add chatserver & client

SubProject/ChatServer/App.config

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+  <configSections>
+    <sectionGroup name="userSettings" type="System.Configuration.UserSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" >
+      <section name="ChatServer.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" allowExeDefinition="MachineToLocalUser" requirePermission="false" />
+    </sectionGroup>
+  </configSections>
+  <startup>
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.8" />
+  </startup>
+  <appSettings>
+    <!-- TCP 채팅 서버 포트 -->
+    <add key="TcpPort" value="5000" />
+    <!-- 최대 동시 접속자 수 -->
+    <add key="MaxClients" value="100" />
+  </appSettings>
+  <userSettings>
+    <ChatServer.Properties.Settings>
+      <setting name="TcpPort" serializeAs="String">
+        <value>5000</value>
+      </setting>
+      <setting name="MaxClients" serializeAs="String">
+        <value>1000</value>
+      </setting>
+    </ChatServer.Properties.Settings>
+  </userSettings>
+</configuration>

SubProject/ChatServer/ChatClient.cs

@@ -0,0 +1,174 @@
+using System;
+using System.Net.Sockets;
+using System.Text;
+using System.Threading;
+using Newtonsoft.Json;
+
+namespace NoticeServer
+{
+    /// <summary>
+    /// 연결된 채팅 클라이언트 정보 및 통신 관리
+    /// </summary>
+    public class ChatClient
+    {
+        private TcpClient tcpClient;
+        private NetworkStream stream;
+        private Thread receiveThread;
+        private bool isConnected;
+
+        /// <summary>클라이언트 고유 ID</summary>
+        public string ClientId { get; private set; }
+
+        /// <summary>닉네임</summary>
+        public string NickName { get; set; }
+
+        /// <summary>사원번호 (Employee ID)</summary>
+        public string EmployeeId { get; set; }
+
+        /// <summary>사용자 그룹</summary>
+        public string UserGroup { get; set; }
+
+        /// <summary>IP 주소</summary>
+        public string IpAddress { get; private set; }
+
+        /// <summary>호스트명</summary>
+        public string HostName { get; set; }
+
+        /// <summary>연결 시간</summary>
+        public DateTime ConnectedTime { get; private set; }
+
+        /// <summary>마지막 활동 시간</summary>
+        public DateTime LastActivity { get; set; }
+
+        /// <summary>메시지 수신 이벤트</summary>
+        public event EventHandler<ChatMessage> MessageReceived;
+
+        /// <summary>연결 해제 이벤트</summary>
+        public event EventHandler<string> Disconnected;
+
+        public ChatClient(TcpClient client)
+        {
+            tcpClient = client;
+            stream = client.GetStream();
+            isConnected = true;
+            ClientId = Guid.NewGuid().ToString();
+            ConnectedTime = DateTime.Now;
+            LastActivity = DateTime.Now;
+
+            var endpoint = client.Client.RemoteEndPoint.ToString();
+            IpAddress = endpoint.Split(':')[0];
+
+            StartReceiving();
+        }
+
+        /// <summary>
+        /// 메시지 수신 스레드 시작
+        /// </summary>
+        private void StartReceiving()
+        {
+            receiveThread = new Thread(ReceiveLoop)
+            {
+                IsBackground = true,
+                Name = $"ChatClient-{ClientId}"
+            };
+            receiveThread.Start();
+        }
+
+        /// <summary>
+        /// 메시지 수신 루프
+        /// </summary>
+        private void ReceiveLoop()
+        {
+            byte[] buffer = new byte[4096];
+
+            try
+            {
+                while (isConnected && tcpClient.Connected)
+                {
+                    int bytesRead = stream.Read(buffer, 0, buffer.Length);
+                    if (bytesRead == 0)
+                    {
+                        // Connection closed
+                        break;
+                    }
+
+                    string jsonData = Encoding.UTF8.GetString(buffer, 0, bytesRead);
+                    var message = JsonConvert.DeserializeObject<ChatMessage>(jsonData);
+
+                    if (message != null)
+                    {
+                        LastActivity = DateTime.Now;
+
+                        // Set nickname, employeeId, userGroup from Connect message
+                        if (message.Type == MessageType.Connect && !string.IsNullOrEmpty(message.NickName))
+                        {
+                            NickName = message.NickName;
+                            EmployeeId = message.EmployeeId;
+                            UserGroup = message.UserGroup;
+                            HostName = message.HostName;
+                        }
+
+                        MessageReceived?.Invoke(this, message);
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"[ERROR] Client {NickName ?? ClientId} receive error: {ex.Message}");
+            }
+            finally
+            {
+                Disconnect();
+            }
+        }
+
+        /// <summary>
+        /// Send message
+        /// </summary>
+        public bool SendMessage(ChatMessage message)
+        {
+            if (!isConnected || !tcpClient.Connected)
+                return false;
+
+            try
+            {
+                string jsonData = JsonConvert.SerializeObject(message);
+                byte[] data = Encoding.UTF8.GetBytes(jsonData);
+                stream.Write(data, 0, data.Length);
+                stream.Flush();
+                return true;
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"[ERROR] Client {NickName ?? ClientId} send error: {ex.Message}");
+                Disconnect();
+                return false;
+            }
+        }
+
+        /// <summary>
+        /// 연결 해제
+        /// </summary>
+        public void Disconnect()
+        {
+            if (!isConnected)
+                return;
+
+            isConnected = false;
+
+            try
+            {
+                stream?.Close();
+                tcpClient?.Close();
+            }
+            catch { }
+
+            Disconnected?.Invoke(this, ClientId);
+        }
+
+        public override string ToString()
+        {
+            return $"{NickName ?? "Unknown"} ({IpAddress})";
+        }
+    }
+}

SubProject/ChatServer/ChatMessage.cs

@@ -0,0 +1,76 @@
+using System;
+
+namespace NoticeServer
+{
+    /// <summary>
+    /// 채팅 메시지 타입
+    /// </summary>
+    public enum MessageType
+    {
+        /// <summary>클라이언트 연결</summary>
+        Connect,
+        /// <summary>클라이언트 연결 해제</summary>
+        Disconnect,
+        /// <summary>일반 채팅 메시지</summary>
+        Chat,
+        /// <summary>서버 공지</summary>
+        Notice,
+        /// <summary>귓속말</summary>
+        Whisper,
+        /// <summary>사용자 목록 요청</summary>
+        UserListRequest,
+        /// <summary>사용자 목록 응답</summary>
+        UserListResponse,
+        /// <summary>핑 (연결 유지)</summary>
+        Ping,
+        /// <summary>퐁 (핑 응답)</summary>
+        Pong
+    }
+
+    /// <summary>
+    /// 채팅 메시지 프로토콜
+    /// </summary>
+    [Serializable]
+    public class ChatMessage
+    {
+        /// <summary>메시지 타입</summary>
+        public MessageType Type { get; set; }
+
+        /// <summary>발신자 닉네임</summary>
+        public string NickName { get; set; }
+
+        /// <summary>발신자 사원번호 (Employee ID)</summary>
+        public string EmployeeId { get; set; }
+
+        /// <summary>발신자 IP</summary>
+        public string IpAddress { get; set; }
+
+        /// <summary>발신자 호스트명</summary>
+        public string HostName { get; set; }
+
+        /// <summary>메시지 내용</summary>
+        public string Content { get; set; }
+
+        /// <summary>수신자 사원번호 (1:1 채팅용)</summary>
+        public string TargetEmployeeId { get; set; }
+
+        /// <summary>수신자 닉네임 (귓속말용, null이면 전체)</summary>
+        public string TargetNickName { get; set; }
+
+        /// <summary>전송 시간</summary>
+        public DateTime Timestamp { get; set; }
+
+        /// <summary>사용자 그룹</summary>
+        public string UserGroup { get; set; }
+
+        public ChatMessage()
+        {
+            Timestamp = DateTime.Now;
+        }
+
+        public override string ToString()
+        {
+            return $"[{Timestamp:HH:mm:ss}] {NickName}: {Content}";
+        }
+    }
+}

SubProject/ChatServer/NoticeServer.csproj

@@ -0,0 +1,73 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{8E9A4B1C-6D5F-4E2A-9F3B-1C8D7E6A5B4F}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <RootNamespace>NoticeServer</RootNamespace>
+    <AssemblyName>NoticeServer</AssemblyName>
+    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
+    <Deterministic>true</Deterministic>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <PlatformTarget>x86</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.ServiceProcess" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xml" />
+    <Reference Include="Newtonsoft.Json, Version=13.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\Newtonsoft.Json.13.0.3\lib\net45\Newtonsoft.Json.dll</HintPath>
+    </Reference>
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Program.cs" />
+    <Compile Include="NoticeService.cs">
+      <SubType>Component</SubType>
+    </Compile>
+    <Compile Include="Properties\Settings.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DesignTimeSharedInput>True</DesignTimeSharedInput>
+      <DependentUpon>Settings.settings</DependentUpon>
+    </Compile>
+    <Compile Include="TcpChatServer.cs" />
+    <Compile Include="ChatClient.cs" />
+    <Compile Include="ChatMessage.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="App.config" />
+    <None Include="packages.config" />
+    <None Include="Properties\Settings.settings">
+      <Generator>SettingsSingleFileGenerator</Generator>
+      <LastGenOutput>Settings.Designer.cs</LastGenOutput>
+    </None>
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>

SubProject/ChatServer/NoticeService.cs

@@ -0,0 +1,116 @@
+using System;
+using System.ServiceProcess;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Diagnostics;
+
+namespace NoticeServer
+{
+    public partial class NoticeService : ServiceBase
+    {
+        private CancellationTokenSource _cancellationTokenSource;
+        private Task _serviceTask;
+        private static TcpChatServer _tcpServer;
+
+        public NoticeService()
+        {
+            InitializeComponent();
+            ServiceName = "EETGWNoticeService";
+            CanStop = true;
+            CanPauseAndContinue = false;
+            AutoLog = true;
+        }
+
+        protected override void OnStart(string[] args)
+        {
+            try
+            {
+                EventLog.WriteEntry(ServiceName, "Notice 서비스가 시작됩니다.", EventLogEntryType.Information);
+
+                _cancellationTokenSource = new CancellationTokenSource();
+                _serviceTask = Task.Run(() => DoWork(_cancellationTokenSource.Token));
+
+                EventLog.WriteEntry(ServiceName, "Notice 서비스가 성공적으로 시작되었습니다.", EventLogEntryType.Information);
+            }
+            catch (Exception ex)
+            {
+                EventLog.WriteEntry(ServiceName, $"서비스 시작 중 오류 발생: {ex.Message}", EventLogEntryType.Error);
+                throw;
+            }
+        }
+
+        protected override void OnStop()
+        {
+            try
+            {
+                EventLog.WriteEntry(ServiceName, "Notice 서비스를 중지합니다.", EventLogEntryType.Information);
+
+                _cancellationTokenSource?.Cancel();
+
+                // Stop server
+                _tcpServer?.Stop();
+
+                if (_serviceTask != null)
+                {
+                    // 최대 30초 대기
+                    if (!_serviceTask.Wait(TimeSpan.FromSeconds(30)))
+                    {
+                        EventLog.WriteEntry(ServiceName, "서비스 중지 시간 초과", EventLogEntryType.Warning);
+                    }
+                }
+
+                EventLog.WriteEntry(ServiceName, "Notice 서비스가 중지되었습니다.", EventLogEntryType.Information);
+            }
+            catch (Exception ex)
+            {
+                EventLog.WriteEntry(ServiceName, $"서비스 중지 중 오류 발생: {ex.Message}", EventLogEntryType.Error);
+            }
+            finally
+            {
+                _cancellationTokenSource?.Dispose();
+                _serviceTask?.Dispose();
+            }
+        }
+
+        private void DoWork(CancellationToken cancellationToken)
+        {
+            EventLog.WriteEntry(ServiceName, "Notice 서비스 작업을 시작합니다.", EventLogEntryType.Information);
+
+            try
+            {
+                // Read settings
+                int tcpPort = Properties.Settings.Default.TcpPort;
+                int maxClients = Properties.Settings.Default.MaxClients;
+
+                // Start server
+                _tcpServer = new TcpChatServer(tcpPort, maxClients);
+                _tcpServer.Start();
+
+                EventLog.WriteEntry(ServiceName, $"Notice 서버가 포트 {tcpPort}에서 시작되었습니다.", EventLogEntryType.Information);
+
+                // Wait for cancellation
+                while (!cancellationToken.IsCancellationRequested)
+                {
+                    if (cancellationToken.WaitHandle.WaitOne(1000))
+                    {
+                        break; // 취소 요청 시 종료
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                EventLog.WriteEntry(ServiceName, $"서버 실행 중 오류 발생: {ex.Message}\n{ex.StackTrace}", EventLogEntryType.Error);
+            }
+
+            EventLog.WriteEntry(ServiceName, "Notice 서비스 작업이 종료되었습니다.", EventLogEntryType.Information);
+        }
+
+        private void InitializeComponent()
+        {
+            //
+            // NoticeService
+            //
+            this.ServiceName = "EETGWNoticeService";
+        }
+    }
+}

SubProject/ChatServer/Program.cs

@@ -0,0 +1,288 @@
+using System;
+using System.Configuration;
+using System.Diagnostics;
+using System.Linq;
+using System.Net;
+using System.Net.Sockets;
+using System.ServiceProcess;
+using System.Threading;
+
+namespace NoticeServer
+{
+    partial class Program
+    {
+        static TcpChatServer tcpServer;
+        static bool isRunning = true;
+
+        static void Main(string[] args)
+        {
+            // 명령행 인수 처리
+            if (args.Length > 0)
+            {
+                string command = args[0].ToLower();
+                switch (command)
+                {
+                    case "-install":
+                    case "/install":
+                        InstallService();
+                        return;
+                    case "-uninstall":
+                    case "/uninstall":
+                        UninstallService();
+                        return;
+                    case "-console":
+                    case "/console":
+                        RunAsConsole();
+                        return;
+                    case "-help":
+                    case "/help":
+                    case "/?":
+                        ShowHelp();
+                        return;
+                }
+            }
+
+            // 서비스로 실행
+            if (Environment.UserInteractive)
+            {
+                // 대화형 모드에서는 콘솔로 실행
+                RunAsConsole();
+            }
+            else
+            {
+                // 서비스로 실행
+                ServiceBase[] ServicesToRun;
+                ServicesToRun = new ServiceBase[]
+                {
+                    new NoticeService()
+                };
+                ServiceBase.Run(ServicesToRun);
+            }
+        }
+
+        private static void ShowHelp()
+        {
+            Console.WriteLine("EETGW Notice Server (Chat Server)");
+            Console.WriteLine("사용법:");
+            Console.WriteLine("  NoticeServer.exe               - 서비스로 실행 (또는 대화형 모드에서 콘솔 실행)");
+            Console.WriteLine("  NoticeServer.exe -console      - 콘솔 모드로 실행");
+            Console.WriteLine("  NoticeServer.exe -install      - 서비스 설치");
+            Console.WriteLine("  NoticeServer.exe -uninstall    - 서비스 제거");
+            Console.WriteLine("  NoticeServer.exe -help         - 도움말 표시");
+        }
+
+        private static void InstallService()
+        {
+            try
+            {
+                string servicePath = $"\"{System.Reflection.Assembly.GetExecutingAssembly().Location}\"";
+                ProcessStartInfo startInfo = new ProcessStartInfo
+                {
+                    FileName = "sc.exe",
+                    Arguments = $"create EETGWNoticeService binPath= \"{servicePath}\" DisplayName= \"EETGW Notice Service\" start= auto",
+                    UseShellExecute = false,
+                    RedirectStandardOutput = true,
+                    RedirectStandardError = true,
+                    CreateNoWindow = true
+                };
+
+                using (Process process = Process.Start(startInfo))
+                {
+                    process.WaitForExit();
+                    if (process.ExitCode == 0)
+                    {
+                        Console.WriteLine("서비스가 성공적으로 설치되었습니다.");
+                        Console.WriteLine("서비스를 시작하려면 다음 명령을 실행하세요:");
+                        Console.WriteLine("net start EETGWNoticeService");
+                    }
+                    else
+                    {
+                        string error = process.StandardError.ReadToEnd();
+                        Console.WriteLine($"서비스 설치 실패: {error}");
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"서비스 설치 중 오류 발생: {ex.Message}");
+            }
+        }
+
+        private static void UninstallService()
+        {
+            try
+            {
+                ProcessStartInfo startInfo = new ProcessStartInfo
+                {
+                    FileName = "sc.exe",
+                    Arguments = "delete EETGWNoticeService",
+                    UseShellExecute = false,
+                    RedirectStandardOutput = true,
+                    RedirectStandardError = true,
+                    CreateNoWindow = true
+                };
+
+                using (Process process = Process.Start(startInfo))
+                {
+                    process.WaitForExit();
+                    if (process.ExitCode == 0)
+                    {
+                        Console.WriteLine("서비스가 성공적으로 제거되었습니다.");
+                    }
+                    else
+                    {
+                        string error = process.StandardError.ReadToEnd();
+                        Console.WriteLine($"서비스 제거 실패: {error}");
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"서비스 제거 중 오류 발생: {ex.Message}");
+            }
+        }
+
+        private static void RunAsConsole()
+        {
+            // 중복실행 방지 체크
+            if (!CheckSingleInstance())
+            {
+                return; // 프로그램 종료
+            }
+
+            Console.OutputEncoding = System.Text.Encoding.UTF8;
+            Console.Title = "EETGW Notice Server (Chat Server)";
+            Console.WriteLine("========================================");
+            Console.WriteLine("  EETGW Notice Server v1.0 (콘솔 모드)");
+            Console.WriteLine("========================================\n");
+
+            // Read settings
+            int tcpPort = Properties.Settings.Default.TcpPort;
+            int maxClients = Properties.Settings.Default.MaxClients;
+
+            // Get local IP address
+            string localIP = GetLocalIPAddress();
+            string hostName = Dns.GetHostName();
+
+            Console.WriteLine($"Server IP: {localIP}");
+            Console.WriteLine($"Host Name: {hostName}");
+            Console.WriteLine($"TCP Port: {tcpPort}");
+            Console.WriteLine($"Max Clients: {maxClients}\n");
+
+            // Start server
+            tcpServer = new TcpChatServer(tcpPort, maxClients);
+            tcpServer.Start();
+
+            Console.WriteLine("\nServer started successfully.");
+            Console.WriteLine("Commands: status, clear, quit, help");
+            Console.WriteLine("종료하려면 Ctrl+C를 누르거나 'quit'를 입력하세요.\n");
+
+            // Ctrl+C handler
+            Console.CancelKeyPress += (sender, e) =>
+            {
+                Console.WriteLine("\n서버를 종료합니다...");
+                e.Cancel = true;
+                isRunning = false;
+            };
+
+            // Command processing loop
+            while (isRunning)
+            {
+                string command = Console.ReadLine()?.Trim().ToLower();
+
+                switch (command)
+                {
+                    case "status":
+                    case "s":
+                        tcpServer.PrintStatus();
+                        break;
+
+                    case "clear":
+                    case "cls":
+                        Console.Clear();
+                        Console.WriteLine("EETGW Notice Server - Commands: status, clear, quit\n");
+                        break;
+
+                    case "quit":
+                    case "exit":
+                    case "q":
+                        isRunning = false;
+                        break;
+
+                    case "help":
+                    case "h":
+                    case "?":
+                        PrintHelp();
+                        break;
+
+                    case "":
+                        break;
+
+                    default:
+                        Console.WriteLine($"Unknown command: {command}");
+                        Console.WriteLine("Available commands: status, clear, quit, help");
+                        break;
+                }
+
+                Thread.Sleep(100);
+            }
+
+            // Server shutdown
+            Console.WriteLine("\nShutting down server...");
+            tcpServer.Stop();
+
+            Console.WriteLine("Server stopped.");
+            Thread.Sleep(1000);
+        }
+
+        /// <summary>
+        /// 중복실행 방지 체크
+        /// </summary>
+        /// <returns>단일 인스턴스인 경우 true, 중복실행인 경우 false</returns>
+        static bool CheckSingleInstance()
+        {
+            string processName = Process.GetCurrentProcess().ProcessName;
+            Process[] processes = Process.GetProcessesByName(processName);
+
+            if (processes.Length > 1)
+            {
+                // 중복실행 감지
+                string message = $"⚠️ 프로그램이 이미 실행 중입니다!\n\n" +
+                                "동시에 여러 개의 프로그램을 실행할 수 없습니다.\n";
+
+                Console.WriteLine(message);
+                return false;
+            }
+
+            return true; // 단일 인스턴스
+        }
+
+        static string GetLocalIPAddress()
+        {
+            try
+            {
+                var host = Dns.GetHostEntry(Dns.GetHostName());
+                var ipAddress = host.AddressList
+                    .FirstOrDefault(ip => ip.AddressFamily == AddressFamily.InterNetwork);
+
+                if (ipAddress != null)
+                    return ipAddress.ToString();
+            }
+            catch { }
+
+            return "127.0.0.1";
+        }
+
+        static void PrintHelp()
+        {
+            Console.WriteLine("\n========================================");
+            Console.WriteLine("Available Commands:");
+            Console.WriteLine("========================================");
+            Console.WriteLine("status (s)  - Show server status and client list");
+            Console.WriteLine("clear (cls) - Clear screen");
+            Console.WriteLine("quit (q)    - Stop server");
+            Console.WriteLine("help (h)    - Show this help");
+            Console.WriteLine("========================================\n");
+        }
+    }
+}

SubProject/ChatServer/Properties/AssemblyInfo.cs

@@ -0,0 +1,33 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// 어셈블리에 대한 일반 정보는 다음 특성 집합을 통해
+// 제어됩니다. 어셈블리와 관련된 정보를 수정하려면
+// 이러한 특성 값을 변경하세요.
+[assembly: AssemblyTitle("ChatServer")]
+[assembly: AssemblyDescription("GroupWare Chat Server - TCP/UDP 기반 다중 사용자 채팅 서버")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("ChatServer")]
+[assembly: AssemblyCopyright("Copyright © 2025")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// ComVisible을 false로 설정하면 이 어셈블리의 형식이 COM 구성 요소에
+// 표시되지 않습니다. COM에서 이 어셈블리의 형식에 액세스하려면
+// 해당 형식에 대해 ComVisible 특성을 true로 설정하세요.
+[assembly: ComVisible(false)]
+
+// 이 프로젝트가 COM에 노출되는 경우 다음 GUID는 typelib의 ID를 나타냅니다.
+[assembly: Guid("8e9a4b1c-6d5f-4e2a-9f3b-1c8d7e6a5b4f")]
+
+// 어셈블리의 버전 정보는 다음 네 가지 값으로 구성됩니다.
+//
+//      주 버전
+//      부 버전
+//      빌드 번호
+//      수정 버전
+//
+[assembly: AssemblyVersion("25.11.12.1300")]
+[assembly: AssemblyFileVersion("25.11.12.1300")]

SubProject/ChatServer/Properties/Settings.Designer.cs

@@ -0,0 +1,50 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     이 코드는 도구를 사용하여 생성되었습니다.
+//     런타임 버전:4.0.30319.42000
+//
+//     파일 내용을 변경하면 잘못된 동작이 발생할 수 있으며, 코드를 다시 생성하면
+//     이러한 변경 내용이 손실됩니다.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace ChatServer.Properties {
+    
+    
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.VisualStudio.Editors.SettingsDesigner.SettingsSingleFileGenerator", "15.9.0.0")]
+    internal sealed partial class Settings : global::System.Configuration.ApplicationSettingsBase {
+        
+        private static Settings defaultInstance = ((Settings)(global::System.Configuration.ApplicationSettingsBase.Synchronized(new Settings())));
+        
+        public static Settings Default {
+            get {
+                return defaultInstance;
+            }
+        }
+        
+        [global::System.Configuration.UserScopedSettingAttribute()]
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+        [global::System.Configuration.DefaultSettingValueAttribute("5000")]
+        public int TcpPort {
+            get {
+                return ((int)(this["TcpPort"]));
+            }
+            set {
+                this["TcpPort"] = value;
+            }
+        }
+        
+        [global::System.Configuration.UserScopedSettingAttribute()]
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+        [global::System.Configuration.DefaultSettingValueAttribute("1000")]
+        public int MaxClients {
+            get {
+                return ((int)(this["MaxClients"]));
+            }
+            set {
+                this["MaxClients"] = value;
+            }
+        }
+    }
+}

SubProject/ChatServer/Properties/Settings.settings

@@ -0,0 +1,12 @@
+<?xml version='1.0' encoding='utf-8'?>
+<SettingsFile xmlns="http://schemas.microsoft.com/VisualStudio/2004/01/settings" CurrentProfile="(Default)" GeneratedClassNamespace="ChatServer.Properties" GeneratedClassName="Settings">
+  <Profiles />
+  <Settings>
+    <Setting Name="TcpPort" Type="System.Int32" Scope="User">
+      <Value Profile="(Default)">5000</Value>
+    </Setting>
+    <Setting Name="MaxClients" Type="System.Int32" Scope="User">
+      <Value Profile="(Default)">1000</Value>
+    </Setting>
+  </Settings>
+</SettingsFile>

SubProject/ChatServer/TcpChatServer.cs

@@ -0,0 +1,421 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net;
+using System.Net.Sockets;
+using System.Threading;
+
+namespace NoticeServer
+{
+    /// <summary>
+    /// TCP 채팅 서버
+    /// </summary>
+    public class TcpChatServer
+    {
+        private TcpListener tcpListener;
+        private Thread acceptThread;
+        private bool isRunning;
+        private int tcpPort;
+        private int maxClients;
+
+        private readonly object clientsLock = new object();
+        private List<ChatClient> clients = new List<ChatClient>();
+
+        public TcpChatServer(int tcpPort, int maxClients = 100)
+        {
+            this.tcpPort = tcpPort;
+            this.maxClients = maxClients;
+        }
+
+        /// <summary>
+        /// TCP 채팅 서버 시작
+        /// </summary>
+        public void Start()
+        {
+            if (isRunning)
+                return;
+
+            try
+            {
+                tcpListener = new TcpListener(IPAddress.Any, tcpPort);
+                tcpListener.Start();
+                isRunning = true;
+
+                acceptThread = new Thread(AcceptLoop)
+                {
+                    IsBackground = true,
+                    Name = "TcpAcceptThread"
+                };
+                acceptThread.Start();
+
+                Console.WriteLine($"[TCP] Chat server started (Port: {tcpPort})");
+                Console.WriteLine($"[TCP] Max clients: {maxClients}");
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"[ERROR] Failed to start TCP server: {ex.Message}");
+                isRunning = false;
+            }
+        }
+
+        /// <summary>
+        /// 클라이언트 연결 수락 루프
+        /// </summary>
+        private void AcceptLoop()
+        {
+            while (isRunning)
+            {
+                try
+                {
+                    TcpClient tcpClient = tcpListener.AcceptTcpClient();
+
+                    lock (clientsLock)
+                    {
+                        if (clients.Count >= maxClients)
+                        {
+                            Console.WriteLine("[REJECTED] Maximum clients exceeded");
+                            tcpClient.Close();
+                            continue;
+                        }
+                    }
+
+                    var client = new ChatClient(tcpClient);
+                    client.MessageReceived += OnClientMessageReceived;
+                    client.Disconnected += OnClientDisconnected;
+
+                    lock (clientsLock)
+                    {
+                        clients.Add(client);
+                    }
+
+                    Console.WriteLine($"[CONNECTED] New client: {client.IpAddress} (ID: {client.ClientId})");
+                }
+                catch (SocketException)
+                {
+                    // Server shutdown
+                    break;
+                }
+                catch (Exception ex)
+                {
+                    Console.WriteLine($"[ERROR] Client accept error: {ex.Message}");
+                }
+            }
+        }
+
+        /// <summary>
+        /// 클라이언트 메시지 수신 이벤트 핸들러
+        /// </summary>
+        private void OnClientMessageReceived(object sender, ChatMessage message)
+        {
+            var client = sender as ChatClient;
+            if (client == null)
+                return;
+
+            Console.WriteLine($"[RECEIVED] {client.NickName ?? client.IpAddress}: {message.Type} - {message.Content}");
+
+            switch (message.Type)
+            {
+                case MessageType.Connect:
+                    HandleConnect(client, message);
+                    break;
+
+                case MessageType.Chat:
+                    HandleChat(client, message);
+                    break;
+
+                case MessageType.Whisper:
+                    HandleWhisper(client, message);
+                    break;
+
+                case MessageType.UserListRequest:
+                    HandleUserListRequest(client);
+                    break;
+
+                case MessageType.Ping:
+                    HandlePing(client);
+                    break;
+
+                case MessageType.Disconnect:
+                    client.Disconnect();
+                    break;
+            }
+        }
+
+        /// <summary>
+        /// 연결 처리
+        /// </summary>
+        private void HandleConnect(ChatClient client, ChatMessage message)
+        {
+            // Check employee ID duplication
+            lock (clientsLock)
+            {
+                if (!string.IsNullOrEmpty(message.EmployeeId) &&
+                    clients.Any(c => c.ClientId != client.ClientId && c.EmployeeId == message.EmployeeId))
+                {
+                    var errorMsg = new ChatMessage
+                    {
+                        Type = MessageType.Notice,
+                        Content = "Employee ID already connected.",
+                        Timestamp = DateTime.Now
+                    };
+                    client.SendMessage(errorMsg);
+                    client.Disconnect();
+                    return;
+                }
+            }
+
+            Console.WriteLine($"[LOGIN] {message.NickName} ({message.EmployeeId}, {message.UserGroup}) from {client.IpAddress}, {message.HostName}");
+
+            // Welcome message
+            var welcomeMsg = new ChatMessage
+            {
+                Type = MessageType.Notice,
+                Content = $"Welcome to the chat server, {message.NickName}!",
+                Timestamp = DateTime.Now
+            };
+            client.SendMessage(welcomeMsg);
+
+            // Notify other users
+            var noticeMsg = new ChatMessage
+            {
+                Type = MessageType.Notice,
+                Content = $"{message.NickName} ({message.EmployeeId}) has joined the chat.",
+                Timestamp = DateTime.Now
+            };
+            BroadcastMessage(noticeMsg, client.ClientId);
+        }
+
+        /// <summary>
+        /// 채팅 메시지 처리 (1:1 messaging)
+        /// </summary>
+        private void HandleChat(ChatClient client, ChatMessage message)
+        {
+            // Set sender information
+            message.NickName = client.NickName;
+            message.EmployeeId = client.EmployeeId;
+            message.UserGroup = client.UserGroup;
+            message.IpAddress = client.IpAddress;
+            message.HostName = client.HostName;
+            message.Timestamp = DateTime.Now;
+
+            // Send to target recipient (1:1 messaging)
+            if (!string.IsNullOrEmpty(message.TargetEmployeeId))
+            {
+                lock (clientsLock)
+                {
+                    // Find target by employee ID
+                    var targetClient = clients.FirstOrDefault(c => c.EmployeeId == message.TargetEmployeeId);
+                    if (targetClient != null)
+                    {
+                        // Send to target
+                        targetClient.SendMessage(message);
+                        // Echo back to sender
+                        client.SendMessage(message);
+                        Console.WriteLine($"[CHAT] {client.EmployeeId} -> {message.TargetEmployeeId}: {message.Content}");
+                    }
+                    else
+                    {
+                        var errorMsg = new ChatMessage
+                        {
+                            Type = MessageType.Notice,
+                            Content = $"User '{message.TargetEmployeeId}' not found or offline.",
+                            Timestamp = DateTime.Now
+                        };
+                        client.SendMessage(errorMsg);
+                    }
+                }
+            }
+            else
+            {
+                // No target specified, send error
+                var errorMsg = new ChatMessage
+                {
+                    Type = MessageType.Notice,
+                    Content = "Please select a recipient.",
+                    Timestamp = DateTime.Now
+                };
+                client.SendMessage(errorMsg);
+            }
+        }
+
+        /// <summary>
+        /// Whisper message handler
+        /// </summary>
+        private void HandleWhisper(ChatClient client, ChatMessage message)
+        {
+            message.NickName = client.NickName;
+            message.IpAddress = client.IpAddress;
+            message.Timestamp = DateTime.Now;
+
+            lock (clientsLock)
+            {
+                var targetClient = clients.FirstOrDefault(c => c.NickName == message.TargetNickName);
+                if (targetClient != null)
+                {
+                    targetClient.SendMessage(message);
+                    Console.WriteLine($"[WHISPER] {client.NickName} -> {message.TargetNickName}: {message.Content}");
+                }
+                else
+                {
+                    var errorMsg = new ChatMessage
+                    {
+                        Type = MessageType.Notice,
+                        Content = $"User '{message.TargetNickName}' not found.",
+                        Timestamp = DateTime.Now
+                    };
+                    client.SendMessage(errorMsg);
+                }
+            }
+        }
+
+        /// <summary>
+        /// 사용자 목록 요청 처리
+        /// </summary>
+        private void HandleUserListRequest(ChatClient client)
+        {
+            lock (clientsLock)
+            {
+                // Format: "employeeId1:nickName1:userGroup1,employeeId2:nickName2:userGroup2,..."
+                // Filter: dev can see all, others can only see same group
+                var filteredClients = clients
+                    .Where(c => !string.IsNullOrEmpty(c.NickName) && !string.IsNullOrEmpty(c.EmployeeId))
+                    .Where(c => client.UserGroup == "dev" || c.UserGroup == client.UserGroup);
+
+                var userListStr = string.Join(",", filteredClients
+                    .Select(c => $"{c.EmployeeId}:{c.NickName}:{c.UserGroup ?? "default"}"));
+
+                var response = new ChatMessage
+                {
+                    Type = MessageType.UserListResponse,
+                    Content = userListStr,
+                    Timestamp = DateTime.Now
+                };
+
+                client.SendMessage(response);
+
+                Console.WriteLine($"[USER_LIST] Sent to {client.EmployeeId} ({client.UserGroup}): {userListStr}");
+            }
+        }
+
+        /// <summary>
+        /// Ping 처리
+        /// </summary>
+        private void HandlePing(ChatClient client)
+        {
+            var pongMsg = new ChatMessage
+            {
+                Type = MessageType.Pong,
+                Timestamp = DateTime.Now
+            };
+            client.SendMessage(pongMsg);
+        }
+
+        /// <summary>
+        /// 클라이언트 연결 해제 이벤트 핸들러
+        /// </summary>
+        private void OnClientDisconnected(object sender, string clientId)
+        {
+            ChatClient disconnectedClient = null;
+
+            lock (clientsLock)
+            {
+                disconnectedClient = clients.FirstOrDefault(c => c.ClientId == clientId);
+                if (disconnectedClient != null)
+                {
+                    clients.Remove(disconnectedClient);
+                }
+            }
+
+            if (disconnectedClient != null)
+            {
+                Console.WriteLine($"[DISCONNECTED] {disconnectedClient.NickName ?? disconnectedClient.IpAddress} (ID: {clientId})");
+
+                if (!string.IsNullOrEmpty(disconnectedClient.NickName))
+                {
+                    var noticeMsg = new ChatMessage
+                    {
+                        Type = MessageType.Notice,
+                        Content = $"{disconnectedClient.NickName} has left the chat.",
+                        Timestamp = DateTime.Now
+                    };
+                    BroadcastMessage(noticeMsg);
+                }
+            }
+        }
+
+        /// <summary>
+        /// 모든 클라이언트에게 메시지 전송
+        /// </summary>
+        private void BroadcastMessage(ChatMessage message, string excludeClientId = null)
+        {
+            lock (clientsLock)
+            {
+                foreach (var client in clients.ToList())
+                {
+                    if (excludeClientId != null && client.ClientId == excludeClientId)
+                        continue;
+
+                    if (!string.IsNullOrEmpty(client.NickName))
+                    {
+                        client.SendMessage(message);
+                    }
+                }
+            }
+        }
+
+        /// <summary>
+        /// 서버 상태 출력
+        /// </summary>
+        public void PrintStatus()
+        {
+            Console.WriteLine("\n========================================");
+            Console.WriteLine($"Current Clients: {clients.Count}/{maxClients}");
+            Console.WriteLine("========================================");
+
+            lock (clientsLock)
+            {
+                foreach (var client in clients)
+                {
+                    if (!string.IsNullOrEmpty(client.NickName))
+                    {
+                        Console.WriteLine($"- {client.NickName} ({client.EmployeeId}, {client.UserGroup})");
+                        Console.WriteLine($"  IP: {client.IpAddress}, Host: {client.HostName}");
+                        Console.WriteLine($"  Connected: {client.ConnectedTime:yyyy-MM-dd HH:mm:ss}");
+                        Console.WriteLine($"  Last Activity: {client.LastActivity:HH:mm:ss}");
+                    }
+                }
+            }
+
+            Console.WriteLine("========================================\n");
+        }
+
+        /// <summary>
+        /// TCP 서버 중지
+        /// </summary>
+        public void Stop()
+        {
+            if (!isRunning)
+                return;
+
+            isRunning = false;
+
+            // Disconnect all clients
+            lock (clientsLock)
+            {
+                foreach (var client in clients.ToList())
+                {
+                    client.Disconnect();
+                }
+                clients.Clear();
+            }
+
+            try
+            {
+                tcpListener?.Stop();
+            }
+            catch { }
+
+            Console.WriteLine("[TCP] Chat server stopped");
+        }
+    }
+}

SubProject/ChatServer/packages.config

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="Newtonsoft.Json" version="13.0.3" targetFramework="net48" />
+</packages>