Add more conversion methos for application message payloads

Source/MQTTnet/Client/Options/MqttClientCertificateValidationEventArgs.cs

@@ -10,20 +10,12 @@ namespace MQTTnet.Client
 {
     public sealed class MqttClientCertificateValidationEventArgs : EventArgs
     {
-        public MqttClientCertificateValidationEventArgs(X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors, IMqttClientChannelOptions clientOptions)
+        public X509Certificate Certificate { get; set; }
-        {
-            Certificate = certificate ?? throw new ArgumentNullException(nameof(certificate));
-            Chain = chain ?? throw new ArgumentNullException(nameof(chain));
-            SslPolicyErrors = sslPolicyErrors;
-            ClientOptions = clientOptions ?? throw new ArgumentNullException(nameof(clientOptions));
-        }
 
-        public X509Certificate Certificate { get; }
+        public X509Chain Chain { get; set; }
 
-        public X509Chain Chain { get; }
+        public SslPolicyErrors SslPolicyErrors { get; set; }
 
-        public IMqttClientChannelOptions ClientOptions { get; }
+        public IMqttClientChannelOptions ClientOptions { get; set; }
-
-        public SslPolicyErrors SslPolicyErrors { get; }
     }
 }

Source/MQTTnet/Client/Options/MqttClientDefaultCertificateValidationHandler.cs

@@ -12,14 +12,7 @@ namespace MQTTnet.Client
     {
         public static bool Handle(MqttClientCertificateValidationEventArgs eventArgs)
         {
-            var sslPolicyErrors = eventArgs.SslPolicyErrors;
+            if (eventArgs.SslPolicyErrors == SslPolicyErrors.None)
-            
-            if (eventArgs.ClientOptions?.TlsOptions?.IgnoreCertificateChainErrors ?? false)
-            {
-                sslPolicyErrors &= ~SslPolicyErrors.RemoteCertificateChainErrors;
-            }
-            
-            if (sslPolicyErrors == SslPolicyErrors.None)
             {
                 return true;
             }

Source/MQTTnet/Client/Options/MqttClientOptionsBuilderTlsParameters.cs

@@ -14,7 +14,7 @@ namespace MQTTnet.Client
     {
         public bool UseTls { get; set; }
         
-        public Func<MqttClientCertificateValidationEventArgs, bool> CertificateValidationHandler { get; set; } = MqttClientDefaultCertificateValidationHandler.Handle;
+        public Func<MqttClientCertificateValidationEventArgs, bool> CertificateValidationHandler { get; set; }
 
 #if NET48 || NETCOREAPP3_1 || NET5 || NET6
         public SslProtocols SslProtocol { get; set; } = SslProtocols.Tls12 | SslProtocols.Tls13;

Source/MQTTnet/Client/Options/MqttClientTlsOptions.cs

@@ -11,7 +11,7 @@ namespace MQTTnet.Client
 {
     public sealed class MqttClientTlsOptions
     {
-        public Func<MqttClientCertificateValidationEventArgs, bool> CertificateValidationHandler { get; set; } = MqttClientDefaultCertificateValidationHandler.Handle;
+        public Func<MqttClientCertificateValidationEventArgs, bool> CertificateValidationHandler { get; set; }
 
         public bool UseTls { get; set; }
 

Source/MQTTnet/Implementations/MqttTcpChannel.cs

@@ -264,15 +264,27 @@ namespace MQTTnet.Implementations
             }
         }
 
-        bool InternalUserCertificateValidationCallback(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
+        bool InternalUserCertificateValidationCallback(object sender, X509Certificate x509Certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
         {
             var certificateValidationHandler = _tcpOptions?.TlsOptions?.CertificateValidationHandler;
             if (certificateValidationHandler != null)
             {
-                var eventArgs = new MqttClientCertificateValidationEventArgs(certificate, chain, sslPolicyErrors, _tcpOptions);
+                var eventArgs = new MqttClientCertificateValidationEventArgs
+                {
+                    Certificate = x509Certificate,
+                    Chain = chain,
+                    SslPolicyErrors = sslPolicyErrors,
+                    ClientOptions = _tcpOptions
+                };
+
                 return certificateValidationHandler(eventArgs);
             }
 
+            if (_tcpOptions?.TlsOptions?.IgnoreCertificateChainErrors ?? false)
+            {
+                sslPolicyErrors &= ~SslPolicyErrors.RemoteCertificateChainErrors;
+            }
+
             return sslPolicyErrors == SslPolicyErrors.None;
         }
 

Source/MQTTnet/Implementations/MqttWebSocketChannel.cs

@@ -224,7 +224,14 @@ namespace MQTTnet.Implementations
                 clientWebSocket.Options.RemoteCertificateValidationCallback = (sender, certificate, chain, sslPolicyErrors) =>
                 {
                     // TODO: Find a way to add client options to same callback. Problem is that they have a different type.
-                    var context = new MqttClientCertificateValidationEventArgs(certificate, chain, sslPolicyErrors, _options);
+                    var context = new MqttClientCertificateValidationEventArgs
+                    {
+                        Certificate = certificate,
+                        Chain = chain,
+                        SslPolicyErrors = sslPolicyErrors,
+                        ClientOptions = _options
+                    };
+
                     return certificateValidationHandler(context);
                 };
 #endif

Source/MQTTnet/MqttApplicationMessageExtensions.cs

@@ -5,13 +5,78 @@
 using System;
 using System.Text;
 
+// ReSharper disable MemberCanBePrivate.Global
+
 namespace MQTTnet
 {
     public static class MqttApplicationMessageExtensions
     {
+        public static short ConvertPayloadToByte(this MqttApplicationMessage applicationMessage)
+        {
+            if (applicationMessage == null)
+            {
+                throw new ArgumentNullException(nameof(applicationMessage));
+            }
+
+            if (applicationMessage.Payload.Length != 1)
+            {
+                throw new ArgumentException("Payload requires to be 1 bytes long.");
+            }
+
+            return applicationMessage.Payload[0];
+        }
+
+        public static short ConvertPayloadToInt16(this MqttApplicationMessage applicationMessage)
+        {
+            if (applicationMessage == null)
+            {
+                throw new ArgumentNullException(nameof(applicationMessage));
+            }
+
+            if (applicationMessage.Payload.Length != 2)
+            {
+                throw new ArgumentException("Payload requires to be 2 bytes long.");
+            }
+
+            return BitConverter.ToInt16(applicationMessage.Payload, 0);
+        }
+
+        public static int ConvertPayloadToInt32(this MqttApplicationMessage applicationMessage)
+        {
+            if (applicationMessage == null)
+            {
+                throw new ArgumentNullException(nameof(applicationMessage));
+            }
+
+            if (applicationMessage.Payload?.Length != 4)
+            {
+                throw new ArgumentException("Payload requires to be 4 bytes long.");
+            }
+
+            return BitConverter.ToInt32(applicationMessage.Payload, 0);
+        }
+
+        public static long ConvertPayloadToInt64(this MqttApplicationMessage applicationMessage)
+        {
+            if (applicationMessage == null)
+            {
+                throw new ArgumentNullException(nameof(applicationMessage));
+            }
+
+            if (applicationMessage.Payload.Length != 8)
+            {
+                throw new ArgumentException("Payload requires to be 8 bytes long.");
+            }
+
+            return BitConverter.ToInt64(applicationMessage.Payload, 0);
+        }
+
         public static string ConvertPayloadToString(this MqttApplicationMessage applicationMessage)
         {
-            if (applicationMessage == null) throw new ArgumentNullException(nameof(applicationMessage));
+            if (applicationMessage == null)
+            {
+                throw new ArgumentNullException(nameof(applicationMessage));
+            }
 
             if (applicationMessage.Payload == null)
             {
@@ -25,5 +90,65 @@ namespace MQTTnet
 
             return Encoding.UTF8.GetString(applicationMessage.Payload, 0, applicationMessage.Payload.Length);
         }
+
+        public static decimal ParsePayloadToDecimal(this MqttApplicationMessage applicationMessage)
+        {
+            if (applicationMessage == null)
+            {
+                throw new ArgumentNullException(nameof(applicationMessage));
+            }
+
+            return decimal.Parse(ConvertPayloadToString(applicationMessage));
+        }
+
+        public static double ParsePayloadToDouble(this MqttApplicationMessage applicationMessage)
+        {
+            if (applicationMessage == null)
+            {
+                throw new ArgumentNullException(nameof(applicationMessage));
+            }
+
+            return double.Parse(ConvertPayloadToString(applicationMessage));
+        }
+
+        public static short ParsePayloadToInt16(this MqttApplicationMessage applicationMessage)
+        {
+            if (applicationMessage == null)
+            {
+                throw new ArgumentNullException(nameof(applicationMessage));
+            }
+
+            return short.Parse(ConvertPayloadToString(applicationMessage));
+        }
+
+        public static int ParsePayloadToInt32(this MqttApplicationMessage applicationMessage)
+        {
+            if (applicationMessage == null)
+            {
+                throw new ArgumentNullException(nameof(applicationMessage));
+            }
+
+            return int.Parse(ConvertPayloadToString(applicationMessage));
+        }
+
+        public static long ParsePayloadToInt64(this MqttApplicationMessage applicationMessage)
+        {
+            if (applicationMessage == null)
+            {
+                throw new ArgumentNullException(nameof(applicationMessage));
+            }
+
+            return long.Parse(ConvertPayloadToString(applicationMessage));
+        }
+
+        public static float ParsePayloadToSingle(this MqttApplicationMessage applicationMessage)
+        {
+            if (applicationMessage == null)
+            {
+                throw new ArgumentNullException(nameof(applicationMessage));
+            }
+
+            return float.Parse(ConvertPayloadToString(applicationMessage));
+        }
     }
 }