first commit

Assets/Script/mqtt/MqttClientController.cs

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+using UnityEngine;
+using MQTTnet;
+using MQTTnet.Client;
+using System.Threading.Tasks;
+using System.Text;
+
+public class MqttClientController : MonoBehaviour
+{
+    public string mqttBrokerAddress = "broker.hivemq.com";
+    public int mqttPort = 1883;
+    public IMqttClient mqttClient { get; private set; }
+    public bool IsConnected => mqttClient?.IsConnected ?? false;
+
+    async void Start()
+    {
+        var factory = new MqttFactory();
+        mqttClient = factory.CreateMqttClient();
+
+        var options = new MqttClientOptionsBuilder()
+            .WithClientId("UnityClient")
+            .WithTcpServer(mqttBrokerAddress, mqttPort)
+            .WithCleanSession()
+            .Build();
+
+        mqttClient.ConnectedAsync += async e =>
+        {
+            Debug.Log("Connected to MQTT Broker.");
+            await Task.CompletedTask;
+        };
+
+        mqttClient.DisconnectedAsync += async e =>
+        {
+            Debug.Log("Disconnected from MQTT Broker.");
+            await Task.CompletedTask;
+        };
+
+        try
+        {
+            await mqttClient.ConnectAsync(options);
+        }
+        catch (System.Exception ex)
+        {
+            Debug.LogError($"MQTT connection failed: {ex.Message}");
+        }
+    }
+}

Assets/Script/mqtt/MqttClientController.cs.meta

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+  externalObjects: {}
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+  defaultReferences: []
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Assets/Script/mqtt/MqttOJ.cs

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+using MQTTnet;
+using MQTTnet.Protocol;
+using UnityEngine;
+
+public class MqttOJ : MonoBehaviour
+{
+    public MqttClientController mqttClientController;
+    public string topic = "unity/position";
+
+    void Update()
+    {
+        if (mqttClientController != null && mqttClientController.IsConnected)
+        {
+            Vector3 position = transform.position;
+            string message = JsonUtility.ToJson(position);
+
+            var mqttMessage = new MqttApplicationMessageBuilder()
+                .WithTopic(topic)
+                .WithPayload(message)
+                .WithQualityOfServiceLevel(MqttQualityOfServiceLevel.ExactlyOnce)
+                .Build();
+
+            mqttClientController.mqttClient.PublishAsync(mqttMessage);
+        }
+        else
+        {
+            //Debug.LogWarning("MQTT client is not connected. Skipping publish.");
+        }
+    }
+}

Assets/Script/mqtt/MqttOJ.cs.meta

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Assets/Script/mqtt/MqttReceiver.cs

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+using MQTTnet;
+using MQTTnet.Client;
+using System;
+using System.Threading.Tasks;
+using UnityEngine;
+
+public class MqttUnityClient : MonoBehaviour
+{
+    private IMqttClient _mqttClient;
+
+    private async void Start()
+    {
+        await ConnectAsync();
+        // Đăng ký chủ đề để nhận tin nhắn
+        await _mqttClient.SubscribeAsync(new MqttTopicFilterBuilder().WithTopic("unity/topic").Build());
+    }
+
+    private async Task ConnectAsync()
+    {
+        var factory = new MqttFactory();
+        _mqttClient = factory.CreateMqttClient();
+
+        var options = new MqttClientOptionsBuilder()
+            .WithClientId("UnityClient")
+            .WithTcpServer("broker.hivemq.com", 1883)
+            .WithCleanSession()
+            .Build();
+
+        _mqttClient.ApplicationMessageReceivedAsync += e =>
+        {
+            // Xử lý tin nhắn nhận được
+            var message = System.Text.Encoding.UTF8.GetString(e.ApplicationMessage.PayloadSegment);
+            Debug.Log($"Received: {message}");
+            return Task.CompletedTask;
+        };
+
+        await _mqttClient.ConnectAsync(options);
+    }
+
+    public async Task PublishAsync(string topic, string payload)
+    {
+        var message = new MqttApplicationMessageBuilder()
+            .WithTopic(topic)
+            .WithPayload(payload)
+            .WithQualityOfServiceLevel(MQTTnet.Protocol.MqttQualityOfServiceLevel.AtMostOnce)
+            .Build();
+
+        if (_mqttClient.IsConnected)
+        {
+            await _mqttClient.PublishAsync(message);
+            Debug.Log($"Published: {payload} to {topic}");
+        }
+    }
+}

Assets/Script/mqtt/MqttReceiver.cs.meta

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