Remove timeout from send method.

Source/MQTTnet.AspnetCore/MqttConnectionContext.cs

@@ -167,7 +167,7 @@ namespace MQTTnet.AspNetCore
             BytesSent = 0;
         }
 
-        public async Task SendPacketAsync(MqttBasePacket packet, TimeSpan timeout, CancellationToken cancellationToken)
+        public async Task SendPacketAsync(MqttBasePacket packet, CancellationToken cancellationToken)
         {
             var formatter = PacketFormatterAdapter;
             using (await _writerLock.WaitAsync(cancellationToken).ConfigureAwait(false))
@@ -180,6 +180,7 @@ namespace MQTTnet.AspNetCore
                 {
                     BytesSent += msg.Length;
                 }
+
                 PacketFormatterAdapter.FreeBuffer();
             }
         }

Source/MQTTnet/Adapter/IMqttChannelAdapter.cs

@@ -27,7 +27,7 @@ namespace MQTTnet.Adapter
 
         Task DisconnectAsync(TimeSpan timeout, CancellationToken cancellationToken);
 
-        Task SendPacketAsync(MqttBasePacket packet, TimeSpan timeout, CancellationToken cancellationToken);
+        Task SendPacketAsync(MqttBasePacket packet, CancellationToken cancellationToken);
 
         Task<MqttBasePacket> ReceivePacketAsync(CancellationToken cancellationToken);
 

Source/MQTTnet/Adapter/MqttChannelAdapter.cs

@@ -111,7 +111,7 @@ namespace MQTTnet.Adapter
             }
         }
 
-        public async Task SendPacketAsync(MqttBasePacket packet, TimeSpan timeout, CancellationToken cancellationToken)
+        public async Task SendPacketAsync(MqttBasePacket packet, CancellationToken cancellationToken)
         {
             cancellationToken.ThrowIfCancellationRequested();
             ThrowIfDisposed();
@@ -125,15 +125,7 @@ namespace MQTTnet.Adapter
                 {
                     var packetData = PacketFormatterAdapter.Encode(packet);
 
-                    if (timeout == TimeSpan.Zero)
-                    {
-                        await _channel.WriteAsync(packetData.Array, packetData.Offset, packetData.Count, cancellationToken).ConfigureAwait(false);
-                    }
-                    else
-                    {
-                        await MqttTaskTimeout.WaitAsync(
-                            t => _channel.WriteAsync(packetData.Array, packetData.Offset, packetData.Count, t), timeout, cancellationToken).ConfigureAwait(false);
-                    }
+                    await _channel.WriteAsync(packetData.Array, packetData.Offset, packetData.Count, cancellationToken).ConfigureAwait(false);
 
                     Interlocked.Add(ref _bytesReceived, packetData.Count);
 

Source/MQTTnet/Client/MqttClient.cs

@@ -219,11 +219,13 @@ namespace MQTTnet.Client
 
         public Task<MqttClientPublishResult> PublishAsync(MqttApplicationMessage applicationMessage, CancellationToken cancellationToken)
         {
+            cancellationToken.ThrowIfCancellationRequested();
+
             MqttTopicValidator.ThrowIfInvalid(applicationMessage);
 
             ThrowIfDisposed();
             ThrowIfNotConnected();
-
+            
             var publishPacket = _adapter.PacketFormatterAdapter.DataConverter.CreatePublishPacket(applicationMessage);
 
             switch (applicationMessage.QualityOfServiceLevel)
@@ -381,7 +383,7 @@ namespace MQTTnet.Client
 
             _sendTracker.Restart();
 
-            return _adapter.SendPacketAsync(packet, Options.CommunicationTimeout, cancellationToken);
+            return _adapter.SendPacketAsync(packet, cancellationToken);
         }
 
         async Task<TResponsePacket> SendAndReceiveAsync<TResponsePacket>(MqttBasePacket requestPacket, CancellationToken cancellationToken) where TResponsePacket : MqttBasePacket
@@ -399,8 +401,7 @@ namespace MQTTnet.Client
                 try
                 {
                     _sendTracker.Restart();
-
-                    await _adapter.SendPacketAsync(requestPacket, Options.CommunicationTimeout, cancellationToken).ConfigureAwait(false);
+                    await _adapter.SendPacketAsync(requestPacket, cancellationToken).ConfigureAwait(false);
                 }
                 catch (Exception e)
                 {
@@ -439,7 +440,7 @@ namespace MQTTnet.Client
 
                     if (waitTime <= TimeSpan.Zero)
                     {
-                        await SendAndReceiveAsync<MqttPingRespPacket>(new MqttPingReqPacket(), cancellationToken).ConfigureAwait(false);
+                        await SendAndReceiveAsync<MqttPingRespPacket>(MqttPingReqPacket.Instance, cancellationToken).ConfigureAwait(false);
                     }
 
                     // Wait a fixed time in all cases. Calculation of the remaining time is complicated

Source/MQTTnet/Client/MqttPacketIdentifierProvider.cs

@@ -1,9 +1,10 @@
 namespace MQTTnet.Client
 {
-    public class MqttPacketIdentifierProvider
+    public sealed class MqttPacketIdentifierProvider
     {
-        private readonly object _syncRoot = new object();
-        private ushort _value;
+        readonly object _syncRoot = new object();
+
+        ushort _value;
 
         public void Reset()
         {

Source/MQTTnet/Client/Options/MqttClientTcpOptions.cs

@@ -8,7 +8,7 @@ namespace MQTTnet.Client.Options
 
         public int? Port { get; set; }
 
-        public int BufferSize { get; set; } = 65536;
+        public int BufferSize { get; set; } = 8192;
 
         public bool? DualMode { get; set; }
 

Source/MQTTnet/Implementations/CrossPlatformSocket.cs

@@ -51,13 +51,19 @@ namespace MQTTnet.Implementations
             get => _socket.ReceiveBufferSize;
             set => _socket.ReceiveBufferSize = value;
         }
-
+        
         public int SendBufferSize
         {
             get => _socket.SendBufferSize;
             set => _socket.SendBufferSize = value;
         }
 
+        public int SendTimeout
+        {
+            get => _socket.SendTimeout;
+            set => _socket.SendTimeout = value;
+        }
+
         public EndPoint RemoteEndPoint => _socket.RemoteEndPoint;
 
         public bool ReuseAddress

Source/MQTTnet/Implementations/MqttTcpChannel.cs

@@ -17,14 +17,14 @@ namespace MQTTnet.Implementations
     public sealed class MqttTcpChannel : IMqttChannel
     {
         readonly IMqttClientOptions _clientOptions;
-        readonly MqttClientTcpOptions _options;
+        readonly MqttClientTcpOptions _tcpOptions;
 
         Stream _stream;
 
         public MqttTcpChannel(IMqttClientOptions clientOptions)
         {
             _clientOptions = clientOptions ?? throw new ArgumentNullException(nameof(clientOptions));
-            _options = (MqttClientTcpOptions)clientOptions.ChannelOptions;
+            _tcpOptions = (MqttClientTcpOptions)clientOptions.ChannelOptions;
 
             IsSecureConnection = clientOptions.ChannelOptions?.TlsOptions?.UseTls == true;
         }
@@ -50,34 +50,35 @@ namespace MQTTnet.Implementations
             CrossPlatformSocket socket = null;
             try
             {
-                if (_options.AddressFamily == AddressFamily.Unspecified)
+                if (_tcpOptions.AddressFamily == AddressFamily.Unspecified)
                 {
                     socket = new CrossPlatformSocket();
                 }
                 else
                 {
-                    socket = new CrossPlatformSocket(_options.AddressFamily);
+                    socket = new CrossPlatformSocket(_tcpOptions.AddressFamily);
                 }
 
-                socket.ReceiveBufferSize = _options.BufferSize;
-                socket.SendBufferSize = _options.BufferSize;
-                socket.NoDelay = _options.NoDelay;
+                socket.ReceiveBufferSize = _tcpOptions.BufferSize;
+                socket.SendBufferSize = _tcpOptions.BufferSize;
+                socket.SendTimeout = (int)_clientOptions.CommunicationTimeout.TotalMilliseconds;
+                socket.NoDelay = _tcpOptions.NoDelay;
 
-                if (_options.DualMode.HasValue)
+                if (_tcpOptions.DualMode.HasValue)
                 {
                     // It is important to avoid setting the flag if no specific value is set by the user
                     // because on IPv4 only networks the setter will always throw an exception. Regardless
                     // of the actual value.
-                    socket.DualMode = _options.DualMode.Value;
+                    socket.DualMode = _tcpOptions.DualMode.Value;
                 }
 
-                await socket.ConnectAsync(_options.Server, _options.GetPort(), cancellationToken).ConfigureAwait(false);
+                await socket.ConnectAsync(_tcpOptions.Server, _tcpOptions.GetPort(), cancellationToken).ConfigureAwait(false);
 
                 cancellationToken.ThrowIfCancellationRequested();
 
                 var networkStream = socket.GetStream();
                 
-                if (_options.TlsOptions?.UseTls == true)
+                if (_tcpOptions.TlsOptions?.UseTls == true)
                 {
                     var sslStream = new SslStream(networkStream, false, InternalUserCertificateValidationCallback);
                     try
@@ -85,16 +86,16 @@ namespace MQTTnet.Implementations
 #if NETCOREAPP3_1
                         var sslOptions = new SslClientAuthenticationOptions
                         {
-                            ApplicationProtocols = _options.TlsOptions.ApplicationProtocols,
+                            ApplicationProtocols = _tcpOptions.TlsOptions.ApplicationProtocols,
                             ClientCertificates = LoadCertificates(),
-                            EnabledSslProtocols = _options.TlsOptions.SslProtocol,
-                            CertificateRevocationCheckMode = _options.TlsOptions.IgnoreCertificateRevocationErrors ? X509RevocationMode.NoCheck : X509RevocationMode.Online,
-                            TargetHost = _options.Server
+                            EnabledSslProtocols = _tcpOptions.TlsOptions.SslProtocol,
+                            CertificateRevocationCheckMode = _tcpOptions.TlsOptions.IgnoreCertificateRevocationErrors ? X509RevocationMode.NoCheck : X509RevocationMode.Online,
+                            TargetHost = _tcpOptions.Server
                         };
 
                         await sslStream.AuthenticateAsClientAsync(sslOptions, cancellationToken).ConfigureAwait(false);
 #else 
-                        await sslStream.AuthenticateAsClientAsync(_options.Server, LoadCertificates(), _options.TlsOptions.SslProtocol, !_options.TlsOptions.IgnoreCertificateRevocationErrors).ConfigureAwait(false);
+                        await sslStream.AuthenticateAsClientAsync(_tcpOptions.Server, LoadCertificates(), _tcpOptions.TlsOptions.SslProtocol, !_tcpOptions.TlsOptions.IgnoreCertificateRevocationErrors).ConfigureAwait(false);
 #endif
                     }
                     catch
@@ -132,8 +133,6 @@ namespace MQTTnet.Implementations
 
         public async Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
         {
-            if (buffer is null) throw new ArgumentNullException(nameof(buffer));
-
             cancellationToken.ThrowIfCancellationRequested();
 
             try
@@ -174,8 +173,6 @@ namespace MQTTnet.Implementations
 
         public async Task WriteAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
         {
-            if (buffer is null) throw new ArgumentNullException(nameof(buffer));
-
             cancellationToken.ThrowIfCancellationRequested();
 
             try
@@ -232,7 +229,7 @@ namespace MQTTnet.Implementations
             #region OBSOLETE
 
 #pragma warning disable CS0618 // Type or member is obsolete
-            var certificateValidationCallback = _options?.TlsOptions?.CertificateValidationCallback;
+            var certificateValidationCallback = _tcpOptions?.TlsOptions?.CertificateValidationCallback;
 #pragma warning restore CS0618 // Type or member is obsolete
             if (certificateValidationCallback != null)
             {
@@ -240,7 +237,7 @@ namespace MQTTnet.Implementations
             }
             #endregion
 
-            var certificateValidationHandler = _options?.TlsOptions?.CertificateValidationHandler;
+            var certificateValidationHandler = _tcpOptions?.TlsOptions?.CertificateValidationHandler;
             if (certificateValidationHandler != null)
             {
                 var context = new MqttClientCertificateValidationCallbackContext
@@ -248,7 +245,7 @@ namespace MQTTnet.Implementations
                     Certificate = x509Certificate,
                     Chain = chain,
                     SslPolicyErrors = sslPolicyErrors,
-                    ClientOptions = _options
+                    ClientOptions = _tcpOptions
                 };
 
                 return certificateValidationHandler(context);
@@ -261,7 +258,7 @@ namespace MQTTnet.Implementations
 
             if (chain.ChainStatus.Any(c => c.Status == X509ChainStatusFlags.RevocationStatusUnknown || c.Status == X509ChainStatusFlags.Revoked || c.Status == X509ChainStatusFlags.OfflineRevocation))
             {
-                if (_options?.TlsOptions?.IgnoreCertificateRevocationErrors != true)
+                if (_tcpOptions?.TlsOptions?.IgnoreCertificateRevocationErrors != true)
                 {
                     return false;
                 }
@@ -269,24 +266,24 @@ namespace MQTTnet.Implementations
 
             if (chain.ChainStatus.Any(c => c.Status == X509ChainStatusFlags.PartialChain))
             {
-                if (_options?.TlsOptions?.IgnoreCertificateChainErrors != true)
+                if (_tcpOptions?.TlsOptions?.IgnoreCertificateChainErrors != true)
                 {
                     return false;
                 }
             }
 
-            return _options?.TlsOptions?.AllowUntrustedCertificates == true;
+            return _tcpOptions?.TlsOptions?.AllowUntrustedCertificates == true;
         }
 
         X509CertificateCollection LoadCertificates()
         {
             var certificates = new X509CertificateCollection();
-            if (_options.TlsOptions.Certificates == null)
+            if (_tcpOptions.TlsOptions.Certificates == null)
             {
                 return certificates;
             }
 
-            foreach (var certificate in _options.TlsOptions.Certificates)
+            foreach (var certificate in _tcpOptions.TlsOptions.Certificates)
             {
                 certificates.Add(certificate);
             }

Source/MQTTnet/LowLevelClient/LowLevelMqttClient.cs

@@ -76,7 +76,7 @@ namespace MQTTnet.LowLevelClient
 
             try
             {
-                await _adapter.SendPacketAsync(packet, _options.CommunicationTimeout, cancellationToken).ConfigureAwait(false);
+                await _adapter.SendPacketAsync(packet, cancellationToken).ConfigureAwait(false);
             }
             catch (Exception)
             {

Source/MQTTnet/Server/MqttClientConnection.cs

@@ -100,7 +100,7 @@ namespace MQTTnet.Server
                     await _channelAdapter.SendPacketAsync(new MqttDisconnectPacket
                     {
                         ReasonCode = reason
-                    }, _serverOptions.DefaultCommunicationTimeout, CancellationToken.None).ConfigureAwait(false);
+                    }, CancellationToken.None).ConfigureAwait(false);
                 }
                 catch (Exception exception)
                 {
@@ -485,16 +485,17 @@ namespace MQTTnet.Server
             }
         }
 
-        async Task SendAsync(MqttBasePacket packet, CancellationToken cancellationToken)
+        Task SendAsync(MqttBasePacket packet, CancellationToken cancellationToken)
         {
-            await _channelAdapter.SendPacketAsync(packet, _serverOptions.DefaultCommunicationTimeout, cancellationToken).ConfigureAwait(false);
-
-            Interlocked.Increment(ref _receivedPacketsCount);
-
-            if (packet is MqttPublishPacket)
+            return _channelAdapter.SendPacketAsync(packet, cancellationToken).ContinueWith(task =>
             {
-                Interlocked.Increment(ref _receivedApplicationMessagesCount);
-            }
+                Interlocked.Increment(ref _receivedPacketsCount);
+
+                if (packet is MqttPublishPacket)
+                {
+                    Interlocked.Increment(ref _receivedApplicationMessagesCount);
+                }
+            }, cancellationToken);
         }
     }
 }

Source/MQTTnet/Server/MqttClientSessionsManager.cs

@@ -18,7 +18,7 @@ namespace MQTTnet.Server
 {
     public sealed class MqttClientSessionsManager : IDisposable
     {
-        readonly BlockingCollection<MqttEnqueuedApplicationMessage> _messageQueue = new BlockingCollection<MqttEnqueuedApplicationMessage>();
+        readonly BlockingCollection<MqttPendingApplicationMessage> _messageQueue = new BlockingCollection<MqttPendingApplicationMessage>();
 
         readonly object _createConnectionSyncRoot = new object();
         readonly Dictionary<string, MqttClientConnection> _connections = new Dictionary<string, MqttClientConnection>();
@@ -92,7 +92,7 @@ namespace MQTTnet.Server
                     // Send failure response here without preparing a session. The result for a successful connect
                     // will be sent from the session itself.
                     var connAckPacket = channelAdapter.PacketFormatterAdapter.DataConverter.CreateConnAckPacket(connectionValidatorContext);
-                    await channelAdapter.SendPacketAsync(connAckPacket, _options.DefaultCommunicationTimeout, cancellationToken).ConfigureAwait(false);
+                    await channelAdapter.SendPacketAsync(connAckPacket, cancellationToken).ConfigureAwait(false);
 
                     return;
                 }
@@ -177,7 +177,7 @@ namespace MQTTnet.Server
         {
             if (applicationMessage == null) throw new ArgumentNullException(nameof(applicationMessage));
 
-            _messageQueue.Add(new MqttEnqueuedApplicationMessage(applicationMessage, sender));
+            _messageQueue.Add(new MqttPendingApplicationMessage(applicationMessage, sender));
         }
 
         public Task SubscribeAsync(string clientId, ICollection<MqttTopicFilter> topicFilters)
@@ -273,7 +273,7 @@ namespace MQTTnet.Server
             {
                 cancellationToken.ThrowIfCancellationRequested();
 
-                MqttEnqueuedApplicationMessage queuedApplicationMessage;
+                MqttPendingApplicationMessage queuedApplicationMessage;
                 try
                 {
                      queuedApplicationMessage = _messageQueue.Take(cancellationToken);

Source/MQTTnet/Server/MqttEnqueuedApplicationMessage.cs → Source/MQTTnet/Server/MqttPendingApplicationMessage.cs

@@ -1,8 +1,8 @@
 namespace MQTTnet.Server
 {
-    public class MqttEnqueuedApplicationMessage
+    public sealed class MqttPendingApplicationMessage
     {
-        public MqttEnqueuedApplicationMessage(MqttApplicationMessage applicationMessage, MqttClientConnection sender)
+        public MqttPendingApplicationMessage(MqttApplicationMessage applicationMessage, MqttClientConnection sender)
         {
             Sender = sender;
             ApplicationMessage = applicationMessage;

Tests/MQTTnet.AspNetCore.Tests/MqttConnectionContextTest.cs

@@ -85,7 +85,7 @@ namespace MQTTnet.AspNetCore.Tests
             connection.Transport = pipe;
             var ctx = new MqttConnectionContext(serializer, connection);
 
-            await ctx.SendPacketAsync(new MqttPublishPacket() { Payload = new byte[20_000] }, TimeSpan.Zero, CancellationToken.None).ConfigureAwait(false);
+            await ctx.SendPacketAsync(new MqttPublishPacket { Payload = new byte[20_000] }, CancellationToken.None).ConfigureAwait(false);
 
             var readResult = await pipe.Send.Reader.ReadAsync();
             Assert.IsTrue(readResult.Buffer.Length > 20000);

Tests/MQTTnet.Benchmarks/ChannelAdapterBenchmark.cs

@@ -66,7 +66,7 @@ namespace MQTTnet.Benchmarks
 
             for (var i = 0; i < 10000; i++)
             {
-                _channelAdapter.SendPacketAsync(_packet, TimeSpan.Zero, CancellationToken.None).GetAwaiter().GetResult();
+                _channelAdapter.SendPacketAsync(_packet, CancellationToken.None).GetAwaiter().GetResult();
             }
 
             _stream.Position = 0;

Tests/MQTTnet.Core.Tests/Mockups/TestMqttCommunicationAdapter.cs

@@ -42,7 +42,7 @@ namespace MQTTnet.Tests.Mockups
             return Task.FromResult(0);
         }
 
-        public Task SendPacketAsync(MqttBasePacket packet, TimeSpan timeout, CancellationToken cancellationToken)
+        public Task SendPacketAsync(MqttBasePacket packet, CancellationToken cancellationToken)
         {
             ThrowIfPartnerIsNull();
 

Tests/MQTTnet.Core.Tests/Protocol_Tests.cs

@@ -11,9 +11,11 @@ namespace MQTTnet.Tests
         {
             for (uint i = 0; i < 268435455; i++)
             {
-                var buffer = MqttPacketWriter.EncodeVariableLengthInteger(i);
-                var reader = new MqttPacketBodyReader(buffer.Array, buffer.Offset, buffer.Count);
+                var writer = new MqttPacketWriter();
+                writer.WriteVariableLengthInteger(i);
+                var buffer = writer.GetBuffer();
 
+                var reader = new MqttPacketBodyReader(buffer, 0, writer.Length);
                 var checkValue = reader.ReadVariableLengthInteger();
 
                 Assert.AreEqual(i, checkValue);

Tests/MQTTnet.TestApp.NetCore/Program.cs

@@ -31,7 +31,6 @@ namespace MQTTnet.TestApp.NetCore
             Console.WriteLine("a = Start QoS 2 benchmark");
             Console.WriteLine("b = Start QoS 1 benchmark");
             Console.WriteLine("c = Start QoS 0 benchmark");
-            Console.WriteLine("c = Start QoS 0 benchmark");
 
             var pressedKey = Console.ReadKey(true);
             if (pressedKey.KeyChar == '1')