Merge branch 'develop'

Build/MQTTnet.nuspec

@@ -11,16 +11,14 @@
     <requireLicenseAcceptance>false</requireLicenseAcceptance>
     <description>MQTTnet is a high performance .NET library for MQTT based communication. It provides a MQTT client and a MQTT server (broker) and supports v3.1.0, v3.1.1 and v5.0.0 of the MQTT protocol.</description>
     <releaseNotes>
-* [Core] Nuget packages with symbols are now also published to improve debugging.
-* [Core] Improve task handling (thanks to @mwinterb)
-* [ManagedClient] Fix a race condition in the message storage (thanks to @PaulFake).
-* [Server] Added items dictionary to client session in order to share data across interceptors as along as the session exists.
-* [Server] Exposed CONNECT packet properties in Application Message and Subscription interceptor.
-* [Server] Fixed: Sending Large packets with AspnetCore based connection throws System.ArgumentException.
-* [Server] Fixed wrong usage of socket option _NoDelay_.
-* [Server] Added remote certificate validation callback (thanks to @rudacs).
-* [Server] Add support for certificate passwords (thanks to @cslutgen).
-* [MQTTnet.Server] Added REST API for publishing basic messages.
+* [Core] Converted all pending methods to use async/await.
+* [Core] Fixed an issue when serializing a PubRec (QoS 2) packet for MQTTv5.
+* [Client] Fixed an issue when checking for revoked SSL certificates (thanks to @cslutgen).
+* [RpcClient] Added support for custom topic generation strategies.
+* [Server] Refactoring of server certificate password classes (BREAKING CHANGE!).
+* [Server] Fixed an issue with empty server certificate passwords (thanks to @SeppPenner).
+* [MQTTnet.Server] Added support for certificate passwords (BREAKING CHANGE IN CONFIG!)
+* [MQTTnet.AspNetCore] Fixed an issue with MQTTv5 package serialization (#743, thanks to @JanEggers, @pcbing).
     </releaseNotes>
     <copyright>Copyright Christian Kratky 2016-2019</copyright>
     <tags>MQTT Message Queue Telemetry Transport MQTTClient MQTTServer Server MQTTBroker Broker NETStandard IoT InternetOfThings Messaging Hardware Arduino Sensor Actuator M2M ESP Smart Home Cities Automation Xamarin</tags> 

Build/build.ps1

@@ -43,8 +43,14 @@ Write-Host
 &$msbuild ..\Source\MQTTnet.Extensions.WebSocket4Net\MQTTnet.Extensions.WebSocket4Net.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="netstandard2.0" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
 &$msbuild ..\Source\MQTTnet.Extensions.WebSocket4Net\MQTTnet.Extensions.WebSocket4Net.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="uap10.0" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
 
-# Create NuGet packages.
+# Build and execute tests
+&$msbuild ..\Tests\MQTTnet.Core.Tests\MQTTnet.Tests.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="netcoreapp2.1" /verbosity:m
+&$msbuild ..\Tests\MQTTnet.AspNetCore.Tests\MQTTnet.AspNetCore.Tests.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="netcoreapp2.1" /verbosity:m
+
+vstest.console.exe ..\Tests\MQTTnet.Core.Tests\bin\Release\netcoreapp2.1\MQTTnet.Tests.dll
+vstest.console.exe ..\Tests\MQTTnet.AspNetCore.Tests\bin\Release\netcoreapp2.1\MQTTnet.AspNetCore.Tests.dll
 
+# Create NuGet packages.
 Invoke-WebRequest -Uri "https://dist.nuget.org/win-x86-commandline/latest/nuget.exe" -OutFile "nuget.exe"
 
 Remove-Item .\NuGet -Force -Recurse -ErrorAction SilentlyContinue

Source/MQTTnet.AspnetCore/SpanBasedMqttPacketWriter.cs

@@ -64,7 +64,6 @@ namespace MQTTnet.AspNetCore
 
             GrowIfNeeded(propertyWriter.Length);
             Write(propertyWriter.GetBuffer(), 0, propertyWriter.Length);
-            Commit(propertyWriter.Length);
         }
 
         public void Write(byte[] payload, int start, int length)

Source/MQTTnet.Extensions.ManagedClient/ManagedMqttClient.cs

@@ -252,6 +252,7 @@ namespace MQTTnet.Extensions.ManagedClient
                 _maintainConnectionTask = null;
             }
 
+            _messageQueueLock.Dispose();
             _mqttClient.Dispose();
         }
 

Source/MQTTnet.Extensions.Rpc/MqttRpcClient.cs

@@ -5,6 +5,8 @@ using System.Threading;
 using System.Threading.Tasks;
 using MQTTnet.Client;
 using MQTTnet.Exceptions;
+using MQTTnet.Extensions.Rpc.Options;
+using MQTTnet.Extensions.Rpc.Options.TopicGeneration;
 using MQTTnet.Protocol;
 
 namespace MQTTnet.Extensions.Rpc
@@ -13,11 +15,18 @@ namespace MQTTnet.Extensions.Rpc
     {
         private readonly ConcurrentDictionary<string, TaskCompletionSource<byte[]>> _waitingCalls = new ConcurrentDictionary<string, TaskCompletionSource<byte[]>>();
         private readonly IMqttClient _mqttClient;
+        private readonly IMqttRpcClientOptions _options;
         private readonly RpcAwareApplicationMessageReceivedHandler _applicationMessageReceivedHandler;
 
-        public MqttRpcClient(IMqttClient mqttClient)
+        [Obsolete("Use MqttRpcClient(IMqttClient mqttClient, IMqttRpcClientOptions options).")]
+        public MqttRpcClient(IMqttClient mqttClient) : this(mqttClient, new MqttRpcClientOptions())
+        {
+        }
+
+        public MqttRpcClient(IMqttClient mqttClient, IMqttRpcClientOptions options)
         {
             _mqttClient = mqttClient ?? throw new ArgumentNullException(nameof(mqttClient));
+            _options = options ?? throw new ArgumentNullException(nameof(options));
 
             _applicationMessageReceivedHandler = new RpcAwareApplicationMessageReceivedHandler(
                 mqttClient.ApplicationMessageReceivedHandler,
@@ -55,8 +64,26 @@ namespace MQTTnet.Extensions.Rpc
                 throw new InvalidOperationException("The application message received handler was modified.");
             }
 
-            var requestTopic = $"MQTTnet.RPC/{Guid.NewGuid():N}/{methodName}";
-            var responseTopic = requestTopic + "/response";
+            var topicNames = _options.TopicGenerationStrategy.CreateRpcTopics(new TopicGenerationContext
+            {
+                MethodName = methodName,
+                QualityOfServiceLevel = qualityOfServiceLevel,
+                MqttClient = _mqttClient,
+                Options = _options
+            });
+
+            var requestTopic = topicNames.RequestTopic;
+            var responseTopic = topicNames.ResponseTopic;
+
+            if (string.IsNullOrWhiteSpace(requestTopic))
+            {
+                throw new MqttProtocolViolationException("RPC request topic is empty.");
+            }
+
+            if (string.IsNullOrWhiteSpace(responseTopic))
+            {
+                throw new MqttProtocolViolationException("RPC response topic is empty.");
+            }
 
             var requestMessage = new MqttApplicationMessageBuilder()
                 .WithTopic(requestTopic)

Source/MQTTnet.Extensions.Rpc/Options/IMqttRpcClientOptions.cs

@@ -0,0 +1,9 @@
+using MQTTnet.Extensions.Rpc.Options.TopicGeneration;
+
+namespace MQTTnet.Extensions.Rpc.Options
+{
+    public interface IMqttRpcClientOptions
+    {
+        IMqttRpcClientTopicGenerationStrategy TopicGenerationStrategy { get; set; }
+    }
+}

Source/MQTTnet.Extensions.Rpc/Options/MqttRpcClientOptions.cs

@@ -0,0 +1,9 @@
+using MQTTnet.Extensions.Rpc.Options.TopicGeneration;
+
+namespace MQTTnet.Extensions.Rpc.Options
+{
+    public class MqttRpcClientOptions : IMqttRpcClientOptions
+    {
+        public IMqttRpcClientTopicGenerationStrategy TopicGenerationStrategy { get; set; } = new DefaultMqttRpcClientTopicGenerationStrategy();
+    }
+}

Source/MQTTnet.Extensions.Rpc/Options/MqttRpcClientOptionsBuilder.cs

@@ -0,0 +1,25 @@
+using MQTTnet.Extensions.Rpc.Options.TopicGeneration;
+using System;
+
+namespace MQTTnet.Extensions.Rpc.Options
+{
+    public class MqttRpcClientOptionsBuilder
+    {
+        IMqttRpcClientTopicGenerationStrategy _topicGenerationStrategy = new DefaultMqttRpcClientTopicGenerationStrategy();
+
+        public MqttRpcClientOptionsBuilder WithTopicGenerationStrategy(IMqttRpcClientTopicGenerationStrategy value)
+        {
+            _topicGenerationStrategy = value ?? throw new ArgumentNullException(nameof(value));
+
+            return this;
+        }
+
+        public IMqttRpcClientOptions Build()
+        {
+            return new MqttRpcClientOptions
+            {
+                TopicGenerationStrategy = _topicGenerationStrategy
+            };
+        }
+    }
+}

Source/MQTTnet.Extensions.Rpc/Options/MqttRpcTopicPair.cs

@@ -0,0 +1,9 @@
+namespace MQTTnet.Extensions.Rpc.Options
+{
+    public class MqttRpcTopicPair
+    {
+        public string RequestTopic { get; set; }
+
+        public string ResponseTopic { get; set; }
+    }
+}

Source/MQTTnet.Extensions.Rpc/Options/TopicGeneration/DefaultMqttRpcClientTopicGenerationStrategy.cs

@@ -0,0 +1,20 @@
+using MQTTnet.Extensions.Rpc.Options.TopicGeneration;
+using System;
+
+namespace MQTTnet.Extensions.Rpc.Options
+{
+    public class DefaultMqttRpcClientTopicGenerationStrategy : IMqttRpcClientTopicGenerationStrategy
+    {
+        public MqttRpcTopicPair CreateRpcTopics(TopicGenerationContext context)
+        {
+            var requestTopic = $"MQTTnet.RPC/{Guid.NewGuid():N}/{context.MethodName}";
+            var responseTopic = requestTopic + "/response";
+
+            return new MqttRpcTopicPair
+            {
+                RequestTopic = requestTopic,
+                ResponseTopic = responseTopic
+            };
+        }
+    }
+}

Source/MQTTnet.Extensions.Rpc/Options/TopicGeneration/IMqttRpcClientTopicGenerationStrategy.cs

@@ -0,0 +1,7 @@
+namespace MQTTnet.Extensions.Rpc.Options.TopicGeneration
+{
+    public interface IMqttRpcClientTopicGenerationStrategy
+    {
+        MqttRpcTopicPair CreateRpcTopics(TopicGenerationContext context);
+    }
+}

Source/MQTTnet.Extensions.Rpc/Options/TopicGeneration/TopicGenerationContext.cs

@@ -0,0 +1,16 @@
+using MQTTnet.Client;
+using MQTTnet.Protocol;
+
+namespace MQTTnet.Extensions.Rpc.Options.TopicGeneration
+{
+    public class TopicGenerationContext
+    {
+        public string MethodName { get; set; }
+
+        public MqttQualityOfServiceLevel QualityOfServiceLevel { get; set; }
+
+        public IMqttClient MqttClient { get; set; }
+
+        public IMqttRpcClientOptions Options { get; set; }
+    }
+}

Source/MQTTnet.Server/Configuration/CertificateSettingsModel.cs

@@ -0,0 +1,35 @@
+using System.IO;
+
+namespace MQTTnet.Server.Configuration
+{
+    public class CertificateSettingsModel
+    {
+        /// <summary>
+        /// Path to certificate.
+        /// </summary>
+        public string Path { get; set; }
+        
+        /// <summary>
+        /// Password of certificate.
+        /// </summary>
+        public string Password { get; set; }
+
+        /// <summary>
+        /// Read certificate file.
+        /// </summary>
+        public byte[] ReadCertificate()
+        {
+            if (string.IsNullOrEmpty(Path) || string.IsNullOrWhiteSpace(Path))
+            {
+                throw new FileNotFoundException("No path set");
+            }
+
+            if (!File.Exists(Path))
+            {
+                throw new FileNotFoundException($"Could not find Certificate in path: {Path}");
+            }
+
+            return File.ReadAllBytes(Path);
+        }
+    }
+}

Source/MQTTnet.Server/Configuration/TcpEndpointModel.cs

@@ -9,9 +9,9 @@ namespace MQTTnet.Server.Configuration
     public class TcpEndPointModel
     {
         /// <summary>
-        /// Path to Certificate
+        /// Certificate settings.
         /// </summary>
-        public string CertificatePath { get; set; }
+        public CertificateSettingsModel Certificate { get; set; }
 
         /// <summary>
         /// Enabled / Disable
@@ -33,25 +33,6 @@ namespace MQTTnet.Server.Configuration
         /// </summary>
         public int Port { get; set; } = 1883;
 
-        /// <summary>
-        /// Read Certificate file
-        /// </summary>
-        /// <returns></returns>
-        public byte[] ReadCertificate()
-        {
-            if (string.IsNullOrEmpty(CertificatePath) || string.IsNullOrWhiteSpace(CertificatePath))
-            {
-                throw new FileNotFoundException("No path set");
-            }
-
-            if (!File.Exists(CertificatePath))
-            {
-                throw new FileNotFoundException($"Could not find Certificate in path: {CertificatePath}");
-            }
-
-            return File.ReadAllBytes(CertificatePath);
-        }
-
         /// <summary>
         /// Read IPv4
         /// </summary>

Source/MQTTnet.Server/Mqtt/MqttServerService.cs

@@ -47,7 +47,7 @@ namespace MQTTnet.Server.Mqtt
             MqttSubscriptionInterceptor mqttSubscriptionInterceptor,
             MqttApplicationMessageInterceptor mqttApplicationMessageInterceptor,
             MqttServerStorage mqttServerStorage,
-            PythonScriptHostService pythonScriptHostService,            
+            PythonScriptHostService pythonScriptHostService,
             ILogger<MqttServerService> logger)
         {
             _settings = mqttSettings ?? throw new ArgumentNullException(nameof(mqttSettings));
@@ -179,7 +179,7 @@ namespace MQTTnet.Server.Mqtt
                 .WithApplicationMessageInterceptor(_mqttApplicationMessageInterceptor)
                 .WithSubscriptionInterceptor(_mqttSubscriptionInterceptor)
                 .WithStorage(_mqttServerStorage);
-            
+
             // Configure unencrypted connections
             if (_settings.TcpEndPoint.Enabled)
             {
@@ -210,9 +210,23 @@ namespace MQTTnet.Server.Mqtt
             {
                 options
                     .WithEncryptedEndpoint()
-                    .WithEncryptionSslProtocol(SslProtocols.Tls12)
-                    .WithEncryptionCertificate(_settings.EncryptedTcpEndPoint.ReadCertificate());
+                    .WithEncryptionSslProtocol(SslProtocols.Tls12);
+                
+                if (!string.IsNullOrEmpty(_settings.EncryptedTcpEndPoint?.Certificate?.Path))
+                {
+                    IMqttServerCertificateCredentials certificateCredentials = null;
 
+                    if (!string.IsNullOrEmpty(_settings.EncryptedTcpEndPoint?.Certificate?.Password))
+                    {
+                        certificateCredentials = new MqttServerCertificateCredentials
+                        {
+                            Password = _settings.EncryptedTcpEndPoint.Certificate.Password
+                        };
+                    }
+
+                    options.WithEncryptionCertificate(_settings.EncryptedTcpEndPoint.Certificate.ReadCertificate(), certificateCredentials);
+                }
+                
                 if (_settings.EncryptedTcpEndPoint.TryReadIPv4(out var address4))
                 {
                     options.WithEncryptedEndpointBoundIPAddress(address4);

Source/MQTTnet.Server/appsettings.json

@@ -27,7 +27,10 @@
             "IPv4": "*",
             "IPv6": "*",
             "Port": 8883,
-            "CertificatePath": "/absolute/path/to/pfx"
+            "Certificate": {
+                "Path": "/absolute/path/to/pfx",
+                "Password": ""
+            }
         },
         "WebSocketEndPoint": {
             "Enabled": true,
@@ -63,4 +66,4 @@
         }
     },
     "AllowedHosts": "*"
-}
+}

Source/MQTTnet/Formatter/IMqttPacketWriter.cs

@@ -5,15 +5,25 @@
         int Length { get; }
 
         void WriteWithLengthPrefix(string value);
-        void Write(byte returnCode);
-        void WriteWithLengthPrefix(byte[] payload);
-        void Write(ushort keepAlivePeriod);
-        void Write(IMqttPacketWriter propertyWriter);
-        void WriteVariableLengthInteger(uint length);
-        void Write(byte[] payload, int v, int length);
-        void Reset(int v);
-        void Seek(int v);
+
+        void Write(byte value);
+
+        void WriteWithLengthPrefix(byte[] value);
+
+        void Write(ushort value);
+
+        void Write(IMqttPacketWriter value);
+
+        void WriteVariableLengthInteger(uint value);
+
+        void Write(byte[] value, int offset, int length);
+
+        void Reset(int length);
+
+        void Seek(int offset);
+
         void FreeBuffer();
+
         byte[] GetBuffer();
     }
 }

Source/MQTTnet/Formatter/MqttPacketReader.cs

@@ -21,8 +21,6 @@ namespace MQTTnet.Formatter
         {
             // The MQTT fixed header contains 1 byte of flags and at least 1 byte for the remaining data length.
             // So in all cases at least 2 bytes must be read for a complete MQTT packet.
-            // async/await is used here because the next packet is received in a couple of minutes so the performance
-            // impact is acceptable according to a useless waiting thread.
             var buffer = fixedHeaderBuffer;
             var totalBytesRead = 0;
 
@@ -55,16 +53,7 @@ namespace MQTTnet.Formatter
                 };
             }
 
-#if WINDOWS_UWP
-            // UWP will have a dead lock when calling this not async.
             var bodyLength = await ReadBodyLengthAsync(buffer[1], cancellationToken).ConfigureAwait(false);
-#else
-            // Here the async/await pattern is not used because the overhead of context switches
-            // is too big for reading 1 byte in a row. We expect that the remaining data was sent
-            // directly after the initial bytes. If the client disconnects just in this moment we
-            // will get an exception anyway.
-            var bodyLength = ReadBodyLength(buffer[1], cancellationToken);
-#endif
 
             if (!bodyLength.HasValue)
             {
@@ -81,49 +70,6 @@ namespace MQTTnet.Formatter
             };
         }
 
-#if !WINDOWS_UWP
-        private int? ReadBodyLength(byte initialEncodedByte, CancellationToken cancellationToken)
-        {
-            var offset = 0;
-            var multiplier = 128;
-            var value = initialEncodedByte & 127;
-            int encodedByte = initialEncodedByte;
-
-            while ((encodedByte & 128) != 0)
-            {
-                offset++;
-                if (offset > 3)
-                {
-                    throw new MqttProtocolViolationException("Remaining length is invalid.");
-                }
-
-                if (cancellationToken.IsCancellationRequested)
-                {
-                    return null;
-                }
-
-                var readCount = _channel.ReadAsync(_singleByteBuffer, 0, 1, cancellationToken).GetAwaiter().GetResult();
-
-                if (cancellationToken.IsCancellationRequested)
-                {
-                    return null;
-                }
-
-                if (readCount == 0)
-                {
-                    return null;
-                }
-
-                encodedByte = _singleByteBuffer[0];
-
-                value += (encodedByte & 127) * multiplier;
-                multiplier *= 128;
-            }
-
-            return value;
-        }
-#else
-
         private async Task<int?> ReadBodyLengthAsync(byte initialEncodedByte, CancellationToken cancellationToken)
         {
             var offset = 0;
@@ -164,6 +110,5 @@ namespace MQTTnet.Formatter
 
             return value;
         }
-#endif
     }
 }

Source/MQTTnet/Formatter/V5/MqttV500PacketEncoder.cs

@@ -328,10 +328,7 @@ namespace MQTTnet.Formatter.V5
             {
                 ThrowReasonCodeNotSetException();
             }
-
-            packetWriter.Write(packet.PacketIdentifier.Value);
-            packetWriter.Write((byte)packet.ReasonCode.Value);
-
+           
             var propertiesWriter = new MqttV500PropertiesWriter();
             if (packet.Properties != null)
             {
@@ -339,6 +336,8 @@ namespace MQTTnet.Formatter.V5
                 propertiesWriter.WriteUserProperties(packet.Properties.UserProperties);
             }
 
+            packetWriter.Write(packet.PacketIdentifier.Value);
+
             if (packetWriter.Length > 0 || packet.ReasonCode.Value != MqttPubRecReasonCode.Success)
             {
                 packetWriter.Write((byte)packet.ReasonCode.Value);

Source/MQTTnet/Implementations/MqttTcpChannel.cs

@@ -86,7 +86,7 @@ namespace MQTTnet.Implementations
                 var sslStream = new SslStream(networkStream, false, InternalUserCertificateValidationCallback);
                 _stream = sslStream;
 
-                await sslStream.AuthenticateAsClientAsync(_options.Server, LoadCertificates(), _options.TlsOptions.SslProtocol, _options.TlsOptions.IgnoreCertificateRevocationErrors).ConfigureAwait(false);                
+                await sslStream.AuthenticateAsClientAsync(_options.Server, LoadCertificates(), _options.TlsOptions.SslProtocol, !_options.TlsOptions.IgnoreCertificateRevocationErrors).ConfigureAwait(false);                
             }
             else
             {

Source/MQTTnet/Implementations/MqttTcpServerAdapter.cs

@@ -41,14 +41,24 @@ namespace MQTTnet.Implementations
                 RegisterListeners(options.DefaultEndpointOptions, null, _cancellationTokenSource.Token);
             }
 
-            if (options.TlsEndpointOptions.IsEnabled)
+            if (options.TlsEndpointOptions?.IsEnabled == true)
             {
                 if (options.TlsEndpointOptions.Certificate == null)
                 {
                     throw new ArgumentException("TLS certificate is not set.");
                 }
 
-                var tlsCertificate = new X509Certificate2(options.TlsEndpointOptions.Certificate, options.TlsEndpointOptions.CertificateCredentials.Password);
+                X509Certificate2 tlsCertificate;
+                if (string.IsNullOrEmpty(options.TlsEndpointOptions.CertificateCredentials?.Password))
+                {
+                    // Use a different overload when no password is specified. Otherwise the constructor will fail.
+                    tlsCertificate = new X509Certificate2(options.TlsEndpointOptions.Certificate);
+                }
+                else
+                {
+                    tlsCertificate = new X509Certificate2(options.TlsEndpointOptions.Certificate, options.TlsEndpointOptions.CertificateCredentials.Password);
+                }
+                
                 if (!tlsCertificate.HasPrivateKey)
                 {
                     throw new InvalidOperationException("The certificate for TLS encryption must contain the private key.");

Source/MQTTnet/Server/IMqttServerCertificateCredentials.cs

@@ -0,0 +1,4 @@
+public interface IMqttServerCertificateCredentials
+{
+    string Password { get; }
+}

Source/MQTTnet/Server/IMqttServerCredentials.cs

@@ -1,6 +0,0 @@
-using System;
-
-public interface IMqttServerCredentials
-{
-    String Password { get; }
-}

Source/MQTTnet/Server/MqttServerCertificateCredentials.cs

@@ -0,0 +1,7 @@
+namespace MQTTnet.Server
+{
+    public class MqttServerCertificateCredentials : IMqttServerCertificateCredentials
+    {
+        public string Password { get; set; }
+    }
+}

Source/MQTTnet/Server/MqttServerOptionsBuilder.cs

@@ -82,7 +82,7 @@ namespace MQTTnet.Server
             return this;
         }
 
-        public MqttServerOptionsBuilder WithEncryptionCertificate(byte[] value, IMqttServerCredentials credentials = null)
+        public MqttServerOptionsBuilder WithEncryptionCertificate(byte[] value, IMqttServerCertificateCredentials credentials = null)
         {
             _options.TlsEndpointOptions.Certificate = value;
             _options.TlsEndpointOptions.CertificateCredentials = credentials;

Source/MQTTnet/Server/MqttServerTlsTcpEndpointOptions.cs

@@ -12,7 +12,7 @@ namespace MQTTnet.Server
 
         public byte[] Certificate { get; set; }
 
-        public IMqttServerCredentials CertificateCredentials { get; set; }
+        public IMqttServerCertificateCredentials CertificateCredentials { get; set; }
 
         public bool ClientCertificateRequired { get; set; }
 

Tests/MQTTnet.AspNetCore.Tests/MQTTnet.AspNetCore.Tests.csproj

@@ -2,12 +2,11 @@
 
   <PropertyGroup>
     <TargetFramework>netcoreapp2.1</TargetFramework>
-
     <IsPackable>false</IsPackable>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.0.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.2.0" />
     <PackageReference Include="MSTest.TestAdapter" Version="1.4.0" />
     <PackageReference Include="MSTest.TestFramework" Version="1.4.0" />
   </ItemGroup>

Tests/MQTTnet.Core.Tests/MQTTnet.Tests.csproj

@@ -1,15 +1,14 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <OutputType>Exe</OutputType>
-    <DebugType>Full</DebugType>
     <TargetFramework>netcoreapp2.1</TargetFramework>
+    <IsPackable>false</IsPackable>
   </PropertyGroup>
 
   <ItemGroup>
     <PackageReference Include="MSTest.TestAdapter" Version="1.4.0" />
     <PackageReference Include="MSTest.TestFramework" Version="1.4.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.0.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.2.0" />
   </ItemGroup>
 
   <ItemGroup>

Tests/MQTTnet.Core.Tests/MqttKeepAliveMonitor_Tests.cs

@@ -14,7 +14,7 @@ namespace MQTTnet.Tests
     public class MqttKeepAliveMonitor_Tests
     {
         [TestMethod]
-        public void KeepAlive_Timeout()
+        public async Task KeepAlive_Timeout()
         {
             var counter = 0;
 
@@ -31,13 +31,13 @@ namespace MQTTnet.Tests
 
             Assert.AreEqual(0, counter);
 
-            Thread.Sleep(2000); // Internally the keep alive timeout is multiplied with 1.5 as per protocol specification.
+            await Task.Delay(2000); // Internally the keep alive timeout is multiplied with 1.5 as per protocol specification.
 
             Assert.AreEqual(1, counter);
         }
 
         [TestMethod]
-        public void KeepAlive_NoTimeout()
+        public async Task KeepAlive_NoTimeout()
         {
             var counter = 0;
 
@@ -55,15 +55,15 @@ namespace MQTTnet.Tests
             Assert.AreEqual(0, counter);
 
             // Simulate traffic.
-            Thread.Sleep(1000); // Internally the keep alive timeout is multiplied with 1.5 as per protocol specification.
+            await Task.Delay(1000); // Internally the keep alive timeout is multiplied with 1.5 as per protocol specification.
             monitor.PacketReceived();
-            Thread.Sleep(1000);
+            await Task.Delay(1000);
             monitor.PacketReceived();
-            Thread.Sleep(1000);
+            await Task.Delay(1000);
 
             Assert.AreEqual(0, counter);
 
-            Thread.Sleep(2000);
+            await Task.Delay(2000);
 
             Assert.AreEqual(1, counter);
         }

Tests/MQTTnet.Core.Tests/MqttPacketSerializer_Tests.cs

@@ -8,6 +8,7 @@ using Microsoft.VisualStudio.TestTools.UnitTesting;
 using MQTTnet.Adapter;
 using MQTTnet.Formatter;
 using MQTTnet.Formatter.V3;
+using MQTTnet.Formatter.V5;
 using MQTTnet.Internal;
 using MQTTnet.Packets;
 using MQTTnet.Protocol;
@@ -258,6 +259,26 @@ namespace MQTTnet.Tests
             Assert.IsTrue(deserialized.Properties.UserProperties.Any(x => x.Name == "Foo"));
         }
 
+
+        [TestMethod]
+        public void SerializeV500_MqttPublishPacket_CorrelationData()
+        {
+            var data = "123456789";
+            var req = new MqttApplicationMessageBuilder()
+                      .WithTopic("Foo")
+                      .WithResponseTopic($"_")
+                      .WithCorrelationData(Guid.NewGuid().ToByteArray())
+                      .WithPayload(data)
+                      .WithQualityOfServiceLevel(MqttQualityOfServiceLevel.AtMostOnce)
+                      .Build();
+
+            var p = new MqttV500DataConverter().CreatePublishPacket(req);
+
+            var deserialized = Roundtrip(p, MqttProtocolVersion.V500);
+
+            Assert.IsTrue(p.Payload.SequenceEqual(deserialized.Payload));
+        }
+
         [TestMethod]
         public void DeserializeV311_MqttPublishPacket()
         {

Tests/MQTTnet.Core.Tests/RPC_Tests.cs

@@ -10,6 +10,8 @@ using MQTTnet.Extensions.Rpc;
 using MQTTnet.Protocol;
 using MQTTnet.Client.Options;
 using MQTTnet.Formatter;
+using MQTTnet.Extensions.Rpc.Options;
+using MQTTnet.Extensions.Rpc.Options.TopicGeneration;
 
 namespace MQTTnet.Tests
 {
@@ -62,7 +64,22 @@ namespace MQTTnet.Tests
                 
                 var requestSender = await testEnvironment.ConnectClientAsync();
 
-                var rpcClient = new MqttRpcClient(requestSender);
+                var rpcClient = new MqttRpcClient(requestSender, new MqttRpcClientOptionsBuilder().Build());
+                await rpcClient.ExecuteAsync(TimeSpan.FromSeconds(2), "ping", "", MqttQualityOfServiceLevel.AtMostOnce);
+            }
+        }
+
+        [TestMethod]
+        [ExpectedException(typeof(MqttCommunicationTimedOutException))]
+        public async Task Execute_With_Custom_Topic_Names()
+        {
+            using (var testEnvironment = new TestEnvironment())
+            {
+                await testEnvironment.StartServerAsync();
+
+                var requestSender = await testEnvironment.ConnectClientAsync();
+
+                var rpcClient = new MqttRpcClient(requestSender, new MqttRpcClientOptionsBuilder().WithTopicGenerationStrategy(new TestTopicStrategy()) .Build());
                 await rpcClient.ExecuteAsync(TimeSpan.FromSeconds(2), "ping", "", MqttQualityOfServiceLevel.AtMostOnce);
             }
         }
@@ -82,11 +99,23 @@ namespace MQTTnet.Tests
 
                 var requestSender = await testEnvironment.ConnectClientAsync();
 
-                var rpcClient = new MqttRpcClient(requestSender);
+                var rpcClient = new MqttRpcClient(requestSender, new MqttRpcClientOptionsBuilder().Build());
                 var response = await rpcClient.ExecuteAsync(TimeSpan.FromSeconds(5), "ping", "", qosLevel);
 
                 Assert.AreEqual("pong", Encoding.UTF8.GetString(response));
             }
         }
+
+        private class TestTopicStrategy : IMqttRpcClientTopicGenerationStrategy
+        {
+            public MqttRpcTopicPair CreateRpcTopics(TopicGenerationContext context)
+            {
+                return new MqttRpcTopicPair
+                {
+                    RequestTopic = "a",
+                    ResponseTopic = "b"
+                };
+            }
+        }
     }
 }

Tests/MQTTnet.Core.Tests/Server_Tests.cs

@@ -1063,7 +1063,9 @@ namespace MQTTnet.Tests
                 // forever. This is security related.
                 var client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                 await client.ConnectAsync("localhost", testEnvironment.ServerPort);
-                await client.SendAsync(Encoding.UTF8.GetBytes("Garbage"), SocketFlags.None);
+                                
+                var buffer = Encoding.UTF8.GetBytes("Garbage");
+                client.Send(buffer, buffer.Length, SocketFlags.None);
 
                 await Task.Delay(TimeSpan.FromSeconds(3));