Progress on tutorial, gap tweaking (water flows faster from room to room), UPnP error messages, input keys in array, underwater aiming tweaking, tons of misc stuff commit more often ffs

Lidgren.Network/NetPeer.Discovery.cs

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+using System;
+using System.Net;
+
+namespace Lidgren.Network
+{
+	public partial class NetPeer
+	{
+		/// <summary>
+		/// Emit a discovery signal to all hosts on your subnet
+		/// </summary>
+		public void DiscoverLocalPeers(int serverPort)
+		{
+			NetOutgoingMessage om = CreateMessage(0);
+			om.m_messageType = NetMessageType.Discovery;
+			m_unsentUnconnectedMessages.Enqueue(new NetTuple<IPEndPoint, NetOutgoingMessage>(new IPEndPoint(IPAddress.Broadcast, serverPort), om));
+		}
+
+		/// <summary>
+		/// Emit a discovery signal to a single known host
+		/// </summary>
+		public bool DiscoverKnownPeer(string host, int serverPort)
+		{
+			IPAddress address = NetUtility.Resolve(host);
+			if (address == null)
+				return false;
+			DiscoverKnownPeer(new IPEndPoint(address, serverPort));
+			return true;
+		}
+
+		/// <summary>
+		/// Emit a discovery signal to a single known host
+		/// </summary>
+		public void DiscoverKnownPeer(IPEndPoint endPoint)
+		{
+			NetOutgoingMessage om = CreateMessage(0);
+			om.m_messageType = NetMessageType.Discovery;
+			m_unsentUnconnectedMessages.Enqueue(new NetTuple<IPEndPoint, NetOutgoingMessage>(endPoint, om));
+		}
+
+		/// <summary>
+		/// Send a discovery response message
+		/// </summary>
+		public void SendDiscoveryResponse(NetOutgoingMessage msg, IPEndPoint recipient)
+		{
+			if (recipient == null)
+				throw new ArgumentNullException("recipient");
+
+			if (msg == null)
+				msg = CreateMessage(0);
+			else if (msg.m_isSent)
+				throw new NetException("Message has already been sent!");
+
+			if (msg.LengthBytes >= m_configuration.MaximumTransmissionUnit)
+				throw new NetException("Cannot send discovery message larger than MTU (currently " + m_configuration.MaximumTransmissionUnit + " bytes)");
+
+			msg.m_messageType = NetMessageType.DiscoveryResponse;
+			m_unsentUnconnectedMessages.Enqueue(new NetTuple<IPEndPoint, NetOutgoingMessage>(recipient, msg));
+		}
+	}
+}