#include <iostream>

#include "ns3/internet-node.h"

#include "ns3/simulator.h"

#include "ns3/socket-factory.h"

#include "ns3/socket.h"

#include "ns3/inet-socket-address.h"

#include "ns3/nstime.h"

#include "ns3/packet.h"

using namespace ns3;

static void

GenerateTraffic (Ptr<Socket> socket, uint32_t size)

{

  std::cout << "at=" << Simulator::Now ().GetSeconds () << "s, tx bytes=" << size << std::endl;

  socket->Send (Create<Packet> (size));

  if (size > 0)

    {

      Simulator::Schedule (Seconds (0.5), &GenerateTraffic, socket, size - 50);

    }

  else

    {

      socket->Close ();

    }

}

static void

SocketPrinter (Ptr<Socket> socket, Ptr<Packet> packet, const Address &from)

{

  std::cout << "at=" << Simulator::Now ().GetSeconds () << "s, rx bytes=" << packet->GetSize () << std::endl;

}

static void

PrintTraffic (Ptr<Socket> socket)

{

  socket->SetRecvCallback (MakeCallback (&SocketPrinter));

}

void

RunSimulation (void)

{

  InterfaceId iid = InterfaceId::LookupByName ("Udp");

  Ptr<SocketFactory> socketFactory = a->QueryInterface<SocketFactory> (iid);

  Ptr<Socket> sink = socketFactory->CreateSocket ();

  InetSocketAddress local = InetSocketAddress (Ipv4Address::GetAny (), 80);

  sink->Bind (local);

  Ptr<Socket> source = socketFactory->CreateSocket ();

  InetSocketAddress remote = InetSocketAddress (Ipv4Address::GetLoopback (), 80);

  source->Connect (remote);

  GenerateTraffic (source, 500);

  PrintTraffic (sink);

  Simulator::Run ();

  Simulator::Destroy ();

}

int main (int argc, char *argv[])

{

  RunSimulation ();

  return 0;

}