fix : 포매팅

- 현재 및 개선 단계별 CCU 추정 (현재 30~50명 → Phase 전체 적용 시 5,000명)
- M4 Mac Mini 기준 하드웨어 적합성 분석
- CCU별 네트워크 대역폭 계산 (AOI 적용 후 기준)
- 환경별 (가정용/IDC/클라우드) 현실적 CCU 결론

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

ClientTester/EchoClientTester/EchoDummyService/DummyClientService.cs

@@ -8,6 +8,19 @@ public class DummyClientService
     private readonly List<DummyClients> clients;
     private readonly int sendInterval;
 
+    // 유닛 테스트용 (n패킷 시간체크)
+    public bool IsTest
+    {
+        get;
+        set;
+    } = false;
+
+    public int TestCount
+    {
+        get;
+        set;
+    } = 100000;
+
     // 모든거 강종
     public event Action? OnAllDisconnected;
 
@@ -21,6 +34,16 @@ public class DummyClientService
 
     public async Task RunAsync(CancellationToken ct)
     {
+        if (IsTest)
+        {
+            foreach (DummyClients c in clients)
+            {
+                c.TestCount = TestCount;
+            }
+
+            Log.Information("[TEST] 유닛 테스트 모드: 클라이언트당 {Count}개 수신 시 자동 종료", TestCount);
+        }
+
         await Task.WhenAll(
             PollLoopAsync(ct),
             SendLoopAsync(ct)
@@ -103,6 +126,7 @@ public class DummyClientService
     {
         int totalSent = 0, totalRecv = 0;
         int connected = 0;
+        int rttClientCount = 0;
 
         Log.Information("───────────── Performance Report ─────────────");
 
@@ -120,14 +144,18 @@ public class DummyClientService
 
             totalSent += c.SentCount;
             totalRecv += c.ReceivedCount;
-            totalAvgRtt += c.AvgRttMs;
+            if (c.RttCount > 0)
+            {
+                totalAvgRtt += c.AvgRttMs;
+                rttClientCount++;
+            }
             if (c.peer != null)
             {
                 connected++;
             }
         }
 
-        double avgRtt = connected > 0 ? totalAvgRtt / connected : 0;
+        double avgRtt = rttClientCount > 0 ? totalAvgRtt / rttClientCount : 0;
 
         Log.Information("────────────────────────────────────────────");
         Log.Information(

ClientTester/EchoClientTester/EchoDummyService/DummyClients.cs

@@ -18,6 +18,14 @@ public class DummyClients
     // seq → 송신 타임스탬프 (Stopwatch tick)
     private ConcurrentDictionary<int, long> pendingPings = new();
     private int seqNumber;
+    private const int MaxPendingPings = 1000;
+
+    // 유닛 테스트용 (0 = 제한 없음)
+    public int TestCount
+    {
+        get;
+        set;
+    } = 0;
 
     // 통계
     public int SentCount
@@ -81,6 +89,12 @@ public class DummyClients
             }
 
             ReceivedCount++;
+
+            if (TestCount > 0 && ReceivedCount >= TestCount)
+            {
+                peer.Disconnect();
+            }
+
             reader.Recycle();
         };
 
@@ -104,9 +118,20 @@ public class DummyClients
         int seq = seqNumber++;
         pendingPings[seq] = Stopwatch.GetTimestamp();
 
+        // 응답 없는 오래된 ping 정리 (패킷 유실 시 메모리 누수 방지)
+        if (pendingPings.Count > MaxPendingPings)
+        {
+            int cutoff = seq - MaxPendingPings;
+            foreach (int key in pendingPings.Keys)
+            {
+                if (key < cutoff)
+                    pendingPings.TryRemove(key, out _);
+            }
+        }
+
         PacketHeader packetHeader = new PacketHeader();
         packetHeader.Code = 0;
-        packetHeader.BodyLength = $"seq:{seq}".Length;
+        packetHeader.BodyLength = $"Echo seq:{seq}".Length;
         writer.Put((short)packetHeader.Code);
         writer.Put((short)packetHeader.BodyLength);
         writer.Put($"Echo seq:{seq}");

ClientTester/EchoClientTester/Packet/PacketSerializer.cs

@@ -7,22 +7,21 @@ namespace ClientTester.Packet
 
     public static class PacketSerializer
     {
-        // 직렬화: 객체 → byte[]
-        public static byte[] Serialize<T>(ushort type, ushort size, T packet)
+        // 직렬화: 객체 → byte[] (size는 payload 크기로 자동 계산)
+        public static byte[] Serialize<T>(ushort type, T packet)
         {
-            MemoryStream ms = new MemoryStream();
+            using MemoryStream payloadMs = new MemoryStream();
+            Serializer.Serialize(payloadMs, packet);
+            byte[] payload = payloadMs.ToArray();
+            ushort size = (ushort)payload.Length;
 
-            // 2바이트 패킷 타입 헤더
-            ms.WriteByte((byte)(type & 0xFF));
-            ms.WriteByte((byte)(type >> 8));
-
-            // 2바이트 패킷 길이 헤더
-            ms.WriteByte((byte)(size & 0xFF));
-            ms.WriteByte((byte)(size >> 8));
-
-            // protobuf 페이로드
-            Serializer.Serialize(ms, packet);
-            return ms.ToArray();
+            byte[] result = new byte[4 + payload.Length];
+            result[0] = (byte)(type & 0xFF);
+            result[1] = (byte)(type >> 8);
+            result[2] = (byte)(size & 0xFF);
+            result[3] = (byte)(size >> 8);
+            Buffer.BlockCopy(payload, 0, result, 4, payload.Length);
+            return result;
         }
 
         // 역직렬화: byte[] → (PacketType, payload bytes)
@@ -34,19 +33,25 @@ namespace ClientTester.Packet
                 return (0, 0, null)!;
             }
 
-            // 길이체크도 필요함
-
             ushort type = (ushort)(data[0] | (data[1] << 8));
             ushort size = (ushort)(data[2] | (data[3] << 8));
-            byte[] payload = new byte[data.Length - 4];
-            Buffer.BlockCopy(data, 4, payload, 0, payload.Length);
+
+            int actualPayloadLen = data.Length - 4;
+            if (size > actualPayloadLen)
+            {
+                Log.Warning("[PacketSerializer] 페이로드 크기 불일치 HeaderSize={Size} ActualSize={Actual}", size, actualPayloadLen);
+                return (0, 0, null)!;
+            }
+
+            byte[] payload = new byte[size];
+            Buffer.BlockCopy(data, 4, payload, 0, size);
             return (type, size, payload);
         }
 
         // 페이로드 → 특정 타입으로 역직렬화
         public static T DeserializePayload<T>(byte[] payload)
         {
-            MemoryStream ms = new MemoryStream(payload);
+            using MemoryStream ms = new MemoryStream(payload);
             return Serializer.Deserialize<T>(ms);
         }
     }

ClientTester/EchoClientTester/Program.cs

@@ -3,7 +3,7 @@ using Serilog;
 
 class EcoClientTester
 {
-    public static readonly string SERVER_IP = "localhost";
+    public static readonly string SERVER_IP = "tolelom.xyz";
     public static readonly int SERVER_PORT = 9500;
     public static readonly string CONNECTION_KEY = "test";
     public static readonly int CLIENT_COUNT = 100;
@@ -29,12 +29,14 @@ class EcoClientTester
         };
 
         DummyClientService service = new DummyClientService(CLIENT_COUNT, SERVER_IP, SERVER_PORT, CONNECTION_KEY, 100);
-        service.OnAllDisconnected += async () =>
+        service.OnAllDisconnected += () =>
         {
             Log.Warning("[SHUTDOWN] 종료 이벤트 발생, 종료 중...");
-            await cts.CancelAsync();
+            cts.Cancel();
         };
 
+        // service.IsTest = true;
+        // service.TestCount = 100;
         await service.RunAsync(cts.Token);
 
         service.PrintStats();

MMOTestServer/MMOserver/Game/Channel/Channel.cs

@@ -0,0 +1,82 @@
+using MMOserver.Game.Channel.Maps;
+
+namespace MMOserver.Game.Channel;
+
+public class Channel
+{
+    // 로비
+    private Robby robby = new Robby();
+
+    // 채널 내 유저 상태 (hashKey → Player)
+    private Dictionary<long, Player> connectUsers = new Dictionary<long, Player>();
+
+    public int ChannelId
+    {
+        get;
+        private set;
+    }
+
+    public int UserCount
+    {
+        get;
+        private set;
+    }
+
+    public int UserCountMax
+    {
+        get;
+        private set;
+    } = 100;
+
+    public Channel(int channelId)
+    {
+        ChannelId = channelId;
+    }
+
+    public void AddUser(long userId, Player player)
+    {
+        connectUsers[userId] = player;
+        UserCount++;
+    }
+
+    public void RemoveUser(long userId)
+    {
+        connectUsers.Remove(userId);
+        UserCount--;
+    }
+
+    // 채널 내 모든 유저의 hashKey 반환
+    public IEnumerable<long> GetConnectUsers()
+    {
+        return connectUsers.Keys;
+    }
+
+    // 채널 내 모든 Player 반환
+    public IEnumerable<Player> GetPlayers()
+    {
+        return connectUsers.Values;
+    }
+
+    // 특정 유저의 Player 반환
+    public Player? GetPlayer(long userId)
+    {
+        connectUsers.TryGetValue(userId, out Player? player);
+        return player;
+    }
+
+    public int HasUser(long userId)
+    {
+        if (connectUsers.ContainsKey(userId))
+        {
+            return ChannelId;
+        }
+
+        return -1;
+    }
+
+    // 로비 가져옴
+    public Robby GetRobby()
+    {
+        return robby;
+    }
+}

MMOTestServer/MMOserver/Game/Channel/ChannelManager.cs

@@ -0,0 +1,84 @@
+namespace MMOserver.Game.Channel;
+
+public class ChannelManager
+{
+    // 일단은 채널은 서버 켤때 고정으로간다 1개
+    public static ChannelManager Instance
+    {
+        get;
+    } = new ChannelManager();
+
+    // 채널 관리
+    private List<Channel> channels = new List<Channel>();
+
+    // 채널별 유저 관리 (유저 key, 채널 val)
+    private Dictionary<long, int> connectUsers = new Dictionary<long, int>();
+
+    public ChannelManager()
+    {
+        Initializer();
+    }
+
+    public void Initializer(int channelSize = 1)
+    {
+        for (int i = 0; i < channelSize; i++)
+        {
+            channels.Add(new Channel(i));
+        }
+    }
+
+    public Channel GetChannel(int channelId)
+    {
+        return channels[channelId];
+    }
+
+    public List<Channel> GetChannels()
+    {
+        return channels;
+    }
+
+    public void AddUser(int channelId, long userId, Player player)
+    {
+        // 유저 추가
+        connectUsers[userId] = channelId;
+        // 채널에 유저 추가
+        channels[channelId].AddUser(userId, player);
+    }
+
+    public bool RemoveUser(long userId)
+    {
+        // 채널 있으면
+        int channelId = connectUsers[userId];
+
+        // 날린다.
+        if (channelId >= 0)
+        {
+            channels[channelId].RemoveUser(userId);
+            connectUsers.Remove(userId);
+            return true;
+        }
+
+        return false;
+    }
+
+    public int HasUser(long userId)
+    {
+        int channelId = -1;
+        if (connectUsers.ContainsKey(userId))
+        {
+            channelId = connectUsers[userId];
+        }
+
+        if (channelId != -1)
+        {
+            return channels[channelId].HasUser(userId);
+        }
+
+        return channelId;
+    }
+
+    public Dictionary<long, int> GetConnectUsers()
+    {
+        return connectUsers;
+    }
+}

MMOTestServer/MMOserver/Game/Channel/Maps/Robby.cs

@@ -0,0 +1,17 @@
+using MMOserver.Game.Engine;
+
+namespace MMOserver.Game.Channel.Maps;
+
+public class Robby
+{
+    // 마을 시작 지점 넣어 둔다.
+    public static Vector3 StartPosition
+    {
+        get;
+        set;
+    } = new Vector3(0, 0, 0);
+
+    public Robby()
+    {
+    }
+}

MMOTestServer/MMOserver/Game/Engine/Vector3.cs

@@ -0,0 +1,36 @@
+namespace MMOserver.Game.Engine;
+
+public class Vector3
+{
+    public int X
+    {
+        get;
+        set;
+    }
+
+    public int Y
+    {
+        get;
+        set;
+    }
+
+    public int Z
+    {
+        get;
+        set;
+    }
+
+    public Vector3()
+    {
+        X = 0;
+        Y = 0;
+        Z = 0;
+    }
+
+    public Vector3(int x, int y, int z)
+    {
+        X = x;
+        Y = y; // 수직 사실상 안쓰겠다.
+        Z = z;
+    }
+}

MMOTestServer/MMOserver/Game/GameServer.cs

@@ -1,27 +1,303 @@
-using LiteNetLib;
+using LiteNetLib;
+using MMOserver.Game.Channel;
+using MMOserver.Packet;
+using ProtoBuf;
+using Serilog;
+using ServerLib.Packet;
 using ServerLib.Service;
 
 namespace MMOserver.Game;
 
 public class GameServer : ServerBase
 {
+    private readonly Dictionary<ushort, Action<NetPeer, long, byte[]>> packetHandlers;
+
     public GameServer(int port, string connectionString) : base(port, connectionString)
     {
-
+        packetHandlers = new Dictionary<ushort, Action<NetPeer, long, byte[]>>
+        {
+            [(ushort)PacketCode.INTO_CHANNEL] = OnIntoChannel,
+            [(ushort)PacketCode.EXIT_CHANNEL] = OnExitChannel,
+            [(ushort)PacketCode.TRANSFORM_PLAYER] = OnTransformPlayer,
+            [(ushort)PacketCode.ACTION_PLAYER] = OnActionPlayer,
+            [(ushort)PacketCode.STATE_PLAYER] = OnStatePlayer,
+        };
     }
 
     protected override void OnSessionConnected(NetPeer peer, long hashKey)
     {
-        throw new NotImplementedException();
+        Log.Information("[GameServer] 세션 연결 HashKey={Key} PeerId={Id}", hashKey, peer.Id);
+
+        // 만약 wifi-lte 로 바꿔졌다 이때 이미 로비에 들어가 있다면 넘긴다.
+        ChannelManager cm = ChannelManager.Instance;
+        int channelId = cm.HasUser(hashKey);
+
+        if (channelId >= 0)
+        {
+            // 재연결: 채널 유저 목록 전송 (채널 선택 스킵, 바로 마을로)
+            SendIntoChannelPacket(peer, hashKey);
+        }
+        else
+        {
+            // 모든 채널 정보 던진다
+            SendLoadChannelPacket(peer, hashKey);
+        }
     }
 
     protected override void OnSessionDisconnected(NetPeer peer, long hashKey, DisconnectInfo info)
     {
-        throw new NotImplementedException();
+        ChannelManager cm = ChannelManager.Instance;
+        if (cm.RemoveUser(hashKey))
+        {
+            Log.Information("[GameServer] 세션 해제 HashKey={Key} Reason={Reason}", hashKey, info.Reason);
+        }
     }
 
     protected override void HandlePacket(NetPeer peer, long hashKey, ushort type, byte[] payload)
     {
-        throw new NotImplementedException();
+        if (packetHandlers.TryGetValue(type, out Action<NetPeer, long, byte[]>? handler))
+        {
+            handler(peer, hashKey, payload);
+        }
+        else
+        {
+            Log.Warning("[GameServer] 알 수 없는 패킷 Type={Type}", type);
+        }
+    }
+
+    // ============================================================
+    // 보내는 패킷
+    // ============================================================
+
+    private void SendLoadChannelPacket(NetPeer peer, long hashKey)
+    {
+        LoadChannelPacket loadChannelPacket = new LoadChannelPacket();
+        foreach (Channel.Channel channel in ChannelManager.Instance.GetChannels())
+        {
+            ChannelInfo info = new ChannelInfo();
+            info.ChannelId = channel.ChannelId;
+            info.ChannelUserConut = channel.UserCount;
+            info.ChannelUserMax = channel.UserCountMax;
+            loadChannelPacket.Channels.Add(info);
+        }
+
+        byte[] data = PacketSerializer.Serialize<LoadChannelPacket>((ushort)PacketCode.LOAD_CHANNEL, loadChannelPacket);
+        SendTo(peer, data);
+    }
+
+    // 나간 유저를 같은 채널 유저들에게 알림 (UPDATE_CHANNEL_USER IsAdd=false)
+    private void SendExitChannelPacket(NetPeer peer, long hashKey, int channelId, Player player)
+    {
+        UpdateChannelUserPacket packet = new UpdateChannelUserPacket
+        {
+            Players = ToPlayerInfo(player),
+            IsAdd = false
+        };
+        byte[] data = PacketSerializer.Serialize<UpdateChannelUserPacket>((ushort)PacketCode.UPDATE_CHANNEL_USER, packet);
+        // 이미 채널에서 제거된 후라 나간 본인에게는 전송되지 않음
+        BroadcastToChannel(channelId, data);
+    }
+
+    // 채널 입장 시 패킷 전송
+    //  - 새 유저에게 : 기존 채널 유저 목록 (INTO_CHANNEL)
+    //  - 기존 유저들에게 : 새 유저 입장 알림 (UPDATE_CHANNEL_USER IsAdd=true)
+    private void SendIntoChannelPacket(NetPeer peer, long hashKey)
+    {
+        ChannelManager cm = ChannelManager.Instance;
+        int channelId = cm.HasUser(hashKey);
+        if (channelId < 0)
+        {
+            return;
+        }
+
+        Channel.Channel channel = cm.GetChannel(channelId);
+        Player? myPlayer = channel.GetPlayer(hashKey);
+
+        // 1. 새 유저에게: 자신을 제외한 기존 채널 유저 목록 전송
+        IntoChannelPacket response = new IntoChannelPacket { ChannelId = channelId };
+        foreach (long userId in channel.GetConnectUsers())
+        {
+            if (userId == hashKey)
+            {
+                continue;
+            }
+
+            Player? p = channel.GetPlayer(userId);
+            if (p != null)
+            {
+                response.Players.Add(ToPlayerInfo(p));
+            }
+        }
+
+        byte[] toNewUser = PacketSerializer.Serialize<IntoChannelPacket>((ushort)PacketCode.INTO_CHANNEL, response);
+        SendTo(peer, toNewUser);
+
+        // 2. 기존 유저들에게: 새 유저 입장 알림
+        if (myPlayer != null)
+        {
+            UpdateChannelUserPacket notify = new UpdateChannelUserPacket
+            {
+                Players = ToPlayerInfo(myPlayer),
+                IsAdd = true
+            };
+            byte[] toOthers = PacketSerializer.Serialize<UpdateChannelUserPacket>((ushort)PacketCode.UPDATE_CHANNEL_USER, notify);
+            BroadcastToChannel(channelId, toOthers, peer);
+        }
+    }
+
+    // ============================================================
+    // 채널 브로드캐스트 헬퍼
+    // ============================================================
+
+    // 특정 채널의 모든 유저에게 전송 (exclude 지정 시 해당 피어 제외)
+    private void BroadcastToChannel(int channelId, byte[] data, NetPeer? exclude = null)
+    {
+        Channel.Channel channel = ChannelManager.Instance.GetChannel(channelId);
+        foreach (long userId in channel.GetConnectUsers())
+        {
+            if (!sessions.TryGetValue(userId, out NetPeer? targetPeer))
+            {
+                continue;
+            }
+
+            if (exclude != null && targetPeer.Id == exclude.Id)
+            {
+                continue;
+            }
+
+            SendTo(targetPeer, data);
+        }
+    }
+
+    // ============================================================
+    // Player ↔ PlayerInfo 변환 (패킷 전송 시에만 사용)
+    // ============================================================
+
+    private static PlayerInfo ToPlayerInfo(Player player)
+    {
+        return new PlayerInfo
+        {
+            PlayerId = player.PlayerId,
+            Nickname = player.Nickname,
+            Level = player.Level,
+            Hp = player.Hp,
+            MaxHp = player.MaxHp,
+            Mp = player.Mp,
+            MaxMp = player.MaxMp,
+            Position = new Vector3 { X = player.PosX, Y = player.PosY, Z = player.PosZ },
+            RotY = player.RotY,
+        };
+    }
+
+    // ============================================================
+    // 패킷 핸들러
+    // ============================================================
+
+    private void OnIntoChannel(NetPeer peer, long hashKey, byte[] payload)
+    {
+        IntoChannelPacket packet = Serializer.Deserialize<IntoChannelPacket>(new ReadOnlyMemory<byte>(payload));
+
+        ChannelManager cm = ChannelManager.Instance;
+
+        // TODO: 실제 서비스에서는 DB/세션에서 플레이어 정보 로드 필요
+        Player newPlayer = new Player
+        {
+            HashKey = hashKey,
+            PlayerId = (int)(hashKey & 0x7FFFFFFF),
+        };
+
+        cm.AddUser(packet.ChannelId, hashKey, newPlayer);
+        Log.Debug("[GameServer] INTO_CHANNEL HashKey={Key} ChannelId={ChannelId}", hashKey, packet.ChannelId);
+
+        // 접속된 모든 유저 정보 전달
+        SendIntoChannelPacket(peer, hashKey);
+    }
+
+    private void OnExitChannel(NetPeer peer, long hashKey, byte[] payload)
+    {
+        ExitChannelPacket packet = Serializer.Deserialize<ExitChannelPacket>(new ReadOnlyMemory<byte>(payload));
+
+        ChannelManager cm = ChannelManager.Instance;
+
+        // 제거 전에 채널/플레이어 정보 저장 (브로드캐스트에 필요)
+        int channelId = cm.HasUser(hashKey);
+        Player? player = channelId >= 0 ? cm.GetChannel(channelId).GetPlayer(hashKey) : null;
+
+        cm.RemoveUser(hashKey);
+        Log.Debug("[GameServer] EXIT_CHANNEL HashKey={Key} PlayerId={PlayerId}", hashKey, packet.PlayerId);
+
+        // 같은 채널 유저들에게 나갔다고 알림
+        if (channelId >= 0 && player != null)
+        {
+            SendExitChannelPacket(peer, hashKey, channelId, player);
+        }
+    }
+
+    private void OnTransformPlayer(NetPeer peer, long hashKey, byte[] payload)
+    {
+        TransformPlayerPacket packet = Serializer.Deserialize<TransformPlayerPacket>(new ReadOnlyMemory<byte>(payload));
+
+        ChannelManager cm = ChannelManager.Instance;
+        int channelId = cm.HasUser(hashKey);
+        if (channelId < 0)
+        {
+            return;
+        }
+
+        // 채널 내 플레이어 위치/방향 상태 갱신
+        Player? player = cm.GetChannel(channelId).GetPlayer(hashKey);
+        if (player != null)
+        {
+            player.PosX = packet.Position.X;
+            player.PosY = packet.Position.Y;
+            player.PosZ = packet.Position.Z;
+            player.RotY = packet.RotY;
+        }
+
+        // 같은 채널 유저들에게 위치/방향 브로드캐스트 (나 제외)
+        byte[] data = PacketSerializer.Serialize<TransformPlayerPacket>((ushort)PacketCode.TRANSFORM_PLAYER, packet);
+        BroadcastToChannel(channelId, data, peer);
+    }
+
+    private void OnActionPlayer(NetPeer peer, long hashKey, byte[] payload)
+    {
+        ActionPlayerPacket packet = Serializer.Deserialize<ActionPlayerPacket>(new ReadOnlyMemory<byte>(payload));
+
+        ChannelManager cm = ChannelManager.Instance;
+        int channelId = cm.HasUser(hashKey);
+        if (channelId < 0)
+        {
+            return;
+        }
+
+        // 같은 채널 유저들에게 행동 브로드캐스트 (나 제외)
+        byte[] data = PacketSerializer.Serialize<ActionPlayerPacket>((ushort)PacketCode.ACTION_PLAYER, packet);
+        BroadcastToChannel(channelId, data, peer);
+    }
+
+    private void OnStatePlayer(NetPeer peer, long hashKey, byte[] payload)
+    {
+        StatePlayerPacket packet = Serializer.Deserialize<StatePlayerPacket>(new ReadOnlyMemory<byte>(payload));
+
+        ChannelManager cm = ChannelManager.Instance;
+        int channelId = cm.HasUser(hashKey);
+        if (channelId < 0)
+        {
+            return;
+        }
+
+        // 채널 내 플레이어 HP/MP 상태 갱신
+        Player? player = cm.GetChannel(channelId).GetPlayer(hashKey);
+        if (player != null)
+        {
+            player.Hp = packet.Hp;
+            player.MaxHp = packet.MaxHp;
+            player.Mp = packet.Mp;
+            player.MaxMp = packet.MaxMp;
+        }
+
+        // 같은 채널 유저들에게 스테이트 브로드캐스트 (나 제외)
+        byte[] data = PacketSerializer.Serialize<StatePlayerPacket>((ushort)PacketCode.STATE_PLAYER, packet);
+        BroadcastToChannel(channelId, data, peer);
     }
 }

MMOTestServer/MMOserver/Game/Player.cs

@@ -0,0 +1,77 @@
+namespace MMOserver.Game;
+
+public class Player
+{
+    public long HashKey
+    {
+        get;
+        set;
+    }
+
+    public int PlayerId
+    {
+        get;
+        set;
+    }
+
+    public string Nickname
+    {
+        get;
+        set;
+    } = string.Empty;
+
+    public int Level
+    {
+        get;
+        set;
+    }
+
+    public int Hp
+    {
+        get;
+        set;
+    }
+
+    public int MaxHp
+    {
+        get;
+        set;
+    }
+
+    public int Mp
+    {
+        get;
+        set;
+    }
+
+    public int MaxMp
+    {
+        get;
+        set;
+    }
+
+    // 위치/방향 (클라이언트 패킷과 동일하게 float)
+    public float PosX
+    {
+        get;
+        set;
+    }
+
+    public float PosY
+    {
+        get;
+        set;
+    }
+
+    public float PosZ
+    {
+        get;
+        set;
+    }
+
+    public float RotY
+    {
+        get;
+        set;
+    }
+}

MMOTestServer/MMOserver/Packet/PacketBody.cs

@@ -100,24 +100,6 @@ public class PlayerInfo
     }
 }
 
-[ProtoContract]
-public class ItemInfo
-{
-    [ProtoMember(1)]
-    public int ItemId
-    {
-        get;
-        set;
-    }
-
-    [ProtoMember(2)]
-    public int Count
-    {
-        get;
-        set;
-    }
-}
-
 // ============================================================
 // 인증
 // ============================================================
@@ -134,7 +116,7 @@ public class RecvTokenPacket
     }
 }
 
-// LOAD_GAME
+// LOAD_GAME 내 정보
 [ProtoContract]
 public class LoadGamePacket
 {
@@ -151,27 +133,96 @@ public class LoadGamePacket
         get;
         set;
     }
+
+    [ProtoMember(3)]
+    public int MaplId
+    {
+        get;
+        set;
+    }
 }
 
 // ============================================================
 // 로비
 // ============================================================
 
-// INTO_LOBBY
 [ProtoContract]
-public class IntoLobbyPacket
+public class ChannelInfo
 {
     [ProtoMember(1)]
+    public int ChannelId
+    {
+        get;
+        set;
+    }
+
+    [ProtoMember(2)]
+    public int ChannelUserConut
+    {
+        get;
+        set;
+    }
+
+    [ProtoMember(3)]
+    public int ChannelUserMax
+    {
+        get;
+        set;
+    }
+}
+
+[ProtoContract]
+public class LoadChannelPacket
+{
+    [ProtoMember(1)]
+    public List<ChannelInfo> Channels
+    {
+        get;
+        set;
+    } = new List<ChannelInfo>();
+}
+
+// INTO_CHANNEL 클라->서버: 입장할 채널 ID / 서버->클라: 채널 내 나 이외 플레이어 목록
+[ProtoContract]
+public class IntoChannelPacket
+{
+    [ProtoMember(1)]
+    public int ChannelId
+    {
+        get;
+        set;
+    } // 클라->서버: 입장할 채널 ID
+
+    [ProtoMember(2)]
     public List<PlayerInfo> Players
+    {
+        get;
+        set;
+    } = new List<PlayerInfo>(); // 서버->클라: 채널 내 플레이어 목록
+}
+
+// UPDATE_CHANNEL_USER 유저 접속/나감
+[ProtoContract]
+public class UpdateChannelUserPacket
+{
+    [ProtoMember(1)]
+    public PlayerInfo Players
+    {
+        get;
+        set;
+    }
+
+    [ProtoMember(2)]
+    public bool IsAdd
     {
         get;
         set;
     }
 }
 
-// EXIT_LOBBY
+// EXIT_CHANNEL 나가는 유저
 [ProtoContract]
-public class ExitLobbyPacket
+public class ExitChannelPacket
 {
     [ProtoMember(1)]
     public int PlayerId
@@ -181,174 +232,6 @@ public class ExitLobbyPacket
     }
 }
 
-// ============================================================
-// 인스턴스 던전
-// ============================================================
-
-public enum BossState
-{
-    START,
-    END,
-    PHASE_CHANGE
-}
-
-public enum BossResult
-{
-    SUCCESS,
-    FAIL
-}
-
-// INTO_INSTANCE
-[ProtoContract]
-public class IntoInstancePacket
-{
-    [ProtoMember(1)]
-    public int InstanceId
-    {
-        get;
-        set;
-    }
-
-    [ProtoMember(2)]
-    public int BossId
-    {
-        get;
-        set;
-    }
-
-    [ProtoMember(3)]
-    public List<int> PlayerIds
-    {
-        get;
-        set;
-    }
-}
-
-// UPDATE_BOSS
-[ProtoContract]
-public class UpdateBossPacket
-{
-    [ProtoMember(1)]
-    public BossState State
-    {
-        get;
-        set;
-    }
-
-    [ProtoMember(2)]
-    public int Phase
-    {
-        get;
-        set;
-    }
-
-    [ProtoMember(3)]
-    public BossResult Result
-    {
-        get;
-        set;
-    } // END일 때만 유효
-}
-
-// REWARD_INSTANCE
-[ProtoContract]
-public class RewardInstancePacket
-{
-    [ProtoMember(1)]
-    public int Exp
-    {
-        get;
-        set;
-    }
-
-    [ProtoMember(2)]
-    public List<ItemInfo> Items
-    {
-        get;
-        set;
-    }
-}
-
-// EXIT_INSTANCE
-[ProtoContract]
-public class ExitInstancePacket
-{
-    [ProtoMember(1)]
-    public int PlayerId
-    {
-        get;
-        set;
-    }
-}
-
-// ============================================================
-// 파티
-// ============================================================
-
-public enum PartyUpdateType
-{
-    CREATE,
-    DELETE
-}
-
-public enum UserPartyUpdateType
-{
-    JOIN,
-    LEAVE
-}
-
-// UPDATE_PARTY
-[ProtoContract]
-public class UpdatePartyPacket
-{
-    [ProtoMember(1)]
-    public int PartyId
-    {
-        get;
-        set;
-    }
-
-    [ProtoMember(2)]
-    public PartyUpdateType Type
-    {
-        get;
-        set;
-    }
-
-    [ProtoMember(3)]
-    public int LeaderId
-    {
-        get;
-        set;
-    }
-}
-
-// UPDATE_USER_PARTY
-[ProtoContract]
-public class UpdateUserPartyPacket
-{
-    [ProtoMember(1)]
-    public int PartyId
-    {
-        get;
-        set;
-    }
-
-    [ProtoMember(2)]
-    public int PlayerId
-    {
-        get;
-        set;
-    }
-
-    [ProtoMember(3)]
-    public UserPartyUpdateType Type
-    {
-        get;
-        set;
-    }
-}
-
 // ============================================================
 // 플레이어
 // ============================================================
@@ -604,3 +487,71 @@ public class DamagePacket
         set;
     }
 }
+
+// ============================================================
+// 파티
+// ============================================================
+
+public enum PartyUpdateType
+{
+    CREATE,
+    DELETE
+}
+
+public enum UserPartyUpdateType
+{
+    JOIN,
+    LEAVE
+}
+
+// UPDATE_PARTY
+[ProtoContract]
+public class UpdatePartyPacket
+{
+    [ProtoMember(1)]
+    public int PartyId
+    {
+        get;
+        set;
+    }
+
+    [ProtoMember(2)]
+    public PartyUpdateType Type
+    {
+        get;
+        set;
+    }
+
+    [ProtoMember(3)]
+    public int LeaderId
+    {
+        get;
+        set;
+    }
+}
+
+// UPDATE_USER_PARTY
+[ProtoContract]
+public class UpdateUserPartyPacket
+{
+    [ProtoMember(1)]
+    public int PartyId
+    {
+        get;
+        set;
+    }
+
+    [ProtoMember(2)]
+    public int PlayerId
+    {
+        get;
+        set;
+    }
+
+    [ProtoMember(3)]
+    public UserPartyUpdateType Type
+    {
+        get;
+        set;
+    }
+}

MMOTestServer/MMOserver/Packet/PacketHeader.cs

@@ -1,61 +1,56 @@
 namespace MMOserver.Packet;
 
-public enum PacketCode : short
+public enum PacketCode : ushort
 {
-    NONE,
     // 초기 클라이언트 시작시 jwt토큰 받아옴
     RECV_TOKEN,
-    // jwt토큰 검증후 게임에 들어갈지 말지 (내 데이터도 전송)
+
+    // 내 정보 로드 (서버 -> 클라)
     LOAD_GAME,
 
-    // 마을(로비)진입시 모든 데이터 로드
-    INTO_LOBBY,
+    // 모든 채널 로드 - jwt토큰 검증후 게임에 들어갈지 말지 (내 데이터도 전송)
+    // (서버 -> 클라)
+    LOAD_CHANNEL,
 
-    // 로비 나가기
-    EXIT_LOBBY,
+    // 나 채널 접속 (클라 -> 서버)
+    INTO_CHANNEL,
 
-    // 인스턴스 던전 입장
-    INTO_INSTANCE,
+    // 새로운 유저 채널 접속 (서버 -> 클라) / 유저 채널 나감 (서버 -> 클라)
+    UPDATE_CHANNEL_USER,
 
-    // 결과 보상
-    REWARD_INSTANCE,
+    // 채널 나가기 (클라 -> 서버)
+    EXIT_CHANNEL,
 
-    // 보스전 (시작, 종료)
-    UPDATE_BOSS,
+    // 플레이어 위치, 방향 (서버 -> 클라 \ 클라 -> 서버)
+    TRANSFORM_PLAYER,
 
-    // 인스턴스 던전 퇴장
-    EXIT_INSTANCE,
+    // 플레이어 행동 업데이트 (서버 -> 클라 \ 클라 -> 서버)
+    ACTION_PLAYER,
+
+    // 플레이어 스테이트 업데이트 (서버 -> 클라 \ 클라 -> 서버)
+    STATE_PLAYER,
+
+    // NPC 위치, 방향 (서버 -> 클라)
+    TRANSFORM_NPC,
+
+    // NPC 행동 업데이트 (서버 -> 클라)
+    ACTION_NPC,
+
+    // NPC 스테이트 업데이트 (서버 -> 클라)
+    STATE_NPC,
+
+    // 데미지 UI 전달 (서버 -> 클라)
+    DAMAGE,
 
     // 파티 (생성, 삭제)
     UPDATE_PARTY,
 
     // 파티 유저 업데이트(추가 삭제)
-    UPDATE_USER_PARTY,
-
-    // 플레이어 위치, 방향
-    TRANSFORM_PLAYER,
-
-    // 플레이어 행동 업데이트
-    ACTION_PLAYER,
-
-    // 플레이어 스테이트 업데이트
-    STATE_PLAYER,
-
-    // NPC 위치, 방향
-    TRANSFORM_NPC,
-
-    // NPC 행동 업데이트
-    ACTION_NPC,
-
-    // NPC 스테이트 업데이트
-    STATE_NPC,
-
-    // 데미지 UI 전달
-    DAMAGE
+    UPDATE_USER_PARTY
 }
 
 public class PacketHeader
 {
     public PacketCode Code;
-    public int BodyLength;
+    public ushort BodyLength;
 }

MMOTestServer/MMOserver/RDB/Handlers/TestHandlers.cs

@@ -12,37 +12,79 @@ public class TestHandler
 
     public async Task<string> GetTestAsync(int id)
     {
-        Test? result = await _testService.GetTestAsync(id);
-        return result is null
-            ? HandlerHelper.Error("Test not found")
-            : HandlerHelper.Success(result);
+        try
+        {
+            Test? result = await _testService.GetTestAsync(id);
+            return result is null
+                ? HandlerHelper.Error("Test not found")
+                : HandlerHelper.Success(result);
+        }
+        catch (Exception ex)
+        {
+            return HandlerHelper.Error(ex.Message);
+        }
     }
 
     public async Task<string> GetTestByUuidAsync(string uuid)
     {
-        Test? result = await _testService.GetTestByUuidAsync(uuid);
-        return result is null
-            ? HandlerHelper.Error("Test not found")
-            : HandlerHelper.Success(result);
+        try
+        {
+            Test? result = await _testService.GetTestByUuidAsync(uuid);
+            return result is null
+                ? HandlerHelper.Error("Test not found")
+                : HandlerHelper.Success(result);
+        }
+        catch (Exception ex)
+        {
+            return HandlerHelper.Error(ex.Message);
+        }
     }
 
     public async Task<string> GetAllTestsAsync()
     {
-        return HandlerHelper.Success(await _testService.GetAllTestsAsync());
+        try
+        {
+            return HandlerHelper.Success(await _testService.GetAllTestsAsync());
+        }
+        catch (Exception ex)
+        {
+            return HandlerHelper.Error(ex.Message);
+        }
     }
 
     public async Task<string> CreateTestAsync(int testA, string testB, double testC)
     {
-        return HandlerHelper.Success(await _testService.CreateTestAsync(testA, testB, testC));
+        try
+        {
+            return HandlerHelper.Success(await _testService.CreateTestAsync(testA, testB, testC));
+        }
+        catch (Exception ex)
+        {
+            return HandlerHelper.Error(ex.Message);
+        }
     }
 
     public async Task<string> UpdateTestAsync(int id, int? testA, string? testB, double? testC)
     {
-        return HandlerHelper.Success(await _testService.UpdateTestAsync(id, testA, testB, testC));
+        try
+        {
+            return HandlerHelper.Success(await _testService.UpdateTestAsync(id, testA, testB, testC));
+        }
+        catch (Exception ex)
+        {
+            return HandlerHelper.Error(ex.Message);
+        }
     }
 
     public async Task<string> DeleteTestAsync(int id)
     {
-        return HandlerHelper.Success(await _testService.DeleteTestAsync(id));
+        try
+        {
+            return HandlerHelper.Success(await _testService.DeleteTestAsync(id));
+        }
+        catch (Exception ex)
+        {
+            return HandlerHelper.Error(ex.Message);
+        }
     }
 }

MMOTestServer/MMOserver/RDB/Repositories/TestRepository.cs

@@ -7,7 +7,7 @@ namespace MMOserver.RDB.Repositories;
 // 실제 호출할 쿼리들
 public class TestRepository : ARepository<Test>
 {
-    public TestRepository(DbConnectionFactory factory) : base(factory)
+    public TestRepository(IDbConnectionFactory factory) : base(factory)
     {
     }
 

MMOTestServer/ServerLib/Packet/PacketSerializer.cs

@@ -9,22 +9,24 @@ namespace ServerLib.Packet
 
     public static class PacketSerializer
     {
-        // 직렬화: 객체 → byte[]
-        public static byte[] Serialize<T>(ushort type, ushort size, T packet)
+        // 직렬화: 객체 → byte[] (size는 payload 크기로 자동 계산)
+        public static byte[] Serialize<T>(ushort type, T packet)
         {
-            MemoryStream ms = new MemoryStream();
+            using MemoryStream payloadMs = new MemoryStream();
+            Serializer.Serialize(payloadMs, packet);
+            byte[] payload = payloadMs.ToArray();
+            ushort size = (ushort)payload.Length;
 
+            byte[] result = new byte[4 + payload.Length];
             // 2바이트 패킷 타입 헤더
-            ms.WriteByte((byte)(type & 0xFF));
-            ms.WriteByte((byte)(type >> 8));
-
+            result[0] = (byte)(type & 0xFF);
+            result[1] = (byte)(type >> 8);
             // 2바이트 패킷 길이 헤더
-            ms.WriteByte((byte)(size & 0xFF));
-            ms.WriteByte((byte)(size >> 8));
-
+            result[2] = (byte)(size & 0xFF);
+            result[3] = (byte)(size >> 8);
             // protobuf 페이로드
-            Serializer.Serialize(ms, packet);
-            return ms.ToArray();
+            Buffer.BlockCopy(payload, 0, result, 4, payload.Length);
+            return result;
         }
 
         // 역직렬화: byte[] → (PacketType, payload bytes)
@@ -36,19 +38,26 @@ namespace ServerLib.Packet
                 return (0, 0, null)!;
             }
 
-            // 길이체크도 필요함
-
             ushort type = (ushort)(data[0] | (data[1] << 8));
             ushort size = (ushort)(data[2] | (data[3] << 8));
-            byte[] payload = new byte[data.Length - 4];
-            Buffer.BlockCopy(data, 4, payload, 0, payload.Length);
+
+            // 헤더에 명시된 size와 실제 데이터 길이 검증
+            int actualPayloadLen = data.Length - 4;
+            if (size > actualPayloadLen)
+            {
+                Log.Warning("[PacketSerializer] 페이로드 크기 불일치 HeaderSize={Size} ActualSize={Actual}", size, actualPayloadLen);
+                return (0, 0, null)!;
+            }
+
+            byte[] payload = new byte[size];
+            Buffer.BlockCopy(data, 4, payload, 0, size);
             return (type, size, payload);
         }
 
         // 페이로드 → 특정 타입으로 역직렬화
         public static T DeserializePayload<T>(byte[] payload)
         {
-            MemoryStream ms = new MemoryStream(payload);
+            using MemoryStream ms = new MemoryStream(payload);
             return Serializer.Deserialize<T>(ms);
         }
     }

MMOTestServer/ServerLib/RDB/Repositories/ARepository.cs

@@ -22,59 +22,59 @@ public abstract class ARepository<T> where T : class
     // Dapper.Contrib 기본 CRUD
     public async Task<T?> GetByIdAsync(int id)
     {
-        IDbConnection conn = CreateConnection();
+        using IDbConnection conn = CreateConnection();
         return await conn.GetAsync<T>(id);
     }
 
     public async Task<IEnumerable<T>> GetAllAsync()
     {
-        IDbConnection conn = CreateConnection();
+        using IDbConnection conn = CreateConnection();
         return await conn.GetAllAsync<T>();
     }
 
     public async Task<long> InsertAsync(T entity)
     {
-        IDbConnection conn = CreateConnection();
+        using IDbConnection conn = CreateConnection();
         return await conn.InsertAsync(entity);
     }
 
     public async Task<bool> UpdateAsync(T entity)
     {
-        IDbConnection conn = CreateConnection();
+        using IDbConnection conn = CreateConnection();
         return await conn.UpdateAsync(entity);
     }
 
     public async Task<bool> DeleteAsync(T entity)
     {
-        IDbConnection conn = CreateConnection();
+        using IDbConnection conn = CreateConnection();
         return await conn.DeleteAsync(entity);
     }
 
     // 커스텀 쿼리 헬퍼 (복잡한 쿼리용)
     protected async Task<IEnumerable<T>> QueryAsync(string sql, object? param = null)
     {
-        IDbConnection conn = CreateConnection();
+        using IDbConnection conn = CreateConnection();
         return await conn.QueryAsync<T>(sql, param);
     }
 
     protected async Task<T?> QueryFirstOrDefaultAsync(string sql, object? param = null)
     {
-        IDbConnection conn = CreateConnection();
+        using IDbConnection conn = CreateConnection();
         return await conn.QueryFirstOrDefaultAsync<T>(sql, param);
     }
 
     protected async Task<int> ExecuteAsync(string sql, object? param = null)
     {
-        IDbConnection conn = CreateConnection();
+        using IDbConnection conn = CreateConnection();
         return await conn.ExecuteAsync(sql, param);
     }
 
     // 트랜잭션 헬퍼
     protected async Task<TResult> WithTransactionAsync<TResult>(Func<IDbConnection, IDbTransaction, Task<TResult>> action)
     {
-        IDbConnection conn = CreateConnection();
+        using IDbConnection conn = CreateConnection();
         conn.Open();
-        IDbTransaction tx = conn.BeginTransaction();
+        using IDbTransaction tx = conn.BeginTransaction();
         try
         {
             TResult result = await action(conn, tx);

MMOTestServer/ServerLib/Service/ServerBase.cs

@@ -34,15 +34,29 @@ public abstract class ServerBase : INetEventListener
 
     // 인증된 세션      (hashKey → NetPeer)  재연결 조회용
     // peer → hashKey 역방향은 peer.Tag as Session 으로 대체
-    private readonly Dictionary<long, NetPeer> sessions = new();
+    protected readonly Dictionary<long, NetPeer> sessions = new();
+
+    // 재사용 NetDataWriter (단일 스레드 폴링이므로 안전)
+    private readonly NetDataWriter cachedWriter = new();
 
     // 핑 로그 출력 여부
-    public bool PingLogRtt { get; set; }
+    public bool PingLogRtt
+    {
+        get;
+        set;
+    }
 
-    public int Port { get; }
-    public string ConnectionString { get; }
+    public int Port
+    {
+        get;
+    }
 
-    private bool isListening = false;
+    public string ConnectionString
+    {
+        get;
+    }
+
+    private volatile bool isListening = false;
 
     public ServerBase(int port, string connectionString)
     {
@@ -71,6 +85,7 @@ public abstract class ServerBase : INetEventListener
             netManager.PollEvents();
             await Task.Delay(1);
         }
+
         netManager.Stop();
         Log.Information("[Server] 종료 Port={Port}", Port);
     }
@@ -86,7 +101,7 @@ public abstract class ServerBase : INetEventListener
         // 벤 기능 추가? 한국 ip만?
         if (request.AcceptIfKey(ConnectionString) == null)
         {
-            Log.Debug("해당 클라이언트의 ConnectionKey={request.ConnectionKey}가 동일하지 않습니다", request.Data.ToString());
+            Log.Debug("해당 클라이언트의 ConnectionKey가 동일하지 않습니다. Data={Data}", request.Data.ToString());
         }
     }
 
@@ -112,6 +127,7 @@ public abstract class ServerBase : INetEventListener
                 Log.Information("[Server] 세션 해제 HashKey={Key} Reason={Reason}", session.HashKey, disconnectInfo.Reason);
                 OnSessionDisconnected(peer, session.HashKey, disconnectInfo);
             }
+
             peer.Tag = null;
         }
     }
@@ -125,6 +141,13 @@ public abstract class ServerBase : INetEventListener
         {
             (ushort type, ushort size, byte[] payload) = PacketSerializer.Deserialize(data);
 
+            // Deserialize 실패 시 payload가 null
+            if (payload == null)
+            {
+                Log.Warning("[Server] 패킷 역직렬화 실패 PeerId={Id} DataLen={Len}", peer.Id, data.Length);
+                return;
+            }
+
             // 0이라면 에코 서버 테스트용 따로 처리
             if (type == 0)
             {
@@ -181,12 +204,11 @@ public abstract class ServerBase : INetEventListener
 
     private void HandleEcho(NetPeer peer, byte[] payload)
     {
-        // if (payload.Length < sizeof(long))
-        // {
-        //     Log.Warning("[Server] Echo 페이로드 크기 오류 PeerId={Id}", peer.Id);
-        //     peer.Disconnect();
-        //     return;
-        // }
+        if (payload.Length < 4)
+        {
+            Log.Warning("[Server] Echo 페이로드 크기 오류 PeerId={Id} Length={Len}", peer.Id, payload.Length);
+            return;
+        }
 
         // 세션에 넣지는 않는다.
         NetDataReader reader = new NetDataReader(payload);
@@ -201,12 +223,12 @@ public abstract class ServerBase : INetEventListener
 
     private void HandleAuth(NetPeer peer, byte[] payload)
     {
-        // if (payload.Length < sizeof(long))
-        // {
-        //     Log.Warning("[Server] Auth 페이로드 크기 오류 PeerId={Id}", peer.Id);
-        //     peer.Disconnect();
-        //     return;
-        // }
+        if (payload.Length < sizeof(long))
+        {
+            Log.Warning("[Server] Auth 페이로드 크기 오류 PeerId={Id} Length={Len}", peer.Id, payload.Length);
+            peer.Disconnect();
+            return;
+        }
 
         long hashKey = BitConverter.ToInt64(payload, 0);
 
@@ -229,31 +251,28 @@ public abstract class ServerBase : INetEventListener
 
     // ─── 전송 헬퍼 ───────────────────────────────────────────────────────
 
-    // NetDataWriter writer 풀처리 필요할듯
     // peer에게 전송
     protected void SendTo(NetPeer peer, byte[] data, DeliveryMethod method = DeliveryMethod.ReliableOrdered)
     {
-        NetDataWriter writer = new NetDataWriter();
-        writer.Put(data);
-        peer.Send(writer, method);
+        cachedWriter.Reset();
+        cachedWriter.Put(data);
+        peer.Send(cachedWriter, method);
     }
 
     // 모두에게 전송
     protected void Broadcast(byte[] data, DeliveryMethod method = DeliveryMethod.ReliableOrdered)
     {
-        // 일단 channelNumber는 건드리지 않는다
-        NetDataWriter writer = new NetDataWriter();
-        writer.Put(data);
-        netManager.SendToAll(writer, 0, method);
+        cachedWriter.Reset();
+        cachedWriter.Put(data);
+        netManager.SendToAll(cachedWriter, 0, method);
     }
 
     // exclude 1개 제외 / 나 제외 정도
     protected void BroadcastExcept(byte[] data, NetPeer exclude, DeliveryMethod method = DeliveryMethod.ReliableOrdered)
     {
-        // 일단 channelNumber는 건드리지 않는다
-        NetDataWriter writer = new NetDataWriter();
-        writer.Put(data);
-        netManager.SendToAll(writer, 0, method, exclude);
+        cachedWriter.Reset();
+        cachedWriter.Put(data);
+        netManager.SendToAll(cachedWriter, 0, method, exclude);
     }
 
     // ─── 서브클래스 구현 ─────────────────────────────────────────────────