KeepAliveDelay removed; ping frequency doubled instead if no activity in 1.5 x ping frequency

Lidgren.Network/NetConnection.Latency.cs

@@ -111,10 +111,6 @@ namespace Lidgren.Network
 			if (m_status == NetConnectionStatus.Disconnected || m_status == NetConnectionStatus.None)
 				return;
 
-			// in case of inactivity; send forced keepalive/ping
-			if (now > m_lastSendRespondedTo + m_peerConfiguration.m_keepAliveDelay)
-				m_nextPing = now;
-
 			// force ack sending?
 			if (now > m_nextForceAckTime)
 			{
@@ -141,7 +137,12 @@ namespace Lidgren.Network
 				now = NetTime.Now; // need exact number
 				m_lastSentPingNumber++;
 				m_lastPingSendTime = now;
-				m_nextPing = now + m_owner.Configuration.m_pingFrequency;
+
+				// in case of not heard for a while
+				if (now > m_lastSendRespondedTo + (m_owner.Configuration.m_pingFrequency * 1.5f))
+					m_nextPing = now + (m_owner.Configuration.m_pingFrequency * 0.5f); // double ping rate
+				else
+					m_nextPing = now + m_owner.Configuration.m_pingFrequency;
 
 				NetOutgoingMessage ping = m_owner.CreateMessage(1);
 				ping.m_libType = NetMessageLibraryType.Ping;

Lidgren.Network/NetPeerConfiguration.cs

@@ -48,7 +48,6 @@ namespace Lidgren.Network
 		internal float m_handshakeAttemptDelay;
 		internal int m_handshakeMaxAttempts;
 		internal float m_connectionTimeout;
-		internal float m_keepAliveDelay;
 		internal float m_pingFrequency;
 
 		// reliability
@@ -73,7 +72,6 @@ namespace Lidgren.Network
 			m_port = 0;
 			m_receiveBufferSize = 131071;
 			m_sendBufferSize = 131071;
-			m_keepAliveDelay = 4.0f;
 			m_connectionTimeout = 25;
 			m_maximumConnections = 16;
 			m_defaultOutgoingMessageCapacity = 8;
@@ -320,20 +318,6 @@ namespace Lidgren.Network
 			}
 		}
 
-		/// <summary>
-		/// Gets or sets the number of seconds of inactivity before sending an extra ping packet as keepalive. This should be shorter than ping interval.
-		/// </summary>
-		public float KeepAliveDelay
-		{
-			get { return m_keepAliveDelay; }
-			set
-			{
-				if (value < m_pingFrequency)
-					throw new NetException("Setting KeepAliveDelay to lower than ping frequency doesn't make sense!");
-				m_keepAliveDelay = value;
-			}
-		}
-
 		/// <summary>
 		/// Gets or sets the number of seconds of non-response before disconnecting because of time out. Cannot be changed once NetPeer is initialized.
 		/// </summary>

Samples/ChatClient/Form1.Designer.cs

@@ -63,6 +63,7 @@
 			this.button1.TabIndex = 2;
 			this.button1.Text = "Send";
 			this.button1.UseVisualStyleBackColor = true;
+			this.button1.Click += new System.EventHandler(this.button1_Click);
 			// 
 			// button2
 			// 

Samples/ChatClient/Form1.cs

@@ -38,5 +38,12 @@ namespace ChatClient
 			else
 				Program.SettingsWindow.Show();
 		}
+
+		private void button1_Click(object sender, EventArgs e)
+		{
+			string txt = textBox1.Text.Trim();
+			Program.Input(txt);
+			textBox1.Text = "";
+		}
 	}
 }

Samples/ChatClient/Program.cs

@@ -44,6 +44,9 @@ namespace ChatClient
 
 		public static void Input(string input)
 		{
+			if (string.IsNullOrEmpty(input))
+				return;
+
 			if (input.ToLowerInvariant().StartsWith("connect "))
 			{
 				string host = input.Substring(8).Trim();