/* -*- 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

 */

// Port of ns-2/tcl/ex/simple.tcl to ns-3

//

// Network topology

//

//       n0    n1   n2   n3

//       |     |    |    |

//     =====================

//

// - CBR/UDP flows from n0 to n1, and from n3 to n0

// - UDP packet size of 210 bytes, with per-packet interval 0.00375 sec.

//   (i.e., DataRate of 448,000 bps)

// - DropTail queues 

// - Tracing of queues and packet receptions to file "csma-one-subnet.tr"

#include <iostream>

#include <fstream>

#include <string>

#include <cassert>

#include "ns3/core-module.h"

#include "ns3/simulator-module.h"

#include "ns3/node-module.h"

#include "ns3/helper-module.h"

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("CsmaPacketSocketExample");

int

main (int argc, char *argv[])

{

#if 0 

  LogComponentEnable ("CsmaPacketSocketExample", LOG_LEVEL_INFO);

#endif

  //

  // Make the random number generators generate reproducible results.

  //

  RandomVariable::UseGlobalSeed (1, 1, 2, 3, 5, 8);

  CommandLine cmd;

  cmd.Parse (argc, argv);

  // Here, we will explicitly create four nodes.

  NS_LOG_INFO ("Create nodes.");

  NodeContainer c;

  c.Create (4);

  PacketSocketHelper packetSocket;

  packetSocket.Install (c);

  // create the shared medium used by all csma devices.

  NS_LOG_INFO ("Create channels.");

  Ptr<CsmaChannel> channel = CreateObject<CsmaChannel> ("BitRate", DataRateValue (DataRate(5000000)), 

                                                        "Delay", TimeValue (MilliSeconds(2)));

  // use a helper function to connect our nodes to the shared channel.

  NS_LOG_INFO ("Build Topology.");

  CsmaHelper csma;

  csma.SetDeviceParameter ("EncapsulationMode", StringValue ("Llc"));

  NetDeviceContainer devs = csma.Install (c, channel);

  NS_LOG_INFO ("Create Applications.");

  // Create the OnOff application to send raw datagrams

  PacketSocketAddress socket;

  socket.SetSingleDevice(devs.Get (0)->GetIfIndex ());

  socket.SetPhysicalAddress (devs.Get (1)->GetAddress ());

  socket.SetProtocol (2);

  OnOffHelper onoff ("ns3::PacketSocketFactory", Address (socket));

  onoff.SetAttribute ("OnTime", RandomVariableValue (ConstantVariable (1.0)));

  onoff.SetAttribute ("OffTime", RandomVariableValue (ConstantVariable (0.0)));

  ApplicationContainer apps = onoff.Install (c.Get (0));

  apps.Start (Seconds (1.0));

  apps.Stop (Seconds (10.0));

  socket.SetSingleDevice (devs.Get (3)->GetIfIndex ());

  socket.SetPhysicalAddress (devs.Get (0)->GetAddress ());

  socket.SetProtocol (3);

  onoff.SetAttribute ("Remote", AddressValue (socket));

  onoff.SetAttribute ("OffTime", RandomVariableValue (ConstantVariable (0.0)));

  apps = onoff.Install (c.Get (3));

  apps.Start (Seconds (1.0));

  apps.Stop (Seconds (10.0));

  // Configure tracing of all enqueue, dequeue, and NetDevice receive events

  // Trace output will be sent to the csma-packet-socket.tr file

  NS_LOG_INFO ("Configure Tracing.");

  std::ofstream os;

  os.open ("csma-packet-socket.tr");

  csma.EnableAsciiAll (os);

  NS_LOG_INFO ("Run Simulation.");

  Simulator::Run ();

  Simulator::Destroy ();

  NS_LOG_INFO ("Done.");

}