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

/*

 * Copyright (c) 2009 MIRKO BANCHI

 *

 * 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

 *

 * Author: Mirko Banchi <mk.banchi@gmail.com>

 */

#include "ns3/core-module.h"

#include "ns3/simulator-module.h"

#include "ns3/node-module.h"

#include "ns3/helper-module.h"

#include "ns3/wifi-module.h"

#include "ns3/mobility-module.h"

//This is a simple example in order to show how 802.11n frame aggregation feature (A-MSDU) works.

//

//Network topology:

// 

//  Wifi 192.168.1.0

// 

//             AP

//   *    *    *

//   |    |    |

//   n1   n2   n3 

//

//Packets in this simulation aren't marked with a QosTag so they are considered

//belonging to BestEffort Access Class (AC_BE).

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("SimpleWifiFrameAggregation");

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

{

  //LogComponentEnable ("EdcaTxopN", LOG_LEVEL_DEBUG);

  LogComponentEnable ("MsduAggregator", LOG_LEVEL_INFO);

  LogComponentEnable ("UdpEchoClientApplication", LOG_LEVEL_INFO);

  LogComponentEnable ("UdpEchoServerApplication", LOG_LEVEL_INFO);

  uint32_t nWifi = 1;

  CommandLine cmd;

  cmd.AddValue ("nWifi", "Number of wifi STA devices", nWifi);

  cmd.Parse (argc,argv);

  NodeContainer wifiNodes;

  wifiNodes.Create (2);

  NodeContainer wifiApNode;

  wifiApNode.Create (1);

  YansWifiChannelHelper channel = YansWifiChannelHelper::Default ();

  YansWifiPhyHelper phy = YansWifiPhyHelper::Default ();

  phy.SetChannel (channel.Create ());

  WifiHelper wifi = WifiHelper::Default ();

  QosWifiMacHelper mac = QosWifiMacHelper::Default ();

  wifi.SetRemoteStationManager ("ns3::AarfWifiManager", "FragmentationThreshold", UintegerValue (2500));

  Ssid ssid = Ssid ("ns-3-802.11n");

  mac.SetType ("ns3::QstaWifiMac", 

    "Ssid", SsidValue (ssid),

    "ActiveProbing", BooleanValue (false));

  mac.SetMsduAggregatorForAc (AC_BE, "ns3::MsduStandardAggregator", 

                                     "MaxAmsduSize", UintegerValue (3839));

  NetDeviceContainer staDevices;

  staDevices = wifi.Install (phy, mac, wifiNodes);

  mac.SetType ("ns3::QapWifiMac", 

    "Ssid", SsidValue (ssid));

  mac.SetMsduAggregatorForAc (AC_BE, "ns3::MsduStandardAggregator", 

                                     "MaxAmsduSize", UintegerValue (7935));

  NetDeviceContainer apDevice;

  apDevice = wifi.Install (phy, mac, wifiApNode);

  /* Setting mobility model */

  MobilityHelper mobility;

  mobility.SetPositionAllocator ("ns3::GridPositionAllocator",

    "MinX", DoubleValue (0.0),

    "MinY", DoubleValue (0.0),

    "DeltaX", DoubleValue (5.0),

    "DeltaY", DoubleValue (10.0),

    "GridWidth", UintegerValue (3),

    "LayoutType", StringValue ("RowFirst"));

  mobility.SetMobilityModel ("ns3::RandomWalk2dMobilityModel",

    "Bounds", RectangleValue (Rectangle (-50, 50, -50, 50)));

  mobility.Install (wifiNodes);

  mobility.SetMobilityModel ("ns3::ConstantPositionMobilityModel");

  mobility.Install (wifiApNode);

  /* Internet stack*/

  InternetStackHelper stack;

  stack.Install (wifiApNode);

  stack.Install (wifiNodes);

  Ipv4AddressHelper address;

  address.SetBase ("192.168.1.0", "255.255.255.0");

  Ipv4InterfaceContainer wifiNodesInterfaces;

  Ipv4InterfaceContainer apNodeInterface;

  wifiNodesInterfaces = address.Assign (staDevices);

  apNodeInterface = address.Assign (apDevice);

  /* Setting applications */

  UdpEchoServerHelper echoServer (9);

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

  serverApps.Start (Seconds (1.0));

  serverApps.Stop (Seconds (10.0));

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

  echoClient.SetAttribute ("MaxPackets", UintegerValue (3));

  echoClient.SetAttribute ("Interval", TimeValue (Seconds (0.000001)));

  echoClient.SetAttribute ("PacketSize", UintegerValue (1500));

  ApplicationContainer clientApps = 

    echoClient.Install (wifiNodes.Get (0));

  clientApps.Start (Seconds (2.0));

  clientApps.Stop (Seconds (10.0));

  Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

  Simulator::Stop (Seconds (10.0));

  phy.EnablePcap ("test-802.11n", 

    wifiNodes.Get (nWifi - 1)->GetId (), 0);

  Simulator::Run ();

  Simulator::Destroy ();

  return 0;

}