler<VolumeDeviceChangeEventArgs> CurrentVolumeDeviceChange;
-
-        void SetDefaultLevels();
-
-        bool ZeroVolumeWhenSwtichingVolumeDevices { get; }
-	}
-
-
- /// <summary>
- /// Defines the contract for IFullAudioSettings
- /// </summary>
-	public interface IFullAudioSettings : IBasicVolumeWithFeedback
-	{
-		void SetBalance(ushort level);
-		void BalanceLeft(bool pressRelease);
-		void BalanceRight(bool pressRelease);
-
-		void SetBass(ushort level);
-		void BassUp(bool pressRelease);
-		void BassDown(bool pressRelease);
-
-		void SetTreble(ushort level);
-		void TrebleUp(bool pressRelease);
-		void TrebleDown(bool pressRelease);
-
-		bool hasMaxVolume { get; }
-		void SetMaxVolume(ushort level);
-		void MaxVolumeUp(bool pressRelease);
-		void MaxVolumeDown(bool pressRelease);
-
-		bool hasDefaultVolume { get; }
-		void SetDefaultVolume(ushort level);
-		void DefaultVolumeUp(bool pressRelease);
-		void DefaultVolumeDown(bool pressRelease);
-
-		void LoudnessToggle();
-		void MonoToggle();
-
-		BoolFeedback LoudnessFeedback { get; }
-		BoolFeedback MonoFeedback { get; }
-		IntFeedback BalanceFeedback { get; }
-		IntFeedback BassFeedback { get; }
-		IntFeedback TrebleFeedback { get; }
-		IntFeedback MaxVolumeFeedback { get; }
-		IntFeedback DefaultVolumeFeedback { get; }
-	}
-
- /// <summary>
- /// Defines the contract for IHasVolumeDevice
- /// </summary>
-	public interface IHasVolumeDevice
-	{
-		IBasicVolumeControls VolumeDevice { get; }
-	}
-
-	/// <summary>
-	/// Identifies a device that contains audio zones
-	/// </summary>
-	public interface IAudioZones : IRouting
-	{
-		Dictionary<uint, IAudioZone> Zone { get; }
-	}
-
-	/// <summary>
-	/// Defines minimum functionality for an audio zone
-	/// </summary>
-	public interface IAudioZone : IBasicVolumeWithFeedback
-	{
-		void SelectInput(ushort input);
-	}
-}

src/PepperDash.Essentials.Core/Fusion/FusionCustomPropertiesBridge.cs

@@ -1,16 +1,10 @@
 
 
 using System;
-using System.Collections.Generic;
 using System.Linq;
-using System.Text;
-using Crestron.SimplSharp;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
-
 using PepperDash.Core;
-using PepperDash.Essentials.Core;
-using PepperDash.Essentials.Core.Config;
 using PepperDash.Essentials.Core.Devices;
 using Serilog.Events;
 
@@ -25,17 +19,25 @@ namespace PepperDash.Essentials.Core.Fusion
         /// <summary>
         /// Evaluates the room info and custom properties from Fusion and updates the system properties aa needed
         /// </summary>
-        /// <param name="roomInfo"></param>
-        public void EvaluateRoomInfo(string roomKey, RoomInformation roomInfo)
+        /// <param name="room">The room associated with this Fusion instance</param>
+        /// <param name="roomInfo">The room information from Fusion</param>
+        /// <param name="useFusionRoomName"></param>
+        public void EvaluateRoomInfo(IEssentialsRoom room, RoomInformation roomInfo, bool useFusionRoomName)
         {
             try
             {
-                var reconfigurableDevices = DeviceManager.AllDevices.Where(d => d is ReconfigurableDevice);
+                var reconfigurableDevices = DeviceManager.AllDevices.OfType<ReconfigurableDevice>();
 
                 foreach (var device in reconfigurableDevices)
                 {
                     // Get the current device config so new values can be overwritten over existing
-                    var deviceConfig = (device as ReconfigurableDevice).Config;
+                    var deviceConfig = device.Config;
+
+                    if (device is IEssentialsRoom)
+                    {
+                        // Skipping room name as this will affect ALL room instances in the configuration and cause unintended consequences when multiple rooms are present and multiple Fusion instances are used
+                        continue;
+                    }
 
                     if (device is RoomOnToDefaultSourceWhenOccupied)
                     {
@@ -85,36 +87,49 @@ namespace PepperDash.Essentials.Core.Fusion
 
                         deviceConfig.Properties = JToken.FromObject(devProps);
                     }
-                    else if (device is IEssentialsRoom)
-                    {
-                        // Set the room name
-                        if (!string.IsNullOrEmpty(roomInfo.Name))
-                        {
-                            Debug.LogMessage(LogEventLevel.Debug, "Current Room Name: {0}. New Room Name: {1}", deviceConfig.Name, roomInfo.Name);
-                            // Set the name in config
-                            deviceConfig.Name = roomInfo.Name;
-
-                            Debug.LogMessage(LogEventLevel.Debug, "Room Name Successfully Changed.");
-                        }
-
-                        // Set the help message
-                        var helpMessage = roomInfo.FusionCustomProperties.FirstOrDefault(p => p.ID.Equals("RoomHelpMessage"));
-                        if (helpMessage != null)
-                        {
-                            //Debug.LogMessage(LogEventLevel.Debug, "Current Help Message: {0}. New Help Message: {1}", deviceConfig.Properties["help"]["message"].Value<string>(ToString()), helpMessage.CustomFieldValue);
-                            deviceConfig.Properties["helpMessage"] = (string)helpMessage.CustomFieldValue;
-                        }
-                    }
 
                     // Set the config on the device
-                    (device as ReconfigurableDevice).SetConfig(deviceConfig);
+                    device.SetConfig(deviceConfig);
                 }
 
+                if (!(room is ReconfigurableDevice reconfigurable))
+                {
+                    Debug.LogWarning("FusionCustomPropertiesBridge: Room is not a ReconfigurableDevice. Cannot map custom properties.");
+                    return;
+                }
 
+                var roomConfig = reconfigurable.Config;
+
+                var updateConfig = false;
+
+                // Set the room name
+                if (!string.IsNullOrEmpty(roomInfo.Name) && useFusionRoomName)
+                {
+                    Debug.LogDebug("Current Room Name: {currentName}. New Room Name: {fusionName}", roomConfig.Name, roomInfo.Name);
+                    // Set the name in config
+                    roomConfig.Name = roomInfo.Name;
+                    updateConfig = true;
+
+                    Debug.LogDebug("Room Name Successfully Changed.");
+                }
+
+                // Set the help message
+                var helpMessage = roomInfo.FusionCustomProperties.FirstOrDefault(p => p.ID.Equals("RoomHelpMessage"));
+                if (helpMessage != null)
+                {
+                    roomConfig.Properties["helpMessage"] = helpMessage.CustomFieldValue;
+                    updateConfig = true;
+                }
+
+                if (updateConfig)
+                {
+                    reconfigurable.SetConfig(roomConfig);
+                }
             }
             catch (Exception e)
             {
-                Debug.LogMessage(LogEventLevel.Debug, "FusionCustomPropetiesBridge: Error mapping properties: {0}", e);
+                Debug.LogError("FusionCustomPropetiesBridge: Exception mapping properties for {roomKey}: {message}", room.Key, e.Message);
+                Debug.LogDebug(e, "Stack Trace: ");
             }
         }
     }

src/PepperDash.Essentials.Core/Fusion/IEssentialsRoomFusionController.cs

@@ -1,4 +1,9 @@
-using Crestron.SimplSharp;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Timers;
+using Crestron.SimplSharp;
 using Crestron.SimplSharp.CrestronIO;
 using Crestron.SimplSharp.CrestronXml;
 using Crestron.SimplSharp.CrestronXml.Serialization;
@@ -10,11 +15,6 @@ using PepperDash.Core.Logging;
 using PepperDash.Essentials.Core.Config;
 using PepperDash.Essentials.Core.DeviceTypeInterfaces;
 using Serilog.Events;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Timers;
 
 namespace PepperDash.Essentials.Core.Fusion
 {
@@ -1091,7 +1091,7 @@ namespace PepperDash.Essentials.Core.Fusion
                         }
                         RoomInfoChange?.Invoke(this, new EventArgs());
 
-                        CustomPropertiesBridge.EvaluateRoomInfo(Room.Key, roomInformation);
+                        CustomPropertiesBridge.EvaluateRoomInfo(Room, roomInformation, _config.UseFusionRoomName);
                     }
                 }
                 catch (Exception e)

src/PepperDash.Essentials.Core/Fusion/IEssentialsRoomFusionControllerPropertiesConfig.cs

@@ -27,7 +27,7 @@ public class IEssentialsRoomFusionControllerPropertiesConfig
             }
             else
             {
-                Debug.LogWarning( "Failed to parse IpId '{0}' as UInt16", IpId);
+                Debug.LogWarning("Failed to parse IpId '{0}' as UInt16", IpId);
                 return 0;
             }
         }
@@ -45,6 +45,13 @@ public class IEssentialsRoomFusionControllerPropertiesConfig
     [JsonProperty("roomKey")]
     public string RoomKey { get; set; }
 
+    /// <summary>
+    /// Gets or sets whether to use the Fusion room name for this room
+    /// </summary>
+    /// <remarks>Defaults to true to preserve current behavior. Set to false to skip updating the room name from Fusion</remarks>
+    [JsonProperty("useFusionRoomName")]
+    public bool UseFusionRoomName { get; set; } = true;
+
     /// <summary>
     /// Gets or sets whether to use HTML format for help requests
     /// </summary>

src/PepperDash.Essentials.Core/Routing/Extensions.cs

@@ -18,6 +18,20 @@ namespace PepperDash.Essentials.Core
     /// </summary>
     public static class Extensions
     {
+
+        /// <summary>
+        /// A collection of RouteDescriptors for each signal type.
+        /// </summary>
+        public static readonly Dictionary<eRoutingSignalType, RouteDescriptorCollection> RouteDescriptors = new Dictionary<eRoutingSignalType, RouteDescriptorCollection>()
+        {
+            { eRoutingSignalType.Audio, new RouteDescriptorCollection() },
+            { eRoutingSignalType.Video, new RouteDescriptorCollection() },
+            { eRoutingSignalType.SecondaryAudio, new RouteDescriptorCollection() },
+            { eRoutingSignalType.AudioVideo, new RouteDescriptorCollection() },
+            { eRoutingSignalType.UsbInput, new RouteDescriptorCollection() },
+            { eRoutingSignalType.UsbOutput, new RouteDescriptorCollection() }
+        };
+
         /// <summary>
         /// Stores pending route requests, keyed by the destination device key.
         /// Used primarily to handle routing requests while a device is cooling down.
@@ -29,6 +43,105 @@ namespace PepperDash.Essentials.Core
         /// </summary>
         private static readonly GenericQueue routeRequestQueue = new GenericQueue("routingQueue");
 
+        /// <summary>
+        /// Indexed lookup of TieLines by destination device key for faster queries.
+        /// </summary>
+        private static Dictionary<string, List<TieLine>> _tieLinesByDestination;
+
+        /// <summary>
+        /// Indexed lookup of TieLines by source device key for faster queries.
+        /// </summary>
+        private static Dictionary<string, List<TieLine>> _tieLinesBySource;
+
+        /// <summary>
+        /// Cache of failed route attempts to avoid re-checking impossible paths.
+        /// Format: "sourceKey|destKey|signalType"
+        /// </summary>
+        private static readonly HashSet<string> _impossibleRoutes = new HashSet<string>();
+
+        /// <summary>
+        /// Indexes all TieLines by source and destination device keys for faster lookups.
+        /// Should be called once at system startup after all TieLines are created.
+        /// </summary>
+        public static void IndexTieLines()
+        {
+            try
+            {
+                Debug.LogMessage(LogEventLevel.Information, "Indexing TieLines for faster route discovery");
+
+                _tieLinesByDestination = TieLineCollection.Default
+                    .GroupBy(t => t.DestinationPort.ParentDevice.Key)
+                    .ToDictionary(g => g.Key, g => g.ToList());
+
+                _tieLinesBySource = TieLineCollection.Default
+                    .GroupBy(t => t.SourcePort.ParentDevice.Key)
+                    .ToDictionary(g => g.Key, g => g.ToList());
+
+                Debug.LogMessage(LogEventLevel.Information, "TieLine indexing complete. {0} destination keys, {1} source keys",
+                    null, _tieLinesByDestination.Count, _tieLinesBySource.Count);
+            }
+            catch (Exception ex)
+            {
+                Debug.LogError("Exception indexing TieLines: {exception}", ex.Message);
+                Debug.LogDebug(ex, "Stack Trace: ");
+            }
+        }
+
+        /// <summary>
+        /// Gets TieLines connected to a destination device.
+        /// Uses indexed lookup if available, otherwise falls back to LINQ query.
+        /// </summary>
+        /// <param name="destinationKey">The destination device key</param>
+        /// <returns>List of TieLines connected to the destination</returns>
+        private static IEnumerable<TieLine> GetTieLinesForDestination(string destinationKey)
+        {
+            if (_tieLinesByDestination != null && _tieLinesByDestination.TryGetValue(destinationKey, out List<TieLine> tieLines))
+            {
+                return tieLines;
+            }
+
+            // Fallback to LINQ if index not available
+            return TieLineCollection.Default.Where(t => t.DestinationPort.ParentDevice.Key == destinationKey);
+        }
+
+        /// <summary>
+        /// Gets TieLines connected to a source device.
+        /// Uses indexed lookup if available, otherwise falls back to LINQ query.
+        /// </summary>
+        /// <param name="sourceKey">The source device key</param>
+        /// <returns>List of TieLines connected to the source</returns>
+        private static IEnumerable<TieLine> GetTieLinesForSource(string sourceKey)
+        {
+            if (_tieLinesBySource != null && _tieLinesBySource.TryGetValue(sourceKey, out List<TieLine> tieLines))
+            {
+                return tieLines;
+            }
+
+            // Fallback to LINQ if index not available
+            return TieLineCollection.Default.Where(t => t.SourcePort.ParentDevice.Key == sourceKey);
+        }
+
+        /// <summary>
+        /// Creates a cache key for route impossibility tracking.
+        /// </summary>
+        /// <param name="sourceKey">Source device key</param>
+        /// <param name="destKey">Destination device key</param>
+        /// <param name="type">Signal type</param>
+        /// <returns>Cache key string</returns>
+        private static string GetRouteKey(string sourceKey, string destKey, eRoutingSignalType type)
+        {
+            return string.Format("{0}|{1}|{2}", sourceKey, destKey, type);
+        }
+
+        /// <summary>
+        /// Clears the impossible routes cache. Should be called if TieLines are added/removed at runtime.
+        /// </summary>
+        public static void ClearImpossibleRoutesCache()
+        {
+            _impossibleRoutes.Clear();
+            Debug.LogMessage(LogEventLevel.Information, "Impossible routes cache cleared");
+        }
+
         /// <summary>
         /// Gets any existing RouteDescriptor for a destination, clears it using ReleaseRoute
         /// and then attempts a new Route and if sucessful, stores that RouteDescriptor
@@ -173,8 +286,9 @@ namespace PepperDash.Essentials.Core
             if (!audioSuccess && !videoSuccess)
                 return (null, null);
 
-
-            return (audioRouteDescriptor, videoRouteDescriptor);
+            // Return null for descriptors that have no routes
+            return (audioSuccess && audioRouteDescriptor.Routes.Count > 0 ? audioRouteDescriptor : null,
+                    videoSuccess && videoRouteDescriptor.Routes.Count > 0 ? videoRouteDescriptor : null);
         }
 
         /// <summary>
@@ -245,6 +359,90 @@ namespace PepperDash.Essentials.Core
             routeRequestQueue.Enqueue(new RouteRequestQueueItem(RunRouteRequest, routeRequest));
         }
 
+        /// <summary>
+        /// Maps destination input ports to source output ports for all routing devices.
+        /// </summary>
+        public static void MapDestinationsToSources()
+        {
+            try
+            {
+                // Index TieLines before mapping if not already done
+                if (_tieLinesByDestination == null || _tieLinesBySource == null)
+                {
+                    IndexTieLines();
+                }
+
+                var sinks = DeviceManager.AllDevices.OfType<IRoutingInputs>().Where(d => !(d is IRoutingInputsOutputs));
+                var sources = DeviceManager.AllDevices.OfType<IRoutingOutputs>().Where(d => !(d is IRoutingInputsOutputs));
+
+                foreach (var sink in sinks)
+                {
+                    foreach (var source in sources)
+                    {
+                        foreach (var inputPort in sink.InputPorts)
+                        {
+                            foreach (var outputPort in source.OutputPorts)
+                            {
+                                var (audioOrSingleRoute, videoRoute) = sink.GetRouteToSource(source, inputPort.Type, inputPort, outputPort);
+
+                                if (audioOrSingleRoute == null && videoRoute == null)
+                                {
+                                    continue;
+                                }
+
+                                if (audioOrSingleRoute != null)
+                                {
+                                    // Only add routes that have actual switching steps
+                                    if (audioOrSingleRoute.Routes == null || audioOrSingleRoute.Routes.Count == 0)
+                                    {
+                                        continue;
+                                    }
+
+                                    // Add to the appropriate collection(s) based on signal type
+                                    // Note: A single route descriptor with combined flags (e.g., AudioVideo) will be added once per matching signal type
+                                    if (audioOrSingleRoute.SignalType.HasFlag(eRoutingSignalType.Audio))
+                                    {
+                                        RouteDescriptors[eRoutingSignalType.Audio].AddRouteDescriptor(audioOrSingleRoute);
+                                    }
+                                    if (audioOrSingleRoute.SignalType.HasFlag(eRoutingSignalType.Video))
+                                    {
+                                        RouteDescriptors[eRoutingSignalType.Video].AddRouteDescriptor(audioOrSingleRoute);
+                                    }
+                                    if (audioOrSingleRoute.SignalType.HasFlag(eRoutingSignalType.SecondaryAudio))
+                                    {
+                                        RouteDescriptors[eRoutingSignalType.SecondaryAudio].AddRouteDescriptor(audioOrSingleRoute);
+                                    }
+                                    if (audioOrSingleRoute.SignalType.HasFlag(eRoutingSignalType.UsbInput))
+                                    {
+                                        RouteDescriptors[eRoutingSignalType.UsbInput].AddRouteDescriptor(audioOrSingleRoute);
+                                    }
+                                    if (audioOrSingleRoute.SignalType.HasFlag(eRoutingSignalType.UsbOutput))
+                                    {
+                                        RouteDescriptors[eRoutingSignalType.UsbOutput].AddRouteDescriptor(audioOrSingleRoute);
+                                    }
+                                }
+                                if (videoRoute != null)
+                                {
+                                    // Only add routes that have actual switching steps
+                                    if (videoRoute.Routes == null || videoRoute.Routes.Count == 0)
+                                    {
+                                        continue;
+                                    }
+
+                                    RouteDescriptors[eRoutingSignalType.Video].AddRouteDescriptor(videoRoute);
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                Debug.LogError("Exception mapping routes: {exception}", ex.Message);
+                Debug.LogDebug(ex, "Stack Trace: ");
+            }
+        }
+
         /// <summary>
         /// Executes the actual routing based on a <see cref="RouteRequest"/>.
         /// Finds the route path, adds it to the collection, and executes the switches.
@@ -257,7 +455,51 @@ namespace PepperDash.Essentials.Core
                 if (request.Source == null)
                     return;
 
-                var (audioOrSingleRoute, videoRoute) = request.Destination.GetRouteToSource(request.Source, request.SignalType, request.DestinationPort, request.SourcePort);
+                RouteDescriptor audioOrSingleRoute = null;
+                RouteDescriptor videoRoute = null;
+
+                // Try to use pre-loaded route descriptors first
+                if (request.SignalType.HasFlag(eRoutingSignalType.AudioVideo))
+                {
+                    // For AudioVideo routes, check both Audio and Video collections
+                    if (RouteDescriptors.TryGetValue(eRoutingSignalType.Audio, out RouteDescriptorCollection audioCollection))
+                    {
+                        audioOrSingleRoute = audioCollection.Descriptors.FirstOrDefault(d =>
+                            d.Source.Key == request.Source.Key &&
+                            d.Destination.Key == request.Destination.Key &&
+                            (request.DestinationPort == null || d.InputPort?.Key == request.DestinationPort.Key));
+                    }
+
+                    if (RouteDescriptors.TryGetValue(eRoutingSignalType.Video, out RouteDescriptorCollection videoCollection))
+                    {
+                        videoRoute = videoCollection.Descriptors.FirstOrDefault(d =>
+                            d.Source.Key == request.Source.Key &&
+                            d.Destination.Key == request.Destination.Key &&
+                            (request.DestinationPort == null || d.InputPort?.Key == request.DestinationPort.Key));
+                    }
+                }
+                else
+                {
+                    // For single signal type routes
+                    var signalTypeToCheck = request.SignalType.HasFlag(eRoutingSignalType.SecondaryAudio)
+                        ? eRoutingSignalType.SecondaryAudio
+                        : request.SignalType;
+
+                    if (RouteDescriptors.TryGetValue(signalTypeToCheck, out RouteDescriptorCollection collection))
+                    {
+                        audioOrSingleRoute = collection.Descriptors.FirstOrDefault(d =>
+                            d.Source.Key == request.Source.Key &&
+                            d.Destination.Key == request.Destination.Key &&
+                            (request.DestinationPort == null || d.InputPort?.Key == request.DestinationPort.Key));
+                    }
+                }
+
+                // If no pre-loaded route found, build it dynamically
+                if (audioOrSingleRoute == null && videoRoute == null)
+                {
+                    Debug.LogMessage(LogEventLevel.Debug, "No pre-loaded route found, building dynamically", request.Destination);
+                    (audioOrSingleRoute, videoRoute) = request.Destination.GetRouteToSource(request.Source, request.SignalType, request.DestinationPort, request.SourcePort);
+                }
 
                 if (audioOrSingleRoute == null && videoRoute == null)
                     return;
@@ -321,11 +563,13 @@ namespace PepperDash.Essentials.Core
         /// </summary>
         /// <param name="destination"></param>
         /// <param name="source"></param>
-        /// <param name="destinationPort">The RoutingOutputPort whose link is being checked for a route</param>
+        /// <param name="outputPortToUse">The RoutingOutputPort whose link is being checked for a route</param>
         /// <param name="alreadyCheckedDevices">Prevents Devices from being twice-checked</param>
         /// <param name="signalType">This recursive function should not be called with AudioVideo</param>
         /// <param name="cycle">Just an informational counter</param>
         /// <param name="routeTable">The RouteDescriptor being populated as the route is discovered</param>
+        /// <param name="destinationPort">The RoutingOutputPort whose link is being checked for a route</param>
+        /// <param name="sourcePort">The source output port (optional)</param>
         /// <returns>true if source is hit</returns>
         private static bool GetRouteToSource(this IRoutingInputs destination, IRoutingOutputs source,
             RoutingOutputPort outputPortToUse, List<IRoutingInputsOutputs> alreadyCheckedDevices,
@@ -333,42 +577,54 @@ namespace PepperDash.Essentials.Core
         {
             cycle++;
 
+            // Check if this route has already been determined to be impossible
+            var routeKey = GetRouteKey(source.Key, destination.Key, signalType);
+            if (_impossibleRoutes.Contains(routeKey))
+            {
+                Debug.LogMessage(LogEventLevel.Verbose, "Route {0} is cached as impossible, skipping", null, routeKey);
+                return false;
+            }
+
             Debug.LogMessage(LogEventLevel.Verbose, "GetRouteToSource: {cycle} {sourceKey}:{sourcePortKey}--> {destinationKey}:{destinationPortKey} {type}", null, cycle, source.Key, sourcePort?.Key ?? "auto", destination.Key, destinationPort?.Key ?? "auto", signalType.ToString());
 
             RoutingInputPort goodInputPort = null;
 
+            // Use indexed lookup instead of LINQ query
+            var allDestinationTieLines = GetTieLinesForDestination(destination.Key);
+
             IEnumerable<TieLine> destinationTieLines;
             TieLine directTie = null;
 
             if (destinationPort == null)
             {
-                destinationTieLines = TieLineCollection.Default.Where(t =>
-                    t.DestinationPort.ParentDevice.Key == destination.Key && (t.Type.HasFlag(signalType) || signalType == eRoutingSignalType.AudioVideo));
+                destinationTieLines = allDestinationTieLines.Where(t =>
+                    t.Type.HasFlag(signalType) || signalType == eRoutingSignalType.AudioVideo);
             }
             else
             {
-                destinationTieLines = TieLineCollection.Default.Where(t => t.DestinationPort.ParentDevice.Key == destination.Key && t.DestinationPort.Key == destinationPort.Key && (t.Type.HasFlag(signalType)));
+                destinationTieLines = allDestinationTieLines.Where(t =>
+                    t.DestinationPort.Key == destinationPort.Key && t.Type.HasFlag(signalType));
             }
 
             // find the TieLine without a port
             if (destinationPort == null && sourcePort == null)
             {
-                directTie = destinationTieLines.FirstOrDefault(t => t.DestinationPort.ParentDevice.Key == destination.Key && t.SourcePort.ParentDevice.Key == source.Key);
+                directTie = destinationTieLines.FirstOrDefault(t => t.SourcePort.ParentDevice.Key == source.Key);
             }
             // find a tieLine to a specific destination port without a specific source port
             else if (destinationPort != null && sourcePort == null)
             {
-                directTie = destinationTieLines.FirstOrDefault(t => t.DestinationPort.ParentDevice.Key == destination.Key && t.DestinationPort.Key == destinationPort.Key && t.SourcePort.ParentDevice.Key == source.Key);
+                directTie = destinationTieLines.FirstOrDefault(t => t.DestinationPort.Key == destinationPort.Key && t.SourcePort.ParentDevice.Key == source.Key);
             }
             // find a tieline to a specific source port without a specific destination port
             else if (destinationPort == null & sourcePort != null)
             {
-                directTie = destinationTieLines.FirstOrDefault(t => t.DestinationPort.ParentDevice.Key == destination.Key && t.SourcePort.ParentDevice.Key == source.Key && t.SourcePort.Key == sourcePort.Key);
+                directTie = destinationTieLines.FirstOrDefault(t => t.SourcePort.ParentDevice.Key == source.Key && t.SourcePort.Key == sourcePort.Key);
             }
             // find a tieline to a specific source port and destination port
             else if (destinationPort != null && sourcePort != null)
             {
-                directTie = destinationTieLines.FirstOrDefault(t => t.DestinationPort.ParentDevice.Key == destination.Key && t.DestinationPort.Key == destinationPort.Key && t.SourcePort.ParentDevice.Key == source.Key && t.SourcePort.Key == sourcePort.Key);
+                directTie = destinationTieLines.FirstOrDefault(t => t.DestinationPort.Key == destinationPort.Key && t.SourcePort.ParentDevice.Key == source.Key && t.SourcePort.Key == sourcePort.Key);
             }
 
             if (directTie != null) // Found a tie directly to the source
@@ -423,6 +679,10 @@ namespace PepperDash.Essentials.Core
             if (goodInputPort == null)
             {
                 Debug.LogMessage(LogEventLevel.Verbose, "No route found to {0}", destination, source.Key);
+
+                // Cache this as an impossible route
+                _impossibleRoutes.Add(routeKey);
+
                 return false;
             }
 

src/PepperDash.Essentials.Core/Routing/RouteDescriptor.cs

@@ -95,15 +95,15 @@ namespace PepperDash.Essentials.Core
         /// Releases the usage tracking for the route and optionally clears the route on the switching devices.
         /// </summary>
         /// <param name="clearRoute">If true, attempts to clear the route on the switching devices (e.g., set input to null/0).</param>
-        
-        
+
+
         public void ReleaseRoutes(bool clearRoute = false)
         {
             foreach (var route in Routes.Where(r => r.SwitchingDevice is IRouting))
             {
                 if (route.SwitchingDevice is IRouting switchingDevice)
                 {
-                    if(clearRoute)
+                    if (clearRoute)
                     {
                         try
                         {
@@ -137,98 +137,11 @@ namespace PepperDash.Essentials.Core
         /// Returns a string representation of the route descriptor, including source, destination, and individual route steps.
         /// </summary>
         /// <returns>A string describing the route.</returns>
-        
-        
-        
         public override string ToString()
         {
             var routesText = Routes.Select(r => r.ToString()).ToArray();
-            return string.Format("Route table from {0} to {1}:\r{2}", Source.Key, Destination.Key, string.Join("\r", routesText));
+            return $"Route table from {Source.Key} to {Destination.Key} for {SignalType}:\r\n    {string.Join("\r\n    ", routesText)}";
         }
     }
 
-    /*/// <summary>
-    /// Represents an collection of individual route steps between Source and Destination
-    /// </summary>
-    /// <summary>
-    /// Represents a RouteDescriptor
-    /// </summary>
-    public class RouteDescriptor<TInputSelector, TOutputSelector>
-    {
-        /// <summary>
-        /// Gets or sets the Destination
-        /// </summary>
-        public IRoutingInputs<TInputSelector> Destination { get; private set; }
-        /// <summary>
-        /// Gets or sets the Source
-        /// </summary>
-        public IRoutingOutputs<TOutputSelector> Source { get; private set; }
-        /// <summary>
-        /// Gets or sets the SignalType
-        /// </summary>
-        public eRoutingSignalType SignalType { get; private set; }
-        public List<RouteSwitchDescriptor<TInputSelector, TOutputSelector>> Routes { get; private set; }
-
-
-        public RouteDescriptor(IRoutingOutputs<TOutputSelector> source, IRoutingInputs<TInputSelector> destination, eRoutingSignalType signalType)
-        {
-            Destination = destination;
-            Source = source;
-            SignalType = signalType;
-            Routes = new List<RouteSwitchDescriptor<TInputSelector, TOutputSelector>>();
-        }
-
-        /// <summary>
-        /// ExecuteRoutes method
-        /// </summary>
-        public void ExecuteRoutes()
-        {
-            foreach (var route in Routes)
-            {
-                Debug.LogMessage(LogEventLevel.Verbose, "ExecuteRoutes: {0}", null, route.ToString());
-
-                if (route.SwitchingDevice is IRoutingSinkWithSwitching<TInputSelector> sink)
-                {
-                    sink.ExecuteSwitch(route.InputPort.Selector);
-                    continue;
-                }
-
-                if (route.SwitchingDevice is IRouting switchingDevice)
-                {
-                    switchingDevice.ExecuteSwitch(route.InputPort.Selector, route.OutputPort.Selector, SignalType);
-
-                    route.OutputPort.InUseTracker.AddUser(Destination, "destination-" + SignalType);
-
-                    Debug.LogMessage(LogEventLevel.Verbose, "Output port {0} routing. Count={1}", null, route.OutputPort.Key, route.OutputPort.InUseTracker.InUseCountFeedback.UShortValue);
-                }
-            }
-        }
-
-        /// <summary>
-        /// ReleaseRoutes method
-        /// </summary>
-        public void ReleaseRoutes()
-        {
-            foreach (var route in Routes)
-            {
-                if (route.SwitchingDevice is IRouting<TInputSelector, TOutputSelector>)
-                {
-                    // Pull the route from the port.  Whatever is watching the output's in use tracker is
-                    // responsible for responding appropriately.
-                    route.OutputPort.InUseTracker.RemoveUser(Destination, "destination-" + SignalType);
-                    Debug.LogMessage(LogEventLevel.Verbose, "Port {0} releasing. Count={1}", null, route.OutputPort.Key, route.OutputPort.InUseTracker.InUseCountFeedback.UShortValue);
-                }
-            }
-        }
-
-        /// <summary>
-        /// ToString method
-        /// </summary>
-        /// <inheritdoc />
-        public override string ToString()
-        {
-            var routesText = Routes.Select(r => r.ToString()).ToArray();
-            return string.Format("Route table from {0} to {1}:\r{2}", Source.Key, Destination.Key, string.Join("\r", routesText));
-        }
-    }*/
 }

src/PepperDash.Essentials.Core/Routing/RouteDescriptorCollection.cs

@@ -1,7 +1,7 @@
-using PepperDash.Core;
-using Serilog.Events;
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Linq;
+using PepperDash.Core;
+using Serilog.Events;
 
 
 namespace PepperDash.Essentials.Core
@@ -11,6 +11,9 @@ namespace PepperDash.Essentials.Core
     /// </summary>
     public class RouteDescriptorCollection
     {
+        /// <summary>
+        /// Gets the default collection of RouteDescriptors.
+        /// </summary>
         public static RouteDescriptorCollection DefaultCollection
         {
             get
@@ -24,6 +27,11 @@ namespace PepperDash.Essentials.Core
 
         private readonly List<RouteDescriptor> RouteDescriptors = new List<RouteDescriptor>();
 
+        /// <summary>
+        /// Gets an enumerable collection of all RouteDescriptors in this collection.
+        /// </summary>
+        public IEnumerable<RouteDescriptor> Descriptors => RouteDescriptors.AsReadOnly();
+
         /// <summary>
         /// Adds a RouteDescriptor to the list.  If an existing RouteDescriptor for the
         /// destination exists already, it will not be added - in order to preserve
@@ -37,13 +45,29 @@ namespace PepperDash.Essentials.Core
                 return;
             }
 
-            if (RouteDescriptors.Any(t => t.Destination == descriptor.Destination)
-                && RouteDescriptors.Any(t => t.Destination == descriptor.Destination && t.InputPort != null && descriptor.InputPort != null && t.InputPort.Key == descriptor.InputPort.Key))
+            // Check if a route already exists with the same source, destination, input port, AND signal type
+            var existingRoute = RouteDescriptors.FirstOrDefault(t =>
+                t.Source == descriptor.Source &&
+                t.Destination == descriptor.Destination &&
+                t.SignalType == descriptor.SignalType &&
+                ((t.InputPort == null && descriptor.InputPort == null) ||
+                 (t.InputPort != null && descriptor.InputPort != null && t.InputPort.Key == descriptor.InputPort.Key)));
+
+            if (existingRoute != null)
             {
-                Debug.LogMessage(LogEventLevel.Debug, descriptor.Destination,
-                    "Route to [{0}] already exists in global routes table", descriptor?.Source?.Key);
+                Debug.LogMessage(LogEventLevel.Information, descriptor.Destination,
+                    "Route from {0} to {1}:{2} ({3}) already exists in this collection",
+                    descriptor?.Source?.Key,
+                    descriptor?.Destination?.Key,
+                    descriptor?.InputPort?.Key ?? "auto",
+                    descriptor?.SignalType);
                 return;
             }
+            Debug.LogMessage(LogEventLevel.Verbose, "Adding route descriptor: {0} -> {1}:{2} ({3})",
+                descriptor?.Source?.Key,
+                descriptor?.Destination?.Key,
+                descriptor?.InputPort?.Key ?? "auto",
+                descriptor?.SignalType);
             RouteDescriptors.Add(descriptor);
         }
 
@@ -57,6 +81,12 @@ namespace PepperDash.Essentials.Core
             return RouteDescriptors.FirstOrDefault(rd => rd.Destination == destination);
         }
 
+        /// <summary>
+        /// Gets the route descriptor for a specific destination and input port
+        /// </summary>
+        /// <param name="destination">The destination device</param>
+        /// <param name="inputPortKey">The input port key</param>
+        /// <returns>The matching RouteDescriptor or null if not found</returns>
         public RouteDescriptor GetRouteDescriptorForDestinationAndInputPort(IRoutingInputs destination, string inputPortKey)
         {
             Debug.LogMessage(LogEventLevel.Information, "Getting route descriptor for '{destination}':'{inputPortKey}'", destination?.Key ?? null, string.IsNullOrEmpty(inputPortKey) ? "auto" : inputPortKey);
@@ -73,7 +103,7 @@ namespace PepperDash.Essentials.Core
         {
             Debug.LogMessage(LogEventLevel.Information, "Removing route descriptor for '{destination}':'{inputPortKey}'", destination.Key ?? null, string.IsNullOrEmpty(inputPortKey) ? "auto" : inputPortKey);
 
-            var descr = string.IsNullOrEmpty(inputPortKey) 
+            var descr = string.IsNullOrEmpty(inputPortKey)
                 ? GetRouteDescriptorForDestination(destination)
                 : GetRouteDescriptorForDestinationAndInputPort(destination, inputPortKey);
             if (descr != null)
@@ -84,70 +114,4 @@ namespace PepperDash.Essentials.Core
             return descr;
         }
     }
-
-    /*/// <summary>
-    /// A collection of RouteDescriptors - typically the static DefaultCollection is used
-    /// </summary>
-    /// <summary>
-    /// Represents a RouteDescriptorCollection
-    /// </summary>
-    public class RouteDescriptorCollection<TInputSelector, TOutputSelector>
-	{
-		public static RouteDescriptorCollection<TInputSelector, TOutputSelector> DefaultCollection
-		{
-			get
-			{
-				if (_DefaultCollection == null)
-					_DefaultCollection = new RouteDescriptorCollection<TInputSelector, TOutputSelector>();
-				return _DefaultCollection;
-			}
-		}
-		private static RouteDescriptorCollection<TInputSelector, TOutputSelector> _DefaultCollection;
-
-		private readonly List<RouteDescriptor> RouteDescriptors = new List<RouteDescriptor>();
-
-		/// <summary>
-		/// Adds a RouteDescriptor to the list.  If an existing RouteDescriptor for the
-		/// destination exists already, it will not be added - in order to preserve
-		/// proper route releasing.
-		/// </summary>
-		/// <param name="descriptor"></param>
-  /// <summary>
-  /// AddRouteDescriptor method
-  /// </summary>
-		public void AddRouteDescriptor(RouteDescriptor descriptor)
-		{
-			if (RouteDescriptors.Any(t => t.Destination == descriptor.Destination))
-			{
-				Debug.LogMessage(LogEventLevel.Debug, descriptor.Destination, 
-					"Route to [{0}] already exists in global routes table", descriptor.Source.Key);
-				return;
-			}
-			RouteDescriptors.Add(descriptor);
-		}
-
-		/// <summary>
-		/// Gets the RouteDescriptor for a destination
-		/// </summary>
-		/// <returns>null if no RouteDescriptor for a destination exists</returns>
-  /// <summary>
-  /// GetRouteDescriptorForDestination method
-  /// </summary>
-		public RouteDescriptor GetRouteDescriptorForDestination(IRoutingInputs<TInputSelector> destination)
-		{
-			return RouteDescriptors.FirstOrDefault(rd => rd.Destination == destination);
-		}
-
-		/// <summary>
-		/// Returns the RouteDescriptor for a given destination AND removes it from collection.
-		/// Returns null if no route with the provided destination exists.
-		/// </summary>
-		public RouteDescriptor RemoveRouteDescriptor(IRoutingInputs<TInputSelector> destination)
-		{
-			var descr = GetRouteDescriptorForDestination(destination);
-			if (descr != null)
-				RouteDescriptors.Remove(descr);
-			return descr;
-		}
-	}*/
 }

src/PepperDash.Essentials.Core/Routing/RouteSwitchDescriptor.cs

@@ -4,96 +4,51 @@
     /// Represents a RouteSwitchDescriptor
     /// </summary>
     public class RouteSwitchDescriptor
-	{
-  /// <summary>
-  /// Gets or sets the SwitchingDevice
-  /// </summary>
-		public IRoutingInputs SwitchingDevice { get { return InputPort?.ParentDevice; } }
-		/// <summary>
-		/// The output port being switched from (relevant for matrix switchers). Null for sink devices.
-		/// </summary>
-		public RoutingOutputPort OutputPort { get; set; }
-		/// <summary>
-		/// The input port being switched to.
-		/// </summary>
-		public RoutingInputPort InputPort { get; set; }
-
-		/// <summary>
-		/// Initializes a new instance of the <see cref="RouteSwitchDescriptor"/> class for sink devices (no output port).
-		/// </summary>
-		/// <param name="inputPort">The input port being switched to.</param>
-		public RouteSwitchDescriptor(RoutingInputPort inputPort)
-		{
-			InputPort = inputPort;
-		}
-
-		/// <summary>
-		/// Initializes a new instance of the <see cref="RouteSwitchDescriptor"/> class for matrix switchers.
-		/// </summary>
-		/// <param name="outputPort">The output port being switched from.</param>
-		/// <param name="inputPort">The input port being switched to.</param>
-		public RouteSwitchDescriptor(RoutingOutputPort outputPort, RoutingInputPort inputPort)
-		{
-			InputPort = inputPort;
-			OutputPort = outputPort;
-		}
-
-		/// <summary>
-		/// Returns a string representation of the route switch descriptor.
-		/// </summary>
-		/// <returns>A string describing the switch operation.</returns>
-  /// <inheritdoc />
-		public override string ToString()
-		{
-            if (SwitchingDevice is IRouting)
-                return $"{(SwitchingDevice != null ? SwitchingDevice.Key : "No Device")} switches output {(OutputPort != null ? OutputPort.Key : "No output port")} to input {(InputPort != null ? InputPort.Key : "No input port")}";
-            else
-                return $"{(SwitchingDevice != null ? SwitchingDevice.Key : "No Device")} switches to input {(InputPort != null ? InputPort.Key : "No input port")}";
-		}
-	}
-
-    /*/// <summary>
-    /// Represents an individual link for a route
-    /// </summary>
-    /// <summary>
-    /// Represents a RouteSwitchDescriptor
-    /// </summary>
-    public class RouteSwitchDescriptor<TInputSelector, TOutputSelector>
     {
         /// <summary>
         /// Gets or sets the SwitchingDevice
         /// </summary>
-        public IRoutingInputs<TInputSelector> SwitchingDevice { get { return InputPort.ParentDevice; } }
+        public IRoutingInputs SwitchingDevice { get { return InputPort?.ParentDevice; } }
         /// <summary>
-        /// Gets or sets the OutputPort
+        /// The output port being switched from (relevant for matrix switchers). Null for sink devices.
         /// </summary>
-        public RoutingOutputPort<TOutputSelector> OutputPort { get; set; }
+        public RoutingOutputPort OutputPort { get; set; }
         /// <summary>
-        /// Gets or sets the InputPort
+        /// The input port being switched to.
         /// </summary>
-        public RoutingInputPort<TInputSelector> InputPort { get; set; }
+        public RoutingInputPort InputPort { get; set; }
 
-        public RouteSwitchDescriptor(RoutingInputPort<TInputSelector> inputPort)
+        /// <summary>
+        /// Initializes a new instance of the <see cref="RouteSwitchDescriptor"/> class for sink devices (no output port).
+        /// </summary>
+        /// <param name="inputPort">The input port being switched to.</param>
+        public RouteSwitchDescriptor(RoutingInputPort inputPort)
         {
             InputPort = inputPort;
         }
 
-        public RouteSwitchDescriptor(RoutingOutputPort<TOutputSelector> outputPort, RoutingInputPort<TInputSelector> inputPort)
+        /// <summary>
+        /// Initializes a new instance of the <see cref="RouteSwitchDescriptor"/> class for matrix switchers.
+        /// </summary>
+        /// <param name="outputPort">The output port being switched from.</param>
+        /// <param name="inputPort">The input port being switched to.</param>
+        public RouteSwitchDescriptor(RoutingOutputPort outputPort, RoutingInputPort inputPort)
         {
             InputPort = inputPort;
             OutputPort = outputPort;
         }
 
         /// <summary>
-        /// ToString method
+        /// Returns a string representation of the route switch descriptor.
         /// </summary>
+        /// <returns>A string describing the switch operation.</returns>
         /// <inheritdoc />
         public override string ToString()
         {
             if (SwitchingDevice is IRouting)
-                return string.Format("{0} switches output '{1}' to input '{2}'", SwitchingDevice.Key, OutputPort.Selector, InputPort.Selector);
+                return $"{(SwitchingDevice != null ? SwitchingDevice.Key : "No Device")} switches output {(OutputPort != null ? OutputPort.Key : "No output port")} to input {(InputPort != null ? InputPort.Key : "No input port")}";
             else
-                return string.Format("{0} switches to input '{1}'", SwitchingDevice.Key, InputPort.Selector);
+                return $"{(SwitchingDevice != null ? SwitchingDevice.Key : "No Device")} switches to input {(InputPort != null ? InputPort.Key : "No input port")}";
         }
-    }*/
+    }
 }

src/PepperDash.Essentials.Core/Routing/RoutingFeedbackManager.cs

@@ -1,7 +1,9 @@
-using PepperDash.Core;
-using PepperDash.Essentials.Core.Config;
-using System;
+using System;
+using System.Collections.Generic;
 using System.Linq;
+using Crestron.SimplSharp;
+using PepperDash.Core;
+using PepperDash.Essentials.Core.Config;
 
 namespace PepperDash.Essentials.Core.Routing
 {
@@ -9,19 +11,124 @@ namespace PepperDash.Essentials.Core.Routing
     /// Manages routing feedback by subscribing to route changes on midpoint and sink devices,
     /// tracing the route back to the original source, and updating the CurrentSourceInfo on sink devices.
     /// </summary>
-    public class RoutingFeedbackManager:EssentialsDevice
+    public class RoutingFeedbackManager : EssentialsDevice
     {
+        /// <summary>
+        /// Maps midpoint device keys to the set of sink device keys that are downstream
+        /// </summary>
+        private Dictionary<string, HashSet<string>> midpointToSinksMap;
+
+        /// <summary>
+        /// Debounce timers for each sink device to prevent rapid successive updates
+        /// </summary>
+        private readonly Dictionary<string, CTimer> updateTimers = new Dictionary<string, CTimer>();
+
+        /// <summary>
+        /// Debounce delay in milliseconds
+        /// </summary>
+        private const long DEBOUNCE_MS = 500;
+
         /// <summary>
         /// Initializes a new instance of the <see cref="RoutingFeedbackManager"/> class.
         /// </summary>
         /// <param name="key">The unique key for this manager device.</param>
         /// <param name="name">The name of this manager device.</param>
-        public RoutingFeedbackManager(string key, string name): base(key, name)
-        {            
+        public RoutingFeedbackManager(string key, string name)
+            : base(key, name)
+        {
+            AddPreActivationAction(BuildMidpointSinkMap);
             AddPreActivationAction(SubscribeForMidpointFeedback);
             AddPreActivationAction(SubscribeForSinkFeedback);
         }
 
+        /// <summary>
+        /// Builds a map of which sink devices are downstream of each midpoint device
+        /// for performance optimization in HandleMidpointUpdate
+        /// </summary>
+        private void BuildMidpointSinkMap()
+        {
+            midpointToSinksMap = new Dictionary<string, HashSet<string>>();
+
+            var sinks = DeviceManager.AllDevices.OfType<IRoutingSinkWithSwitchingWithInputPort>();
+            var midpoints = DeviceManager.AllDevices.OfType<IRoutingWithFeedback>();
+
+            foreach (var sink in sinks)
+            {
+                if (sink.CurrentInputPort == null)
+                    continue;
+
+                // Find all upstream midpoints for this sink
+                var upstreamMidpoints = GetUpstreamMidpoints(sink);
+
+                foreach (var midpointKey in upstreamMidpoints)
+                {
+                    if (!midpointToSinksMap.ContainsKey(midpointKey))
+                        midpointToSinksMap[midpointKey] = new HashSet<string>();
+
+                    midpointToSinksMap[midpointKey].Add(sink.Key);
+                }
+            }
+
+            Debug.LogMessage(
+                Serilog.Events.LogEventLevel.Information,
+                "Built midpoint-to-sink map with {count} midpoints",
+                this,
+                midpointToSinksMap.Count
+            );
+        }
+
+        /// <summary>
+        /// Gets all upstream midpoint device keys for a given sink
+        /// </summary>
+        private HashSet<string> GetUpstreamMidpoints(IRoutingSinkWithSwitchingWithInputPort sink)
+        {
+            var result = new HashSet<string>();
+            var visited = new HashSet<string>();
+
+            if (sink.CurrentInputPort == null)
+                return result;
+
+            var tieLine = TieLineCollection.Default.FirstOrDefault(tl =>
+                tl.DestinationPort.Key == sink.CurrentInputPort.Key &&
+                tl.DestinationPort.ParentDevice.Key == sink.CurrentInputPort.ParentDevice.Key);
+
+            if (tieLine == null)
+                return result;
+
+            TraceUpstreamMidpoints(tieLine, result, visited);
+            return result;
+        }
+
+        /// <summary>
+        /// Recursively traces upstream to find all midpoint devices
+        /// </summary>
+        private void TraceUpstreamMidpoints(TieLine tieLine, HashSet<string> midpoints, HashSet<string> visited)
+        {
+            if (tieLine == null || visited.Contains(tieLine.SourcePort.ParentDevice.Key))
+                return;
+
+            visited.Add(tieLine.SourcePort.ParentDevice.Key);
+
+            if (tieLine.SourcePort.ParentDevice is IRoutingWithFeedback midpoint)
+            {
+                midpoints.Add(midpoint.Key);
+
+                // Find upstream TieLines connected to this midpoint's inputs
+                var midpointInputs = (midpoint as IRoutingInputs)?.InputPorts;
+                if (midpointInputs != null)
+                {
+                    foreach (var inputPort in midpointInputs)
+                    {
+                        var upstreamTieLine = TieLineCollection.Default.FirstOrDefault(tl =>
+                            tl.DestinationPort.Key == inputPort.Key &&
+                            tl.DestinationPort.ParentDevice.Key == inputPort.ParentDevice.Key);
+
+                        if (upstreamTieLine != null)
+                            TraceUpstreamMidpoints(upstreamTieLine, midpoints, visited);
+                    }
+                }
+            }
+        }
 
         /// <summary>
         /// Subscribes to the RouteChanged event on all devices implementing <see cref="IRoutingWithFeedback"/>.
@@ -41,34 +148,66 @@ namespace PepperDash.Essentials.Core.Routing
         /// </summary>
         private void SubscribeForSinkFeedback()
         {
-                var sinkDevices = DeviceManager.AllDevices.OfType<IRoutingSinkWithSwitchingWithInputPort>();
+            var sinkDevices =
+                DeviceManager.AllDevices.OfType<IRoutingSinkWithSwitchingWithInputPort>();
 
-                foreach (var device in sinkDevices)
-                {
-                    device.InputChanged += HandleSinkUpdate;
-                }   
+            foreach (var device in sinkDevices)
+            {
+                device.InputChanged += HandleSinkUpdate;
+            }
         }
 
         /// <summary>
         /// Handles the RouteChanged event from a midpoint device.
-        /// Triggers an update for all sink devices.
+        /// Only triggers updates for sink devices that are downstream of this midpoint.
         /// </summary>
         /// <param name="midpoint">The midpoint device that reported a route change.</param>
         /// <param name="newRoute">The descriptor of the new route.</param>
-        private void HandleMidpointUpdate(IRoutingWithFeedback midpoint, RouteSwitchDescriptor newRoute)
+        private void HandleMidpointUpdate(
+            IRoutingWithFeedback midpoint,
+            RouteSwitchDescriptor newRoute
+        )
         {
             try
             {
-                var devices = DeviceManager.AllDevices.OfType<IRoutingSinkWithSwitchingWithInputPort>();
-
-                foreach (var device in devices)
+                // Only update affected sinks (performance optimization)
+                if (midpointToSinksMap != null && midpointToSinksMap.TryGetValue(midpoint.Key, out var affectedSinkKeys))
                 {
-                    UpdateDestination(device, device.CurrentInputPort);
+                    Debug.LogMessage(
+                        Serilog.Events.LogEventLevel.Debug,
+                        "Midpoint {midpoint} changed, updating {count} downstream sinks",
+                        this,
+                        midpoint.Key,
+                        affectedSinkKeys.Count
+                    );
+
+                    foreach (var sinkKey in affectedSinkKeys)
+                    {
+                        if (DeviceManager.GetDeviceForKey(sinkKey) is IRoutingSinkWithSwitchingWithInputPort sink)
+                        {
+                            UpdateDestination(sink, sink.CurrentInputPort);
+                        }
+                    }
+                }
+                else
+                {
+                    Debug.LogMessage(
+                        Serilog.Events.LogEventLevel.Debug,
+                        "Midpoint {midpoint} changed but has no downstream sinks in map",
+                        this,
+                        midpoint.Key
+                    );
                 }
             }
             catch (Exception ex)
             {
-                Debug.LogMessage(ex, "Error handling midpoint update from {midpointKey}:{Exception}", this, midpoint.Key, ex);
+                Debug.LogMessage(
+                    ex,
+                    "Error handling midpoint update from {midpointKey}:{Exception}",
+                    this,
+                    midpoint.Key,
+                    ex
+                );
             }
         }
 
@@ -78,7 +217,10 @@ namespace PepperDash.Essentials.Core.Routing
         /// </summary>
         /// <param name="sender">The sink device that reported an input change.</param>
         /// <param name="currentInputPort">The new input port selected on the sink device.</param>
-        private void HandleSinkUpdate(IRoutingSinkWithSwitching sender, RoutingInputPort currentInputPort)
+        private void HandleSinkUpdate(
+            IRoutingSinkWithSwitching sender,
+            RoutingInputPort currentInputPort
+        )
         {
             try
             {
@@ -86,23 +228,93 @@ namespace PepperDash.Essentials.Core.Routing
             }
             catch (Exception ex)
             {
-                Debug.LogMessage(ex, "Error handling Sink update from {senderKey}:{Exception}", this, sender.Key, ex);
+                Debug.LogMessage(
+                    ex,
+                    "Error handling Sink update from {senderKey}:{Exception}",
+                    this,
+                    sender.Key,
+                    ex
+                );
             }
         }
 
         /// <summary>
         /// Updates the CurrentSourceInfo and CurrentSourceInfoKey properties on a destination (sink) device
         /// based on its currently selected input port by tracing the route back through tie lines.
+        /// Uses debouncing to prevent rapid successive updates.
         /// </summary>
         /// <param name="destination">The destination sink device to update.</param>
         /// <param name="inputPort">The currently selected input port on the destination device.</param>
-        private void UpdateDestination(IRoutingSinkWithSwitching destination, RoutingInputPort inputPort)
-        {            
-            Debug.LogMessage(Serilog.Events.LogEventLevel.Verbose, "Updating destination {destination} with inputPort {inputPort}", this, destination?.Key, inputPort?.Key);
+        private void UpdateDestination(
+            IRoutingSinkWithSwitching destination,
+            RoutingInputPort inputPort
+        )
+        {
+            if (destination == null)
+                return;
 
-            if(inputPort == null)
+            var key = destination.Key;
+
+            // Cancel existing timer for this sink
+            if (updateTimers.TryGetValue(key, out var existingTimer))
             {
-                Debug.LogMessage(Serilog.Events.LogEventLevel.Warning, "Destination {destination} has not reported an input port yet", this,destination.Key);
+                existingTimer.Stop();
+                existingTimer.Dispose();
+            }
+
+            // Start new debounced timer
+            updateTimers[key] = new CTimer(_ =>
+            {
+                try
+                {
+                    UpdateDestinationImmediate(destination, inputPort);
+                }
+                catch (Exception ex)
+                {
+                    Debug.LogMessage(
+                        ex,
+                        "Error in debounced update for destination {destinationKey}: {message}",
+                        this,
+                        destination.Key,
+                        ex.Message
+                    );
+                }
+                finally
+                {
+                    if (updateTimers.ContainsKey(key))
+                    {
+                        updateTimers[key]?.Dispose();
+                        updateTimers.Remove(key);
+                    }
+                }
+            }, null, DEBOUNCE_MS);
+        }
+
+        /// <summary>
+        /// Immediately updates the CurrentSourceInfo for a destination device.
+        /// Called after debounce delay.
+        /// </summary>
+        private void UpdateDestinationImmediate(
+            IRoutingSinkWithSwitching destination,
+            RoutingInputPort inputPort
+        )
+        {
+            Debug.LogMessage(
+                Serilog.Events.LogEventLevel.Debug,
+                "Updating destination {destination} with inputPort {inputPort}",
+                this,
+                destination?.Key,
+                inputPort?.Key
+            );
+
+            if (inputPort == null)
+            {
+                Debug.LogMessage(
+                    Serilog.Events.LogEventLevel.Debug,
+                    "Destination {destination} has not reported an input port yet",
+                    this,
+                    destination.Key
+                );
                 return;
             }
 
@@ -111,11 +323,19 @@ namespace PepperDash.Essentials.Core.Routing
             {
                 var tieLines = TieLineCollection.Default;
 
-                firstTieLine = tieLines.FirstOrDefault(tl => tl.DestinationPort.Key == inputPort.Key && tl.DestinationPort.ParentDevice.Key == inputPort.ParentDevice.Key);
+                firstTieLine = tieLines.FirstOrDefault(tl =>
+                    tl.DestinationPort.Key == inputPort.Key
+                    && tl.DestinationPort.ParentDevice.Key == inputPort.ParentDevice.Key
+                );
 
                 if (firstTieLine == null)
                 {
-                    Debug.LogMessage(Serilog.Events.LogEventLevel.Information, "No tieline found for inputPort {inputPort}. Clearing current source", this, inputPort);
+                    Debug.LogMessage(
+                        Serilog.Events.LogEventLevel.Debug,
+                        "No tieline found for inputPort {inputPort}. Clearing current source",
+                        this,
+                        inputPort
+                    );
 
                     var tempSourceListItem = new SourceListItem
                     {
@@ -123,12 +343,13 @@ namespace PepperDash.Essentials.Core.Routing
                         Name = inputPort.Key,
                     };
 
-
-                    destination.CurrentSourceInfo = tempSourceListItem;                        ;
+                    destination.CurrentSourceInfo = tempSourceListItem;
+                    ;
                     destination.CurrentSourceInfoKey = "$transient";
                     return;
                 }
-            } catch (Exception ex)
+            }
+            catch (Exception ex)
             {
                 Debug.LogMessage(ex, "Error getting first tieline: {Exception}", this, ex);
                 return;
@@ -143,7 +364,12 @@ namespace PepperDash.Essentials.Core.Routing
 
                 if (sourceTieLine == null)
                 {
-                    Debug.LogMessage(Serilog.Events.LogEventLevel.Information, "No route found to source for inputPort {inputPort}. Clearing current source", this, inputPort);
+                    Debug.LogMessage(
+                        Serilog.Events.LogEventLevel.Debug,
+                        "No route found to source for inputPort {inputPort}. Clearing current source",
+                        this,
+                        inputPort
+                    );
 
                     var tempSourceListItem = new SourceListItem
                     {
@@ -155,32 +381,45 @@ namespace PepperDash.Essentials.Core.Routing
                     destination.CurrentSourceInfoKey = string.Empty;
                     return;
                 }
-            } catch(Exception ex)
+            }
+            catch (Exception ex)
             {
                 Debug.LogMessage(ex, "Error getting sourceTieLine: {Exception}", this, ex);
                 return;
             }
 
-            // Debug.LogMessage(Serilog.Events.LogEventLevel.Verbose, "Found root TieLine {tieLine}", this, sourceTieLine);           
+            // Debug.LogMessage(Serilog.Events.LogEventLevel.Verbose, "Found root TieLine {tieLine}", this, sourceTieLine);
 
             // Does not handle combinable scenarios or other scenarios where a display might be part of multiple rooms yet.
-            var room = DeviceManager.AllDevices.OfType<IEssentialsRoom>().FirstOrDefault((r) => {
-                if(r is IHasMultipleDisplays roomMultipleDisplays)
-                {
-                    return roomMultipleDisplays.Displays.Any(d => d.Value.Key == destination.Key);
-                }
+            var room = DeviceManager
+                .AllDevices.OfType<IEssentialsRoom>()
+                .FirstOrDefault(
+                    (r) =>
+                    {
+                        if (r is IHasMultipleDisplays roomMultipleDisplays)
+                        {
+                            return roomMultipleDisplays.Displays.Any(d =>
+                                d.Value.Key == destination.Key
+                            );
+                        }
 
-                if(r is IHasDefaultDisplay roomDefaultDisplay)
-                {
-                    return roomDefaultDisplay.DefaultDisplay.Key == destination.Key;
-                }
+                        if (r is IHasDefaultDisplay roomDefaultDisplay)
+                        {
+                            return roomDefaultDisplay.DefaultDisplay.Key == destination.Key;
+                        }
 
-                return false;
-            });
-            
-            if(room == null)
+                        return false;
+                    }
+                );
+
+            if (room == null)
             {
-                Debug.LogMessage(Serilog.Events.LogEventLevel.Warning, "No room found for display {destination}", this, destination.Key);
+                Debug.LogMessage(
+                    Serilog.Events.LogEventLevel.Debug,
+                    "No room found for display {destination}",
+                    this,
+                    destination.Key
+                );
                 return;
             }
 
@@ -190,29 +429,45 @@ namespace PepperDash.Essentials.Core.Routing
 
             if (sourceList == null)
             {
-                Debug.LogMessage(Serilog.Events.LogEventLevel.Warning, "No source list found for source list key {key}. Unable to find source for tieLine {sourceTieLine}", this, room.SourceListKey, sourceTieLine);
+                Debug.LogMessage(
+                    Serilog.Events.LogEventLevel.Debug,
+                    "No source list found for source list key {key}. Unable to find source for tieLine {sourceTieLine}",
+                    this,
+                    room.SourceListKey,
+                    sourceTieLine
+                );
                 return;
             }
 
             // Debug.LogMessage(Serilog.Events.LogEventLevel.Verbose, "Found sourceList for room {room}", this, room.Key);
 
-            var sourceListItem = sourceList.FirstOrDefault(sli => {
-                 //// Debug.LogMessage(Serilog.Events.LogEventLevel.Verbose,
-                 //   "SourceListItem {sourceListItem}:{sourceKey} tieLine sourceport device key {sourcePortDeviceKey}",
-                 //   this,
-                 //   sli.Key,
-                 //   sli.Value.SourceKey,
-                 //   sourceTieLine.SourcePort.ParentDevice.Key);
+            var sourceListItem = sourceList.FirstOrDefault(sli =>
+            {
+                //// Debug.LogMessage(Serilog.Events.LogEventLevel.Verbose,
+                //   "SourceListItem {sourceListItem}:{sourceKey} tieLine sourceport device key {sourcePortDeviceKey}",
+                //   this,
+                //   sli.Key,
+                //   sli.Value.SourceKey,
+                //   sourceTieLine.SourcePort.ParentDevice.Key);
 
-                return sli.Value.SourceKey.Equals(sourceTieLine.SourcePort.ParentDevice.Key,StringComparison.InvariantCultureIgnoreCase);
-            });            
+                return sli.Value.SourceKey.Equals(
+                    sourceTieLine.SourcePort.ParentDevice.Key,
+                    StringComparison.InvariantCultureIgnoreCase
+                );
+            });
 
             var source = sourceListItem.Value;
             var sourceKey = sourceListItem.Key;
 
             if (source == null)
             {
-                Debug.LogMessage(Serilog.Events.LogEventLevel.Information, "No source found for device {key}. Creating transient source for {destination}", this, sourceTieLine.SourcePort.ParentDevice.Key, destination);
+                Debug.LogMessage(
+                    Serilog.Events.LogEventLevel.Debug,
+                    "No source found for device {key}. Creating transient source for {destination}",
+                    this,
+                    sourceTieLine.SourcePort.ParentDevice.Key,
+                    destination
+                );
 
                 var tempSourceListItem = new SourceListItem
                 {
@@ -221,7 +476,7 @@ namespace PepperDash.Essentials.Core.Routing
                 };
 
                 destination.CurrentSourceInfoKey = "$transient";
-                destination.CurrentSourceInfo = tempSourceListItem;                
+                destination.CurrentSourceInfo = tempSourceListItem;
                 return;
             }
 
@@ -229,82 +484,101 @@ namespace PepperDash.Essentials.Core.Routing
 
             destination.CurrentSourceInfoKey = sourceKey;
             destination.CurrentSourceInfo = source;
-            
         }
 
         /// <summary>
-        /// Recursively traces a route back from a given tie line to find the root source tie line.
-        /// It navigates through midpoint devices (<see cref="IRoutingWithFeedback"/>) by checking their current routes.
+        /// Traces a route back from a given tie line to find the root source tie line.
+        /// Leverages the existing Extensions.GetRouteToSource method with loop protection.
         /// </summary>
         /// <param name="tieLine">The starting tie line (typically connected to a sink or midpoint).</param>
         /// <returns>The <see cref="TieLine"/> connected to the original source device, or null if the source cannot be determined.</returns>
         private TieLine GetRootTieLine(TieLine tieLine)
         {
-            TieLine nextTieLine = null;
             try
             {
-                //Debug.LogMessage(Serilog.Events.LogEventLevel.Verbose, "**Following tieLine {tieLine}**", this, tieLine);
-
-                if (tieLine.SourcePort.ParentDevice is IRoutingWithFeedback midpoint)
+                if (!(tieLine.DestinationPort.ParentDevice is IRoutingInputs sink))
                 {
-                    // Debug.LogMessage(Serilog.Events.LogEventLevel.Verbose, "TieLine Source device {sourceDevice} is midpoint", this, midpoint);
-
-                    if(midpoint.CurrentRoutes == null || midpoint.CurrentRoutes.Count == 0)
-                    {
-                        Debug.LogMessage(Serilog.Events.LogEventLevel.Information, "Midpoint {midpointKey} has no routes",this, midpoint.Key);
-                        return null;
-                    }
-
-                    var currentRoute = midpoint.CurrentRoutes.FirstOrDefault(route => {
-                        //Debug.LogMessage(Serilog.Events.LogEventLevel.Verbose, "Checking {route} against {tieLine}", this, route, tieLine);
-
-                        return route.OutputPort != null && route.InputPort != null && route.OutputPort?.Key == tieLine.SourcePort.Key && route.OutputPort?.ParentDevice.Key == tieLine.SourcePort.ParentDevice.Key;
-                    });
-
-                    if (currentRoute == null)
-                    {
-                        Debug.LogMessage(Serilog.Events.LogEventLevel.Information, "No route through midpoint {midpoint} for outputPort {outputPort}", this, midpoint.Key, tieLine.SourcePort);
-                        return null;
-                    }
-
-                    //Debug.LogMessage(Serilog.Events.LogEventLevel.Verbose, "Found currentRoute {currentRoute} through {midpoint}", this, currentRoute, midpoint);
-
-                    nextTieLine = TieLineCollection.Default.FirstOrDefault(tl => { 
-                        //Debug.LogMessage(Serilog.Events.LogEventLevel.Verbose, "Checking {route} against {tieLine}", tl.DestinationPort.Key, currentRoute.InputPort.Key);
-                        return tl.DestinationPort.Key == currentRoute.InputPort.Key && tl.DestinationPort.ParentDevice.Key == currentRoute.InputPort.ParentDevice.Key; });
-
-                    if (nextTieLine != null)
-                    {
-                        //Debug.LogMessage(Serilog.Events.LogEventLevel.Verbose, "Found next tieLine {tieLine}. Walking the chain", this, nextTieLine);
-                        return GetRootTieLine(nextTieLine);
-                    }
-
-                    //Debug.LogMessage(Serilog.Events.LogEventLevel.Verbose, "Found root tieLine {tieLine}", this,nextTieLine);
-                    return nextTieLine;
+                    Debug.LogMessage(
+                        Serilog.Events.LogEventLevel.Debug,
+                        "TieLine destination {device} is not IRoutingInputs",
+                        this,
+                        tieLine.DestinationPort.ParentDevice.Key
+                    );
+                    return null;
                 }
 
-                //Debug.LogMessage(Serilog.Events.LogEventLevel.Verbose, "TieLIne Source Device {sourceDeviceKey} is IRoutingSource: {isIRoutingSource}", this, tieLine.SourcePort.ParentDevice.Key, tieLine.SourcePort.ParentDevice is IRoutingSource);
-                //Debug.LogMessage(Serilog.Events.LogEventLevel.Verbose, "TieLine Source Device interfaces: {typeFullName}:{interfaces}", this, tieLine.SourcePort.ParentDevice.GetType().FullName, tieLine.SourcePort.ParentDevice.GetType().GetInterfaces().Select(i => i.Name));
+                // Get all potential sources (devices that only have outputs, not inputs+outputs)
+                var sources = DeviceManager.AllDevices
+                            .OfType<IRoutingOutputs>()
+                            .Where(s => !(s is IRoutingInputsOutputs));
 
-                if (tieLine.SourcePort.ParentDevice is IRoutingSource || tieLine.SourcePort.ParentDevice is IRoutingOutputs) //end of the chain
+                // Try each signal type that this TieLine supports
+                var signalTypes = new[]
                 {
-                    // Debug.LogMessage(Serilog.Events.LogEventLevel.Verbose, "Found root: {tieLine}", this, tieLine);
-                    return tieLine;
+                    eRoutingSignalType.Audio,
+                    eRoutingSignalType.Video,
+                    eRoutingSignalType.AudioVideo,
+                    eRoutingSignalType.SecondaryAudio,
+                    eRoutingSignalType.UsbInput,
+                    eRoutingSignalType.UsbOutput
+                };
+
+                foreach (var signalType in signalTypes)
+                {
+                    if (!tieLine.Type.HasFlag(signalType))
+                        continue;
+
+                    foreach (var source in sources)
+                    {
+                        // Use the optimized route discovery with loop protection
+                        var (route, _) = sink.GetRouteToSource(
+                            source,
+                            signalType,
+                            tieLine.DestinationPort,
+                            null
+                        );
+
+                        if (route != null && route.Routes != null && route.Routes.Count > 0)
+                        {
+                            // Found a valid route - return the source TieLine
+                            var sourceTieLine = TieLineCollection.Default.FirstOrDefault(tl =>
+                                tl.SourcePort.ParentDevice.Key == source.Key &&
+                                tl.Type.HasFlag(signalType));
+
+                            if (sourceTieLine != null)
+                            {
+                                Debug.LogMessage(
+                                    Serilog.Events.LogEventLevel.Debug,
+                                    "Found route from {source} to {sink} with {count} hops",
+                                    this,
+                                    source.Key,
+                                    sink.Key,
+                                    route.Routes.Count
+                                );
+                                return sourceTieLine;
+                            }
+                        }
+                    }
                 }
 
-                nextTieLine = TieLineCollection.Default.FirstOrDefault(tl => tl.DestinationPort.Key == tieLine.SourcePort.Key && tl.DestinationPort.ParentDevice.Key == tieLine.SourcePort.ParentDevice.Key );
-
-                if (nextTieLine != null)
-                {
-                    return GetRootTieLine(nextTieLine);
-                }
-            } catch (Exception ex)
-            {
-                Debug.LogMessage(ex, "Error walking tieLines: {Exception}", this, ex);
+                Debug.LogMessage(
+                    Serilog.Events.LogEventLevel.Debug,
+                    "No route found to any source from {sink}",
+                    this,
+                    sink.Key
+                );
+                return null;
+            }
+            catch (Exception ex)
+            {
+                Debug.LogMessage(
+                    ex,
+                    "Error getting root tieLine: {Exception}",
+                    this,
+                    ex
+                );
                 return null;
             }
-
-            return null;
         }
     }
 }

src/PepperDash.Essentials.Core/Web/EssentialsWebApi.cs

@@ -10,71 +10,71 @@ using Serilog.Events;
 
 namespace PepperDash.Essentials.Core.Web
 {
- /// <summary>
- /// Represents a EssentialsWebApi
- /// </summary>
-	public class EssentialsWebApi : EssentialsDevice
-	{
-		private readonly WebApiServer _server;        
+    /// <summary>
+    /// Represents a EssentialsWebApi
+    /// </summary>
+    public class EssentialsWebApi : EssentialsDevice
+    {
+        private readonly WebApiServer _server;
 
-		///<example>
-		/// http(s)://{ipaddress}/cws/{basePath}
-		/// http(s)://{ipaddress}/VirtualControl/Rooms/{roomId}/cws/{basePath}
-		/// </example>
-		private readonly string _defaultBasePath = CrestronEnvironment.DevicePlatform == eDevicePlatform.Appliance 
-			? string.Format("/app{0:00}/api", InitialParametersClass.ApplicationNumber) 
-			: "/api";
+        ///<example>
+        /// http(s)://{ipaddress}/cws/{basePath}
+        /// http(s)://{ipaddress}/VirtualControl/Rooms/{roomId}/cws/{basePath}
+        /// </example>
+        private readonly string _defaultBasePath = CrestronEnvironment.DevicePlatform == eDevicePlatform.Appliance
+            ? string.Format("/app{0:00}/api", InitialParametersClass.ApplicationNumber)
+            : "/api";
 
-		private const int DebugTrace = 0;
-		private const int DebugInfo = 1;
-		private const int DebugVerbose = 2;
+        private const int DebugTrace = 0;
+        private const int DebugInfo = 1;
+        private const int DebugVerbose = 2;
 
-  /// <summary>
-  /// Gets or sets the BasePath
-  /// </summary>
-		public string BasePath { get; private set; }
+        /// <summary>
+        /// Gets or sets the BasePath
+        /// </summary>
+        public string BasePath { get; private set; }
 
-		/// <summary>
-		/// Tracks if CWS is registered
-		/// </summary>
-		public bool IsRegistered
-		{
-			get { return _server.IsRegistered; }
-		}
+        /// <summary>
+        /// Tracks if CWS is registered
+        /// </summary>
+        public bool IsRegistered
+        {
+            get { return _server.IsRegistered; }
+        }
 
-		/// <summary>
-		/// Constructor
-		/// </summary>
-		/// <param name="key"></param>
-		/// <param name="name"></param>		
-		public EssentialsWebApi(string key, string name)
-			: this(key, name, null)
-		{
-		}
+        /// <summary>
+        /// Constructor
+        /// </summary>
+        /// <param name="key"></param>
+        /// <param name="name"></param>		
+        public EssentialsWebApi(string key, string name)
+            : this(key, name, null)
+        {
+        }
 
-		/// <summary>
-		/// Constructor
-		/// </summary>
-		/// <param name="key"></param>
-		/// <param name="name"></param>
-		/// <param name="config"></param>
-		public EssentialsWebApi(string key, string name, EssentialsWebApiPropertiesConfig config)
-			: base(key, name)
-		{
-			Key = key;
+        /// <summary>
+        /// Constructor
+        /// </summary>
+        /// <param name="key"></param>
+        /// <param name="name"></param>
+        /// <param name="config"></param>
+        public EssentialsWebApi(string key, string name, EssentialsWebApiPropertiesConfig config)
+            : base(key, name)
+        {
+            Key = key;
 
-			if (config == null)
-				BasePath = _defaultBasePath;
-			else
-				BasePath = string.IsNullOrEmpty(config.BasePath) ? _defaultBasePath : config.BasePath;
+            if (config == null)
+                BasePath = _defaultBasePath;
+            else
+                BasePath = string.IsNullOrEmpty(config.BasePath) ? _defaultBasePath : config.BasePath;
 
-			_server = new WebApiServer(Key, Name, BasePath);
+            _server = new WebApiServer(Key, Name, BasePath);
 
-			SetupRoutes();
-		}
+            SetupRoutes();
+        }
 
-		private void SetupRoutes()
-		{
+        private void SetupRoutes()
+        {
             var routes = new List<HttpCwsRoute>
             {
                 new HttpCwsRoute("versions")
@@ -177,6 +177,11 @@ namespace PepperDash.Essentials.Core.Web
                     Name = "Get Routing Ports for a device",
                     RouteHandler = new GetRoutingPortsHandler()
                 },
+                new HttpCwsRoute("routingDevicesAndTieLines")
+                {
+                    Name = "Get Routing Devices and TieLines",
+                    RouteHandler = new GetRoutingDevicesAndTieLinesHandler()
+                },
             };
 
             AddRoute(routes);
@@ -211,78 +216,79 @@ namespace PepperDash.Essentials.Core.Web
         /// </summary>
         /// <inheritdoc />
         public override void Initialize()
-		{
-            AddRoute(new HttpCwsRoute("apiPaths") {
+        {
+            AddRoute(new HttpCwsRoute("apiPaths")
+            {
                 Name = "GetPaths",
                 RouteHandler = new GetRoutesHandler(_server.GetRouteCollection(), BasePath)
             });
 
             // If running on an appliance
             if (CrestronEnvironment.DevicePlatform == eDevicePlatform.Appliance)
-			{
-				/*
+            {
+                /*
 					WEBSERVER [ON | OFF | TIMEOUT <VALUE IN SECONDS> | MAXSESSIONSPERUSER <Number of sessions>]
 				*/
-				var response = string.Empty;
-				CrestronConsole.SendControlSystemCommand("webserver", ref response);
-				if (response.Contains("OFF")) return;
+                var response = string.Empty;
+                CrestronConsole.SendControlSystemCommand("webserver", ref response);
+                if (response.Contains("OFF")) return;
 
-				var is4Series = eCrestronSeries.Series4 == (Global.ProcessorSeries & eCrestronSeries.Series4);
-				Debug.LogMessage(LogEventLevel.Verbose, "Starting Essentials Web API on {0} Appliance", is4Series ? "4-series" : "3-series");
+                var is4Series = eCrestronSeries.Series4 == (Global.ProcessorSeries & eCrestronSeries.Series4);
+                Debug.LogMessage(LogEventLevel.Verbose, "Starting Essentials Web API on {0} Appliance", is4Series ? "4-series" : "3-series");
 
-				_server.Start();
+                _server.Start();
 
-				GetPaths();
+                GetPaths();
 
-				return;
-			}
+                return;
+            }
 
-			// Automatically start CWS when running on a server (Linux OS, Virtual Control)
-			Debug.LogMessage(LogEventLevel.Verbose, "Starting Essentials Web API on Virtual Control Server");
+            // Automatically start CWS when running on a server (Linux OS, Virtual Control)
+            Debug.LogMessage(LogEventLevel.Verbose, "Starting Essentials Web API on Virtual Control Server");
 
-			_server.Start();
+            _server.Start();
 
-			GetPaths();
-		}
+            GetPaths();
+        }
 
-		/// <summary>
-		/// Print the available pahts
-		/// </summary>
-		/// <example>
-		/// http(s)://{ipaddress}/cws/{basePath}
-		/// http(s)://{ipaddress}/VirtualControl/Rooms/{roomId}/cws/{basePath}
-		/// </example>
-  /// <summary>
-  /// GetPaths method
-  /// </summary>
-		public void GetPaths()
-		{
-			Debug.LogMessage(LogEventLevel.Information, this, new string('-', 50));
+        /// <summary>
+        /// Print the available pahts
+        /// </summary>
+        /// <example>
+        /// http(s)://{ipaddress}/cws/{basePath}
+        /// http(s)://{ipaddress}/VirtualControl/Rooms/{roomId}/cws/{basePath}
+        /// </example>
+        /// <summary>
+        /// GetPaths method
+        /// </summary>
+        public void GetPaths()
+        {
+            Debug.LogMessage(LogEventLevel.Information, this, new string('-', 50));
 
-			var currentIp = CrestronEthernetHelper.GetEthernetParameter(
-				CrestronEthernetHelper.ETHERNET_PARAMETER_TO_GET.GET_CURRENT_IP_ADDRESS, 0);
-			
-			var hostname = CrestronEthernetHelper.GetEthernetParameter(
+            var currentIp = CrestronEthernetHelper.GetEthernetParameter(
+                CrestronEthernetHelper.ETHERNET_PARAMETER_TO_GET.GET_CURRENT_IP_ADDRESS, 0);
+
+            var hostname = CrestronEthernetHelper.GetEthernetParameter(
                     CrestronEthernetHelper.ETHERNET_PARAMETER_TO_GET.GET_HOSTNAME, 0);
 
             var path = CrestronEnvironment.DevicePlatform == eDevicePlatform.Server
                 ? $"https://{hostname}/VirtualControl/Rooms/{InitialParametersClass.RoomId}/cws{BasePath}"
                 : $"https://{currentIp}/cws{BasePath}";
-			
-			Debug.LogMessage(LogEventLevel.Information, this, "Server:{path:l}", path);
 
-			var routeCollection = _server.GetRouteCollection();
-			if (routeCollection == null)
-			{
-				Debug.LogMessage(LogEventLevel.Information, this, "Server route collection is null");
-				return;
-			}
-			Debug.LogMessage(LogEventLevel.Information, this, "Configured Routes:");
-			foreach (var route in routeCollection)
-			{
-				Debug.LogMessage(LogEventLevel.Information, this, "{routeName:l}: {routePath:l}/{routeUrl:l}", route.Name, path, route.Url);
-			}
-			Debug.LogMessage(LogEventLevel.Information, this, new string('-', 50));
-		}
-	}
+            Debug.LogMessage(LogEventLevel.Information, this, "Server:{path:l}", path);
+
+            var routeCollection = _server.GetRouteCollection();
+            if (routeCollection == null)
+            {
+                Debug.LogMessage(LogEventLevel.Information, this, "Server route collection is null");
+                return;
+            }
+            Debug.LogMessage(LogEventLevel.Information, this, "Configured Routes:");
+            foreach (var route in routeCollection)
+            {
+                Debug.LogMessage(LogEventLevel.Information, this, "{routeName:l}: {routePath:l}/{routeUrl:l}", route.Name, path, route.Url);
+            }
+            Debug.LogMessage(LogEventLevel.Information, this, new string('-', 50));
+        }
+    }
 }

src/PepperDash.Essentials.Core/Web/RequestHandlers/GetRoutingDevicesAndTieLinesHandler.cs

@@ -0,0 +1,178 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Crestron.SimplSharp.WebScripting;
+using Newtonsoft.Json;
+using PepperDash.Core;
+using PepperDash.Core.Web.RequestHandlers;
+
+namespace PepperDash.Essentials.Core.Web.RequestHandlers
+{
+  /// <summary>
+  /// Handles HTTP requests to retrieve routing devices and tielines information
+  /// </summary>
+  public class GetRoutingDevicesAndTieLinesHandler : WebApiBaseRequestHandler
+  {
+    public GetRoutingDevicesAndTieLinesHandler() : base(true) { }
+
+    protected override void HandleGet(HttpCwsContext context)
+    {
+      var devices = new List<RoutingDeviceInfo>();
+
+      // Get all devices from DeviceManager
+      foreach (var device in DeviceManager.AllDevices)
+      {
+        var deviceInfo = new RoutingDeviceInfo
+        {
+          Key = device.Key,
+          Name = (device as IKeyName)?.Name ?? device.Key
+        };
+
+        // Check if device implements IRoutingInputs
+        if (device is IRoutingInputs inputDevice)
+        {
+          deviceInfo.HasInputs = true;
+          deviceInfo.InputPorts = inputDevice.InputPorts.Select(p => new PortInfo
+          {
+            Key = p.Key,
+            SignalType = p.Type.ToString(),
+            ConnectionType = p.ConnectionType.ToString(),
+            IsInternal = p.IsInternal
+          }).ToList();
+        }
+
+        // Check if device implements IRoutingOutputs
+        if (device is IRoutingOutputs outputDevice)
+        {
+          deviceInfo.HasOutputs = true;
+          deviceInfo.OutputPorts = outputDevice.OutputPorts.Select(p => new PortInfo
+          {
+            Key = p.Key,
+            SignalType = p.Type.ToString(),
+            ConnectionType = p.ConnectionType.ToString(),
+            IsInternal = p.IsInternal
+          }).ToList();
+        }
+
+        // Check if device implements IRoutingInputsOutputs
+        if (device is IRoutingInputsOutputs)
+        {
+          deviceInfo.HasInputsAndOutputs = true;
+        }
+
+        // Only include devices that have routing capabilities
+        if (deviceInfo.HasInputs || deviceInfo.HasOutputs)
+        {
+          devices.Add(deviceInfo);
+        }
+      }
+
+      // Get all tielines
+      var tielines = TieLineCollection.Default.Select(tl => new TieLineInfo
+      {
+        SourceDeviceKey = tl.SourcePort.ParentDevice.Key,
+        SourcePortKey = tl.SourcePort.Key,
+        DestinationDeviceKey = tl.DestinationPort.ParentDevice.Key,
+        DestinationPortKey = tl.DestinationPort.Key,
+        SignalType = tl.Type.ToString(),
+        IsInternal = tl.IsInternal
+      }).ToList();
+
+      var response = new RoutingSystemInfo
+      {
+        Devices = devices,
+        TieLines = tielines
+      };
+
+      var jsonResponse = JsonConvert.SerializeObject(response, Formatting.Indented);
+
+      context.Response.StatusCode = 200;
+      context.Response.StatusDescription = "OK";
+      context.Response.ContentType = "application/json";
+      context.Response.ContentEncoding = Encoding.UTF8;
+      context.Response.Write(jsonResponse, false);
+      context.Response.End();
+    }
+  }
+
+  /// <summary>
+  /// Represents the complete routing system information including devices and tielines
+  /// </summary>
+  public class RoutingSystemInfo
+  {
+    [JsonProperty("devices")]
+    public List<RoutingDeviceInfo> Devices { get; set; }
+
+    [JsonProperty("tieLines")]
+    public List<TieLineInfo> TieLines { get; set; }
+  }
+
+  /// <summary>
+  /// Represents a routing device with its ports information
+  /// </summary>
+  public class RoutingDeviceInfo
+  {
+    [JsonProperty("key")]
+    public string Key { get; set; }
+
+    [JsonProperty("name")]
+    public string Name { get; set; }
+
+    [JsonProperty("hasInputs")]
+    public bool HasInputs { get; set; }
+
+    [JsonProperty("hasOutputs")]
+    public bool HasOutputs { get; set; }
+
+    [JsonProperty("hasInputsAndOutputs")]
+    public bool HasInputsAndOutputs { get; set; }
+
+    [JsonProperty("inputPorts", NullValueHandling = NullValueHandling.Ignore)]
+    public List<PortInfo> InputPorts { get; set; }
+
+    [JsonProperty("outputPorts", NullValueHandling = NullValueHandling.Ignore)]
+    public List<PortInfo> OutputPorts { get; set; }
+  }
+
+  /// <summary>
+  /// Represents a routing port with its properties
+  /// </summary>
+  public class PortInfo
+  {
+    [JsonProperty("key")]
+    public string Key { get; set; }
+
+    [JsonProperty("signalType")]
+    public string SignalType { get; set; }
+
+    [JsonProperty("connectionType")]
+    public string ConnectionType { get; set; }
+
+    [JsonProperty("isInternal")]
+    public bool IsInternal { get; set; }
+  }
+
+  /// <summary>
+  /// Represents a tieline connection between two ports
+  /// </summary>
+  public class TieLineInfo
+  {
+    [JsonProperty("sourceDeviceKey")]
+    public string SourceDeviceKey { get; set; }
+
+    [JsonProperty("sourcePortKey")]
+    public string SourcePortKey { get; set; }
+
+    [JsonProperty("destinationDeviceKey")]
+    public string DestinationDeviceKey { get; set; }
+
+    [JsonProperty("destinationPortKey")]
+    public string DestinationPortKey { get; set; }
+
+    [JsonProperty("signalType")]
+    public string SignalType { get; set; }
+
+    [JsonProperty("isInternal")]
+    public bool IsInternal { get; set; }
+  }
+}

src/PepperDash.Essentials.Devices.Common/DSP/DspBase.cs

@@ -61,13 +61,18 @@ namespace PepperDash.Essentials.Devices.Common.DSP
     /// <summary>
     /// Base class for DSP control points
     /// </summary>
-    public abstract class DspControlPoint : IKeyed
+    public abstract class DspControlPoint : IKeyName
     {
         /// <summary>
         /// Gets or sets the Key
         /// </summary>
         public string Key { get; }
 
+        /// <summary>
+        /// Gets or sets the Name
+        /// </summary>
+        public string Name { get; private set; }
+
         /// <summary>
         /// Initializes a new instance of the DspControlPoint class
         /// </summary>

src/PepperDash.Essentials.MobileControl.Messengers/Messengers/DeviceVolumeMessenger.cs

@@ -22,7 +22,7 @@ namespace PepperDash.Essentials.AppServer.Messengers
         /// <param name="messagePath">The message path.</param>
         /// <param name="device">The device.</param>
         public DeviceVolumeMessenger(string key, string messagePath, IBasicVolumeControls device)
-            : base(key, messagePath, device as IKeyName)
+            : base(key, messagePath, device)
         {
             this.device = device;
         }

src/PepperDash.Essentials.MobileControl.Messengers/Messengers/IMatrixRoutingMessenger.cs

@@ -62,6 +62,14 @@ namespace PepperDash.Essentials.AppServer.Messengers
                         inputs = matrixDevice.InputSlots.ToDictionary(kvp => kvp.Key, kvp => new RoutingInput(kvp.Value))
                     }));
                 };
+
+                inputSlot.IsOnline.OutputChange += (sender, args) =>
+                {
+                    PostStatusMessage(JToken.FromObject(new
+                    {
+                        inputs = matrixDevice.InputSlots.ToDictionary(kvp => kvp.Key, kvp => new RoutingInput(kvp.Value))
+                    }));
+                };
             }
         }
 

src/PepperDash.Essentials/ControlSystem.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.IO.Compression;
 using System.Linq;
 using System.Reflection;
@@ -92,12 +93,16 @@ namespace PepperDash.Essentials
 
             CrestronConsole.AddNewConsoleCommand(s => Debug.LogMessage(LogEventLevel.Information, "CONSOLE MESSAGE: {0}", s), "appdebugmessage", "Writes message to log", ConsoleAccessLevelEnum.AccessOperator);
 
-            CrestronConsole.AddNewConsoleCommand(s =>
-            {
-                foreach (var tl in TieLineCollection.Default)
-                    CrestronConsole.ConsoleCommandResponse("  {0}{1}", tl, CrestronEnvironment.NewLine);
-            },
-            "listtielines", "Prints out all tie lines", ConsoleAccessLevelEnum.AccessOperator);
+            CrestronConsole.AddNewConsoleCommand(ListTieLines,
+            "listtielines", "Prints out all tie lines. Usage: listtielines [signaltype]", ConsoleAccessLevelEnum.AccessOperator);
+
+            CrestronConsole.AddNewConsoleCommand(VisualizeRoutes, "visualizeroutes",
+                "Visualizes routes by signal type",
+                ConsoleAccessLevelEnum.AccessOperator);
+
+            CrestronConsole.AddNewConsoleCommand(VisualizeCurrentRoutes, "visualizecurrentroutes",
+                "Visualizes current active routes from DefaultCollection",
+                ConsoleAccessLevelEnum.AccessOperator);
 
             CrestronConsole.AddNewConsoleCommand(s =>
             {
@@ -443,6 +448,282 @@ namespace PepperDash.Essentials
 
             Debug.LogMessage(LogEventLevel.Information, "All Tie Lines Loaded.");
 
+            Extensions.MapDestinationsToSources();
+
+            Debug.LogMessage(LogEventLevel.Information, "All Routes Mapped.");
+        }
+
+
+
+        /// <summary>
+        /// Visualizes routes in a tree format for better understanding of signal paths
+        /// </summary>
+        private void ListTieLines(string args)
+        {
+            try
+            {
+                if (args.Contains("?"))
+                {
+                    CrestronConsole.ConsoleCommandResponse("Usage: listtielines [signaltype]\r\n");
+                    CrestronConsole.ConsoleCommandResponse("Signal types: Audio, Video, SecondaryAudio, AudioVideo, UsbInput, UsbOutput\r\n");
+                    return;
+                }
+
+                eRoutingSignalType? signalTypeFilter = null;
+                if (!string.IsNullOrEmpty(args))
+                {
+                    eRoutingSignalType parsedType;
+                    if (Enum.TryParse(args.Trim(), true, out parsedType))
+                    {
+                        signalTypeFilter = parsedType;
+                    }
+                    else
+                    {
+                        CrestronConsole.ConsoleCommandResponse("Invalid signal type: {0}\r\n", args.Trim());
+                        CrestronConsole.ConsoleCommandResponse("Valid types: Audio, Video, SecondaryAudio, AudioVideo, UsbInput, UsbOutput\r\n");
+                        return;
+                    }
+                }
+
+                var tielines = signalTypeFilter.HasValue
+                    ? TieLineCollection.Default.Where(tl => tl.Type.HasFlag(signalTypeFilter.Value))
+                    : TieLineCollection.Default;
+
+                var count = 0;
+                foreach (var tl in tielines)
+                {
+                    CrestronConsole.ConsoleCommandResponse("  {0}{1}", tl, CrestronEnvironment.NewLine);
+                    count++;
+                }
+
+                CrestronConsole.ConsoleCommandResponse("\r\nTotal: {0} tieline{1}{2}", count, count == 1 ? "" : "s", CrestronEnvironment.NewLine);
+            }
+            catch (Exception ex)
+            {
+                CrestronConsole.ConsoleCommandResponse("Error listing tielines: {0}\r\n", ex.Message);
+            }
+        }
+
+        private void VisualizeRoutes(string args)
+        {
+            try
+            {
+                if (args.Contains("?"))
+                {
+                    CrestronConsole.ConsoleCommandResponse("Usage: visualizeroutes [signaltype] [-s source] [-d destination]\r\n");
+                    CrestronConsole.ConsoleCommandResponse("  signaltype: Audio, Video, AudioVideo, etc.\r\n");
+                    CrestronConsole.ConsoleCommandResponse("  -s: Filter by source key (partial match)\r\n");
+                    CrestronConsole.ConsoleCommandResponse("  -d: Filter by destination key (partial match)\r\n");
+                    return;
+                }
+
+                ParseRouteFilters(args, out eRoutingSignalType? signalTypeFilter, out string sourceFilter, out string destFilter);
+
+                CrestronConsole.ConsoleCommandResponse("\r\n+===========================================================================+\r\n");
+                CrestronConsole.ConsoleCommandResponse("|                         ROUTE VISUALIZATION                               |\r\n");
+                CrestronConsole.ConsoleCommandResponse("+===========================================================================+\r\n\r\n");
+
+                foreach (var descriptorCollection in Extensions.RouteDescriptors.Where(kv => kv.Value.Descriptors.Count() > 0))
+                {
+                    // Filter by signal type if specified
+                    if (signalTypeFilter.HasValue && descriptorCollection.Key != signalTypeFilter.Value)
+                        continue;
+
+                    CrestronConsole.ConsoleCommandResponse("\r\n+--- Signal Type: {0} ({1} routes) ---\r\n",
+                        descriptorCollection.Key,
+                        descriptorCollection.Value.Descriptors.Count());
+
+                    foreach (var descriptor in descriptorCollection.Value.Descriptors)
+                    {
+                        // Filter by source/dest if specified
+                        if (sourceFilter != null && !descriptor.Source.Key.ToLower().Contains(sourceFilter))
+                            continue;
+                        if (destFilter != null && !descriptor.Destination.Key.ToLower().Contains(destFilter))
+                            continue;
+
+                        VisualizeRouteDescriptor(descriptor);
+                    }
+                }
+
+                CrestronConsole.ConsoleCommandResponse("\r\n");
+            }
+            catch (Exception ex)
+            {
+                CrestronConsole.ConsoleCommandResponse("Error visualizing routes: {0}\r\n", ex.Message);
+            }
+        }
+
+        private void VisualizeCurrentRoutes(string args)
+        {
+            try
+            {
+                if (args.Contains("?"))
+                {
+                    CrestronConsole.ConsoleCommandResponse("Usage: visualizecurrentroutes [signaltype] [-s source] [-d destination]\r\n");
+                    CrestronConsole.ConsoleCommandResponse("  signaltype: Audio, Video, AudioVideo, etc.\r\n");
+                    CrestronConsole.ConsoleCommandResponse("  -s: Filter by source key (partial match)\r\n");
+                    CrestronConsole.ConsoleCommandResponse("  -d: Filter by destination key (partial match)\r\n");
+                    return;
+                }
+
+                ParseRouteFilters(args, out eRoutingSignalType? signalTypeFilter, out string sourceFilter, out string destFilter);
+
+                CrestronConsole.ConsoleCommandResponse("\r\n+===========================================================================+\r\n");
+                CrestronConsole.ConsoleCommandResponse("|                    CURRENT ROUTES VISUALIZATION                            |\r\n");
+                CrestronConsole.ConsoleCommandResponse("+===========================================================================+\r\n\r\n");
+
+                var hasRoutes = false;
+
+                // Get all descriptors from DefaultCollection
+                var allDescriptors = RouteDescriptorCollection.DefaultCollection.Descriptors;
+
+                // Group by signal type
+                var groupedByType = allDescriptors.GroupBy(d => d.SignalType);
+
+                foreach (var group in groupedByType)
+                {
+                    var signalType = group.Key;
+
+                    // Filter by signal type if specified
+                    if (signalTypeFilter.HasValue && signalType != signalTypeFilter.Value)
+                        continue;
+
+                    var filteredDescriptors = group.Where(d =>
+                    {
+                        if (sourceFilter != null && !d.Source.Key.ToLower().Contains(sourceFilter))
+                            return false;
+                        if (destFilter != null && !d.Destination.Key.ToLower().Contains(destFilter))
+                            return false;
+                        return true;
+                    }).ToList();
+
+                    if (filteredDescriptors.Count == 0)
+                        continue;
+
+                    hasRoutes = true;
+                    CrestronConsole.ConsoleCommandResponse("\r\n+--- Signal Type: {0} ({1} routes) ---\r\n",
+                        signalType,
+                        filteredDescriptors.Count);
+
+                    foreach (var descriptor in filteredDescriptors)
+                    {
+                        VisualizeRouteDescriptor(descriptor);
+                    }
+                }
+
+                if (!hasRoutes)
+                {
+                    CrestronConsole.ConsoleCommandResponse("\r\nNo active routes found in current state.\r\n");
+                }
+
+                CrestronConsole.ConsoleCommandResponse("\r\n");
+            }
+            catch (Exception ex)
+            {
+                CrestronConsole.ConsoleCommandResponse("Error visualizing current state: {0}\r\n", ex.Message);
+            }
+        }
+
+        /// <summary>
+        /// Parses route filter arguments from command line
+        /// </summary>
+        /// <param name="args">Command line arguments</param>
+        /// <param name="signalTypeFilter">Parsed signal type filter (if any)</param>
+        /// <param name="sourceFilter">Parsed source filter (if any)</param>
+        /// <param name="destFilter">Parsed destination filter (if any)</param>
+        private void ParseRouteFilters(string args, out eRoutingSignalType? signalTypeFilter, out string sourceFilter, out string destFilter)
+        {
+            signalTypeFilter = null;
+            sourceFilter = null;
+            destFilter = null;
+
+            if (string.IsNullOrEmpty(args))
+                return;
+
+            var parts = args.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
+
+            for (int i = 0; i < parts.Length; i++)
+            {
+                var part = parts[i];
+
+                // Check for flags
+                if (part == "-s" && i + 1 < parts.Length)
+                {
+                    sourceFilter = parts[++i].ToLower();
+                }
+                else if (part == "-d" && i + 1 < parts.Length)
+                {
+                    destFilter = parts[++i].ToLower();
+                }
+                // Try to parse as signal type if not a flag and no signal type set yet
+                else if (!part.StartsWith("-") && !signalTypeFilter.HasValue)
+                {
+                    if (Enum.TryParse(part, true, out eRoutingSignalType parsedType))
+                    {
+                        signalTypeFilter = parsedType;
+                    }
+                }
+            }
+        }
+
+        /// <summary>
+        /// Visualizes a single route descriptor in a tree format
+        /// </summary>
+        private void VisualizeRouteDescriptor(RouteDescriptor descriptor)
+        {
+            CrestronConsole.ConsoleCommandResponse("|\r\n");
+            CrestronConsole.ConsoleCommandResponse("|-- {0} --> {1}\r\n",
+                descriptor.Source.Key,
+                descriptor.Destination.Key);
+
+            if (descriptor.Routes == null || descriptor.Routes.Count == 0)
+            {
+                CrestronConsole.ConsoleCommandResponse("|   +-- (No switching steps)\r\n");
+                return;
+            }
+
+            for (int i = 0; i < descriptor.Routes.Count; i++)
+            {
+                var route = descriptor.Routes[i];
+                var isLast = i == descriptor.Routes.Count - 1;
+                var prefix = isLast ? "+" : "|";
+                var continuation = isLast ? " " : "|";
+
+                if (route.SwitchingDevice != null)
+                {
+                    CrestronConsole.ConsoleCommandResponse("|   {0}-- [{1}] {2}\r\n",
+                        prefix,
+                        route.SwitchingDevice.Key,
+                        GetSwitchDescription(route));
+
+                    // Add visual connection line for non-last items
+                    if (!isLast)
+                        CrestronConsole.ConsoleCommandResponse("|   {0}      |\r\n", continuation);
+                }
+                else
+                {
+                    CrestronConsole.ConsoleCommandResponse("|   {0}-- {1}\r\n", prefix, route.ToString());
+                }
+            }
+        }
+
+        /// <summary>
+        /// Gets a readable description of the switching operation
+        /// </summary>
+        private string GetSwitchDescription(RouteSwitchDescriptor route)
+        {
+            if (route.OutputPort != null && route.InputPort != null)
+            {
+                return string.Format("{0} -> {1}", route.OutputPort.Key, route.InputPort.Key);
+            }
+            else if (route.InputPort != null)
+            {
+                return string.Format("-> {0}", route.InputPort.Key);
+            }
+            else
+            {
+                return "(passthrough)";
+            }
         }
 
         /// <summary>