Practical 11:: Program to simulate UDP Server – Client communication.

/* -*- 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

*/

// Network topology

//

// n0 n1

// | |

// =======

// LAN

//

// - UDP flows from n0 to n1

#include <fstream>

#include “ns3/core-module.h”

#include “ns3/csma-module.h”

#include “ns3/applications-module.h”

#include “ns3/internet-module.h”

//netAnimation

#include “ns3/netanim-module.h”

#include “ns3/mobility-module.h”

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“UdpClientServerExample”);

int

main (int argc, char *argv[])

{

//

// Enable logging for UdpClient and

//

LogComponentEnable (“UdpClient”, LOG_LEVEL_INFO);LogComponentEnable (“UdpServer”, LOG_LEVEL_INFO);

bool useV6 = false;

Address serverAddress;

CommandLine cmd ( FILE );

cmd.AddValue (“useIpv6”, “Use Ipv6”, useV6);

cmd.Parse (argc, argv);

//

// Explicitly create the nodes required by the topology (shown above).

//

NS_LOG_INFO (“Create nodes.”);NodeContainer n;

n.Create (2);

InternetStackHelper internet;internet.Install (n);

NS_LOG_INFO (“Create channels.”);

//

// Explicitly create the channels required by the topology (shown above).

//

CsmaHelper csma;

csma.SetChannelAttribute (“DataRate”, DataRateValue (DataRate (5000000)));csma.SetChannelAttribute (“Delay”, TimeValue (MilliSeconds (2)));csma.SetDeviceAttribute (“Mtu”, UintegerValue (1400));

NetDeviceContainer d = csma.Install (n);

//

// We’ve got the “hardware” in place. Now we need to add IP addresses.

//

NS_LOG_INFO (“Assign IP Addresses.”);if (useV6 == false)

{

Ipv4AddressHelper ipv4;

ipv4.SetBase (“10.1.1.0”, “255.255.255.0”);

Ipv4InterfaceContainer i = ipv4.Assign (d);serverAddress = Address (i.GetAddress (1));

}

else

{

Ipv6AddressHelper ipv6;

ipv6.SetBase (“2001:0000:f00d:cafe::”, Ipv6Prefix (64));Ipv6InterfaceContainer i6 = ipv6.Assign (d);serverAddress = Address(i6.GetAddress (1,1));

}

NS_LOG_INFO (“Create Applications.”);

//

// Create one udpServer applications on node one.

//

uint16_t port = 4000;UdpServerHelper server (port);

ApplicationContainer apps = server.Install (n.Get (1));apps.Start (Seconds (1.0));

apps.Stop (Seconds (10.0));

//

// Create one UdpClient application to send UDP datagrams from node zero to

// node one.

//

uint32_t MaxPacketSize = 1024;

Time interPacketInterval = Seconds (0.05); uint32_t maxPacketCount = 320;UdpClientHelper client (serverAddress, port);

client.SetAttribute (“MaxPackets”, UintegerValue (maxPacketCount));client.SetAttribute (“Interval”, TimeValue (interPacketInterval));client.SetAttribute (“PacketSize”, UintegerValue (MaxPacketSize));apps = client.Install (n.Get (0));

apps.Start (Seconds (2.0));

apps.Stop (Seconds (10.0));

AnimationInterface anim(“udp-cs.xml”);

AnimationInterface::SetConstantPosition (n.Get(0), 10, 25);

AnimationInterface::SetConstantPosition(n.Get(1), 40,25);

anim.EnablePacketMetadata(true);

csma.EnablePcapAll(“udp-cs”);

//

// Now, do the actual simulation.

//

NS_LOG_INFO (“Run Simulation.”);Simulator::Run ();Simulator::Destroy ();NS_LOG_INFO (“Done.”);

}

Output:

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