Added package properties.

Source/MQTTnet/Packets/MqttConnectPacket.cs

@@ -1,6 +1,34 @@
-namespace MQTTnet.Packets
+using System.Collections.Generic;
+using MQTTnet.Packets.Properties;
+
+namespace MQTTnet.Packets
 {
-    public abstract class MqttConnectPacket : MqttBasePacket
+    public class MqttConnectPacket : MqttBasePacket
     {
+        public string ProtocolName { get; set; }
+
+        public byte ProtocolLevel { get; set; }
+
+        public string ClientId { get; set; }
+
+        public string Username { get; set; }
+
+        public string Password { get; set; }
+
+        public ushort KeepAlivePeriod { get; set; }
+
+        /// <summary>
+        /// MQTTv5: Also called "Clean Start".
+        /// </summary>
+        public bool CleanSession { get; set; }
+
+        public MqttApplicationMessage WillMessage { get; set; }
+
+        public List<Property> Properties { get; set; }
+
+        public override string ToString()
+        {
+            return "Connect: [ProtocolLevel=" + ProtocolLevel + "] [ClientId=" + ClientId + "] [Username=" + Username + "] [Password=" + Password + "] [KeepAlivePeriod=" + KeepAlivePeriod + "] [CleanSession=" + CleanSession + "]";
+        }
     }
 }

Source/MQTTnet/Packets/Properties/ByteValue.cs

@@ -0,0 +1,22 @@
+using System;
+using MQTTnet.Serializer;
+
+namespace MQTTnet.Packets.Properties
+{
+    public class ByteValue : IPropertyValue
+    {
+        public ByteValue(byte value)
+        {
+            Value = value;
+        }
+
+        public byte Value { get; }
+
+        public void WriteTo(MqttPacketWriter writer)
+        {
+            if (writer == null) throw new ArgumentNullException(nameof(writer));
+            
+            writer.Write(Value);
+        }
+    }
+}

Source/MQTTnet/Packets/Properties/IPropertyValue.cs

@@ -0,0 +1,9 @@
+using MQTTnet.Serializer;
+
+namespace MQTTnet.Packets.Properties
+{
+    public interface IPropertyValue
+    {
+        void WriteTo(MqttPacketWriter writer);
+    }
+}

Source/MQTTnet/Packets/Properties/Property.cs

@@ -0,0 +1,9 @@
+namespace MQTTnet.Packets.Properties
+{
+    public class Property
+    {
+        public PropertyType Type { get; set; }
+
+        public IPropertyValue Value { get; set; }
+    }
+}

Source/MQTTnet/Packets/Properties/PropertyType.cs

@@ -0,0 +1,33 @@
+namespace MQTTnet.Packets.Properties
+{
+    public enum PropertyType
+    {
+        PayloadFormatIndicator = 1,
+        MessageExpiryInterval = 2,
+        ContentType = 3,
+        ResponseTopic = 8,
+        CorrelationData = 9,
+        SubscriptionIdentifier = 11,
+        SessionExpiryInterval = 17,
+        AssignedClientIdentifer = 18,
+        ServerKeepAlive = 19,
+        AuthenticationMethod = 21,
+        AuthenticationData = 22,
+        RequestProblemInformation = 23,
+        WillDelayInterval = 24,
+        RequestResponseInformation = 25,
+        ResponseInformation = 26,
+        ServerReference = 28,
+        ReasonString = 31,
+        ReceiveMaximum = 33,
+        TopicAliasMaximum = 34,
+        TopicAlias = 35,
+        MaximumQoS = 36,
+        RetainAvailable = 37,
+        UserProperty = 38,
+        MaximumPacketSize = 39,
+        WildcardSubscriptionAvailable = 40,
+        SubscriptionIdentifierAvailable = 41,
+        SharedSubscriptionAvailable = 42
+    }
+}

Source/MQTTnet/Packets/Properties/StringValue.cs

@@ -0,0 +1,22 @@
+using System;
+using MQTTnet.Serializer;
+
+namespace MQTTnet.Packets.Properties
+{
+    public class StringValue : IPropertyValue
+    {
+        public StringValue(string value)
+        {
+            Value = value;
+        }
+
+        public string Value { get; }
+
+        public void WriteTo(MqttPacketWriter writer)
+        {
+            if (writer == null) throw new ArgumentNullException(nameof(writer));
+
+            writer.WriteWithLengthPrefix(Value);
+        }
+    }
+}

Source/MQTTnet/Packets/Properties/TwoByteIntegerValue.cs

@@ -0,0 +1,22 @@
+using System;
+using MQTTnet.Serializer;
+
+namespace MQTTnet.Packets.Properties
+{
+    public class TwoByteIntegerValue : IPropertyValue
+    {
+        public TwoByteIntegerValue(ushort value)
+        {
+            Value = value;
+        }
+
+        public ushort Value { get; }
+
+        public void WriteTo(MqttPacketWriter writer)
+        {
+            if (writer == null) throw new ArgumentNullException(nameof(writer));
+
+            throw new NotImplementedException();
+        }
+    }
+}

Source/MQTTnet/Packets/V3/MqttV3ConnectPacket.cs

@@ -1,26 +0,0 @@
-namespace MQTTnet.Packets.V3
-{
-    public class MqttV3ConnectPacket : MqttConnectPacket
-    {
-        public string ProtocolName { get; set; }
-
-        public byte ProtocolLevel { get; set; }
-
-        public string ClientId { get; set; }
-
-        public string Username { get; set; }
-
-        public string Password { get; set; }
-
-        public ushort KeepAlivePeriod { get; set; }
-
-        public bool CleanSession { get; set; }
-
-        public MqttApplicationMessage WillMessage { get; set; }
-
-        public override string ToString()
-        {
-            return "Connect: [ProtocolLevel=" + ProtocolLevel + "] [ClientId=" + ClientId + "] [Username=" + Username + "] [Password=" + Password + "] [KeepAlivePeriod=" + KeepAlivePeriod + "] [CleanSession=" + CleanSession + "]";
-        }
-    }
-}