Merge branch 'ReactHosting' of file://k4fs3201n/k4bpartcenter$/Repository/Common/GroupWare into ReactHosting

2025-11-20 15:19:34 +09:00
parent 7b189f9017 cbbef7a016
commit 40b3243925
27 changed files with 2673 additions and 122 deletions
--- a/EETGW.sln
+++ b/EETGW.sln
@@ -1,7 +1,7 @@

 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio Version 17
-VisualStudioVersion = 17.14.36310.24 d17.14
+# Visual Studio Express 15 for Windows Desktop
+VisualStudioVersion = 15.0.36324.19
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "EETGW", "Project\EETGW.csproj", "{65F3E762-800C-499E-862F-A535642EC59F}"
 EndProject
@@ -44,7 +44,7 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "YARTE", "Sub\YARTE\YARTE.cs
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Console_SendMail", "Sub\Console_SendMail\Console_SendMail.csproj", "{8C94D335-7468-4964-AA24-1E3313CF7ABA}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AmkorRestfulService", "SubProject\AmkorRestfulService\AmkorRestfulService.csproj", "{58CFC90C-5068-46A2-A8DE-0E92EE9E0990}"
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "NoticeServer", "SubProject\ChatServer\NoticeServer.csproj", "{8E9A4B1C-6D5F-4E2A-9F3B-1C8D7E6A5B4F}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -168,14 +168,14 @@ Global
 		{8C94D335-7468-4964-AA24-1E3313CF7ABA}.Release|Any CPU.Build.0 = Release|Any CPU
 		{8C94D335-7468-4964-AA24-1E3313CF7ABA}.Release|x86.ActiveCfg = Release|Any CPU
 		{8C94D335-7468-4964-AA24-1E3313CF7ABA}.Release|x86.Build.0 = Release|Any CPU
-		{58CFC90C-5068-46A2-A8DE-0E92EE9E0990}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{58CFC90C-5068-46A2-A8DE-0E92EE9E0990}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{58CFC90C-5068-46A2-A8DE-0E92EE9E0990}.Debug|x86.ActiveCfg = Debug|x86
-		{58CFC90C-5068-46A2-A8DE-0E92EE9E0990}.Debug|x86.Build.0 = Debug|x86
-		{58CFC90C-5068-46A2-A8DE-0E92EE9E0990}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{58CFC90C-5068-46A2-A8DE-0E92EE9E0990}.Release|Any CPU.Build.0 = Release|Any CPU
-		{58CFC90C-5068-46A2-A8DE-0E92EE9E0990}.Release|x86.ActiveCfg = Release|x86
-		{58CFC90C-5068-46A2-A8DE-0E92EE9E0990}.Release|x86.Build.0 = Release|x86
+		{8E9A4B1C-6D5F-4E2A-9F3B-1C8D7E6A5B4F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{8E9A4B1C-6D5F-4E2A-9F3B-1C8D7E6A5B4F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{8E9A4B1C-6D5F-4E2A-9F3B-1C8D7E6A5B4F}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{8E9A4B1C-6D5F-4E2A-9F3B-1C8D7E6A5B4F}.Debug|x86.Build.0 = Debug|Any CPU
+		{8E9A4B1C-6D5F-4E2A-9F3B-1C8D7E6A5B4F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{8E9A4B1C-6D5F-4E2A-9F3B-1C8D7E6A5B4F}.Release|Any CPU.Build.0 = Release|Any CPU
+		{8E9A4B1C-6D5F-4E2A-9F3B-1C8D7E6A5B4F}.Release|x86.ActiveCfg = Release|Any CPU
+		{8E9A4B1C-6D5F-4E2A-9F3B-1C8D7E6A5B4F}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -195,7 +195,6 @@ Global
 		{CAFE5CD0-C055-4C77-9253-8D5EE9558D43} = {6C7EC99E-7367-4255-A039-EF5E8D75A2F6}
 		{3869B8C1-1290-4864-B72D-D771475F914D} = {6C7EC99E-7367-4255-A039-EF5E8D75A2F6}
 		{DB5EE9C8-EACF-4231-877E-B9DFD7A714DE} = {28105E67-9D33-4627-8E26-FCE67700622F}
-		{58CFC90C-5068-46A2-A8DE-0E92EE9E0990} = {6C7EC99E-7367-4255-A039-EF5E8D75A2F6}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {B5B1FD72-356F-4840-83E8-B070AC21C8D9}
--- a/Project/ChatClientService.cs
+++ b/Project/ChatClientService.cs
@@ -0,0 +1,283 @@
+using System;
+using System.Net.Sockets;
+using System.Text;
+using System.Threading;
+using Newtonsoft.Json;
+
+namespace Project
+{
+    /// <summary>
+    /// Background chat client service with auto-reconnect
+    /// </summary>
+    public class ChatClientService : IDisposable
+    {
+        private TcpClient tcpClient;
+        private NetworkStream stream;
+        private Thread receiveThread;
+        private Thread reconnectThread;
+        private bool isRunning;
+        private bool isConnected;
+
+        private string serverIp;
+        private int serverPort;
+        private string nickName;
+        private string employeeId;
+        private string hostName;
+        private string userGroup;
+
+        /// <summary>Connection status changed event</summary>
+        public event EventHandler<bool> ConnectionStatusChanged;
+
+        /// <summary>Message received event</summary>
+        public event EventHandler<ChatMessage> MessageReceived;
+
+        /// <summary>Connection status</summary>
+        public bool IsConnected => isConnected;
+
+        /// <summary>User nickname</summary>
+        public string NickName => nickName;
+
+        /// <summary>User employee ID</summary>
+        public string EmployeeId => employeeId;
+
+        /// <summary>User group</summary>
+        public string UserGroup => userGroup;
+
+        public ChatClientService(string serverIp, int serverPort)
+        {
+            this.serverIp = serverIp;
+            this.serverPort = serverPort;
+            this.hostName = System.Net.Dns.GetHostName();
+        }
+
+        /// <summary>
+        /// Start background service
+        /// </summary>
+        public void Start(string nickName, string employeeId, string userGroup)
+        {
+            if (isRunning)
+                return;
+
+            this.nickName = nickName;
+            this.employeeId = employeeId;
+            this.userGroup = userGroup;
+            isRunning = true;
+
+            // Start reconnect thread
+            reconnectThread = new Thread(ReconnectLoop)
+            {
+                IsBackground = true,
+                Name = "ChatReconnectThread"
+            };
+            reconnectThread.Start();
+        }
+
+        /// <summary>
+        /// Stop background service
+        /// </summary>
+        public void Stop()
+        {
+            isRunning = false;
+            Disconnect();
+
+            try
+            {
+                reconnectThread?.Join(2000);
+                receiveThread?.Join(2000);
+            }
+            catch { }
+        }
+
+        /// <summary>
+        /// Auto-reconnect loop
+        /// </summary>
+        private void ReconnectLoop()
+        {
+            while (isRunning)
+            {
+                if (!isConnected)
+                {
+                    try
+                    {
+                        Connect();
+                    }
+                    catch
+                    {
+                        // Retry after 5 seconds
+                        Thread.Sleep(5000);
+                    }
+                }
+                else
+                {
+                    Thread.Sleep(1000);
+                }
+            }
+        }
+
+        /// <summary>
+        /// Connect to server
+        /// </summary>
+        private void Connect()
+        {
+            try
+            {
+                tcpClient = new TcpClient();
+                tcpClient.Connect(serverIp, serverPort);
+                stream = tcpClient.GetStream();
+                isConnected = true;
+
+                // Notify connection status
+                ConnectionStatusChanged?.Invoke(this, true);
+
+                // Send connect message
+                var connectMsg = new ChatMessage
+                {
+                    Type = MessageType.Connect,
+                    NickName = nickName,
+                    EmployeeId = employeeId,
+                    HostName = hostName,
+                    UserGroup = userGroup,
+                    Timestamp = DateTime.Now
+                };
+                SendMessage(connectMsg);
+
+                // Start receive thread
+                receiveThread = new Thread(ReceiveLoop)
+                {
+                    IsBackground = true,
+                    Name = "ChatReceiveThread"
+                };
+                receiveThread.Start();
+            }
+            catch
+            {
+                Disconnect();
+                throw;
+            }
+        }
+
+        /// <summary>
+        /// Disconnect from server
+        /// </summary>
+        private void Disconnect()
+        {
+            if (!isConnected)
+                return;
+
+            isConnected = false;
+
+            try
+            {
+                stream?.Close();
+                tcpClient?.Close();
+            }
+            catch { }
+
+            // Notify connection status
+            ConnectionStatusChanged?.Invoke(this, false);
+        }
+
+        /// <summary>
+        /// Message receive loop
+        /// </summary>
+        private void ReceiveLoop()
+        {
+            byte[] buffer = new byte[8192];
+
+            try
+            {
+                while (isRunning && 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)
+                    {
+                        // Filter messages by group (dev can see all)
+                        // UserListResponse and system messages should always be received
+                        if (userGroup == "dev" ||
+                            message.UserGroup == userGroup ||
+                            message.Type == MessageType.Notice ||
+                            message.Type == MessageType.UserListResponse ||
+                            message.Type == MessageType.Pong)
+                        {
+                            MessageReceived?.Invoke(this, message);
+                        }
+                    }
+                }
+            }
+            catch
+            {
+                // Connection error
+            }
+            finally
+            {
+                Disconnect();
+            }
+        }
+
+        /// <summary>
+        /// Send message
+        /// </summary>
+        public bool SendMessage(ChatMessage message)
+        {
+            if (!isConnected || tcpClient == null || !tcpClient.Connected)
+                return false;
+
+            try
+            {
+                message.NickName = nickName;
+                message.UserGroup = userGroup;
+                message.Timestamp = DateTime.Now;
+
+                string jsonData = JsonConvert.SerializeObject(message);
+                byte[] data = Encoding.UTF8.GetBytes(jsonData);
+                stream.Write(data, 0, data.Length);
+                stream.Flush();
+                return true;
+            }
+            catch
+            {
+                Disconnect();
+                return false;
+            }
+        }
+
+        /// <summary>
+        /// Send chat message
+        /// </summary>
+        public bool SendChatMessage(string content)
+        {
+            var message = new ChatMessage
+            {
+                Type = MessageType.Chat,
+                Content = content
+            };
+            return SendMessage(message);
+        }
+
+        /// <summary>
+        /// Request user list
+        /// </summary>
+        public bool RequestUserList()
+        {
+            var message = new ChatMessage
+            {
+                Type = MessageType.UserListRequest
+            };
+            return SendMessage(message);
+        }
+
+        public void Dispose()
+        {
+            Stop();
+        }
+    }
+}
--- a/Project/ChatMessage.cs
+++ b/Project/ChatMessage.cs
@@ -0,0 +1,76 @@
+using System;
+
+namespace Project
+{
+    /// <summary>
+    /// Chat message type
+    /// </summary>
+    public enum MessageType
+    {
+        /// <summary>Client connect</summary>
+        Connect = 0,
+        /// <summary>Client disconnect</summary>
+        Disconnect = 1,
+        /// <summary>Normal chat message</summary>
+        Chat = 2,
+        /// <summary>Server notice</summary>
+        Notice = 3,
+        /// <summary>Whisper message</summary>
+        Whisper = 4,
+        /// <summary>User list request</summary>
+        UserListRequest = 5,
+        /// <summary>User list response</summary>
+        UserListResponse = 6,
+        /// <summary>Ping (keep alive)</summary>
+        Ping = 7,
+        /// <summary>Pong (ping response)</summary>
+        Pong = 8
+    }
+
+    /// <summary>
+    /// Chat message protocol
+    /// </summary>
+    [Serializable]
+    public class ChatMessage
+    {
+        /// <summary>Message type</summary>
+        public MessageType Type { get; set; }
+
+        /// <summary>Sender nickname</summary>
+        public string NickName { get; set; }
+
+        /// <summary>Sender employee ID (사번)</summary>
+        public string EmployeeId { get; set; }
+
+        /// <summary>Sender IP</summary>
+        public string IpAddress { get; set; }
+
+        /// <summary>Sender hostname</summary>
+        public string HostName { get; set; }
+
+        /// <summary>Message content</summary>
+        public string Content { get; set; }
+
+        /// <summary>Target employee ID (for 1:1 chat)</summary>
+        public string TargetEmployeeId { get; set; }
+
+        /// <summary>Target nickname (for whisper, null for broadcast)</summary>
+        public string TargetNickName { get; set; }
+
+        /// <summary>Send time</summary>
+        public DateTime Timestamp { get; set; }
+
+        /// <summary>User group (for filtering)</summary>
+        public string UserGroup { get; set; }
+
+        public ChatMessage()
+        {
+            Timestamp = DateTime.Now;
+        }
+
+        public override string ToString()
+        {
+            return $"[{Timestamp:HH:mm:ss}] {NickName}: {Content}";
+        }
+    }
+}
--- a/Project/Dialog/fChat.Designer.cs
+++ b/Project/Dialog/fChat.Designer.cs
@@ -0,0 +1,184 @@
+namespace Project.Dialog
+{
+    partial class fChat
+    {
+        /// <summary>
+        /// Required designer variable.
+        /// </summary>
+        private System.ComponentModel.IContainer components = null;
+
+        /// <summary>
+        /// Clean up any resources being used.
+        /// </summary>
+        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
+        protected override void Dispose(bool disposing)
+        {
+            if (disposing && (components != null))
+            {
+                components.Dispose();
+            }
+            base.Dispose(disposing);
+        }
+
+        #region Windows Form Designer generated code
+
+        /// <summary>
+        /// Required method for Designer support - do not modify
+        /// the contents of this method with the code editor.
+        /// </summary>
+        private void InitializeComponent()
+        {
+            this.components = new System.ComponentModel.Container();
+            this.txtChatDisplay = new System.Windows.Forms.TextBox();
+            this.txtInput = new System.Windows.Forms.TextBox();
+            this.btnSend = new System.Windows.Forms.Button();
+            this.lblStatus = new System.Windows.Forms.Label();
+            this.timerStatus = new System.Windows.Forms.Timer(this.components);
+            this.panelTop = new System.Windows.Forms.Panel();
+            this.panelBottom = new System.Windows.Forms.Panel();
+            this.lblRecipient = new System.Windows.Forms.Label();
+            this.cboRecipient = new System.Windows.Forms.ComboBox();
+            this.panelTop.SuspendLayout();
+            this.panelBottom.SuspendLayout();
+            this.SuspendLayout();
+            //
+            // txtChatDisplay
+            //
+            this.txtChatDisplay.BackColor = System.Drawing.Color.White;
+            this.txtChatDisplay.Dock = System.Windows.Forms.DockStyle.Fill;
+            this.txtChatDisplay.Font = new System.Drawing.Font("Consolas", 9F);
+            this.txtChatDisplay.Location = new System.Drawing.Point(0, 30);
+            this.txtChatDisplay.Multiline = true;
+            this.txtChatDisplay.Name = "txtChatDisplay";
+            this.txtChatDisplay.ReadOnly = true;
+            this.txtChatDisplay.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;
+            this.txtChatDisplay.Size = new System.Drawing.Size(500, 340);
+            this.txtChatDisplay.TabIndex = 0;
+            //
+            // txtInput
+            //
+            this.txtInput.Dock = System.Windows.Forms.DockStyle.Fill;
+            this.txtInput.Font = new System.Drawing.Font("Malgun Gothic", 9F);
+            this.txtInput.Location = new System.Drawing.Point(0, 0);
+            this.txtInput.Name = "txtInput";
+            this.txtInput.Size = new System.Drawing.Size(420, 23);
+            this.txtInput.TabIndex = 1;
+            this.txtInput.KeyDown += new System.Windows.Forms.KeyEventHandler(this.txtInput_KeyDown);
+            //
+            // btnSend
+            //
+            this.btnSend.Dock = System.Windows.Forms.DockStyle.Right;
+            this.btnSend.Location = new System.Drawing.Point(420, 0);
+            this.btnSend.Name = "btnSend";
+            this.btnSend.Size = new System.Drawing.Size(80, 30);
+            this.btnSend.TabIndex = 2;
+            this.btnSend.Text = "Send";
+            this.btnSend.UseVisualStyleBackColor = true;
+            this.btnSend.Click += new System.EventHandler(this.btnSend_Click);
+            //
+            // lblStatus
+            //
+            this.lblStatus.AutoSize = true;
+            this.lblStatus.Dock = System.Windows.Forms.DockStyle.Fill;
+            this.lblStatus.Font = new System.Drawing.Font("Malgun Gothic", 9F, System.Drawing.FontStyle.Bold);
+            this.lblStatus.ForeColor = System.Drawing.Color.Green;
+            this.lblStatus.Location = new System.Drawing.Point(5, 5);
+            this.lblStatus.Name = "lblStatus";
+            this.lblStatus.Padding = new System.Windows.Forms.Padding(5);
+            this.lblStatus.Size = new System.Drawing.Size(83, 25);
+            this.lblStatus.TabIndex = 3;
+            this.lblStatus.Text = "Connected";
+            this.lblStatus.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
+            //
+            // timerStatus
+            //
+            this.timerStatus.Enabled = true;
+            this.timerStatus.Interval = 1000;
+            this.timerStatus.Tick += new System.EventHandler(this.timerStatus_Tick);
+            //
+            // lblRecipient
+            //
+            this.lblRecipient.AutoSize = true;
+            this.lblRecipient.Dock = System.Windows.Forms.DockStyle.Left;
+            this.lblRecipient.Font = new System.Drawing.Font("Malgun Gothic", 9F);
+            this.lblRecipient.Location = new System.Drawing.Point(5, 5);
+            this.lblRecipient.Name = "lblRecipient";
+            this.lblRecipient.Padding = new System.Windows.Forms.Padding(0, 5, 5, 0);
+            this.lblRecipient.Size = new System.Drawing.Size(45, 20);
+            this.lblRecipient.TabIndex = 5;
+            this.lblRecipient.Text = "To:";
+            this.lblRecipient.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
+            //
+            // cboRecipient
+            //
+            this.cboRecipient.Dock = System.Windows.Forms.DockStyle.Left;
+            this.cboRecipient.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
+            this.cboRecipient.Font = new System.Drawing.Font("Malgun Gothic", 9F);
+            this.cboRecipient.FormattingEnabled = true;
+            this.cboRecipient.Location = new System.Drawing.Point(50, 5);
+            this.cboRecipient.Name = "cboRecipient";
+            this.cboRecipient.Size = new System.Drawing.Size(200, 23);
+            this.cboRecipient.TabIndex = 6;
+            //
+            // panelTop
+            //
+            this.panelTop.Controls.Add(this.cboRecipient);
+            this.panelTop.Controls.Add(this.lblRecipient);
+            this.panelTop.Controls.Add(this.lblStatus);
+            this.panelTop.Dock = System.Windows.Forms.DockStyle.Top;
+            this.panelTop.Location = new System.Drawing.Point(0, 0);
+            this.panelTop.Name = "panelTop";
+            this.panelTop.Padding = new System.Windows.Forms.Padding(5);
+            this.panelTop.Size = new System.Drawing.Size(500, 30);
+            this.panelTop.TabIndex = 4;
+            //
+            // panelBottom
+            //
+            this.panelBottom.Controls.Add(this.txtInput);
+            this.panelBottom.Controls.Add(this.btnSend);
+            this.panelBottom.Dock = System.Windows.Forms.DockStyle.Bottom;
+            this.panelBottom.Location = new System.Drawing.Point(0, 370);
+            this.panelBottom.Name = "panelBottom";
+            this.panelBottom.Size = new System.Drawing.Size(500, 30);
+            this.panelBottom.TabIndex = 5;
+            //
+            // fChat
+            //
+            this.AutoScaleDimensions = new System.Drawing.SizeF(7F, 12F);
+            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
+            this.ClientSize = new System.Drawing.Size(500, 400);
+            this.Controls.Add(this.txtChatDisplay);
+            this.Controls.Add(this.panelBottom);
+            this.Controls.Add(this.panelTop);
+            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.Sizable;
+            this.KeyPreview = true;
+            this.MaximizeBox = true;
+            this.MinimizeBox = true;
+            this.MinimumSize = new System.Drawing.Size(400, 300);
+            this.Name = "fChat";
+            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
+            this.Text = "Chat";
+            this.FormClosing += new System.Windows.Forms.FormClosingEventHandler(this.fChat_FormClosing);
+            this.Load += new System.EventHandler(this.fChat_Load);
+            this.panelTop.ResumeLayout(false);
+            this.panelTop.PerformLayout();
+            this.panelBottom.ResumeLayout(false);
+            this.panelBottom.PerformLayout();
+            this.ResumeLayout(false);
+            this.PerformLayout();
+
+        }
+
+        #endregion
+
+        private System.Windows.Forms.TextBox txtChatDisplay;
+        private System.Windows.Forms.TextBox txtInput;
+        private System.Windows.Forms.Button btnSend;
+        private System.Windows.Forms.Label lblStatus;
+        private System.Windows.Forms.Timer timerStatus;
+        private System.Windows.Forms.Panel panelTop;
+        private System.Windows.Forms.Panel panelBottom;
+        private System.Windows.Forms.Label lblRecipient;
+        private System.Windows.Forms.ComboBox cboRecipient;
+    }
+}
--- a/Project/Dialog/fChat.cs
+++ b/Project/Dialog/fChat.cs
@@ -0,0 +1,412 @@
+using FCOMMON;
+using System;
+using System.Drawing;
+using System.Windows.Forms;
+
+namespace Project.Dialog
+{
+    /// <summary>
+    /// User info for recipient selection
+    /// </summary>
+    public class ChatUserInfo
+    {
+        public string EmployeeId { get; set; }
+        public string NickName { get; set; }
+        public string UserGroup { get; set; }
+
+        public override string ToString()
+        {
+            return $"{NickName} ({EmployeeId})";
+        }
+    }
+
+    public partial class fChat : fBase
+    {
+        private ChatClientService chatService;
+        private string targetEmployeeId;
+        private string targetNickName;
+
+        /// <summary>
+        /// Constructor for new chat or specific recipient
+        /// </summary>
+        public fChat(ChatClientService service, string targetEmployeeId = null, string targetNickName = null)
+        {
+            InitializeComponent();
+            this.chatService = service;
+            this.targetEmployeeId = targetEmployeeId;
+            this.targetNickName = targetNickName;
+            this.KeyDown += (s, e) => { if (e.KeyCode == Keys.Escape) this.Close(); };
+        }
+
+        private void fChat_Load(object sender, EventArgs e)
+        {
+            // Subscribe to message received event
+            if (chatService != null)
+            {
+                chatService.MessageReceived += OnMessageReceived;
+            }
+
+            // Load user list for recipient selection
+            LoadUserList();
+
+            // If target is specified, set it
+            if (!string.IsNullOrEmpty(targetEmployeeId))
+            {
+                SetRecipient(targetEmployeeId, targetNickName);
+            }
+
+            // Load recent messages (if any)
+            RefreshConnectionStatus();
+
+            // Request user list from server
+            if (chatService != null && chatService.IsConnected)
+            {
+                System.Diagnostics.Debug.WriteLine("[DEBUG] Requesting user list from server...");
+                chatService.RequestUserList();
+            }
+            else
+            {
+                System.Diagnostics.Debug.WriteLine($"[DEBUG] Cannot request user list - Service: {chatService != null}, Connected: {chatService?.IsConnected}");
+            }
+        }
+
+        /// <summary>
+        /// Load user list into combobox
+        /// </summary>
+        private void LoadUserList()
+        {
+            cboRecipient.Items.Clear();
+
+            // Add placeholder
+            cboRecipient.Items.Add(new ChatUserInfo
+            {
+                EmployeeId = "",
+                NickName = "Select recipient...",
+                UserGroup = ""
+            });
+
+            // In a real implementation, this would load from server
+            // For now, user will need to type employee ID manually
+            // The server's UserListResponse should populate this
+
+            cboRecipient.SelectedIndex = 0;
+        }
+
+        /// <summary>
+        /// Set specific recipient
+        /// </summary>
+        private void SetRecipient(string employeeId, string nickName)
+        {
+            targetEmployeeId = employeeId;
+            targetNickName = nickName;
+
+            // Try to find in combobox
+            bool found = false;
+            for (int i = 0; i < cboRecipient.Items.Count; i++)
+            {
+                var user = cboRecipient.Items[i] as ChatUserInfo;
+                if (user != null && user.EmployeeId == employeeId)
+                {
+                    cboRecipient.SelectedIndex = i;
+                    found = true;
+                    break;
+                }
+            }
+
+            // If not found, add it
+            if (!found && !string.IsNullOrEmpty(employeeId))
+            {
+                var user = new ChatUserInfo
+                {
+                    EmployeeId = employeeId,
+                    NickName = nickName ?? employeeId,
+                    UserGroup = ""
+                };
+                cboRecipient.Items.Add(user);
+                cboRecipient.SelectedItem = user;
+            }
+
+            // Update form title
+            this.Text = $"Chat - {nickName ?? employeeId}";
+        }
+
+        private void fChat_FormClosing(object sender, FormClosingEventArgs e)
+        {
+            // Unsubscribe events
+            if (chatService != null)
+            {
+                chatService.MessageReceived -= OnMessageReceived;
+            }
+        }
+
+        /// <summary>
+        /// Message received event handler
+        /// </summary>
+        private void OnMessageReceived(object sender, ChatMessage message)
+        {
+            if (InvokeRequired)
+            {
+                BeginInvoke(new Action(() => OnMessageReceived(sender, message)));
+                return;
+            }
+
+            // Get current recipient from combobox
+            var selectedUser = cboRecipient.SelectedItem as ChatUserInfo;
+            string currentTargetId = selectedUser?.EmployeeId ?? targetEmployeeId;
+
+            // Filter messages - only show messages between current user and target
+            string myEmployeeId = chatService.EmployeeId;
+
+            // Show message if:
+            // 1. It's from target to me
+            // 2. It's from me to target (echo from server)
+            // 3. It's a notice (broadcast)
+            bool shouldDisplay = false;
+
+            if (message.Type == MessageType.Notice)
+            {
+                shouldDisplay = true;
+
+                // If it's a join/leave notice, refresh user list
+                if (message.Content.Contains("has joined") || message.Content.Contains("has left"))
+                {
+                    System.Diagnostics.Debug.WriteLine("[DEBUG] User joined/left, refreshing user list...");
+                    if (chatService != null && chatService.IsConnected)
+                    {
+                        chatService.RequestUserList();
+                    }
+                }
+            }
+            else if (message.Type == MessageType.UserListResponse)
+            {
+                // Handle user list response
+                HandleUserListResponse(message);
+                return;
+            }
+            else if (!string.IsNullOrEmpty(currentTargetId))
+            {
+                // From target to me
+                if (message.EmployeeId == currentTargetId && message.TargetEmployeeId == myEmployeeId)
+                {
+                    shouldDisplay = true;
+                }
+                // From me to target (echo)
+                else if (message.EmployeeId == myEmployeeId && message.TargetEmployeeId == currentTargetId)
+                {
+                    shouldDisplay = true;
+                }
+            }
+
+            if (shouldDisplay)
+            {
+                AppendMessage(message);
+            }
+        }
+
+        /// <summary>
+        /// Handle user list response from server
+        /// </summary>
+        private void HandleUserListResponse(ChatMessage message)
+        {
+            try
+            {
+                System.Diagnostics.Debug.WriteLine($"[DEBUG] UserListResponse received: {message.Content}");
+
+                // Parse user list from Content (format: "employeeId1:nickName1:userGroup1,employeeId2:nickName2:userGroup2,...")
+                if (string.IsNullOrEmpty(message.Content))
+                {
+                    System.Diagnostics.Debug.WriteLine("[DEBUG] UserListResponse content is empty");
+                    return;
+                }
+
+                cboRecipient.Items.Clear();
+
+                // Add placeholder
+                cboRecipient.Items.Add(new ChatUserInfo
+                {
+                    EmployeeId = "",
+                    NickName = "Select recipient...",
+                    UserGroup = ""
+                });
+
+                string[] users = message.Content.Split(',');
+                System.Diagnostics.Debug.WriteLine($"[DEBUG] Parsing {users.Length} users");
+
+                foreach (var userStr in users)
+                {
+                    if (string.IsNullOrWhiteSpace(userStr))
+                        continue;
+
+                    string[] parts = userStr.Split(':');
+                    System.Diagnostics.Debug.WriteLine($"[DEBUG] User parts: {string.Join(", ", parts)}");
+
+                    if (parts.Length >= 2)
+                    {
+                        string empId = parts[0].Trim();
+                        string nick = parts[1].Trim();
+
+                        System.Diagnostics.Debug.WriteLine($"[DEBUG] Processing user: {empId} - {nick}, My ID: {chatService.EmployeeId}");
+
+                        // Don't add myself
+                        if (empId != chatService.EmployeeId)
+                        {
+                            var user = new ChatUserInfo
+                            {
+                                EmployeeId = empId,
+                                NickName = nick,
+                                UserGroup = parts.Length > 2 ? parts[2].Trim() : ""
+                            };
+                            cboRecipient.Items.Add(user);
+                            System.Diagnostics.Debug.WriteLine($"[DEBUG] Added user: {user}");
+                        }
+                        else
+                        {
+                            System.Diagnostics.Debug.WriteLine($"[DEBUG] Skipped myself: {empId}");
+                        }
+                    }
+                }
+
+                System.Diagnostics.Debug.WriteLine($"[DEBUG] Total items in combo: {cboRecipient.Items.Count}");
+
+                // Restore previous selection if exists
+                if (!string.IsNullOrEmpty(targetEmployeeId))
+                {
+                    SetRecipient(targetEmployeeId, targetNickName);
+                }
+                else
+                {
+                    cboRecipient.SelectedIndex = 0;
+                }
+            }
+            catch (Exception ex)
+            {
+                System.Diagnostics.Debug.WriteLine($"[ERROR] HandleUserListResponse: {ex.Message}");
+                MessageBox.Show($"Error loading user list: {ex.Message}", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
+            }
+        }
+
+        /// <summary>
+        /// Append message to chat display
+        /// </summary>
+        private void AppendMessage(ChatMessage message)
+        {
+            string timeStr = message.Timestamp.ToString("HH:mm:ss");
+            string displayMsg = "";
+
+            switch (message.Type)
+            {
+                case MessageType.Chat:
+                    displayMsg = $"[{timeStr}] {message.NickName}: {message.Content}";
+                    break;
+
+                case MessageType.Notice:
+                    displayMsg = $"[{timeStr}] [NOTICE] {message.Content}";
+                    break;
+
+                case MessageType.Whisper:
+                    displayMsg = $"[{timeStr}] [WHISPER from {message.NickName}] {message.Content}";
+                    break;
+
+                default:
+                    return;
+            }
+
+            txtChatDisplay.AppendText(displayMsg + Environment.NewLine);
+            txtChatDisplay.ScrollToCaret();
+        }
+
+        /// <summary>
+        /// Send button click
+        /// </summary>
+        private void btnSend_Click(object sender, EventArgs e)
+        {
+            SendMessage();
+        }
+
+        /// <summary>
+        /// Input text key down (Enter to send)
+        /// </summary>
+        private void txtInput_KeyDown(object sender, KeyEventArgs e)
+        {
+            if (e.KeyCode == Keys.Enter)
+            {
+                e.SuppressKeyPress = true;
+                SendMessage();
+            }
+        }
+
+        /// <summary>
+        /// Send chat message
+        /// </summary>
+        private void SendMessage()
+        {
+            string content = txtInput.Text.Trim();
+            if (string.IsNullOrEmpty(content))
+                return;
+
+            if (chatService == null || !chatService.IsConnected)
+            {
+                MessageBox.Show("Not connected to chat server.", "Chat", MessageBoxButtons.OK, MessageBoxIcon.Warning);
+                return;
+            }
+
+            // Get target from combobox
+            var selectedUser = cboRecipient.SelectedItem as ChatUserInfo;
+            string currentTargetId = selectedUser?.EmployeeId ?? targetEmployeeId;
+
+            if (string.IsNullOrEmpty(currentTargetId))
+            {
+                MessageBox.Show("Please select a recipient.", "Chat", MessageBoxButtons.OK, MessageBoxIcon.Warning);
+                return;
+            }
+
+            // Create message with target
+            var message = new ChatMessage
+            {
+                Type = MessageType.Chat,
+                Content = content,
+                TargetEmployeeId = currentTargetId
+            };
+
+            bool sent = chatService.SendMessage(message);
+            if (sent)
+            {
+                // Note: Server will echo the message back, so we don't display it here
+                // This prevents duplicate messages
+
+                // Clear input
+                txtInput.Text = "";
+                txtInput.Focus();
+            }
+            else
+            {
+                MessageBox.Show("Failed to send message.", "Chat", MessageBoxButtons.OK, MessageBoxIcon.Error);
+            }
+        }
+
+        /// <summary>
+        /// Refresh connection status display
+        /// </summary>
+        private void RefreshConnectionStatus()
+        {
+            if (chatService != null && chatService.IsConnected)
+            {
+                lblStatus.Text = $"Connected - {chatService.NickName} ({chatService.UserGroup})";
+                lblStatus.ForeColor = Color.Green;
+            }
+            else
+            {
+                lblStatus.Text = "Disconnected";
+                lblStatus.ForeColor = Color.Red;
+            }
+        }
+
+        /// <summary>
+        /// Timer to update status periodically
+        /// </summary>
+        private void timerStatus_Tick(object sender, EventArgs e)
+        {
+            RefreshConnectionStatus();
+        }
+    }
+}
--- a/Project/Dialog/fChat.resx
+++ b/Project/Dialog/fChat.resx
@@ -0,0 +1,64 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" msdata:Ordinal="5" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <metadata name="timerStatus.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
+    <value>17, 17</value>
+  </metadata>
+</root>
--- a/Project/EETGW.csproj
+++ b/Project/EETGW.csproj
@@ -314,6 +314,10 @@
    <Compile Include="Dialog\fMsgWindow.Designer.cs">
      <DependentUpon>fMsgWindow.cs</DependentUpon>
    </Compile>
+    <Compile Include="Dialog\fChat.cs" />
+    <Compile Include="Dialog\fChat.Designer.cs">
+      <DependentUpon>fChat.cs</DependentUpon>
+    </Compile>
    <Compile Include="Dialog\fLogin.cs">
      <SubType>Form</SubType>
    </Compile>
@@ -478,6 +482,8 @@
    </Compile>
    <Compile Include="Properties\AssemblyInfo.cs" />
    <Compile Include="Pub.cs" />
+    <Compile Include="ChatMessage.cs" />
+    <Compile Include="ChatClientService.cs" />
    <Compile Include="Setting.cs" />
    <Compile Include="StateMachine\_TMDisplay.cs">
      <SubType>Form</SubType>
@@ -507,6 +513,9 @@
    <EmbeddedResource Include="Dialog\fMsgWindow.resx">
      <DependentUpon>fMsgWindow.cs</DependentUpon>
    </EmbeddedResource>
+    <EmbeddedResource Include="Dialog\fChat.resx">
+      <DependentUpon>fChat.cs</DependentUpon>
+    </EmbeddedResource>
    <EmbeddedResource Include="Dialog\fLogin.resx">
      <DependentUpon>fLogin.cs</DependentUpon>
    </EmbeddedResource>
--- a/Project/EETGW.csproj.user
+++ b/Project/EETGW.csproj.user
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <PropertyGroup>
    <PublishUrlHistory>ftp://10.131.36.205:2121/Install/GroupWare/|ftp://10.131.36.205:2121/Install/|ftp://10.131.36.205/Install/|게시\</PublishUrlHistory>
--- a/Project/Properties/Settings.Designer.cs
+++ b/Project/Properties/Settings.Designer.cs
@@ -12,7 +12,7 @@ namespace Project.Properties {
    
    
    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
-    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.VisualStudio.Editors.SettingsDesigner.SettingsSingleFileGenerator", "17.9.0.0")]
+    [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())));
--- a/Project/Properties/Settings.settings
+++ b/Project/Properties/Settings.settings
@@ -4,7 +4,7 @@
  <Settings>
    <Setting Name="gwcs" Type="(Connection string)" Scope="Application">
      <DesignTimeValue Profile="(Default)">&lt;?xml version="1.0" encoding="utf-16"?&gt;
-&lt;SerializableConnectionString xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"&gt;
+&lt;SerializableConnectionString xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"&gt;
  &lt;ConnectionString&gt;Data Source=K4FASQL.kr.ds.amkor.com,50150;Initial Catalog=EE;Persist Security Info=True;User ID=eeadm;Password=uJnU8a8q&amp;amp;DJ+ug-D;Encrypt=False;TrustServerCertificate=True&lt;/ConnectionString&gt;
  &lt;ProviderName&gt;System.Data.SqlClient&lt;/ProviderName&gt;
 &lt;/SerializableConnectionString&gt;</DesignTimeValue>
@@ -12,7 +12,7 @@
    </Setting>
    <Setting Name="CS" Type="(Connection string)" Scope="Application">
      <DesignTimeValue Profile="(Default)">&lt;?xml version="1.0" encoding="utf-16"?&gt;
-&lt;SerializableConnectionString xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"&gt;
+&lt;SerializableConnectionString xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"&gt;
  &lt;ConnectionString&gt;Data Source=K4FASQL.kr.ds.amkor.com,50150;Initial Catalog=EE;Persist Security Info=True;User ID=eeadm;Password=uJnU8a8q&amp;amp;DJ+ug-D;Encrypt=False;TrustServerCertificate=True&lt;/ConnectionString&gt;
  &lt;ProviderName&gt;System.Data.SqlClient&lt;/ProviderName&gt;
 &lt;/SerializableConnectionString&gt;</DesignTimeValue>
--- a/Project/Pub.cs
+++ b/Project/Pub.cs
@@ -299,7 +299,7 @@ namespace Project
            }

        }
-        public static void CheckNRegister3(string prgmName, string develop, string prgmVersion)
+        public static void CheckNRegister5(string prgmName, string develop, string prgmVersion,string mcid, string remark)
        {
            if (prgmName.Length > 50) prgmName = prgmName.Substring(0, 50); //길이제한
            var task = Task.Factory.StartNew(() =>
@@ -345,7 +345,7 @@ namespace Project

                    SqlConnection conn = new SqlConnection(Properties.Settings.Default.CS);// "Data Source=K4FASQL.kr.ds.amkor.com,50150;Initial Catalog=EE;Persist Security Info=True;User ID=eeadm;Password=uJnU8a8q&DJ+ug-D!" ;
                    conn.Open();
-                    string ProcName = "AddPrgmUser3";
+                    string ProcName = "AddPrgmUser5";
                    SqlCommand cmd = new SqlCommand(ProcName, conn);
                    cmd.CommandType = CommandType.StoredProcedure;

@@ -373,7 +373,13 @@ namespace Project
                    param = cmd.Parameters.Add("@hostname", SqlDbType.NVarChar, 100);
                    param.Value = fullname;

-                    cmd.ExecuteNonQuery();
+                    param = cmd.Parameters.Add("@mcid", SqlDbType.NVarChar, 10);
+                    param.Value = mcid;
+
+                    param = cmd.Parameters.Add("@remark", SqlDbType.NVarChar, 255);
+                    param.Value = remark;
+
+                    var cnt = cmd.ExecuteNonQuery();
                    conn.Close();
                }
                catch (Exception ex)
--- a/Project/app.config
+++ b/Project/app.config
@@ -3,16 +3,26 @@
  <configSections>
                  </configSections>
  <connectionStrings>
-    <add name="Project.Properties.Settings.gwcs" connectionString="Data Source=K4FASQL.kr.ds.amkor.com,50150;Initial Catalog=EE;Persist Security Info=True;User ID=eeadm;Password=uJnU8a8q&amp;DJ+ug-D;Encrypt=False;TrustServerCertificate=True" providerName="System.Data.SqlClient" />
-    <add name="EEEntities" connectionString="metadata=res://*/Model1.csdl|res://*/Model1.ssdl|res://*/Model1.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=K4FASQL.kr.ds.amkor.com,50150;initial catalog=EE;persist security info=True;user id=eeadm;password=uJnU8a8q&amp;DJ+ug-D!;MultipleActiveResultSets=True;App=EntityFramework&quot;TrustServerCertificate=True" providerName="System.Data.EntityClient" />
-    <add name="EEEntities1" connectionString="metadata=res://*/ModelMain.csdl|res://*/ModelMain.ssdl|res://*/ModelMain.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=K4FASQL.kr.ds.amkor.com,50150;initial catalog=EE;user id=eeadm;password=uJnU8a8q&amp;DJ+ug-D!;connect timeout=30;encrypt=False;trustservercertificate=True;MultipleActiveResultSets=True;App=EntityFramework&quot;" providerName="System.Data.EntityClient" />
-    <add name="EEEntitiesMain" connectionString="metadata=res://*/AdoNetEFMain.csdl|res://*/AdoNetEFMain.ssdl|res://*/AdoNetEFMain.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=K4FASQL.kr.ds.amkor.com,50150;initial catalog=EE;user id=eeadm;password=uJnU8a8q&amp;DJ+ug-D!;connect timeout=30;encrypt=False;trustservercertificate=True;MultipleActiveResultSets=True;App=EntityFramework&quot;" providerName="System.Data.EntityClient" />
-    <add name="S1ACCESS300Entities" connectionString="metadata=res://*/Model1.csdl|res://*/Model1.ssdl|res://*/Model1.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=10.141.18.50;initial catalog=S1ACCESS300;persist security info=True;user id=amkoruser;password=AmkorUser!;MultipleActiveResultSets=True;App=EntityFramework&quot;TrustServerCertificate=True" providerName="System.Data.EntityClient" />
-    <add name="EEEntitiesPurchase" connectionString="metadata=res://*/ModelPurchase.csdl|res://*/ModelPurchase.ssdl|res://*/ModelPurchase.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=K4FASQL.kr.ds.amkor.com,50150;initial catalog=EE;persist security info=True;user id=eeadm;password=uJnU8a8q&amp;DJ+ug-D!;MultipleActiveResultSets=True;App=EntityFramework&quot;TrustServerCertificate=True" providerName="System.Data.EntityClient" />
-    <add name="EEEntitiesCommon" connectionString="metadata=res://*/ModelCommon.csdl|res://*/ModelCommon.ssdl|res://*/ModelCommon.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=K4FASQL.kr.ds.amkor.com,50150;initial catalog=EE;persist security info=True;user id=eeadm;password=uJnU8a8q&amp;DJ+ug-D!;MultipleActiveResultSets=True;App=EntityFramework&quot;TrustServerCertificate=True" providerName="System.Data.EntityClient" />
-    <add name="EEEntitiesJobreport" connectionString="metadata=res://*/ModelJobreport.csdl|res://*/ModelJobreport.ssdl|res://*/ModelJobreport.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=K4FASQL.kr.ds.amkor.com,50150;initial catalog=EE;persist security info=True;user id=eeadm;password=uJnU8a8q&amp;DJ+ug-D!;MultipleActiveResultSets=True;App=EntityFramework&quot;TrustServerCertificate=True" providerName="System.Data.EntityClient" />
-    <add name="EEEntitiesProject" connectionString="metadata=res://*/ModelProject.csdl|res://*/ModelProject.ssdl|res://*/ModelProject.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=K4FASQL.kr.ds.amkor.com,50150;initial catalog=EE;persist security info=True;user id=eeadm;password=uJnU8a8q&amp;DJ+ug-D!;MultipleActiveResultSets=True;App=EntityFramework&quot;TrustServerCertificate=True" providerName="System.Data.EntityClient" />
-    <add name="Project.Properties.Settings.CS" connectionString="Data Source=K4FASQL.kr.ds.amkor.com,50150;Initial Catalog=EE;Persist Security Info=True;User ID=eeadm;Password=uJnU8a8q&amp;DJ+ug-D;Encrypt=False;TrustServerCertificate=True" providerName="System.Data.SqlClient" />
+    <add name="Project.Properties.Settings.gwcs" connectionString="Data Source=K4FASQL.kr.ds.amkor.com,50150;Initial Catalog=EE;Persist Security Info=True;User ID=eeadm;Password=uJnU8a8q&amp;DJ+ug-D;Encrypt=False;TrustServerCertificate=True"
+      providerName="System.Data.SqlClient" />
+    <add name="EEEntities" connectionString="metadata=res://*/Model1.csdl|res://*/Model1.ssdl|res://*/Model1.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=K4FASQL.kr.ds.amkor.com,50150;initial catalog=EE;persist security info=True;user id=eeadm;password=uJnU8a8q&amp;DJ+ug-D!;MultipleActiveResultSets=True;App=EntityFramework&quot;TrustServerCertificate=True"
+      providerName="System.Data.EntityClient" />
+    <add name="EEEntities1" connectionString="metadata=res://*/ModelMain.csdl|res://*/ModelMain.ssdl|res://*/ModelMain.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=K4FASQL.kr.ds.amkor.com,50150;initial catalog=EE;user id=eeadm;password=uJnU8a8q&amp;DJ+ug-D!;connect timeout=30;encrypt=False;trustservercertificate=True;MultipleActiveResultSets=True;App=EntityFramework&quot;"
+      providerName="System.Data.EntityClient" />
+    <add name="EEEntitiesMain" connectionString="metadata=res://*/AdoNetEFMain.csdl|res://*/AdoNetEFMain.ssdl|res://*/AdoNetEFMain.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=K4FASQL.kr.ds.amkor.com,50150;initial catalog=EE;user id=eeadm;password=uJnU8a8q&amp;DJ+ug-D!;connect timeout=30;encrypt=False;trustservercertificate=True;MultipleActiveResultSets=True;App=EntityFramework&quot;"
+      providerName="System.Data.EntityClient" />
+    <add name="S1ACCESS300Entities" connectionString="metadata=res://*/Model1.csdl|res://*/Model1.ssdl|res://*/Model1.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=10.141.18.50;initial catalog=S1ACCESS300;persist security info=True;user id=amkoruser;password=AmkorUser!;MultipleActiveResultSets=True;App=EntityFramework&quot;TrustServerCertificate=True"
+      providerName="System.Data.EntityClient" />
+    <add name="EEEntitiesPurchase" connectionString="metadata=res://*/ModelPurchase.csdl|res://*/ModelPurchase.ssdl|res://*/ModelPurchase.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=K4FASQL.kr.ds.amkor.com,50150;initial catalog=EE;persist security info=True;user id=eeadm;password=uJnU8a8q&amp;DJ+ug-D!;MultipleActiveResultSets=True;App=EntityFramework&quot;TrustServerCertificate=True"
+      providerName="System.Data.EntityClient" />
+    <add name="EEEntitiesCommon" connectionString="metadata=res://*/ModelCommon.csdl|res://*/ModelCommon.ssdl|res://*/ModelCommon.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=K4FASQL.kr.ds.amkor.com,50150;initial catalog=EE;persist security info=True;user id=eeadm;password=uJnU8a8q&amp;DJ+ug-D!;MultipleActiveResultSets=True;App=EntityFramework&quot;TrustServerCertificate=True"
+      providerName="System.Data.EntityClient" />
+    <add name="EEEntitiesJobreport" connectionString="metadata=res://*/ModelJobreport.csdl|res://*/ModelJobreport.ssdl|res://*/ModelJobreport.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=K4FASQL.kr.ds.amkor.com,50150;initial catalog=EE;persist security info=True;user id=eeadm;password=uJnU8a8q&amp;DJ+ug-D!;MultipleActiveResultSets=True;App=EntityFramework&quot;TrustServerCertificate=True"
+      providerName="System.Data.EntityClient" />
+    <add name="EEEntitiesProject" connectionString="metadata=res://*/ModelProject.csdl|res://*/ModelProject.ssdl|res://*/ModelProject.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=K4FASQL.kr.ds.amkor.com,50150;initial catalog=EE;persist security info=True;user id=eeadm;password=uJnU8a8q&amp;DJ+ug-D!;MultipleActiveResultSets=True;App=EntityFramework&quot;TrustServerCertificate=True"
+      providerName="System.Data.EntityClient" />
+    <add name="Project.Properties.Settings.CS" connectionString="Data Source=K4FASQL.kr.ds.amkor.com,50150;Initial Catalog=EE;Persist Security Info=True;User ID=eeadm;Password=uJnU8a8q&amp;DJ+ug-D;Encrypt=False;TrustServerCertificate=True"
+      providerName="System.Data.SqlClient" />
  </connectionStrings>
  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
--- a/Project/fMain.Designer.cs
+++ b/Project/fMain.Designer.cs
@@ -41,6 +41,7 @@
            this.toolStripStatusLabel1 = new System.Windows.Forms.ToolStripStatusLabel();
            this.sbLoginUseTime = new System.Windows.Forms.ToolStripStatusLabel();
            this.sbWeb = new System.Windows.Forms.ToolStripStatusLabel();
+            this.sbChat = new System.Windows.Forms.ToolStripStatusLabel();
            this.menuStrip1 = new System.Windows.Forms.MenuStrip();
            this.btSetting = new System.Windows.Forms.ToolStripMenuItem();
            this.로그인ToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
@@ -191,7 +192,8 @@
            this.sbLogin,
            this.toolStripStatusLabel1,
            this.sbLoginUseTime,
-            this.sbWeb});
+            this.sbWeb,
+            this.sbChat});
            this.statusStrip1.Location = new System.Drawing.Point(1, 622);
            this.statusStrip1.Name = "statusStrip1";
            this.statusStrip1.Size = new System.Drawing.Size(1094, 22);
@@ -228,6 +230,15 @@
            this.sbWeb.Size = new System.Drawing.Size(31, 17);
            this.sbWeb.Text = "WEB";
            // 
+            // sbChat
+            // 
+            this.sbChat.ForeColor = System.Drawing.Color.Gray;
+            this.sbChat.IsLink = true;
+            this.sbChat.Name = "sbChat";
+            this.sbChat.Size = new System.Drawing.Size(42, 17);
+            this.sbChat.Text = "Notice";
+            this.sbChat.Click += new System.EventHandler(this.sbChat_Click);
+            // 
            // menuStrip1
            // 
            this.menuStrip1.Font = new System.Drawing.Font("맑은 고딕", 10F);
@@ -1343,6 +1354,7 @@
        private System.Windows.Forms.ToolStripSeparator toolStripMenuItem17;
        private System.Windows.Forms.ToolStripMenuItem webview2TestToolStripMenuItem;
        private System.Windows.Forms.ToolStripStatusLabel sbWeb;
+        private System.Windows.Forms.ToolStripStatusLabel sbChat;
        private System.Windows.Forms.ToolStripSeparator toolStripMenuItem18;
    }
 }
--- a/Project/fMain.cs
+++ b/Project/fMain.cs
@@ -20,11 +20,20 @@ namespace Project
        string SearchKey = string.Empty;
        private IDisposable webApp;
        bool webok = false;
+        private ChatClientService chatService;
+        private System.Windows.Forms.Timer chatBlinkTimer;
+        private bool chatHasNewMessage = false;
+        private Dictionary<string, string> chatMessageSenders = new Dictionary<string, string>(); // employeeId -> nickName


        public fMain()
        {
            InitializeComponent();
+
+            // Initialize chat blink timer
+            chatBlinkTimer = new System.Windows.Forms.Timer();
+            chatBlinkTimer.Interval = 500; // 500ms blink
+            chatBlinkTimer.Tick += ChatBlinkTimer_Tick;
            this.KeyDown += (s1, e1) =>
            {
                if (e1.KeyCode == Keys.F12) btSetting.PerformClick();
@@ -93,6 +102,10 @@ namespace Project
                }
            }

+            // Stop chat service
+            chatService?.Stop();
+            chatBlinkTimer?.Stop();
+
            FCOMMON.Pub.log.Add("Program Close");
            FCOMMON.Pub.log.Flush();
        }
@@ -193,13 +206,17 @@ namespace Project

            Func_Login();

+            // Start chat service after login
+            StartChatService();
+
            ///즐겨찾기 목록 갱신
            Update_FavoriteSite();

            UpdateControls();

            //사용기록추적
-            Pub.CheckNRegister3(Application.ProductName, "chi", Application.ProductVersion);
+            var remark = $"{FCOMMON.info.Login.gcode}|{FCOMMON.info.Login.dept}";
+            Pub.CheckNRegister5(Application.ProductName, "chi", Application.ProductVersion, FCOMMON.info.Login.no, remark);
        }

        void Update_FavoriteSite()
@@ -1561,5 +1578,211 @@ namespace Project

            }
        }
+
+        #region Chat Functions
+
+        /// <summary>
+        /// Start chat service after login
+        /// </summary>
+        private void StartChatService()
+        {
+            try
+            {
+                // Get user info
+                string nickName = FCOMMON.info.Login.nameK ?? "Unknown";
+                string employeeId = FCOMMON.info.Login.no ?? "Unknown";
+                string userGroup = FCOMMON.info.Login.gcode ?? "default";
+
+                // Initialize chat service
+                //var chatServerIP = "127.0.0.1";// : "10.131.11.45";
+                var chatServerIP = "10.131.11.45";
+                chatService = new ChatClientService(chatServerIP, 5000);
+                chatService.ConnectionStatusChanged += ChatService_ConnectionStatusChanged;
+                chatService.MessageReceived += ChatService_MessageReceived;
+
+                // Start background service
+                chatService.Start(nickName, employeeId, userGroup);
+
+                FCOMMON.Pub.log.AddI($"Chat service started: {nickName} ({employeeId}, {userGroup})");
+            }
+            catch (Exception ex)
+            {
+                FCOMMON.Pub.log.AddE($"Failed to start chat service: {ex.Message}");
+            }
+        }
+
+        /// <summary>
+        /// Chat connection status changed
+        /// </summary>
+        private void ChatService_ConnectionStatusChanged(object sender, bool isConnected)
+        {
+            if (InvokeRequired)
+            {
+                BeginInvoke(new Action(() => ChatService_ConnectionStatusChanged(sender, isConnected)));
+                return;
+            }
+
+            if (isConnected)
+            {
+                sbChat.ForeColor = Color.Green;
+                sbChat.Text = "Notice ●";
+            }
+            else
+            {
+                sbChat.ForeColor = Color.Gray;
+                sbChat.Text = "Notice ○";
+            }
+        }
+
+        /// <summary>
+        /// Chat message received
+        /// </summary>
+        private void ChatService_MessageReceived(object sender, ChatMessage message)
+        {
+            if (InvokeRequired)
+            {
+                BeginInvoke(new Action(() => ChatService_MessageReceived(sender, message)));
+                return;
+            }
+
+            // Track message senders (only messages directed to me)
+            string myEmployeeId = chatService.EmployeeId;
+            if ((message.Type == MessageType.Chat || message.Type == MessageType.Whisper) &&
+                !string.IsNullOrEmpty(message.EmployeeId) &&
+                message.EmployeeId != myEmployeeId &&
+                message.TargetEmployeeId == myEmployeeId)
+            {
+                // Add or update sender
+                if (!chatMessageSenders.ContainsKey(message.EmployeeId))
+                {
+                    chatMessageSenders[message.EmployeeId] = message.NickName ?? message.EmployeeId;
+                }
+
+                // Start blinking
+                chatHasNewMessage = true;
+                chatBlinkTimer.Start();
+            }
+        }
+
+        /// <summary>
+        /// Chat blink timer tick
+        /// </summary>
+        private void ChatBlinkTimer_Tick(object sender, EventArgs e)
+        {
+            if (!chatHasNewMessage)
+            {
+                chatBlinkTimer.Stop();
+                sbChat.ForeColor = chatService?.IsConnected == true ? Color.Green : Color.Gray;
+                return;
+            }
+
+            // Toggle color
+            sbChat.ForeColor = sbChat.ForeColor == Color.Red ? Color.Green : Color.Red;
+        }
+
+        /// <summary>
+        /// sbChat status label click event
+        /// </summary>
+        private void sbChat_Click(object sender, EventArgs e)
+        {
+            // Stop blinking
+            chatHasNewMessage = false;
+            chatBlinkTimer.Stop();
+            sbChat.ForeColor = chatService?.IsConnected == true ? Color.Green : Color.Gray;
+
+            // Show chat dialog
+            if (chatService == null)
+            {
+                MessageBox.Show("Chat service is not running.", "Chat", MessageBoxButtons.OK, MessageBoxIcon.Warning);
+                return;
+            }
+
+            // If there are senders who sent messages, show selection dialog
+            if (chatMessageSenders.Count > 0)
+            {
+                // Create simple selection form
+                using (var selectForm = new Form())
+                {
+                    selectForm.Text = "Select Sender";
+                    selectForm.Size = new Size(400, 300);
+                    selectForm.StartPosition = FormStartPosition.CenterParent;
+                    selectForm.FormBorderStyle = FormBorderStyle.FixedDialog;
+                    selectForm.MaximizeBox = false;
+                    selectForm.MinimizeBox = false;
+
+                    var listBox = new ListBox
+                    {
+                        Dock = DockStyle.Fill,
+                        Font = new Font("Malgun Gothic", 10)
+                    };
+
+                    var buttonPanel = new Panel
+                    {
+                        Dock = DockStyle.Bottom,
+                        Height = 50
+                    };
+
+                    var btnOk = new Button
+                    {
+                        Text = "Open Chat",
+                        DialogResult = DialogResult.OK,
+                        Size = new Size(100, 30),
+                        Location = new Point(140, 10)
+                    };
+
+                    var btnNew = new Button
+                    {
+                        Text = "New Chat",
+                        DialogResult = DialogResult.Retry,
+                        Size = new Size(100, 30),
+                        Location = new Point(250, 10)
+                    };
+
+                    buttonPanel.Controls.Add(btnOk);
+                    buttonPanel.Controls.Add(btnNew);
+
+                    selectForm.Controls.Add(listBox);
+                    selectForm.Controls.Add(buttonPanel);
+                    selectForm.AcceptButton = btnOk;
+
+                    // Populate list with senders
+                    foreach (var sender2 in chatMessageSenders)
+                    {
+                        listBox.Items.Add(new { EmployeeId = sender2.Key, NickName = sender2.Value, Display = $"{sender2.Value} ({sender2.Key})" });
+                    }
+                    listBox.DisplayMember = "Display";
+
+                    if (listBox.Items.Count > 0)
+                        listBox.SelectedIndex = 0;
+
+                    var result = selectForm.ShowDialog(this);
+
+                    if (result == DialogResult.OK && listBox.SelectedItem != null)
+                    {
+                        // Open chat with selected sender
+                        dynamic selected = listBox.SelectedItem;
+                        var chatForm = new Dialog.fChat(chatService, selected.EmployeeId, selected.NickName);
+                        chatForm.Show();
+
+                        // Remove from senders list (chat opened)
+                        chatMessageSenders.Remove(selected.EmployeeId);
+                    }
+                    else if (result == DialogResult.Retry)
+                    {
+                        // Open new chat (user will select recipient in chat window)
+                        var chatForm = new Dialog.fChat(chatService);
+                        chatForm.Show();
+                    }
+                }
+            }
+            else
+            {
+                // No senders, open new chat
+                var chatForm = new Dialog.fChat(chatService);
+                chatForm.Show();
+            }
+        }
+
+        #endregion
    }
 }
--- a/Project/fMain.resx
+++ b/Project/fMain.resx
@@ -184,16 +184,16 @@
  <data name="mn_purchase.Image" type="System.Drawing.Bitmap, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
    <value>
        iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABGdBTUEAAK/INwWK6QAAABl0RVh0U29m
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-        s/geQqEQTk9P4Xa7Ybfbv/Kq1SooyuUySqUSisUiCoUCstksUqkULi8vEY1GcXFxgWAwyHrn8znG4zEs
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-        dDrNemKxGFqtFpvIYDB8oSuxvW5ubnB/f49MJsPd3t4iHo9zlHx2dsbRNTweD0fJVquVC4fDbP+Dg4PP
-        K4FcLodGo8Ey6Pf7LAPqTMntdnvlTATx9PRE3bG3t/dxJUBxdXWF6XSKfD4PkjSXTCapE0fHJWFxlHx0
-        dMR5vV5KJpTfvJUAadTUajV0u11QMnWORCJoNptUkDmTVVCv16FUKn++EqAIBAI0aTidTthsNpo0SNI4
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-        VSoVtre3QchwuVzsGZNe8Pn83prAEjqdjoW1u7v7agKhUCjd2NigZHL9U19r+neA9wvhROqXtIFlogAA
+        dHdhcmUAQWRvYmUgSW1hZ2VSZWFkeXHJZTwAAAIwSURBVDhPpZLPahpRGMVdddX3aJ9gXqCv0ZVgkAGJ
+        ozEqMUpAExUlE2UwziQhZtRANMRoxP+g+SeKi6BCgkJM0K66EoUiSk+5FyJYSwPt4jBwued3vu/cUQBQ
+        /I+WDt6TLMs4OjqCKIoQBOGr4u7uDkQ3Nzcol8solUrI5/PIZDJIpVK4uLhALBbD6ekpTk5O6N3pdIrB
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+        breLq6sreicej6PdbtOJXC7Xl3kHxWIR9/f3SKfTTKVSwfn5OUPM4XCYIWtIksQQs8/nYyKRCN3fbrd/
+        ngOy2SyazSbt4Pn5mXZAkon58fFxnhwOh/Hw8EDSYbVaP84BRIlEAuPxGLlcDrIsM8lkkiQxZFye5xli
+        3tnZYQ4ODogZb745IBaLWer1OjqdDoiZJJ+dnaHVahEgTZYkCY1GAyaT6ecSgCgUCpGmsb+/D7/fT5qG
+        2+2Gw+HA1tYWbDYbLi8vsba29mfAezIajR/0ej1WV1e/LwCOj48/SZIUDAQCpGl4vV44nU7SNE3d2NjA
+        +vo6dDod3Z1l2fECQBRFC/nu7e1pPR7Pi9Pp1P6eznGcVqPRvLAsq11ZWfmxABAEwcLzPH2uWq2GaDRK
+        mzabzTAYDOA4DsFgkP7GgiBAqVR2FwBv2t7epmVtbm4uTaBWq7UqlYqY50+4BPgX/QLhROqXAnK3iwAA
        AABJRU5ErkJggg==
 </value>
  </data>
@@ -254,34 +254,34 @@
  <data name="휴가관리ToolStripMenuItem.Image" type="System.Drawing.Bitmap, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
    <value>
        iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABGdBTUEAAK/INwWK6QAAABl0RVh0U29m
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  </data>
  <metadata name="$this.TrayHeight" type="System.Int32, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
--- a/SubProject/AmkorRestfulService
+++ b/SubProject/AmkorRestfulService
--- a/SubProject/ChatServer/App.config
+++ b/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>
--- a/SubProject/ChatServer/ChatClient.cs
+++ b/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})";
+        }
+    }
+}
--- a/SubProject/ChatServer/ChatMessage.cs
+++ b/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 $"[{Timestamp:HH:mm:ss}] {NickName}: {Content}";
+        }
+    }
+}
--- a/SubProject/ChatServer/NoticeServer.csproj
+++ b/SubProject/ChatServer/NoticeServer.csproj
@@ -0,0 +1,73 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(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>
--- a/SubProject/ChatServer/NoticeService.cs
+++ b/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";
+        }
+    }
+}
--- a/SubProject/ChatServer/Program.cs
+++ b/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");
+        }
+    }
+}
--- a/SubProject/ChatServer/Properties/AssemblyInfo.cs
+++ b/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")]
--- a/SubProject/ChatServer/Properties/Settings.Designer.cs
+++ b/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;
+            }
+        }
+    }
+}
--- a/SubProject/ChatServer/Properties/Settings.settings
+++ b/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>
--- a/SubProject/ChatServer/TcpChatServer.cs
+++ b/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");
+        }
+    }
+}
--- a/SubProject/ChatServer/packages.config
+++ b/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>