first iteration

Frameworks/MQTTnet.AspnetCore/MqttConnectionHandler.cs

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+using Microsoft.AspNetCore.Connections;
+using MQTTnet.Adapter;
+using MQTTnet.Serializer;
+using MQTTnet.Server;
+using System;
+using System.Threading.Tasks;
+
+namespace MQTTnet.AspNetCore
+{
+    public class MqttConnectionHandler : ConnectionHandler, IMqttServerAdapter
+    {        
+        public event EventHandler<MqttServerAdapterClientAcceptedEventArgs> ClientAccepted;
+
+        public override async Task OnConnectedAsync(ConnectionContext connection)
+        {
+            var serializer = new MqttPacketSerializer();
+            using (var adapter = new MqttConnectionContext(serializer, connection))
+            {
+                var args = new MqttServerAdapterClientAcceptedEventArgs(adapter);
+                ClientAccepted?.Invoke(this, args);
+
+                await args.SessionTask;
+            }
+        }
+
+        public Task StartAsync(IMqttServerOptions options)
+        {
+            return Task.CompletedTask;
+        }
+
+        public Task StopAsync()
+        {
+            return Task.CompletedTask;
+        }
+        
+        public void Dispose()
+        {
+        }
+    }
+}