add chatserver & client

2025-11-12 13:57:13 +09:00
parent e19b404580
commit d977c9da83
26 changed files with 2662 additions and 118 deletions
--- 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/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();
        }
@@ -193,6 +206,9 @@ namespace Project

            Func_Login();

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

@@ -1558,8 +1574,214 @@ namespace Project
                    fdashboard.RefreshView();
                    Console.WriteLine(  "view update");
                }
-                    
+
            }
        }
+
+        #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 @@
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@@ -254,34 +254,34 @@
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