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

/*

 * Copyright (c) 2009 The Boeing Company

 *

 * 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

 *

 */

// 

// This script configures two nodes on an 802.11b physical layer, with

// 802.11b NICs in infrastructure mode, and by default, the station sends 

// one packet of 1000 (application) bytes to the access point.  The 

// physical layer is configured

// to receive at a fixed RSS (regardless of the distance and transmit

// power); therefore, changing position of the nodes has no effect. 

//

// There are a number of command-line options available to control

// the default behavior.  The list of available command-line options

// can be listed with the following command:

// ./waf --run "wifi-simple-infra --help"

//

// For instance, for this configuration, the physical layer will

// stop successfully receiving packets when rss drops below -97 dBm.

// To see this effect, try running:

//

// ./waf --run "wifi-simple-infra --rss=-97 --numPackets=20"

// ./waf --run "wifi-simple-infra --rss=-98 --numPackets=20"

// ./waf --run "wifi-simple-infra --rss=-99 --numPackets=20"

//

// Note that all ns-3 attributes (not just the ones exposed in the below

// script) can be changed at command line; see the documentation.

//

// This script can also be helpful to put the Wifi layer into verbose

// logging mode; this command will turn on all wifi logging:

// 

// ./waf --run "wifi-simple-infra --verbose=1"

//

// When you are done, you will notice two pcap trace files in your directory.

// If you have tcpdump installed, you can try this:

//

// tcpdump -r wifi-simple-infra-0-0.pcap -nn -tt

//

#include "ns3/core-module.h"

#include "ns3/network-module.h"

#include "ns3/mobility-module.h"

#include "ns3/config-store-module.h"

#include "ns3/wifi-module.h"

#include "ns3/internet-module.h"

#include <iostream>

#include <fstream>

#include <vector>

#include <string>

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("WifiSimpleInfra");

void ReceivePacket (Ptr<Socket> socket)

{

  while (socket->Recv ())

    {

      NS_LOG_UNCOND ("Received one packet!");

    }

}

static void GenerateTraffic (Ptr<Socket> socket, uint32_t pktSize, 

                             uint32_t pktCount, Time pktInterval )

{

  if (pktCount > 0)

    {

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

      Simulator::Schedule (pktInterval, &GenerateTraffic, 

                           socket, pktSize,pktCount-1, pktInterval);

    }

  else

    {

      socket->Close ();

    }

}

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

{

  std::string phyMode ("DsssRate1Mbps");

  double rss = -80;  // -dBm

  uint32_t packetSize = 1000; // bytes

  uint32_t numPackets = 1;

  double interval = 1.0; // seconds

  bool verbose = false;

  CommandLine cmd;

  cmd.AddValue ("phyMode", "Wifi Phy mode", phyMode);

  cmd.AddValue ("rss", "received signal strength", rss);

  cmd.AddValue ("packetSize", "size of application packet sent", packetSize);

  cmd.AddValue ("numPackets", "number of packets generated", numPackets);

  cmd.AddValue ("interval", "interval (seconds) between packets", interval);

  cmd.AddValue ("verbose", "turn on all WifiNetDevice log components", verbose);

  cmd.Parse (argc, argv);

  // Convert to time object

  Time interPacketInterval = Seconds (interval);

  // disable fragmentation for frames below 2200 bytes

  Config::SetDefault ("ns3::WifiRemoteStationManager::FragmentationThreshold", StringValue ("2200"));

  // turn off RTS/CTS for frames below 2200 bytes

  Config::SetDefault ("ns3::WifiRemoteStationManager::RtsCtsThreshold", StringValue ("2200"));

  // Fix non-unicast data rate to be the same as that of unicast

  Config::SetDefault ("ns3::WifiRemoteStationManager::NonUnicastMode", 

                      StringValue (phyMode));

  NodeContainer c;

  c.Create (2);

  // The below set of helpers will help us to put together the wifi NICs we want

  WifiHelper wifi;

  if (verbose)

    {

      wifi.EnableLogComponents ();  // Turn on all Wifi logging

    }

  wifi.SetStandard (WIFI_PHY_STANDARD_80211b);

  YansWifiPhyHelper wifiPhy =  YansWifiPhyHelper::Default ();

  // This is one parameter that matters when using FixedRssLossModel

  // set it to zero; otherwise, gain will be added

  wifiPhy.Set ("RxGain", DoubleValue (0) ); 

  // ns-3 supports RadioTap and Prism tracing extensions for 802.11b

  wifiPhy.SetPcapDataLinkType (YansWifiPhyHelper::DLT_IEEE802_11_RADIO); 

  YansWifiChannelHelper wifiChannel;

  wifiChannel.SetPropagationDelay ("ns3::ConstantSpeedPropagationDelayModel");

  // The below FixedRssLossModel will cause the rss to be fixed regardless

  // of the distance between the two stations, and the transmit power

  wifiChannel.AddPropagationLoss ("ns3::FixedRssLossModel","Rss",DoubleValue (rss));

  wifiPhy.SetChannel (wifiChannel.Create ());

  // Add a non-QoS upper mac, and disable rate control

  NqosWifiMacHelper wifiMac = NqosWifiMacHelper::Default ();

  wifi.SetRemoteStationManager ("ns3::ConstantRateWifiManager",

                                "DataMode",StringValue (phyMode),

                                "ControlMode",StringValue (phyMode));

  // Setup the rest of the upper mac

  Ssid ssid = Ssid ("wifi-default");

  // setup sta.

  wifiMac.SetType ("ns3::StaWifiMac",

                   "Ssid", SsidValue (ssid),

                   "ActiveProbing", BooleanValue (false));

  NetDeviceContainer staDevice = wifi.Install (wifiPhy, wifiMac, c.Get (0));

  NetDeviceContainer devices = staDevice;

  // setup ap.

  wifiMac.SetType ("ns3::ApWifiMac",

                   "Ssid", SsidValue (ssid));

  NetDeviceContainer apDevice = wifi.Install (wifiPhy, wifiMac, c.Get (1));

  devices.Add (apDevice);

  // Note that with FixedRssLossModel, the positions below are not 

  // used for received signal strength. 

  MobilityHelper mobility;

  Ptr<ListPositionAllocator> positionAlloc = CreateObject<ListPositionAllocator> ();

  positionAlloc->Add (Vector (0.0, 0.0, 0.0));

  positionAlloc->Add (Vector (5.0, 0.0, 0.0));

  mobility.SetPositionAllocator (positionAlloc);

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

  mobility.Install (c);

  InternetStackHelper internet;

  internet.Install (c);

  Ipv4AddressHelper ipv4;

  NS_LOG_INFO ("Assign IP Addresses.");

  ipv4.SetBase ("10.1.1.0", "255.255.255.0");

  Ipv4InterfaceContainer i = ipv4.Assign (devices);

  TypeId tid = TypeId::LookupByName ("ns3::UdpSocketFactory");

  Ptr<Socket> recvSink = Socket::CreateSocket (c.Get (0), tid);

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

  recvSink->Bind (local);

  recvSink->SetRecvCallback (MakeCallback (&ReceivePacket));

  Ptr<Socket> source = Socket::CreateSocket (c.Get (1), tid);

  InetSocketAddress remote = InetSocketAddress (Ipv4Address ("255.255.255.255"), 80);

  source->SetAllowBroadcast (true);

  source->Connect (remote);

  // Tracing

  wifiPhy.EnablePcap ("wifi-simple-infra", devices);

  // Output what we are doing

  NS_LOG_UNCOND ("Testing " << numPackets  << " packets sent with receiver rss " << rss );

  Simulator::ScheduleWithContext (source->GetNode ()->GetId (),

                                  Seconds (1.0), &GenerateTraffic, 

                                  source, packetSize, numPackets, interPacketInterval);

  Simulator::Stop (Seconds (30.0));

  Simulator::Run ();

  Simulator::Destroy ();

  return 0;

}