Implement new managed client.

Source/MQTTnet.Extensions.ManagedClient/New/Options/ManagedMqttClientOptions.cs

@@ -0,0 +1,40 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using MQTTnet.Client;
+using MQTTnet.Server;
+
+namespace MQTTnet.Extensions.ManagedClient
+{
+    public sealed class ManagedMqttClientOptions
+    {
+        public ManagedMqttClientOptions()
+        {
+        }
+
+        public ManagedMqttClientOptions(MqttClientOptions clientOptions)
+        {
+            ClientOptions = clientOptions;
+        }
+        
+        public MqttClientOptions ClientOptions { get; set; }
+
+        public TimeSpan AutoReconnectDelay { get; set; } = TimeSpan.FromSeconds(5);
+
+        public TimeSpan ConnectionCheckInterval { get; set; } = TimeSpan.FromSeconds(1);
+
+        public IManagedMqttClientStorage Storage { get; set; }
+
+        public int MaxPendingMessages { get; set; } = int.MaxValue;
+
+        public MqttPendingMessagesOverflowStrategy PendingMessagesOverflowStrategy { get; set; } = MqttPendingMessagesOverflowStrategy.DropNewMessage;
+
+        /// <summary>
+        /// Defines the maximum amount of topic filters which will be sent in a SUBSCRIBE/UNSUBSCRIBE packet.
+        /// Amazon AWS limits this number to 8. The default is int.MaxValue.
+        /// </summary>
+        public int MaxTopicFiltersInSubscribeUnsubscribePackets { get; set; } = int.MaxValue;
+    }
+}