Merge from develop.

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

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFramework>netcoreapp2.1</TargetFramework>
@@ -7,9 +7,9 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.7.0" />
-    <PackageReference Include="MSTest.TestAdapter" Version="1.2.1" />
-    <PackageReference Include="MSTest.TestFramework" Version="1.2.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.9.0" />
+    <PackageReference Include="MSTest.TestAdapter" Version="1.3.2" />
+    <PackageReference Include="MSTest.TestFramework" Version="1.3.2" />
   </ItemGroup>
 
   <ItemGroup>

Tests/MQTTnet.AspNetCore.Tests/Mockups/ConnectionContextMockup.cs

@@ -0,0 +1,22 @@
+using System.Collections.Generic;
+using System.IO.Pipelines;
+using Microsoft.AspNetCore.Connections;
+using Microsoft.AspNetCore.Http.Features;
+
+namespace MQTTnet.AspNetCore.Tests.Mockups
+{
+    public class ConnectionContextMockup : ConnectionContext
+    {
+        public override string ConnectionId { get; set; }
+
+        public override IFeatureCollection Features { get; }
+
+        public override IDictionary<object, object> Items { get; set; }
+        public override IDuplexPipe Transport { get; set; }
+
+        public ConnectionContextMockup()
+        {
+            //Transport = new DefaultConnectionContext
+        }
+    }
+}

Tests/MQTTnet.AspNetCore.Tests/Mockups/DuplexPipeMockup.cs

@@ -0,0 +1,16 @@
+using System.IO.Pipelines;
+
+namespace MQTTnet.AspNetCore.Tests.Mockups
+{
+    public class DuplexPipeMockup : IDuplexPipe
+    {
+        PipeReader IDuplexPipe.Input => Receive.Reader;
+
+        PipeWriter IDuplexPipe.Output => Send.Writer;
+
+
+        public Pipe Receive { get; set; } = new Pipe();
+
+        public Pipe Send { get; set; } = new Pipe();
+    }
+}

Tests/MQTTnet.AspNetCore.Tests/MqttConnectionContextTest.cs

@@ -0,0 +1,51 @@
+using Microsoft.AspNetCore.Connections;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using MQTTnet.AspNetCore.Tests.Mockups;
+using MQTTnet.Exceptions;
+using MQTTnet.Packets;
+using MQTTnet.Serializer;
+using System;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace MQTTnet.AspNetCore.Tests
+{
+    [TestClass]
+    public class MqttConnectionContextTest
+    {
+        [TestMethod]
+        public async Task TestReceivePacketAsyncThrowsWhenReaderCompleted()
+        {
+            var serializer = new MqttPacketSerializer {};
+            var pipe = new DuplexPipeMockup();
+            var connection = new DefaultConnectionContext();
+            connection.Transport = pipe;
+            var ctx = new MqttConnectionContext(serializer, connection);
+
+            pipe.Receive.Writer.Complete();
+
+            await Assert.ThrowsExceptionAsync<MqttCommunicationException>(() => ctx.ReceivePacketAsync(TimeSpan.FromSeconds(1), CancellationToken.None));
+        }
+        
+        [TestMethod]
+        public async Task TestParallelWrites()
+        {
+            var serializer = new MqttPacketSerializer { };
+            var pipe = new DuplexPipeMockup();
+            var connection = new DefaultConnectionContext();
+            connection.Transport = pipe;
+            var ctx = new MqttConnectionContext(serializer, connection);
+
+            var tasks = Enumerable.Range(1, 10).Select(_ => Task.Run(async () => 
+            {
+                for (int i = 0; i < 100; i++)
+                {
+                    await ctx.SendPacketAsync(new MqttPublishPacket(), CancellationToken.None).ConfigureAwait(false);
+                }
+            }));
+
+            await Task.WhenAll(tasks).ConfigureAwait(false);
+        }
+    }
+}

Tests/MQTTnet.Benchmarks/LoggerBenchmark.cs

@@ -1,6 +1,4 @@
 using BenchmarkDotNet.Attributes;
-using BenchmarkDotNet.Attributes.Exporters;
-using BenchmarkDotNet.Attributes.Jobs;
 using MQTTnet.Diagnostics;
 
 namespace MQTTnet.Benchmarks

Tests/MQTTnet.Benchmarks/MQTTnet.Benchmarks.csproj

@@ -8,9 +8,9 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="BenchmarkDotNet" Version="0.10.14" />
-    <PackageReference Include="System.IO.Pipelines" Version="4.5.0" />
-    <PackageReference Include="Microsoft.AspNetCore" Version="2.1.0" />
+    <PackageReference Include="BenchmarkDotNet" Version="0.11.1" />
+    <PackageReference Include="System.IO.Pipelines" Version="4.5.2" />
+    <PackageReference Include="Microsoft.AspNetCore" Version="2.1.4" />
   </ItemGroup>
 
   <ItemGroup>

Tests/MQTTnet.Benchmarks/MessageProcessingBenchmark.cs

@@ -1,7 +1,4 @@
 using BenchmarkDotNet.Attributes;
-using BenchmarkDotNet.Attributes.Columns;
-using BenchmarkDotNet.Attributes.Exporters;
-using BenchmarkDotNet.Attributes.Jobs;
 using MQTTnet.Client;
 using MQTTnet.Server;
 

Tests/MQTTnet.Benchmarks/SerializerBenchmark.cs

@@ -2,8 +2,6 @@
 using MQTTnet.Packets;
 using MQTTnet.Serializer;
 using MQTTnet.Internal;
-using BenchmarkDotNet.Attributes.Jobs;
-using BenchmarkDotNet.Attributes.Exporters;
 using System;
 using System.Threading;
 using System.Threading.Tasks;

Tests/MQTTnet.Benchmarks/TopicFilterComparerBenchmark.cs

@@ -1,6 +1,4 @@
 using BenchmarkDotNet.Attributes;
-using BenchmarkDotNet.Attributes.Exporters;
-using BenchmarkDotNet.Attributes.Jobs;
 using MQTTnet.Server;
 using System;
 

Tests/MQTTnet.Core.Tests/BlockingQueueTests.cs

@@ -0,0 +1,108 @@
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using MQTTnet.Internal;
+
+namespace MQTTnet.Core.Tests
+{
+    [TestClass]
+    public class BlockingQueueTests
+    {
+        [TestMethod]
+        public void Preserve_Order()
+        {
+            var queue = new BlockingQueue<string>();
+            queue.Enqueue("a");
+            queue.Enqueue("b");
+            queue.Enqueue("c");
+
+            Assert.AreEqual(3, queue.Count);
+
+            Assert.AreEqual("a", queue.Dequeue());
+            Assert.AreEqual("b", queue.Dequeue());
+            Assert.AreEqual("c", queue.Dequeue());
+        }
+
+        [TestMethod]
+        public void Remove_First_Items()
+        {
+            var queue = new BlockingQueue<string>();
+            queue.Enqueue("a");
+            queue.Enqueue("b");
+            queue.Enqueue("c");
+
+            Assert.AreEqual("a", queue.RemoveFirst());
+            Assert.AreEqual("b", queue.RemoveFirst());
+            
+            Assert.AreEqual(1, queue.Count);
+
+            Assert.AreEqual("c", queue.Dequeue());
+        }
+
+        [TestMethod]
+        public void Clear_Items()
+        {
+            var queue = new BlockingQueue<string>();
+            queue.Enqueue("a");
+            queue.Enqueue("b");
+            queue.Enqueue("c");
+
+            Assert.AreEqual(3, queue.Count);
+
+            queue.Clear();
+
+            Assert.AreEqual(0, queue.Count);
+        }
+
+        [TestMethod]
+        public async Task Wait_For_Item()
+        {
+            var queue = new BlockingQueue<string>();
+
+            string item = null;
+#pragma warning disable CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
+            Task.Run(() =>
+            {
+                item = queue.Dequeue();
+            });
+#pragma warning restore CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
+
+            await Task.Delay(100);
+
+            Assert.AreEqual(0, queue.Count);
+            Assert.AreEqual(null, item);
+
+            queue.Enqueue("x");
+
+            await Task.Delay(100);
+
+            Assert.AreEqual("x", item);
+            Assert.AreEqual(0, queue.Count);
+        }
+
+        [TestMethod]
+        public void Wait_For_Times()
+        {
+            var number = 0;
+
+            var queue = new BlockingQueue<int>();
+
+#pragma warning disable CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
+            Task.Run(async () =>
+            {
+                while (true)
+                {
+                    queue.Enqueue(1);
+                    await Task.Delay(100);
+                }
+            });
+#pragma warning restore CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
+
+            while (number < 50)
+            {
+                queue.Dequeue();
+                Interlocked.Increment(ref number);
+            }
+        }
+    }
+}

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

@@ -3,16 +3,17 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <DebugType>Full</DebugType>
-    <TargetFramework>netcoreapp2.0</TargetFramework>
+    <TargetFramework>netcoreapp2.1</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>
     <PackageReference Include="MSTest.TestAdapter" Version="1.3.2" />
     <PackageReference Include="MSTest.TestFramework" Version="1.3.2" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.7.2" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.9.0" />
   </ItemGroup>
 
   <ItemGroup>
+    <ProjectReference Include="..\..\Source\MQTTnet.Extensions.ManagedClient\MQTTnet.Extensions.ManagedClient.csproj" />
     <ProjectReference Include="..\..\Source\MQTTnet\MQTTnet.csproj" />
   </ItemGroup>
 

Tests/MQTTnet.Core.Tests/ManagedMqttClientTests.cs

@@ -0,0 +1,38 @@
+using MQTTnet.Extensions.ManagedClient;
+using System.Threading.Tasks;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using MQTTnet.Server;
+
+namespace MQTTnet.Core.Tests
+{
+    [TestClass]
+    public class ManagedMqttClientTests
+    {
+        [TestMethod]
+        public async Task Drop_New_Messages_On_Full_Queue()
+        {
+            var factory = new MqttFactory();
+            var managedClient = factory.CreateManagedMqttClient();
+
+            var clientOptions = new ManagedMqttClientOptionsBuilder()
+                .WithMaxPendingMessages(5)
+                .WithPendingMessagesOverflowStrategy(MqttPendingMessagesOverflowStrategy.DropNewMessage);
+
+            clientOptions.WithClientOptions(o => o.WithTcpServer("localhost"));
+
+            await managedClient.StartAsync(clientOptions.Build());
+
+            await managedClient.PublishAsync(new MqttApplicationMessage { Topic = "1" });
+            await managedClient.PublishAsync(new MqttApplicationMessage { Topic = "2" });
+            await managedClient.PublishAsync(new MqttApplicationMessage { Topic = "3" });
+            await managedClient.PublishAsync(new MqttApplicationMessage { Topic = "4" });
+            await managedClient.PublishAsync(new MqttApplicationMessage { Topic = "5" });
+
+            await managedClient.PublishAsync(new MqttApplicationMessage { Topic = "6" });
+            await managedClient.PublishAsync(new MqttApplicationMessage { Topic = "7" });
+            await managedClient.PublishAsync(new MqttApplicationMessage { Topic = "8" });
+
+            Assert.AreEqual(5, managedClient.PendingApplicationMessagesCount);
+        }
+    }
+}

Tests/MQTTnet.Core.Tests/MqttServerTests.cs

@@ -5,9 +5,11 @@ using MQTTnet.Protocol;
 using MQTTnet.Server;
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
+using MQTTnet.Adapter;
 using MQTTnet.Implementations;
 
 namespace MQTTnet.Core.Tests
@@ -97,11 +99,11 @@ namespace MQTTnet.Core.Tests
                 c1.ApplicationMessageReceived += (_, __) => receivedMessagesCount++;
 
                 var message = new MqttApplicationMessageBuilder().WithTopic("a").WithAtLeastOnceQoS().Build();
-                
+
                 await c2.PublishAsync(message);
                 await Task.Delay(1000);
                 Assert.AreEqual(0, receivedMessagesCount);
-                
+
                 var subscribeEventCalled = false;
                 s.ClientSubscribedTopic += (_, e) =>
                     {
@@ -115,7 +117,7 @@ namespace MQTTnet.Core.Tests
                 await c2.PublishAsync(message);
                 await Task.Delay(500);
                 Assert.AreEqual(1, receivedMessagesCount);
-                
+
                 var unsubscribeEventCalled = false;
                 s.ClientUnsubscribedTopic += (_, e) =>
                 {
@@ -233,7 +235,7 @@ namespace MQTTnet.Core.Tests
                 await c1.PublishAsync(message);
             }
         }
-        
+
         [TestMethod]
         public async Task MqttServer_ShutdownDisconnectsClientsGracefully()
         {
@@ -302,6 +304,59 @@ namespace MQTTnet.Core.Tests
             Assert.AreEqual(clientConnectedCalled, clientDisconnectedCalled);
         }
 
+        [TestMethod]
+        public async Task MqttServer_LotsOfRetainedMessages()
+        {
+            const int ClientCount = 100;
+
+            var server = new MqttFactory().CreateMqttServer();
+            try
+            {
+                await server.StartAsync(new MqttServerOptionsBuilder().Build());
+
+                Parallel.For(
+                    0,
+                    ClientCount,
+                    new ParallelOptions { MaxDegreeOfParallelism = 10 },
+                    i =>
+                {
+                    using (var client = new MqttFactory().CreateMqttClient())
+                    {
+                        client.ConnectAsync(new MqttClientOptionsBuilder().WithTcpServer("localhost").Build())
+                            .GetAwaiter().GetResult();
+
+                        for (var j = 0; j < 10; j++)
+                        {
+                            // Clear retained message.
+                            client.PublishAsync(new MqttApplicationMessageBuilder().WithTopic("r" + i)
+                                .WithPayload(new byte[0]).WithRetainFlag().Build()).GetAwaiter().GetResult();
+
+                            // Set retained message.
+                            client.PublishAsync(new MqttApplicationMessageBuilder().WithTopic("r" + i)
+                                .WithPayload("value" + j).WithRetainFlag().Build()).GetAwaiter().GetResult();
+                        }
+
+                        client.DisconnectAsync().GetAwaiter().GetResult();
+                    }
+                });
+
+                await Task.Delay(100);
+
+                var retainedMessages = server.GetRetainedMessages();
+
+                Assert.AreEqual(ClientCount, retainedMessages.Count);
+
+                for (var i = 0; i < ClientCount; i++)
+                {
+                    Assert.IsTrue(retainedMessages.Any(m => m.Topic == "r" + i));
+                }
+            }
+            finally
+            {
+                await server.StopAsync();
+            }
+        }
+
         [TestMethod]
         public async Task MqttServer_RetainedMessagesFlow()
         {
@@ -552,6 +607,51 @@ namespace MQTTnet.Core.Tests
             Assert.IsTrue(bodyIsMatching);
         }
 
+        [TestMethod]
+        public async Task MqttServer_ConnectionDenied()
+        {
+            var server = new MqttFactory().CreateMqttServer();
+            var client = new MqttFactory().CreateMqttClient();
+
+            try
+            {
+                var options = new MqttServerOptionsBuilder().WithConnectionValidator(context =>
+                {
+                    context.ReturnCode = MqttConnectReturnCode.ConnectionRefusedNotAuthorized;
+                }).Build();
+
+                await server.StartAsync(options);
+
+
+                var clientOptions = new MqttClientOptionsBuilder()
+                    .WithTcpServer("localhost").Build();
+
+                try
+                {
+                    await client.ConnectAsync(clientOptions);
+                    Assert.Fail("An exception should be raised.");
+                }
+                catch (Exception exception)
+                {
+                    if (exception is MqttConnectingFailedException)
+                    {
+
+                    }
+                    else
+                    {
+                        Assert.Fail("Wrong exception.");
+                    }
+                }
+            }
+            finally
+            {
+                await client.DisconnectAsync();
+                await server.StopAsync();
+
+                client.Dispose();
+            }
+        }
+
         [TestMethod]
         public async Task MqttServer_SameClientIdConnectDisconnectEventOrder()
         {
@@ -600,6 +700,33 @@ namespace MQTTnet.Core.Tests
             Assert.IsFalse(connecteCalledBeforeConnectedClients, "ClientConnected was called before ClientDisconnect was called");
         }
 
+
+        [TestMethod]
+        public async Task MqttServer_StopAndRestart()
+        {
+            var server = new MqttFactory().CreateMqttServer();
+            await server.StartAsync(new MqttServerOptions());
+
+            var client = new MqttFactory().CreateMqttClient();
+            await client.ConnectAsync(new MqttClientOptionsBuilder().WithTcpServer("localhost").Build());
+            await server.StopAsync();
+
+            try
+            {
+                var client2 = new MqttFactory().CreateMqttClient();
+                await client2.ConnectAsync(new MqttClientOptionsBuilder().WithTcpServer("localhost").Build());
+
+                Assert.Fail("Connecting should fail.");
+            }
+            catch (Exception)
+            {
+            }
+
+            await server.StartAsync(new MqttServerOptions());
+            var client3 = new MqttFactory().CreateMqttClient();
+            await client3.ConnectAsync(new MqttClientOptionsBuilder().WithTcpServer("localhost").Build());
+        }
+
         private class TestStorage : IMqttServerStorage
         {
             public IList<MqttApplicationMessage> Messages = new List<MqttApplicationMessage>();
@@ -623,25 +750,24 @@ namespace MQTTnet.Core.Tests
             MqttQualityOfServiceLevel filterQualityOfServiceLevel,
             int expectedReceivedMessagesCount)
         {
-            var serverAdapter = new TestMqttServerAdapter();
-            var s = new MqttFactory().CreateMqttServer(new[] { serverAdapter }, new MqttNetLogger());
+            var s = new MqttFactory().CreateMqttServer();
 
             var receivedMessagesCount = 0;
             try
             {
                 await s.StartAsync(new MqttServerOptions());
 
-                var c1 = await serverAdapter.ConnectTestClient("c1");
-                var c2 = await serverAdapter.ConnectTestClient("c2");
-
+                var c1 = new MqttFactory().CreateMqttClient();
                 c1.ApplicationMessageReceived += (_, __) => receivedMessagesCount++;
-
+                await c1.ConnectAsync(new MqttClientOptionsBuilder().WithTcpServer("localhost").Build());
                 await c1.SubscribeAsync(new TopicFilterBuilder().WithTopic(topicFilter).WithQualityOfServiceLevel(filterQualityOfServiceLevel).Build());
+
+                var c2 = new MqttFactory().CreateMqttClient();
+                await c2.ConnectAsync(new MqttClientOptionsBuilder().WithTcpServer("localhost").Build());
                 await c2.PublishAsync(builder => builder.WithTopic(topic).WithPayload(new byte[0]).WithQualityOfServiceLevel(qualityOfServiceLevel));
 
                 await Task.Delay(500);
                 await c1.UnsubscribeAsync(topicFilter);
-
                 await Task.Delay(500);
             }
             finally

Tests/MQTTnet.Core.Tests/RoundtripTimeTests.cs

@@ -0,0 +1,53 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Threading.Tasks;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using MQTTnet.Client;
+using MQTTnet.Server;
+
+namespace MQTTnet.Core.Tests
+{
+    [TestClass]
+    public class RoundtripTimeTests
+    {
+        [TestMethod]
+        public async Task Round_Trip_Time()
+        {
+            var factory = new MqttFactory();
+            var server = factory.CreateMqttServer();
+            var receiverClient = factory.CreateMqttClient();
+            var senderClient = factory.CreateMqttClient();
+
+            await server.StartAsync(new MqttServerOptionsBuilder().Build());
+
+            await receiverClient.ConnectAsync(new MqttClientOptionsBuilder().WithTcpServer("localhost").Build());
+            await receiverClient.SubscribeAsync("#");
+
+            await senderClient.ConnectAsync(new MqttClientOptionsBuilder().WithTcpServer("localhost").Build());
+
+            TaskCompletionSource<string> response = null;
+
+            receiverClient.ApplicationMessageReceived += (sender, args) =>
+            {
+                response?.SetResult(args.ApplicationMessage.ConvertPayloadToString());
+            };
+
+            var times = new List<TimeSpan>();
+            var stopwatch = Stopwatch.StartNew();
+
+            for (var i = 0; i < 100; i++)
+            {
+                response = new TaskCompletionSource<string>();
+                await senderClient.PublishAsync("test", DateTime.UtcNow.Ticks.ToString());
+                response.Task.GetAwaiter().GetResult();
+
+                stopwatch.Stop();
+                times.Add(stopwatch.Elapsed);
+                stopwatch.Restart();
+            }
+
+            await server.StopAsync();
+        }
+    }
+}

Tests/MQTTnet.Core.Tests/TestServerExtensions.cs

@@ -11,19 +11,20 @@ namespace MQTTnet.Core.Tests
         /// publishes a message with a client and waits in the server until a message with the same topic is received
         /// </summary>
         /// <returns></returns>
-        public static async Task PublishAndWaitForAsync(this IMqttClient client, IMqttServer server, MqttApplicationMessage message) 
+        public static async Task PublishAndWaitForAsync(this IMqttClient client, IMqttServer server, MqttApplicationMessage message)
         {
             var tcs = new TaskCompletionSource<object>();
 
-            EventHandler<MqttApplicationMessageReceivedEventArgs> handler = (sender, args) =>
+            void Handler(object sender, MqttApplicationMessageReceivedEventArgs args)
             {
                 if (args.ApplicationMessage.Topic == message.Topic)
                 {
                     tcs.SetResult(true);
                 }
-            };
-            server.ApplicationMessageReceived += handler;
-            
+            }
+
+            server.ApplicationMessageReceived += Handler;
+
             try
             {
                 await client.PublishAsync(message).ConfigureAwait(false);
@@ -31,7 +32,7 @@ namespace MQTTnet.Core.Tests
             }
             finally
             {
-                server.ApplicationMessageReceived -= handler;
+                server.ApplicationMessageReceived -= Handler;
             }
         }
     }

Tests/MQTTnet.TestApp.AspNetCore2/MQTTnet.TestApp.AspNetCore2.csproj

@@ -10,8 +10,10 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.AspNetCore" Version="2.1.0" />
-    <PackageReference Include="Microsoft.AspNetCore.App" Version="2.1.0" />
+    <PackageReference Include="Microsoft.AspNetCore" Version="2.1.4" />
+    <PackageReference Include="Microsoft.AspNetCore.App" Version="2.1.5" />
+    <PackageReference Include="Microsoft.AspNetCore.Connections.Abstractions" Version="2.1.3" />
+    <PackageReference Include="Microsoft.AspNetCore.Http.Abstractions" Version="2.1.1" />
   </ItemGroup>
 
   <ItemGroup>

Tests/MQTTnet.TestApp.NetCore/MQTTnet.TestApp.NetCore.csproj

@@ -3,11 +3,11 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <DebugType>Full</DebugType>
-    <TargetFrameworks>netcoreapp2.0;net452;net461</TargetFrameworks>
+    <TargetFrameworks>netcoreapp2.1;net452;net461</TargetFrameworks>
   </PropertyGroup>
 
-  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Release|netcoreapp2.0|AnyCPU'">
-    <DefineConstants>RELEASE;NETCOREAPP2_0</DefineConstants>
+  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Release|netcoreapp2.1|AnyCPU'">
+    <DefineConstants>RELEASE;NETCOREAPP2_1</DefineConstants>
   </PropertyGroup>
 
   <ItemGroup>

Tests/MQTTnet.TestApp.UniversalWindows/MQTTnet.TestApp.UniversalWindows.csproj

@@ -142,10 +142,10 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.NETCore.UniversalWindowsPlatform">
-      <Version>6.1.5</Version>
+      <Version>6.1.9</Version>
     </PackageReference>
     <PackageReference Include="Microsoft.Toolkit.Uwp.UI.Controls">
-      <Version>3.0.0</Version>
+      <Version>4.0.0</Version>
     </PackageReference>
   </ItemGroup>
   <PropertyGroup Condition=" '$(VisualStudioVersion)' == '' or '$(VisualStudioVersion)' &lt; '14.0' ">