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ClientTester/EchoClientTester/EchoDummyService/DummyClientService.cs

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+using LiteNetLib.Utils;
+using Serilog;
+
+namespace ClientTester.EchoDummyService;
+
+public class DummyClientService
+{
+    private readonly List<DummyClients> _clients;
+    private readonly int _sendInterval;
+
+    public DummyClientService(int count, string ip, int port, string key, int sendIntervalMs = 1000)
+    {
+        _sendInterval = sendIntervalMs;
+        _clients = Enumerable.Range(0, count)
+            .Select(i => new DummyClients(i, ip, port, key))
+            .ToList();
+
+        Log.Information("[SERVICE] {Count}개 클라이언트 생성 → {Ip}:{Port}", count, ip, port);
+    }
+
+    public async Task RunAsync(CancellationToken ct)
+    {
+        await Task.WhenAll(
+            PollLoopAsync(ct),
+            SendLoopAsync(ct)
+        );
+    }
+
+    private async Task PollLoopAsync(CancellationToken ct)
+    {
+        while (!ct.IsCancellationRequested)
+        {
+            foreach (var c in _clients)
+                c.PollEvents();
+
+            try   { await Task.Delay(15, ct); }
+            catch (OperationCanceledException) { break; }
+        }
+    }
+
+    private async Task SendLoopAsync(CancellationToken ct)
+    {
+        try   { await Task.Delay(500, ct); }
+        catch (OperationCanceledException) { return; }
+
+        int tick = 0;
+
+        while (!ct.IsCancellationRequested)
+        {
+            int sent = 0;
+
+            foreach (var client in _clients)
+            {
+                client.SendPing();
+                if (client.Peer != null) sent++;
+            }
+
+            Log.Information("[TICK {Tick:000}] {Sent}/{Total} 전송", tick, sent, _clients.Count);
+            tick++;
+
+            try   { await Task.Delay(_sendInterval, ct); }
+            catch (OperationCanceledException) { break; }
+        }
+    }
+
+    public void PrintStats()
+    {
+        int  totalSent = 0, totalRecv = 0;
+        int  connected = 0;
+
+        Log.Information("════════════ Performance Report ════════════");
+
+        double totalAvgRtt = 0;
+
+        foreach (var c in _clients)
+        {
+            var   stats   = c.Peer?.Statistics;
+            long  loss    = stats?.PacketLoss        ?? 0;
+            float lossPct = stats?.PacketLossPercent ?? 0f;
+
+            Log.Information(
+                "[Client {ClientId:00}] Sent={Sent} Recv={Recv} | Loss={Loss}({LossPct:F1}%) AvgRTT={AvgRtt:F3}ms LastRTT={LastRtt:F3}ms",
+                c.ClientId, c.SentCount, c.ReceivedCount, loss, lossPct, c.AvgRttMs, c.LastRttMs);
+
+            totalSent    += c.SentCount;
+            totalRecv    += c.ReceivedCount;
+            totalAvgRtt  += c.AvgRttMs;
+            if (c.Peer != null) connected++;
+        }
+
+        double avgRtt = connected > 0 ? totalAvgRtt / connected : 0;
+
+        Log.Information("────────────────────────────────────────────");
+        Log.Information(
+            "[TOTAL] Sent={Sent} Recv={Recv} Connected={Connected}/{Total} AvgRTT={AvgRtt:F3}ms",
+            totalSent, totalRecv, connected, _clients.Count, avgRtt);
+        Log.Information("════════════════════════════════════════════");
+    }
+
+    public void Stop()
+    {
+        foreach (var c in _clients)
+            c.Stop();
+
+        Log.Information("[SERVICE] 모든 클라이언트 종료됨.");
+    }
+}

ClientTester/EchoClientTester/EchoDummyService/DummyClients.cs

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+using System.Diagnostics;
+using LiteNetLib;
+using LiteNetLib.Utils;
+using Serilog;
+
+namespace ClientTester.EchoDummyService;
+
+public class DummyClients
+{
+    public NetManager Manager;
+    public EventBasedNetListener Listener;
+    public NetPeer? Peer;
+    public int ClientId;
+
+    // seq → 송신 타임스탬프 (Stopwatch tick)
+    private readonly Dictionary<int, long> _pendingPings = new();
+    private int _seqNumber;
+
+    // 통계
+    public int SentCount;
+    public int ReceivedCount;
+    public double LastRttMs;
+    public double TotalRttMs;
+    public int RttCount;
+
+    public DummyClients(int clientId, string ip, int port, string key)
+    {
+        ClientId = clientId;
+        Listener = new EventBasedNetListener();
+        Manager  = new NetManager(Listener);
+
+        Listener.PeerConnectedEvent += peer =>
+        {
+            Peer = peer;
+            Log.Information("[Client {ClientId:00}] 연결됨", ClientId);
+        };
+
+        Listener.NetworkReceiveEvent += (peer, reader, channel, deliveryMethod) =>
+        {
+            var msg = reader.GetString();
+
+            // "ack:seq:{seqNum}" 파싱
+            var parts = msg.Split(':');
+            if (parts.Length == 3 && parts[0] == "ack" && parts[1] == "seq"
+                && int.TryParse(parts[2], out int seq)
+                && _pendingPings.TryGetValue(seq, out long sentTick))
+            {
+                double rttMs = (Stopwatch.GetTimestamp() - sentTick)
+                               * 1000.0 / Stopwatch.Frequency;
+                LastRttMs  = rttMs;
+                TotalRttMs += rttMs;
+                RttCount++;
+                _pendingPings.Remove(seq);
+            }
+
+            ReceivedCount++;
+            reader.Recycle();
+        };
+
+        Listener.PeerDisconnectedEvent += (peer, info) =>
+        {
+            Log.Warning("[Client {ClientId:00}] 연결 끊김: {Reason}", ClientId, info.Reason);
+            Peer = null;
+        };
+
+        Manager.Start();
+        Manager.Connect(ip, port, key);
+    }
+
+    public void SendPing()
+    {
+        if (Peer is null) return;
+
+        int seq = _seqNumber++;
+        _pendingPings[seq] = Stopwatch.GetTimestamp();
+
+        var writer = new NetDataWriter();
+        writer.Put($"seq:{seq}");
+        Peer.Send(writer, DeliveryMethod.ReliableOrdered);
+        SentCount++;
+    }
+
+    public double AvgRttMs => RttCount > 0 ? TotalRttMs / RttCount : 0.0;
+
+    public void PollEvents() => Manager.PollEvents();
+
+    public void Stop() => Manager.Stop();
+}