Add flag for secure connections.

Source/MQTTnet/Implementations/MqttClientAdapterFactory.cs

@@ -1,6 +1,5 @@
 using System;
 using MQTTnet.Adapter;
-using MQTTnet.Client;
 using MQTTnet.Client.Options;
 using MQTTnet.Diagnostics;
 using MQTTnet.Formatter;

Source/MQTTnet/Implementations/MqttTcpChannel.Uwp.cs

@@ -36,6 +36,8 @@ namespace MQTTnet.Implementations
             _bufferSize = serverOptions.DefaultEndpointOptions.BufferSize;
 
             CreateStreams();
+
+            IsSecureConnection = socket.Information.ProtectionLevel >= SocketProtectionLevel.Tls12;
         }
 
         public static Func<MqttClientTcpOptions, IEnumerable<ChainValidationResult>> CustomIgnorableServerCertificateErrorsResolver { get; set; }
@@ -53,6 +55,8 @@ namespace MQTTnet.Implementations
             }
         }
 
+        public bool IsSecureConnection { get; }
+
         public async Task ConnectAsync(CancellationToken cancellationToken)
         {
             if (_socket == null)

Source/MQTTnet/Implementations/MqttTcpChannel.cs

@@ -27,6 +27,8 @@ namespace MQTTnet.Implementations
         {
             _clientOptions = clientOptions ?? throw new ArgumentNullException(nameof(clientOptions));
             _options = (MqttClientTcpOptions)clientOptions.ChannelOptions;
+
+            IsSecureConnection = clientOptions.ChannelOptions?.TlsOptions?.UseTls == true;
         }
 
         /// <summary>
@@ -37,6 +39,8 @@ namespace MQTTnet.Implementations
         {
             _socket = socket ?? throw new ArgumentNullException(nameof(socket));
 
+            IsSecureConnection = sslStream != null;
+
             CreateStream(sslStream);
         }
 
@@ -45,6 +49,8 @@ namespace MQTTnet.Implementations
 
         public string Endpoint => _socket?.RemoteEndPoint?.ToString();
 
+        public bool IsSecureConnection { get; }
+
         public async Task ConnectAsync(CancellationToken cancellationToken)
         {
             if (_socket == null)

Source/MQTTnet/Implementations/MqttWebSocketChannel.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Globalization;
 using System.Net;
 using System.Net.WebSockets;
 using System.Security.Cryptography.X509Certificates;
@@ -21,14 +22,18 @@ namespace MQTTnet.Implementations
             _options = options ?? throw new ArgumentNullException(nameof(options));
         }
 
-        public MqttWebSocketChannel(WebSocket webSocket, string endpoint)
+        public MqttWebSocketChannel(WebSocket webSocket, string endpoint, bool isSecureConnection)
         {
             _webSocket = webSocket ?? throw new ArgumentNullException(nameof(webSocket));
+
             Endpoint = endpoint;
+            IsSecureConnection = isSecureConnection;
         }
 
         public string Endpoint { get; }
 
+        public bool IsSecureConnection { get; private set; }
+
         public async Task ConnectAsync(CancellationToken cancellationToken)
         {
             var uri = _options.Uri;
@@ -83,6 +88,8 @@ namespace MQTTnet.Implementations
 
             await clientWebSocket.ConnectAsync(new Uri(uri), cancellationToken).ConfigureAwait(false);
             _webSocket = clientWebSocket;
+
+            IsSecureConnection = uri.StartsWith("wss://", StringComparison.OrdinalIgnoreCase);
         }
 
         public async Task DisconnectAsync(CancellationToken cancellationToken)