Successful sync test

Assets/Scripts/BonusFruit.cs

@@ -1,13 +1,12 @@
 namespace Marro.PacManUdon
 {
-    using Assets.Scripts;
     using UdonSharp;
     using UnityEngine;
     using VRC.SDK3.Data;
     using VRC.SDKBase;
     using VRC.Udon;
 
-    public class BonusFruit : SyncedObject 
+    public class BonusFruit : UdonSharpBehaviour
     {
         [SerializeField, UdonSynced, FieldChangeCallback(nameof(FruitType))] PacManFruitType fruitType;
 
@@ -84,16 +83,6 @@
             RequestSerialization();
         }
 
-        public override void AppendSyncedData(byte[][] data, ref int offset)
-        {
-
-        }
-
-        public override bool SetSyncedData(byte[] data, ref int offset)
-        {
-            return true;
-        }
-
         public PacManFruitType FruitType
         {
             set

Assets/Scripts/GameManager.cs

@@ -2,7 +2,6 @@
 
 namespace Marro.PacManUdon
 {
-    using Assets.Scripts;
     using System;
     using UdonSharp;
     using UnityEngine;
@@ -78,7 +77,7 @@ namespace Marro.PacManUdon
             playerInput.Initialize(this);
             soundManager.Initialize();
             intermission2Pole.Initialize(this, ghostManager.Ghosts[0]);
-            networkManager.Initialize(Networking.IsOwner(gameObject));
+            networkManager.Initialize();
 
             HideEverything();
 
@@ -423,7 +422,7 @@ namespace Marro.PacManUdon
             ghostManager.SetOwner(Networking.LocalPlayer);
         }
 
-        public override void AppendSyncedData(byte[][] data, ref int offset)
+        public override void AppendSyncedData(byte[][] data, ref int offset, NetworkEventType eventType, uint eventTime)
         {
             data[offset++] = new byte[] { Int32ToByte((int)gameState) };
             data[offset++] = BitConverter.GetBytes(currentlyInTimeSequence);
@@ -431,7 +430,7 @@ namespace Marro.PacManUdon
             data[offset++] = BitConverter.GetBytes(timeSequenceProgress);
         }
 
-        public override bool SetSyncedData(byte[] data, ref int offset)
+        public override bool SetSyncedData(byte[] data, ref int offset, NetworkEventType eventType, uint eventTime)
         {
             SetGameState((PacManGameState)data[offset++]);
 
@@ -444,6 +443,11 @@ namespace Marro.PacManUdon
             return true;
         }
 
+        public override void SyncedToNewTime(uint oldTime, uint newTime)
+        {
+            
+        }
+
         public int ExtraLives
         {
             set
@@ -499,6 +503,7 @@ namespace Marro.PacManUdon
         }
 
         public static byte Int32ToByte(int value) =>
-            byte.Parse(value.ToString()); // This is the only way I could find to cast an int to byte in Udon, a regular cast crashes in runtime...
+            (byte)value;
+            //byte.Parse(value.ToString()); // This is the only way I could find to cast an int to byte in Udon, a regular cast crashes in runtime...
     }
 }

Assets/Scripts/Ghost.cs

@@ -779,9 +779,9 @@ namespace Marro.PacManUdon
             UpdateAnimator();
         }
 
-        public override void AppendSyncedData(byte[][] data, ref int offset)
+        public override void AppendSyncedData(byte[][] data, ref int offset, NetworkEventType eventType, uint eventTime)
         {
-            base.AppendSyncedData(data, ref offset);
+            base.AppendSyncedData(data, ref offset, eventType, eventTime);
         }
 
         void OnTriggerEnter(Collider other)

Assets/Scripts/GridMover.cs

@@ -1,6 +1,5 @@
 namespace Marro.PacManUdon
 {
-    using Assets.Scripts;
     using System;
     using UdonSharp;
     using UnityEngine;
@@ -33,7 +32,7 @@ namespace Marro.PacManUdon
 
         protected abstract void UpdateAnimator();
 
-        public override void AppendSyncedData(byte[][] data, ref int offset)
+        public override void AppendSyncedData(byte[][] data, ref int offset, NetworkEventType eventType, uint eventTime)
         {
             var position = GetPosition();
             data[offset++] = BitConverter.GetBytes(position.x);
@@ -44,7 +43,7 @@ namespace Marro.PacManUdon
             data[offset++] = BitConverter.GetBytes(direction.y);
         }
 
-        public override bool SetSyncedData(byte[] data, ref int offset)
+        public override bool SetSyncedData(byte[] data, ref int offset, NetworkEventType eventType, uint eventTime)
         {
             SetPosition(new Vector2(BitConverter.ToSingle(data, offset), BitConverter.ToSingle(data, offset + 2)));
             SetDirection(new Vector2(BitConverter.ToSingle(data, offset + 4), BitConverter.ToSingle(data, offset + 6)));
@@ -52,5 +51,10 @@ namespace Marro.PacManUdon
 
             return true;
         }
+
+        public override void SyncedToNewTime(uint oldTime, uint newTime)
+        {
+
+        }
     }
 }

Assets/Scripts/NetworkManager.asset

@@ -43,7 +43,7 @@ MonoBehaviour:
       Data: 
     - Name: 
       Entry: 12
-      Data: 7
+      Data: 10
     - Name: 
       Entry: 7
       Data: 
@@ -61,7 +61,7 @@ MonoBehaviour:
       Data: 3|System.RuntimeType, mscorlib
     - Name: 
       Entry: 1
-      Data: Assets.Scripts.SyncedObject[], Assembly-CSharp
+      Data: Marro.PacManUdon.SyncedObject[], Assembly-CSharp
     - Name: 
       Entry: 8
       Data: 
@@ -115,19 +115,19 @@ MonoBehaviour:
       Data: 
     - Name: $k
       Entry: 1
-      Data: isOwner
+      Data: DebugImageToIndicateOwner
     - Name: $v
       Entry: 7
       Data: 7|UdonSharp.Compiler.FieldDefinition, UdonSharp.Editor
     - Name: <Name>k__BackingField
       Entry: 1
-      Data: isOwner
+      Data: DebugImageToIndicateOwner
     - Name: <UserType>k__BackingField
       Entry: 7
       Data: 8|System.RuntimeType, mscorlib
     - Name: 
       Entry: 1
-      Data: System.Boolean, mscorlib
+      Data: UnityEngine.Animator, UnityEngine.AnimationModule
     - Name: 
       Entry: 8
       Data: 
@@ -145,13 +145,19 @@ MonoBehaviour:
       Data: 
     - Name: <IsSerialized>k__BackingField
       Entry: 5
-      Data: false
+      Data: true
     - Name: _fieldAttributes
       Entry: 7
       Data: 9|System.Collections.Generic.List`1[[System.Attribute, mscorlib]], mscorlib
     - Name: 
       Entry: 12
-      Data: 0
+      Data: 1
+    - Name: 
+      Entry: 7
+      Data: 10|UnityEngine.SerializeField, UnityEngine.CoreModule
+    - Name: 
+      Entry: 8
+      Data: 
     - Name: 
       Entry: 13
       Data: 
@@ -169,25 +175,25 @@ MonoBehaviour:
       Data: 
     - Name: $k
       Entry: 1
-      Data: startTimeTicks
+      Data: isOwner
     - Name: $v
       Entry: 7
-      Data: 10|UdonSharp.Compiler.FieldDefinition, UdonSharp.Editor
+      Data: 11|UdonSharp.Compiler.FieldDefinition, UdonSharp.Editor
     - Name: <Name>k__BackingField
       Entry: 1
-      Data: startTimeTicks
+      Data: isOwner
     - Name: <UserType>k__BackingField
       Entry: 7
-      Data: 11|System.RuntimeType, mscorlib
+      Data: 12|System.RuntimeType, mscorlib
     - Name: 
       Entry: 1
-      Data: System.Int64, mscorlib
+      Data: System.Boolean, mscorlib
     - Name: 
       Entry: 8
       Data: 
     - Name: <SystemType>k__BackingField
       Entry: 9
-      Data: 11
+      Data: 12
     - Name: <SyncMode>k__BackingField
       Entry: 7
       Data: System.Nullable`1[[UdonSharp.UdonSyncMode, UdonSharp.Runtime]], mscorlib
@@ -202,7 +208,7 @@ MonoBehaviour:
       Data: false
     - Name: _fieldAttributes
       Entry: 7
-      Data: 12|System.Collections.Generic.List`1[[System.Attribute, mscorlib]], mscorlib
+      Data: 13|System.Collections.Generic.List`1[[System.Attribute, mscorlib]], mscorlib
     - Name: 
       Entry: 12
       Data: 0
@@ -223,25 +229,19 @@ MonoBehaviour:
       Data: 
     - Name: $k
       Entry: 1
-      Data: nextEventTime
+      Data: isSynced
     - Name: $v
       Entry: 7
-      Data: 13|UdonSharp.Compiler.FieldDefinition, UdonSharp.Editor
+      Data: 14|UdonSharp.Compiler.FieldDefinition, UdonSharp.Editor
     - Name: <Name>k__BackingField
       Entry: 1
-      Data: nextEventTime
+      Data: isSynced
     - Name: <UserType>k__BackingField
-      Entry: 7
+      Entry: 9
-      Data: 14|System.RuntimeType, mscorlib
+      Data: 12
-    - Name: 
-      Entry: 1
-      Data: System.UInt32, mscorlib
-    - Name: 
-      Entry: 8
-      Data: 
     - Name: <SystemType>k__BackingField
       Entry: 9
-      Data: 14
+      Data: 12
     - Name: <SyncMode>k__BackingField
       Entry: 7
       Data: System.Nullable`1[[UdonSharp.UdonSyncMode, UdonSharp.Runtime]], mscorlib
@@ -277,19 +277,19 @@ MonoBehaviour:
       Data: 
     - Name: $k
       Entry: 1
-      Data: buffer
+      Data: startTimeTicks
     - Name: $v
       Entry: 7
       Data: 16|UdonSharp.Compiler.FieldDefinition, UdonSharp.Editor
     - Name: <Name>k__BackingField
       Entry: 1
-      Data: buffer
+      Data: startTimeTicks
     - Name: <UserType>k__BackingField
       Entry: 7
       Data: 17|System.RuntimeType, mscorlib
     - Name: 
       Entry: 1
-      Data: System.Byte[], mscorlib
+      Data: System.Int64, mscorlib
     - Name: 
       Entry: 8
       Data: 
@@ -331,19 +331,19 @@ MonoBehaviour:
       Data: 
     - Name: $k
       Entry: 1
-      Data: index
+      Data: nextEventTime
     - Name: $v
       Entry: 7
       Data: 19|UdonSharp.Compiler.FieldDefinition, UdonSharp.Editor
     - Name: <Name>k__BackingField
       Entry: 1
-      Data: index
+      Data: nextEventTime
     - Name: <UserType>k__BackingField
       Entry: 7
       Data: 20|System.RuntimeType, mscorlib
     - Name: 
       Entry: 1
-      Data: System.Int32, mscorlib
+      Data: System.UInt32, mscorlib
     - Name: 
       Entry: 8
       Data: 
@@ -385,19 +385,175 @@ MonoBehaviour:
       Data: 
     - Name: $k
       Entry: 1
-      Data: networkedData
+      Data: retriesWithoutSuccess
     - Name: $v
       Entry: 7
       Data: 22|UdonSharp.Compiler.FieldDefinition, UdonSharp.Editor
+    - Name: <Name>k__BackingField
+      Entry: 1
+      Data: retriesWithoutSuccess
+    - Name: <UserType>k__BackingField
+      Entry: 7
+      Data: 23|System.RuntimeType, mscorlib
+    - Name: 
+      Entry: 1
+      Data: System.Int32, mscorlib
+    - Name: 
+      Entry: 8
+      Data: 
+    - Name: <SystemType>k__BackingField
+      Entry: 9
+      Data: 23
+    - Name: <SyncMode>k__BackingField
+      Entry: 7
+      Data: System.Nullable`1[[UdonSharp.UdonSyncMode, UdonSharp.Runtime]], mscorlib
+    - Name: 
+      Entry: 6
+      Data: 
+    - Name: 
+      Entry: 8
+      Data: 
+    - Name: <IsSerialized>k__BackingField
+      Entry: 5
+      Data: false
+    - Name: _fieldAttributes
+      Entry: 7
+      Data: 24|System.Collections.Generic.List`1[[System.Attribute, mscorlib]], mscorlib
+    - Name: 
+      Entry: 12
+      Data: 0
+    - Name: 
+      Entry: 13
+      Data: 
+    - Name: 
+      Entry: 8
+      Data: 
+    - Name: 
+      Entry: 8
+      Data: 
+    - Name: 
+      Entry: 8
+      Data: 
+    - Name: 
+      Entry: 7
+      Data: 
+    - Name: $k
+      Entry: 1
+      Data: buffer
+    - Name: $v
+      Entry: 7
+      Data: 25|UdonSharp.Compiler.FieldDefinition, UdonSharp.Editor
+    - Name: <Name>k__BackingField
+      Entry: 1
+      Data: buffer
+    - Name: <UserType>k__BackingField
+      Entry: 7
+      Data: 26|System.RuntimeType, mscorlib
+    - Name: 
+      Entry: 1
+      Data: System.Byte[], mscorlib
+    - Name: 
+      Entry: 8
+      Data: 
+    - Name: <SystemType>k__BackingField
+      Entry: 9
+      Data: 26
+    - Name: <SyncMode>k__BackingField
+      Entry: 7
+      Data: System.Nullable`1[[UdonSharp.UdonSyncMode, UdonSharp.Runtime]], mscorlib
+    - Name: 
+      Entry: 6
+      Data: 
+    - Name: 
+      Entry: 8
+      Data: 
+    - Name: <IsSerialized>k__BackingField
+      Entry: 5
+      Data: false
+    - Name: _fieldAttributes
+      Entry: 7
+      Data: 27|System.Collections.Generic.List`1[[System.Attribute, mscorlib]], mscorlib
+    - Name: 
+      Entry: 12
+      Data: 0
+    - Name: 
+      Entry: 13
+      Data: 
+    - Name: 
+      Entry: 8
+      Data: 
+    - Name: 
+      Entry: 8
+      Data: 
+    - Name: 
+      Entry: 8
+      Data: 
+    - Name: 
+      Entry: 7
+      Data: 
+    - Name: $k
+      Entry: 1
+      Data: index
+    - Name: $v
+      Entry: 7
+      Data: 28|UdonSharp.Compiler.FieldDefinition, UdonSharp.Editor
+    - Name: <Name>k__BackingField
+      Entry: 1
+      Data: index
+    - Name: <UserType>k__BackingField
+      Entry: 9
+      Data: 23
+    - Name: <SystemType>k__BackingField
+      Entry: 9
+      Data: 23
+    - Name: <SyncMode>k__BackingField
+      Entry: 7
+      Data: System.Nullable`1[[UdonSharp.UdonSyncMode, UdonSharp.Runtime]], mscorlib
+    - Name: 
+      Entry: 6
+      Data: 
+    - Name: 
+      Entry: 8
+      Data: 
+    - Name: <IsSerialized>k__BackingField
+      Entry: 5
+      Data: false
+    - Name: _fieldAttributes
+      Entry: 7
+      Data: 29|System.Collections.Generic.List`1[[System.Attribute, mscorlib]], mscorlib
+    - Name: 
+      Entry: 12
+      Data: 0
+    - Name: 
+      Entry: 13
+      Data: 
+    - Name: 
+      Entry: 8
+      Data: 
+    - Name: 
+      Entry: 8
+      Data: 
+    - Name: 
+      Entry: 8
+      Data: 
+    - Name: 
+      Entry: 7
+      Data: 
+    - Name: $k
+      Entry: 1
+      Data: networkedData
+    - Name: $v
+      Entry: 7
+      Data: 30|UdonSharp.Compiler.FieldDefinition, UdonSharp.Editor
     - Name: <Name>k__BackingField
       Entry: 1
       Data: networkedData
     - Name: <UserType>k__BackingField
       Entry: 9
-      Data: 17
+      Data: 26
     - Name: <SystemType>k__BackingField
       Entry: 9
-      Data: 17
+      Data: 26
     - Name: <SyncMode>k__BackingField
       Entry: 7
       Data: System.Nullable`1[[UdonSharp.UdonSyncMode, UdonSharp.Runtime]], mscorlib
@@ -412,13 +568,13 @@ MonoBehaviour:
       Data: false
     - Name: _fieldAttributes
       Entry: 7
-      Data: 23|System.Collections.Generic.List`1[[System.Attribute, mscorlib]], mscorlib
+      Data: 31|System.Collections.Generic.List`1[[System.Attribute, mscorlib]], mscorlib
     - Name: 
       Entry: 12
       Data: 1
     - Name: 
       Entry: 7
-      Data: 24|UdonSharp.UdonSyncedAttribute, UdonSharp.Runtime
+      Data: 32|UdonSharp.UdonSyncedAttribute, UdonSharp.Runtime
     - Name: 
       Entry: 8
       Data: 

Assets/Scripts/NetworkManager.cs

@@ -1,21 +1,19 @@
-using Assets.Scripts;
+using System;
-using JetBrains.Annotations;
+using System.Drawing;
-using System;
-using System.Linq;
 using System.Text;
 using UdonSharp;
 using UnityEngine;
-using UnityEngine.UIElements;
-using VRC.SDK3.Data;
 using VRC.SDK3.UdonNetworkCalling;
+using VRC.SDKBase;
+using VRC.Udon.ClientBindings.Interfaces;
 using VRC.Udon.Common;
-using static VRC.SDKBase.Networking;
 
 namespace Marro.PacManUdon
 {
-    enum NetworkEventType
+    public enum NetworkEventType
     {
         FullSync = 0,
+        PacManTurn = 1,
     }
     public class NetworkManager : UdonSharpBehaviour
     {
@@ -32,33 +30,58 @@ namespace Marro.PacManUdon
         // Correct parsing is dependend upon everything being read out identially to how it was created.
 
         // An event has the following structure:
-        // [0-3]: (uint) Time in seconds at which event occured.
+        // [0-1]: (ushort) Size of event.
-        // [4]: (byte) Type of event: 0 = Full Sync, others will be defined later.
+        // [2-5]: (uint) Time in seconds at which event occured.
-        // [5+]: Event-specific data
+        // [6]: (byte) Type of event. 0 = Full Sync, which is used to sync up from an undefinted state.
+        // [7+]: Event-specific data
 
-        const int BufferSizeBytes = 1000;
+        private const int BufferMaxSizeBytes = 10000;
+        private const int BufferIncrementSizeBytes = 1000;
 
-        [SerializeField]
+        [SerializeField] private SyncedObject[] syncedObjects;
-        private SyncedObject[] syncedObjects;
+
+        [SerializeField] private Animator DebugImageToIndicateOwner;
 
         private bool isOwner;
+        private bool isSynced;
 
-        private long startTimeTicks;
+        private long startTimeTicks = DateTime.UtcNow.Ticks; // Initialize to prevent errors
 
         private uint nextEventTime;
 
+        private int retriesWithoutSuccess;
+
         // Main buffer of events
         private byte[] buffer;
         private int index;
 
-        [UdonSynced] private byte[] networkedData;
+        private const ushort HeaderEventSizeIndex = 0;
+        private const ushort HeaderTimestampIndex = 2;
+        private const ushort HeaderEventTypeIndex = 6;
+        private const ushort HeaderLength = 7;
 
-        public void Initialize(bool isOwner)
+        private const int Delay = 250;
+
+        [UdonSynced] private byte[] networkedData = new byte[0];
+
+        public void Initialize()
         {
-            buffer = new byte[BufferSizeBytes];
+            if (!BitConverter.IsLittleEndian)
+            {
+                Debug.LogError($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Fatal: NetworkManager only supports little endian! Network sync will not be possible.");
+                var zero = 0;
+                Debug.Log(1 / zero); // Intentionally crash
+                return;
+            }
+
+            buffer = new byte[BufferIncrementSizeBytes];
             index = 0;
             startTimeTicks = DateTime.UtcNow.Ticks;
-            this.isOwner = isOwner;
+            isSynced = false;
+            retriesWithoutSuccess = 0;
+            SetOwner(Networking.IsOwner(gameObject));
+
+            Debug.Log($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Initialized, startTimeTicks: {startTimeTicks}");
         }
 
         public void Update()
@@ -69,65 +92,141 @@ namespace Marro.PacManUdon
             }
         }
 
-        [NetworkCallable]
+        public void SendEvent(NetworkEventType eventType)
-        public void DoFullSync()
         {
             if (!isOwner)
             {
-                Debug.LogError($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Attempted {nameof(DoFullSync)} while not the owner!");
+                Debug.LogError($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Attempted {nameof(SendEvent)} while not the owner!");
                 return;
             }
 
-            InitializeEvent(NetworkEventType.FullSync, 1000, out byte[][] data, out var index);
+            var eventTime = CurrentTime;
+
+            InitializeEvent(eventType, eventTime, BufferMaxSizeBytes, out byte[][] data, out var index);
 
             foreach (var obj in syncedObjects)
             {
-                obj.AppendSyncedData(data, ref index);
+                obj.AppendSyncedData(data, ref index, eventType, eventTime);
             }
 
-            var eventSize = 0;
+            // Get event size, skipping over the event size which is not yet included
+            ushort eventSize = 0;
             for (int i = 0; i < index; i++)
             {
-                eventSize += data[i].Length;
+                eventSize += (ushort)data[i].Length;
             }
 
-            if (!EnsureSpaceToStorePreparedEvent(eventSize))
+            if (!EnsureSpaceToStoreEvent(eventSize))
             {
                 return;
             }
 
+            data[0] = BitConverter.GetBytes(eventSize);
+
             var oldIndex = this.index;
 
             FlattenAndCopy(data, index, buffer, ref this.index);
 
-            Debug.Log($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Prepared event with {eventSize} bytes for serialization, index went from {oldIndex} to {this.index}");
+            Debug.Log($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Prepared event with {eventSize} bytes and timestamp {eventTime} for serialization, index went from {oldIndex} to {this.index}");
 
             RequestSerialization();
+
+            retriesWithoutSuccess = 0; // We had success!
         }
 
-        public void RequestFullSync()
+        public void RequestEvent(NetworkEventType eventType)
         {
             if (isOwner)
             {
-                Debug.LogError($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Attempted {nameof(RequestFullSync)} while we are the owner!");
+                Debug.LogError($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Attempted {nameof(RequestEvent)} while we are the owner!");
                 return;
             }
 
-            SendCustomNetworkEvent(VRC.Udon.Common.Interfaces.NetworkEventTarget.Owner, "DoFullSync");
+            SendCustomNetworkEvent(VRC.Udon.Common.Interfaces.NetworkEventTarget.Owner, "RequestEventReceived", eventType);
+        }
+
+        [NetworkCallable]
+        public void RequestEventReceived(NetworkEventType eventType)
+        {
+            if (!isOwner)
+            {
+                Debug.LogError($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Attempted {nameof(RequestEventReceived)} while we are not the owner!");
+                return;
+            }
+
+            SendEvent(eventType);
         }
 
         private void ProcessIncomingData()
         {
-            var syncType = (NetworkEventType)networkedData[4];
+            if (networkedData.Length == 0)
-            var size = networkedData.Length;
+            {
+                return; // Nothing to process
+            }
 
-            if (!EnsureSpaceToStoreReceivedEvent(size, syncType == NetworkEventType.FullSync))
+            var length = networkedData.Length;
+            int index = 0;
+            while (index < length)
+            {
+                if (length - index < HeaderLength)
+                {
+                    Debug.LogWarning($"({nameof(PacManUdon)} {nameof(NetworkManager)}) {nameof(ProcessIncomingData)}: Remaining data in networkedData is not long enough to form a complete event!");
+                    HandleError();
+                    return;
+                }
+
+                var eventSize = networkedData[index + HeaderEventSizeIndex];
+                var eventType = (NetworkEventType)networkedData[index + HeaderEventTypeIndex];
+
+                if (eventType == NetworkEventType.FullSync)
+                {
+                    ProcessIncomingFullSync(index, eventSize); // Immediately process full sync
+                    index += eventSize;
+                    continue;
+                }
+
+                if (!isSynced)
+                {
+                    Debug.LogWarning($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Received event of type {eventType} while we are not yet synced to the remote time, ignoring event.");
+                    index += eventSize;
+                    continue;
+                }
+
+                AppendEventToBuffer(index, eventSize);
+                index += eventSize;
+            }
+
+            Debug.Log($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Received {networkedData.Length} bytes!\nBytes received:\n{BytesToString(networkedData)}");
+        }
+
+        private void ProcessIncomingFullSync(int index, int size)
+        {
+            // Intentionally not doing a buffer size check here, since this is not appending to the buffer
+            // (and there is no good way to continue if event is too large)
+
+            // Clear buffer and copy the full sync into it
+            buffer = new byte[size];
+            Array.Copy(networkedData, index, buffer, 0, size);
+            this.index = size;
+
+            // Sync up to the time in the full sync
+            var time = BitConverter.ToUInt32(networkedData, index + HeaderTimestampIndex);
+            SyncToTime(time);
+
+            // Immediately apply the full sync
+            nextEventTime = time;
+            isSynced = true;
+        }
+
+        private void AppendEventToBuffer(int index, int size)
+        {
+            if (!EnsureSpaceToStoreEvent(size))
             {
                 return;
             }
 
-            Array.Copy(networkedData, 0, buffer, index, size);
+            Array.Copy(networkedData, index, buffer, this.index, size);
-            index += size;
+            this.index += size;
 
             UpdateNextEventTime();
         }
@@ -137,120 +236,140 @@ namespace Marro.PacManUdon
             var currentTime = CurrentTime;
             while (index != 0 && nextEventTime <= currentTime)
             {
-                ProcessNextEvent();
+                ProcessIncomingEvent();
                 UpdateNextEventTime();
             }
         }
 
         private void UpdateNextEventTime()
         {
-            if (index > 0)
+            if (index == 0)
             {
-                var nextEventTime = BitConverter.ToUInt32(buffer, 0);
+                return;
-                if (nextEventTime >= this.nextEventTime)
+            }
-                {
+
-                    this.nextEventTime = nextEventTime;
+            var nextEventTime = BitConverter.ToUInt32(buffer, HeaderTimestampIndex);
-                }
+            if (nextEventTime >= this.nextEventTime)
-                else
+            {
-                {
+                this.nextEventTime = nextEventTime;
-                    Debug.LogWarning($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Events are in invalid order! Clearing buffer.");
+            }
-                    ClearBuffer();
+            else
-                    return;
+            {
-                }
+                Debug.LogWarning($"({nameof(PacManUdon)} {nameof(NetworkManager)}) New event is earlier than previous event!");
+                HandleError();
+                return;
             }
         }
 
-        private void ProcessNextEvent()
+        private void ProcessIncomingEvent()
         {
-            var eventType = (NetworkEventType)buffer[4];
+            var eventTime = BitConverter.ToUInt32(buffer, HeaderTimestampIndex);
+            var eventType = (NetworkEventType)buffer[HeaderEventTypeIndex];
+            var index = (int)HeaderLength; // Skip header
 
-            switch (eventType)
+            if (false) // TODO: check event type
             {
-                default:
+                Debug.LogWarning($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Invalid event type for incoming data! Buffer will be cleared.");
-                    Debug.LogWarning($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Invalid sync type for incoming data! Buffer will be cleared.");
+                HandleError();
-                    ClearBuffer();
+                return;
-                    return;
-                case NetworkEventType.FullSync:
-                    ProcessFullSync();
-                    return;
             }
-        }
 
-        private void ProcessFullSync()
-        {
-            var index = 5; // Skip header
             foreach (var obj in syncedObjects)
             {
-                var success = obj.SetSyncedData(buffer, ref index);
+                var success = obj.SetSyncedData(buffer, ref index, eventType, eventTime);
 
                 if (!success)
                 {
-                    Debug.LogWarning($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Malformed data reported by {obj.name} during full sync! Clearing buffer and requesting new full sync.");
+                    Debug.LogWarning($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Malformed data reported by {obj.name} during event type {eventType}! Resetting state.");
-                    ClearBuffer();
+                    HandleError();
-                    RequestFullSync();
                     return;
                 }
+
+                if (index > this.index)
+                {
+                    Debug.LogWarning($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Buffer overflow during SetSyncedData for {obj.name} in event type {eventType}! Resetting state.");
+                    HandleError();
+                    return;
+                }
+            }
+
+            var eventSize = BitConverter.ToUInt16(buffer, HeaderEventSizeIndex);
+            if (index != eventSize)
+            {
+                Debug.LogWarning($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Amount of data read does not match event size! Expected {eventSize}, read {index}.");
+                HandleError();
+                return;
             }
 
             RemoveProcessedDataFromBuffer(index);
 
-            Debug.Log($"Processed full sync! Total {index} bytes.");
+            Debug.Log($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Processed incoming event! Total {index} bytes.");
+
+            retriesWithoutSuccess = 0; // We had success!
         }
 
-        private bool EnsureSpaceToStorePreparedEvent(int eventSize)
+        private void SyncToTime(uint newTime)
+        {
+            var timeToSyncTo = newTime - Delay;
+            startTimeTicks = DateTime.UtcNow.Ticks - timeToSyncTo * TimeSpan.TicksPerMillisecond;
+            Debug.Log($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Synced to time {newTime}, startTimeTicks is now {startTimeTicks}");
+        }
+
+        private bool EnsureSpaceToStoreEvent(int eventSize)
         {
             if (index + eventSize <= buffer.Length)
             {
                 return true; // Enough space!
             }
 
+            var newBufferSize = ((index + eventSize) / BufferIncrementSizeBytes + 1) * BufferIncrementSizeBytes;
+
+            var success = IncreaseBufferSize(newBufferSize);
+            if (success)
+            {
+                return true;
+            }
+
             if (index == 0)
             {
-                Debug.LogError($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Buffer is not large enough to store event! Viewing remote play is not possible.");
+                Debug.LogError($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Buffer is not large enough to store event!");
-                return false; // Unable to store event, networking features will not function.
+            }
+            else
+            {
+                Debug.LogWarning($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Too much data in buffer to store event!");
             }
 
-            ClearBuffer();
+            HandleError(); // We can store event now that we cleared the buffer.
-
+            return false;
-            Debug.LogWarning($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Too much data in buffer to store event! Old events will be discarded.");
-            return true; // We can store event now that we cleared the buffer.
         }
 
-        private bool EnsureSpaceToStoreReceivedEvent(int eventSize, bool isFullSync)
+        private bool IncreaseBufferSize(int newSize)
         {
-            if (index + eventSize <= buffer.Length)
+            if (newSize < buffer.Length)
             {
-                return true; // Enough space!
+                Debug.Log($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Cannot decrease the size of the buffer!");
+                return false;
             }
 
-            if (isFullSync && index == 0)
+            if (newSize > BufferMaxSizeBytes)
             {
-                Debug.LogError($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Buffer is not large enough to store full sync! Viewing remote play is not possible.");
+                return false;
-                return false; // Unable to store full sync, networking features will not function.
             }
 
-            ClearBuffer();
+            var oldBuffer = buffer;
-
+            buffer = new byte[newSize];
-            if (!isFullSync)
+            oldBuffer.CopyTo(buffer, 0);
-            {
+            return true;
-                Debug.LogWarning($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Too much data in buffer to store event! Old events will be discarded, and full sync will be performed.");
-
-                RequestFullSync();
-
-                return false; // No use storing this event, we're going to wait for the full sync.
-            }
-
-            Debug.LogWarning($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Too much data in buffer to store full sync! Old events will be discarded.");
-            return true; // We can store event now that we cleared the buffer.
         }
 
-        private void InitializeEvent(NetworkEventType eventType, int maxSize, out byte[][] data, out int index)
+        private void InitializeEvent(NetworkEventType eventType, uint eventTime, int maxSize, out byte[][] data, out int index)
         {
             data = new byte[maxSize][];
-            index = 2;
+            index = 3;
 
-            data[0] = BitConverter.GetBytes(CurrentTime);
+            data[0] = new byte[2]; // Placeholder for event size 
-            data[1] = new byte[] { GameManager.Int32ToByte((int)eventType) };
+            data[1] = BitConverter.GetBytes(eventTime);
+            data[2] = new byte[] { GameManager.Int32ToByte((int)eventType) };
         }
 
         private void FlattenAndCopy(byte[][] data, int length, byte[] target, ref int index)
@@ -267,16 +386,62 @@ namespace Marro.PacManUdon
         {
             var oldBuffer = buffer;
             index -= amountProcessed;
-            buffer = new byte[BufferSizeBytes];
+            buffer = new byte[BufferMaxSizeBytes];
             Array.Copy(oldBuffer, amountProcessed, buffer, 0, index);
         }
 
         private void ClearBuffer()
         {
-            buffer = new byte[BufferSizeBytes];
+            buffer = new byte[BufferMaxSizeBytes];
             index = 0;
         }
 
+        private void HandleError()
+        {
+            retriesWithoutSuccess++;
+
+            if (retriesWithoutSuccess > 3)
+            {
+                Debug.LogError($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Fatal: Retried 3 times without success.");
+                var zero = 0;
+                Debug.Log(1 / zero); // Intentionally crash
+                return;
+            }
+
+            Debug.LogWarning($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Encountered data error, attempting to recover via full sync.");
+
+            ClearBuffer();
+
+            if (!isOwner)
+            {
+                RequestEvent(NetworkEventType.FullSync);
+            }
+            else
+            {
+                SendEvent(NetworkEventType.FullSync);
+            }
+        }
+
+        private void SetOwner(bool isOwner)
+        {
+            this.isOwner = isOwner;
+
+            if (DebugImageToIndicateOwner != null)
+            {
+                DebugImageToIndicateOwner.SetFloat("Color", isOwner ? 1 : 0);
+            }
+        }
+
+        public override void OnOwnershipTransferred(VRCPlayerApi newOwner)
+        {
+            SetOwner(newOwner == Networking.LocalPlayer);
+
+            if(isOwner)
+            {
+                HandleError();
+            }
+        }
+
         public override void OnPreSerialization()
         {
             if (isOwner)
@@ -284,24 +449,30 @@ namespace Marro.PacManUdon
                 networkedData = new byte[index];
                 Array.Copy(buffer, networkedData, index);
             }
+            else
+            {
+                networkedData = new byte[0]; // Prevent exception loop in VRChat SDK
+            }
         }
 
         public override void OnPostSerialization(SerializationResult result)
         {
             if (!result.success)
             {
-                Debug.LogWarning($"Serialization failed! Tried to send {result.byteCount} bytes.");
+                Debug.LogWarning($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Serialization failed! Tried to send {result.byteCount} bytes.");
                 return;
             }
-            
-            Debug.Log($"Serialized with {result.byteCount} bytes!");
 
-            if (isOwner)
+            if (!isOwner || networkedData.Length == 0)
             {
-                // Remove all transferred data from the buffer, leaving data that came in after serialization
+                return;
-                RemoveProcessedDataFromBuffer(networkedData.Length);
-                networkedData = null;
             }
+
+            Debug.Log($"({nameof(PacManUdon)} {nameof(NetworkManager)}) Serialized with {networkedData.Length} bytes!\nBytes sent:\n{BytesToString(networkedData)}");
+
+            // Remove all transferred data from the buffer, leaving data that came in after serialization
+            RemoveProcessedDataFromBuffer(networkedData.Length);
+            networkedData = null;
         }
 
         public override void OnDeserialization()
@@ -312,8 +483,24 @@ namespace Marro.PacManUdon
             }
         }
 
+        public float GetDtInSeconds(uint currentTime, uint lastUpdate)
+        {
+            return (CurrentTime - lastUpdate) / 1000f;
+        }
+
         public uint CurrentTime => (uint)((DateTime.UtcNow.Ticks - startTimeTicks) / TimeSpan.TicksPerMillisecond);
 
         public bool IsOwner => isOwner;
+
+        public string BytesToString(byte[] bytes)
+        {
+            var sb = new StringBuilder("new byte[] { ");
+            foreach (var b in bytes)
+            {
+                sb.Append(b + ", ");
+            }
+            sb.Append("}");
+            return sb.ToString();
+        }
     }
 }

Assets/Scripts/SyncedObject.cs

@@ -2,11 +2,12 @@
 using UdonSharp;
 using UnityEngine;
 
-namespace Assets.Scripts
+namespace Marro.PacManUdon
 {
     public abstract class SyncedObject : UdonSharpBehaviour
     {
-        public abstract void AppendSyncedData(byte[][] data, ref int index);
+        public abstract void AppendSyncedData(byte[][] data, ref int index, NetworkEventType eventType, uint eventTime);
-        public abstract bool SetSyncedData(byte[] data, ref int index);
+        public abstract bool SetSyncedData(byte[] data, ref int index, NetworkEventType eventType, uint eventTime);
+        public abstract void SyncedToNewTime(uint oldTime, uint newTime);
     }
 }

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Assets/Test stuff/TestBall.cs

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+using librsync.net;
+using Marro.PacManUdon;
+using System;
+using System.Drawing.Text;
+using UnityEngine;
+
+public class TestBall : SyncedObject
+{
+    [SerializeField] private NetworkManager networkManager;
+    [SerializeField] private Transform start;
+    [SerializeField] private Transform end;
+
+    private const int LoopTimeMs = 1000;
+    private const float MaxUp = 0.7f;
+    private const float UpPerPress = 0.4f;
+    private const float DownPerSecond = 1;
+
+    private float amountUp = 0;
+    private int loopOffset = 0;
+    private uint lastUpdate;
+
+    private void Start()
+    {
+        networkManager.Initialize();
+        lastUpdate = networkManager.CurrentTime;
+    }
+
+    public void FixedUpdate()
+    {
+        var currentTime = networkManager.CurrentTime;
+        float dt = networkManager.GetDtInSeconds(currentTime, lastUpdate);
+        DeltaUp(-DownPerSecond * dt);
+
+        float progress = GetProgress(currentTime);
+        transform.position = Vector3.Lerp(start.position, end.position, progress) + amountUp * MaxUp * Vector3.up;
+
+        lastUpdate = currentTime;
+    }
+
+    private void DeltaUp(float delta)
+    {
+        amountUp = Mathf.Clamp(amountUp + delta, 0, 1);
+        //Debug.Log($"delta: {delta}, amountUp: {amountUp}");
+    }
+
+    private void SetProgress(float progress, uint currentTime)
+    {
+        //loopOffset = (int)(progress * LoopTimeMs % (LoopTimeMs + currentTime));
+        loopOffset = (int)(currentTime - progress * LoopTimeMs);
+        //loopOffset = (int)currentTime % LoopTimeMs + (int)(progress * LoopTimeMs);
+    }
+
+    private float GetProgress(uint currentTime)
+    {
+        return ((int)currentTime - loopOffset) % LoopTimeMs / (float)LoopTimeMs; // "uint % int" is not exposed, I love working in Udon
+        //return loopOffset - ((int)currentTime % LoopTimeMs) / (float)LoopTimeMs; // "uint % int" is not exposed, I love working in Udon
+    }
+
+    public void UpButtonPressed()
+    {
+        DeltaUp(UpPerPress);
+        Debug.Log($"({nameof(TestBall)}) Up button pressed, jumped up at {GetProgress(networkManager.CurrentTime)} to {amountUp}.");
+        networkManager.SendEvent((NetworkEventType)1);
+    }
+
+    public void SyncButtonPressed()
+    {
+        networkManager.SendEvent((NetworkEventType)0);
+        Debug.Log($"({nameof(TestBall)}) Sync button pressed, synced at progress {GetProgress(networkManager.CurrentTime)} and amountUp {amountUp}.");
+    }
+
+    public override void AppendSyncedData(byte[][] data, ref int index, NetworkEventType eventType, uint eventTime)
+    {
+        var currentTime = networkManager.CurrentTime;
+
+        if (eventType == 0)
+        {
+            data[index++] = BitConverter.GetBytes(amountUp);
+            data[index++] = BitConverter.GetBytes(GetProgress(currentTime));
+        }
+    }
+
+    public override bool SetSyncedData(byte[] data, ref int index, NetworkEventType eventType, uint eventTime)
+    {
+        var currentTime = networkManager.CurrentTime;
+
+        if (eventType == 0)
+        {
+            amountUp = BitConverter.ToSingle(data, index);
+            SetProgress(BitConverter.ToSingle(data, index + 4), currentTime);
+            Debug.Log($"({nameof(TestBall)}) Received sync event, synced to progress {GetProgress(currentTime)} and amountUp {amountUp}.");
+            index += 8;
+        }
+        else
+        {
+            DeltaUp(UpPerPress);
+            Debug.Log($"({nameof(TestBall)}) Received up event, jumped up at {GetProgress(networkManager.CurrentTime)} to {amountUp}.");
+        }
+
+        return true;
+    }
+
+    public override void SyncedToNewTime(uint oldTime, uint newTime)
+    {
+        lastUpdate += newTime - oldTime;
+    }
+}

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