mqtt sample

MQTTSample/MqttSubscriberApp/Program.cs

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+using MQTTnet.Client;
+using MQTTnet;
+using System.Text;
+
+namespace MqttSubscriberApp
+{
+    internal class Program
+    {
+        private static IMqttClient _mqttClient;
+        private static string CLIENT_ID = $"SubscriberClient_{Random.Shared.Next(1, 1000)}";
+        private static string SERVER_IP = "localhost";
+        private static readonly int PORT = 1883;
+        private static readonly string TOPIC = "home/kitchen/temperature";
+
+        static async Task Main(string[] args)
+        {
+            var mqttFactory = new MqttFactory();
+            _mqttClient = mqttFactory.CreateMqttClient();
+
+            var options = new MqttClientOptionsBuilder()
+                .WithClientId(CLIENT_ID)
+                .WithTcpServer(SERVER_IP, PORT)
+                .Build();
+
+            _mqttClient.ConnectedAsync += MqttClient_ConnectedAsync;
+            _mqttClient.ApplicationMessageReceivedAsync += MqttClient_ApplicationMessageReceivedAsync;
+
+            await _mqttClient.ConnectAsync(options);
+            Console.ReadLine();
+        }
+
+        private static async Task MqttClient_ApplicationMessageReceivedAsync(MqttApplicationMessageReceivedEventArgs arg)
+        {
+            var message = Encoding.UTF8.GetString(arg.ApplicationMessage.PayloadSegment);
+            Console.WriteLine($"Received message: {message}");
+        }
+
+        private static async Task MqttClient_ConnectedAsync(MqttClientConnectedEventArgs arg)
+        {
+            Console.WriteLine("Connected to broker.");
+
+            await _mqttClient.SubscribeAsync(new MqttTopicFilterBuilder()
+                .WithTopic(TOPIC)
+                .Build());
+
+            Console.WriteLine($"Subscribed to topic '{TOPIC}'");
+        }
+    }
+}