初始化

IotMqttServer/IotMqttServer.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="MQTTnet" Version="5.0.1.1416" />
+    <PackageReference Include="MQTTnet.Server" Version="5.0.1.1416" />
+  </ItemGroup>
+
+</Project>

IotMqttServer/Program.cs

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+using MQTTnet.Protocol;
+using MQTTnet.Server;
+
+namespace IotMqttServer
+{
+    internal class Program
+    {
+        static async Task Main(string[] args)
+        {
+            var mqttServerFactory = new MqttServerFactory();
+
+            var mqttServerOptions = new MqttServerOptionsBuilder().WithDefaultEndpoint().Build();
+
+            using (var mqttServer = mqttServerFactory.CreateMqttServer(mqttServerOptions))
+            {
+                // Setup connection validation before starting the server so that there is
+                // no change to connect without valid credentials.
+                mqttServer.ValidatingConnectionAsync += e =>
+                {
+                    //if (e.ClientId != "ValidClientId")
+                    //{
+                    //    e.ReasonCode = MqttConnectReasonCode.ClientIdentifierNotValid;
+                    //}
+
+                    //if (e.UserName != "ValidUser")
+                    //{
+                    //    e.ReasonCode = MqttConnectReasonCode.BadUserNameOrPassword;
+                    //}
+
+                    //if (e.Password != "SecretPassword")
+                    //{
+                    //    e.ReasonCode = MqttConnectReasonCode.BadUserNameOrPassword;
+                    //}
+
+                    return Task.CompletedTask;
+                };
+
+                mqttServer.ClientDisconnectedAsync += MqttServer_ClientDisconnectedAsync;
+                mqttServer.ClientConnectedAsync += MqttServer_ClientConnectedAsync;
+                await mqttServer.StartAsync();
+
+                Console.WriteLine("Press Enter to exit.");
+                Console.ReadLine();
+
+                await mqttServer.StopAsync();
+            }
+            Console.WriteLine("Hello, World!");
+        }
+
+        private static Task MqttServer_ClientDisconnectedAsync(ClientDisconnectedEventArgs arg)
+        {
+            throw new NotImplementedException();
+        }
+
+        private static Task MqttServer_ClientConnectedAsync(ClientConnectedEventArgs arg)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}