/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */

/*

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation;

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

#include "ns3/core-module.h"

#include "ns3/simulator-module.h"

#include "ns3/node-module.h"

#include "ns3/helper-module.h"

/*

 *  Simple point to point links:

 *

 *  n0 -- n1 -- n2 -- n3

 *

 *  n0 has UdpEchoClient 

 *  n3 has UdpEchoServer

 *

 *  n0 IP: 10.1.1.1

 *  n1 IP: 10.1.1.2, 10.1.2.1

 *  n2 IP: 10.1.2.2, 10.1.3.1

 *  n3 IP: 10.1.3.2

 *

 */

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("FirstScriptExample");

  int 

main (int argc, char *argv[])

{

  LogComponentEnable("UdpEchoClientApplication", LOG_LEVEL_INFO);

  LogComponentEnable("UdpEchoServerApplication", LOG_LEVEL_INFO);

  NodeContainer nodes12;

  nodes12.Create (2);

  NodeContainer nodes23;

  nodes23.Add (nodes12.Get (1));

  nodes23.Create (1);

  NodeContainer nodes34;

  nodes34.Add(nodes23.Get (1));

  nodes34.Create (1);

  PointToPointHelper pointToPoint;

  pointToPoint.SetDeviceAttribute ("DataRate", StringValue ("5Mbps"));

  pointToPoint.SetChannelAttribute ("Delay", StringValue ("2ms"));

  NodeContainer allNodes = NodeContainer (nodes12, nodes23.Get (1), nodes34.Get (1));

  // NixHelper to install nix-vector routing

  // on all nodes

  Ipv4NixVectorHelper nixRouting;

  Ipv4StaticRoutingHelper staticRouting;

  Ipv4ListRoutingHelper list;

  list.Add (staticRouting, 0);

  list.Add (nixRouting, 10);

  InternetStackHelper stack;

  stack.SetRoutingHelper (list);

  stack.Install (allNodes);

  NetDeviceContainer devices12;

  NetDeviceContainer devices23;

  NetDeviceContainer devices34;

  devices12 = pointToPoint.Install (nodes12);

  devices23 = pointToPoint.Install (nodes23);

  devices34 = pointToPoint.Install (nodes34);

  Ipv4AddressHelper address1;

  address1.SetBase ("10.1.1.0", "255.255.255.0");

  Ipv4AddressHelper address2;

  address2.SetBase ("10.1.2.0", "255.255.255.0");

  Ipv4AddressHelper address3;

  address3.SetBase ("10.1.3.0", "255.255.255.0");

  address1.Assign (devices12);

  address2.Assign (devices23);

  Ipv4InterfaceContainer interfaces = address3.Assign (devices34);

  UdpEchoServerHelper echoServer (9);

  ApplicationContainer serverApps = echoServer.Install (nodes34.Get (1));

  serverApps.Start (Seconds (1.0));

  serverApps.Stop (Seconds (10.0));

  UdpEchoClientHelper echoClient (interfaces.GetAddress (1), 9);

  echoClient.SetAttribute ("MaxPackets", UintegerValue (1));

  echoClient.SetAttribute ("Interval", TimeValue (Seconds (1.)));

  echoClient.SetAttribute ("PacketSize", UintegerValue (1024));

  ApplicationContainer clientApps = echoClient.Install (nodes12.Get (0));

  clientApps.Start (Seconds (2.0));

  clientApps.Stop (Seconds (10.0));

  Simulator::Run ();

  Simulator::Destroy ();

  return 0;

}