Added KeepAliveInterval setting for socket connections

CryptoExchange.Net/Clients/BaseSocketClient.cs

@@ -40,6 +40,10 @@ namespace CryptoExchange.Net
         /// </summary>
         protected int MaxSocketConnections { get; set; } = 9999;        
         /// <summary>
+        /// Keep alive interval for websocket connection
+        /// </summary>
+        protected TimeSpan KeepAliveInterval { get; set; } = TimeSpan.FromSeconds(10);
+        /// <summary>
         /// Delegate used for processing byte data received from socket connections before it is processed by handlers
         /// </summary>
         protected Func<byte[], string>? dataInterpreterBytes;
@@ -574,6 +578,7 @@ namespace CryptoExchange.Net
             if (ClientOptions.Proxy != null)
                 socket.SetProxy(ClientOptions.Proxy);
 
+            socket.KeepAliveInterval = KeepAliveInterval;
             socket.Timeout = ClientOptions.SocketNoDataTimeout;
             socket.DataInterpreterBytes = dataInterpreterBytes;
             socket.DataInterpreterString = dataInterpreterString;

CryptoExchange.Net/Interfaces/IWebsocket.cs

@@ -77,6 +77,10 @@ namespace CryptoExchange.Net.Interfaces
         /// </summary>
         TimeSpan Timeout { get; set; }
         /// <summary>
+        /// The interval at which to send a ping frame to the server
+        /// </summary>
+        TimeSpan KeepAliveInterval { get; set; }
+        /// <summary>
         /// Set a proxy to use when connecting
         /// </summary>
         /// <param name="proxy"></param>

CryptoExchange.Net/Sockets/CryptoExchangeWebSocketClient.cs

@@ -122,6 +122,9 @@ namespace CryptoExchange.Net.Sockets
         /// <inheritdoc />
         public TimeSpan Timeout { get; set; }
 
+        /// <inheritdoc />
+        public TimeSpan KeepAliveInterval { get; set; }
+
         /// <inheritdoc />
         public double IncomingKbps
         {
@@ -332,7 +335,7 @@ namespace CryptoExchange.Net.Sockets
             socket.Options.Cookies = cookieContainer;
             foreach (var header in headers)
                 socket.Options.SetRequestHeader(header.Key, header.Value);
-            socket.Options.KeepAliveInterval = TimeSpan.FromSeconds(10);
+            socket.Options.KeepAliveInterval = KeepAliveInterval;
             socket.Options.SetBuffer(65536, 65536); // Setting it to anything bigger than 65536 throws an exception in .net framework
             return socket;
         }