Added package properties.

Source/MQTTnet/Client/MqttClient.cs

@@ -196,7 +196,7 @@ namespace MQTTnet.Client
 
         private async Task<MqttV3ConnAckPacket> AuthenticateAsync(MqttApplicationMessage willApplicationMessage, CancellationToken cancellationToken)
         {
-            var connectPacket = new MqttV3ConnectPacket
+            var connectPacket = new MqttConnectPacket
             {
                 ClientId = _options.ClientId,
                 Username = _options.Credentials?.Username,

Source/MQTTnet/MQTTnet.csproj

@@ -64,7 +64,9 @@
   </ItemGroup>
 
   <ItemGroup>
-    <Folder Include="Packets\V5\" />
+    <Compile Remove="NewFolder\**" />
+    <EmbeddedResource Remove="NewFolder\**" />
+    <None Remove="NewFolder\**" />
   </ItemGroup>
 
 </Project>

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 + "]";
-        }
-    }
-}

Source/MQTTnet/Serializer/MqttPacketSerializerAdapter.cs

@@ -34,7 +34,7 @@ namespace MQTTnet.Serializer
         {
             if (Serializer == null)
             {
-                throw new InvalidOperationException("Protocol version nor set or detected.");
+                throw new InvalidOperationException("Protocol version not set or detected.");
             }
 
             return Serializer.Deserialize(receivedMqttPacket);
@@ -48,6 +48,10 @@ namespace MQTTnet.Serializer
         public void DetectProtocolVersion(ReceivedMqttPacket receivedMqttPacket)
         {
             var protocolVersion = ParseProtocolVersion(receivedMqttPacket);
+
+            // Reset the position of the stream beacuse the protocol version is part of 
+            // the regular CONNECT packet. So it will not properly deserialized if this
+            // data is missing.
             receivedMqttPacket.Body.Seek(0);
 
             UseProtocolVersion(protocolVersion);

Source/MQTTnet/Serializer/MqttPacketWriter.cs

@@ -27,9 +27,9 @@ namespace MQTTnet.Serializer
             return (byte)fixedHeader;
         }
 
-        public static ArraySegment<byte> EncodeRemainingLength(int length)
+        public static ArraySegment<byte> EncodeVariableByteInteger(int value)
         {
-            if (length <= 0)
+            if (value <= 0)
             {
                 return new ArraySegment<byte>(new byte[1], 0, 1);
             }
@@ -37,7 +37,7 @@ namespace MQTTnet.Serializer
             var buffer = new byte[4];
             var bufferOffset = 0;
 
-            var x = length;
+            var x = value;
             do
             {
                 var encodedByte = x % 128;
@@ -54,6 +54,11 @@ namespace MQTTnet.Serializer
             return new ArraySegment<byte>(buffer, 0, bufferOffset);
         }
 
+        public void WriteVariableLengthInteger(int value)
+        {
+            Write(EncodeVariableByteInteger(value));
+        }
+
         public void WriteWithLengthPrefix(string value)
         {
             WriteWithLengthPrefix(Encoding.UTF8.GetBytes(value ?? string.Empty));
@@ -85,16 +90,30 @@ namespace MQTTnet.Serializer
             IncreasePostition(1);
         }
 
-        public void Write(byte[] array, int offset, int count)
+        public void Write(byte[] buffer, int offset, int count)
         {
-            if (array == null) throw new ArgumentNullException(nameof(array));
+            if (buffer == null) throw new ArgumentNullException(nameof(buffer));
 
             EnsureAdditionalCapacity(count);
 
-            Array.Copy(array, offset, _buffer, _position, count);
+            Array.Copy(buffer, offset, _buffer, _position, count);
             IncreasePostition(count);
         }
 
+        public void Write(ArraySegment<byte> buffer)
+        {
+            if (buffer == null) throw new ArgumentNullException(nameof(buffer));
+
+            Write(buffer.Array, buffer.Offset, buffer.Count);
+        }
+
+        public void Write(MqttPacketWriter propertyWriter)
+        {
+            if (propertyWriter == null) throw new ArgumentNullException(nameof(propertyWriter));
+            
+            Write(propertyWriter._buffer, 0, propertyWriter.Length);
+        }
+
         public void Reset()
         {
             Length = 5;

Source/MQTTnet/Serializer/MqttV310PacketSerializer.cs

@@ -25,7 +25,7 @@ namespace MQTTnet.Serializer
             var fixedHeader = SerializePacket(packet, _packetWriter);
             var remainingLength = _packetWriter.Length - 5;
 
-            var remainingLengthBuffer = MqttPacketWriter.EncodeRemainingLength(remainingLength);
+            var remainingLengthBuffer = MqttPacketWriter.EncodeVariableByteInteger(remainingLength);
 
             var headerSize = FixedHeaderSize + remainingLengthBuffer.Count;
             var headerOffset = 5 - headerSize;
@@ -79,7 +79,7 @@ namespace MQTTnet.Serializer
         {
             switch (packet)
             {
-                case MqttV3ConnectPacket connectPacket: return SerializeConnectPacket(connectPacket, packetWriter);
+                case MqttConnectPacket connectPacket: return SerializeConnectPacket(connectPacket, packetWriter);
                 case MqttV3ConnAckPacket connAckPacket: return SerializeConnAckPacket(connAckPacket, packetWriter);
                 case MqttDisconnectPacket _: return SerializeEmptyPacket(MqttControlPacketType.Disconnect);
                 case MqttPingReqPacket _: return SerializeEmptyPacket(MqttControlPacketType.PingReq);
@@ -216,7 +216,7 @@ namespace MQTTnet.Serializer
         {
             ThrowIfBodyIsEmpty(body);
 
-            var packet = new MqttV3ConnectPacket
+            var packet = new MqttConnectPacket
             {
                 ProtocolName = body.ReadStringWithLengthPrefix(),
                 ProtocolLevel = body.ReadByte()
@@ -293,7 +293,7 @@ namespace MQTTnet.Serializer
             return packet;
         }
 
-        protected void ValidateConnectPacket(MqttV3ConnectPacket packet)
+        protected void ValidateConnectPacket(MqttConnectPacket packet)
         {
             if (packet == null) throw new ArgumentNullException(nameof(packet));
 
@@ -301,6 +301,11 @@ namespace MQTTnet.Serializer
             {
                 throw new MqttProtocolViolationException("CleanSession must be set if ClientId is empty [MQTT-3.1.3-7].");
             }
+
+            if (packet.Properties != null)
+            {
+                throw new MqttProtocolViolationException("Properties are only supported in MQTT Version 5.");
+            }
         }
 
         // ReSharper disable once ParameterOnlyUsedForPreconditionCheck.Local
@@ -312,7 +317,7 @@ namespace MQTTnet.Serializer
             }
         }
 
-        protected virtual byte SerializeConnectPacket(MqttV3ConnectPacket packet, MqttPacketWriter packetWriter)
+        protected virtual byte SerializeConnectPacket(MqttConnectPacket packet, MqttPacketWriter packetWriter)
         {
             ValidateConnectPacket(packet);
 

Source/MQTTnet/Serializer/MqttV311PacketSerializer.cs

@@ -7,7 +7,7 @@ namespace MQTTnet.Serializer
 {
     public class MqttV311PacketSerializer : MqttV310PacketSerializer
     {
-        protected override byte SerializeConnectPacket(MqttV3ConnectPacket packet, MqttPacketWriter packetWriter)
+        protected override byte SerializeConnectPacket(MqttConnectPacket packet, MqttPacketWriter packetWriter)
         {
             ValidateConnectPacket(packet);
 

Source/MQTTnet/Serializer/MqttV500PacketSerializer.cs

@@ -1,24 +1,96 @@
 using System;
 using MQTTnet.Adapter;
+using MQTTnet.Exceptions;
 using MQTTnet.Packets;
+using MQTTnet.Protocol;
 
 namespace MQTTnet.Serializer
 {
-    public class MqttV500PacketSerializer : IMqttPacketSerializer
+    public class MqttV500PacketSerializer : MqttV311PacketSerializer
     {
-        public ArraySegment<byte> Serialize(MqttBasePacket mqttPacket)
-        {
-            throw new NotImplementedException();
-        }
+        //public ArraySegment<byte> Serialize(MqttBasePacket mqttPacket)
+        //{
+        //    throw new NotImplementedException();
+        //}
 
-        public MqttBasePacket Deserialize(ReceivedMqttPacket receivedMqttPacket)
-        {
-            throw new NotImplementedException();
-        }
+        //public MqttBasePacket Deserialize(ReceivedMqttPacket receivedMqttPacket)
+        //{
+        //    throw new NotImplementedException();
+        //}
 
-        public void FreeBuffer()
+        protected override byte SerializeConnectPacket(MqttConnectPacket packet, MqttPacketWriter packetWriter)
         {
-            throw new NotImplementedException();
+            ValidateConnectPacket(packet);
+
+            packetWriter.WriteWithLengthPrefix("MQTT");
+            packetWriter.Write(5); // [3.1.2.2 Protocol Version]
+
+            byte connectFlags = 0x0;
+            if (packet.CleanSession)
+            {
+                connectFlags |= 0x2;
+            }
+
+            if (packet.WillMessage != null)
+            {
+                connectFlags |= 0x4;
+                connectFlags |= (byte)((byte)packet.WillMessage.QualityOfServiceLevel << 3);
+
+                if (packet.WillMessage.Retain)
+                {
+                    connectFlags |= 0x20;
+                }
+            }
+
+            if (packet.Password != null && packet.Username == null)
+            {
+                throw new MqttProtocolViolationException("If the User Name Flag is set to 0, the Password Flag MUST be set to 0 [MQTT-3.1.2-22].");
+            }
+
+            if (packet.Password != null)
+            {
+                connectFlags |= 0x40;
+            }
+
+            if (packet.Username != null)
+            {
+                connectFlags |= 0x80;
+            }
+
+            packetWriter.Write(connectFlags);
+            packetWriter.Write(packet.KeepAlivePeriod);
+            packetWriter.WriteWithLengthPrefix(packet.ClientId);
+
+            if (packet.WillMessage != null)
+            {
+                packetWriter.WriteWithLengthPrefix(packet.WillMessage.Topic);
+                packetWriter.WriteWithLengthPrefix(packet.WillMessage.Payload);
+            }
+
+            if (packet.Username != null)
+            {
+                packetWriter.WriteWithLengthPrefix(packet.Username);
+            }
+
+            if (packet.Password != null)
+            {
+                packetWriter.WriteWithLengthPrefix(packet.Password);
+            }
+
+            if (packet.Properties != null)
+            {
+                var propertyWriter = new MqttPacketWriter();
+                foreach (var property in packet.Properties)
+                {
+                    propertyWriter.Write((byte)property.Key);
+                    property.Value.WriteTo(propertyWriter);
+                }
+
+                packetWriter.WriteVariableLengthInteger(propertyWriter.Length);
+                packetWriter.Write(propertyWriter);
+            }
+
+            return MqttPacketWriter.BuildFixedHeader(MqttControlPacketType.Connect);
         }
     }
 }

Source/MQTTnet/Server/MqttClientSessionsManager.cs

@@ -218,7 +218,7 @@ namespace MQTTnet.Server
                     return;
                 }
 
-                if (!(firstPacket is MqttV3ConnectPacket connectPacket))
+                if (!(firstPacket is MqttConnectPacket connectPacket))
                 {
                     throw new MqttProtocolViolationException("The first packet from a client must be a 'CONNECT' packet [MQTT-3.1.0-1].");
                 }
@@ -269,7 +269,7 @@ namespace MQTTnet.Server
             }
         }
 
-        private MqttConnectReturnCode ValidateConnection(MqttV3ConnectPacket connectPacket, IMqttChannelAdapter clientAdapter)
+        private MqttConnectReturnCode ValidateConnection(MqttConnectPacket connectPacket, IMqttChannelAdapter clientAdapter)
         {
             if (_options.ConnectionValidator == null)
             {
@@ -287,7 +287,7 @@ namespace MQTTnet.Server
             return context.ReturnCode;
         }
 
-        private PrepareClientSessionResult PrepareClientSession(MqttV3ConnectPacket connectPacket)
+        private PrepareClientSessionResult PrepareClientSession(MqttConnectPacket connectPacket)
         {
             lock (_sessions)
             {

Tests/MQTTnet.Core.Tests/MqttPacketSerializerTests.cs

@@ -19,7 +19,7 @@ namespace MQTTnet.Core.Tests
         [TestMethod]
         public void SerializeV310_MqttConnectPacket()
         {
-            var p = new MqttV3ConnectPacket
+            var p = new MqttConnectPacket
             {
                 ClientId = "XYZ",
                 Password = "PASS",
@@ -34,7 +34,7 @@ namespace MQTTnet.Core.Tests
         [TestMethod]
         public void SerializeV311_MqttConnectPacket()
         {
-            var p = new MqttV3ConnectPacket
+            var p = new MqttConnectPacket
             {
                 ClientId = "XYZ",
                 Password = "PASS",
@@ -49,7 +49,7 @@ namespace MQTTnet.Core.Tests
         [TestMethod]
         public void SerializeV311_MqttConnectPacketWithWillMessage()
         {
-            var p = new MqttV3ConnectPacket
+            var p = new MqttConnectPacket
             {
                 ClientId = "XYZ",
                 Password = "PASS",
@@ -71,7 +71,7 @@ namespace MQTTnet.Core.Tests
         [TestMethod]
         public void DeserializeV311_MqttConnectPacket()
         {
-            var p = new MqttV3ConnectPacket
+            var p = new MqttConnectPacket
             {
                 ClientId = "XYZ",
                 Password = "PASS",
@@ -86,7 +86,7 @@ namespace MQTTnet.Core.Tests
         [TestMethod]
         public void DeserializeV311_MqttConnectPacketWithWillMessage()
         {
-            var p = new MqttV3ConnectPacket
+            var p = new MqttConnectPacket
             {
                 ClientId = "XYZ",
                 Password = "PASS",

Tests/MQTTnet.Core.Tests/RoundtripTimeTests.cs

@@ -36,6 +36,8 @@ namespace MQTTnet.Core.Tests
             var times = new List<TimeSpan>();
             var stopwatch = Stopwatch.StartNew();
 
+            await Task.Delay(1000);
+
             for (var i = 0; i < 100; i++)
             {
                 response = new TaskCompletionSource<string>();