Check that client is playing the right item

Send date when playback command is emitted
Rename some classes

MediaBrowser.Model/Syncplay/GroupUpdate.cs

@@ -1,9 +1,9 @@
 namespace MediaBrowser.Model.Syncplay
 {
     /// <summary>
-    /// Class SyncplayGroupUpdate.
+    /// Class GroupUpdate.
     /// </summary>
-    public class SyncplayGroupUpdate<T>
+    public class GroupUpdate<T>
     {
         /// <summary>
         /// Gets or sets the group identifier.
@@ -15,7 +15,7 @@ namespace MediaBrowser.Model.Syncplay
         /// Gets or sets the update type.
         /// </summary>
         /// <value>The update type.</value>
-        public SyncplayGroupUpdateType Type { get; set; }
+        public GroupUpdateType Type { get; set; }
 
         /// <summary>
         /// Gets or sets the data.

MediaBrowser.Model/Syncplay/GroupUpdateType.cs

@@ -1,9 +1,9 @@
 namespace MediaBrowser.Model.Syncplay
 {
     /// <summary>
-    /// Enum SyncplayGroupUpdateType
+    /// Enum GroupUpdateType
     /// </summary>
-    public enum SyncplayGroupUpdateType
+    public enum GroupUpdateType
     {
         /// <summary>
         /// The user-joined update. Tells members of a group about a new user.

MediaBrowser.Model/Syncplay/JoinGroupRequest.cs

@@ -0,0 +1,22 @@
+using System;
+
+namespace MediaBrowser.Model.Syncplay
+{
+    /// <summary>
+    /// Class JoinGroupRequest.
+    /// </summary>
+    public class JoinGroupRequest
+    {
+        /// <summary>
+        /// Gets or sets the Group id.
+        /// </summary>
+        /// <value>The Group id to join.</value>
+        public Guid GroupId { get; set; }
+
+        /// <summary>
+        /// Gets or sets the playing item id.
+        /// </summary>
+        /// <value>The client's currently playing item id.</value>
+        public Guid PlayingItemId { get; set; }
+    }
+}

MediaBrowser.Model/Syncplay/PlaybackRequest.cs

@@ -3,15 +3,15 @@ using System;
 namespace MediaBrowser.Model.Syncplay
 {
     /// <summary>
-    /// Class SyncplayRequestInfo.
+    /// Class PlaybackRequest.
     /// </summary>
-    public class SyncplayRequestInfo
+    public class PlaybackRequest
     {
         /// <summary>
         /// Gets or sets the request type.
         /// </summary>
         /// <value>The request type.</value>
-        public SyncplayRequestType Type;
+        public PlaybackRequestType Type;
 
         /// <summary>
         /// Gets or sets when the request has been made by the client.

MediaBrowser.Model/Syncplay/PlaybackRequestType.cs

@@ -1,9 +1,9 @@
 namespace MediaBrowser.Model.Syncplay
 {
     /// <summary>
-    /// Enum SyncplayRequestType
+    /// Enum PlaybackRequestType
     /// </summary>
-    public enum SyncplayRequestType
+    public enum PlaybackRequestType
     {
         /// <summary>
         /// A user is requesting a play command for the group.

MediaBrowser.Model/Syncplay/SendCommand.cs

@@ -1,9 +1,9 @@
 namespace MediaBrowser.Model.Syncplay
 {
     /// <summary>
-    /// Class SyncplayCommand.
+    /// Class SendCommand.
     /// </summary>
-    public class SyncplayCommand
+    public class SendCommand
     {
         /// <summary>
         /// Gets or sets the group identifier.
@@ -27,6 +27,12 @@ namespace MediaBrowser.Model.Syncplay
         /// Gets or sets the command.
         /// </summary>
         /// <value>The command.</value>
-        public SyncplayCommandType Command { get; set; }
+        public SendCommandType Command { get; set; }
+
+        /// <summary>
+        /// Gets or sets the UTC time when this command has been emitted.
+        /// </summary>
+        /// <value>The UTC time when this command has been emitted.</value>
+        public string EmittedAt { get; set; }
     }
 }

MediaBrowser.Model/Syncplay/SendCommandType.cs

@@ -1,9 +1,9 @@
 namespace MediaBrowser.Model.Syncplay
 {
     /// <summary>
-    /// Enum SyncplayCommandType.
+    /// Enum SendCommandType.
     /// </summary>
-    public enum SyncplayCommandType
+    public enum SendCommandType
     {
         /// <summary>
         /// The play command. Instructs users to start playback.