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RobotApp/Hubs/RobotHub.cs

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+using Microsoft.AspNetCore.SignalR;
+using RobotApp.Common.Shares;
+using RobotApp.VDA5050.State;
+using System.Text.Json;
+
+namespace RobotApp.Hubs
+{
+    public class RobotHub : Hub
+    {
+        // Client gọi để theo dõi robot cụ thể
+        public async Task JoinRobot(string serialNumber)
+        {
+            await Groups.AddToGroupAsync(Context.ConnectionId, serialNumber);
+            Console.WriteLine($"Client {Context.ConnectionId} joined robot group: {serialNumber}");
+        }
+
+        public async Task LeaveRobot(string serialNumber)
+        {
+            await Groups.RemoveFromGroupAsync(Context.ConnectionId, serialNumber);
+        }
+
+        // Phương thức này sẽ được gọi từ service để broadcast
+        public async Task SendState(string serialNumber, StateMsg state)
+        {
+            var json = JsonSerializer.Serialize(state, JsonOptionExtends.Write);
+            await Clients.Group(serialNumber).SendAsync("ReceiveState", json);
+        }
+    }
+}