VANET仿真-ns3(1)

#include "ns3/core-module.h"
#include "ns3/network-module.h"
#include "ns3/internet-module.h"
#include "ns3/point-to-point-module.h"
#include "ns3/applications-module.h"

//namespace 定义之后，所有命令行的参数都需要用ns::的形式来表示
using namespace ns3;

//定义日志的组成部分
NS_LOG_COMPONENT_DEFINE ("FirstScriptExample");

int
main (int argc, char \*argv[])
{
  //开启命令行参数，可以设置全局变量、属性等，可以用./waf --run "scratch/myfirst --PrintHelp"查看帮助信息
  CommandLine cmd;
  cmd.Parse (argc, argv);

  Time::SetResolution (Time::NS); //时间被设定成纳秒级别
  LogComponentEnable ("UdpEchoClientApplication", LOG_LEVEL_INFO);
  LogComponentEnable ("UdpEchoServerApplication", LOG_LEVEL_INFO);

  NodeContainer nodes;
  nodes.Create (2);

  PointToPointHelper pointToPoint;
  //实例化一个点对点模型
  //有两种方式可以设置节点参数，一种可以通过下面的方式修改，
  //另一种通过命令行./waf --run "scratch/myfirst --ns3::PointToPointNetDevice::DataRate=5Mbps --ns3::PointToPointChannel::Delay=2ms"
  pointToPoint.SetDeviceAttribute ("DataRate", StringValue ("5Mbps"));
  pointToPoint.SetChannelAttribute ("Delay", StringValue ("2ms"));

  NetDeviceContainer devices;
  devices = pointToPoint.Install (nodes);

  //协议栈，包括TCP，UDP，IP等
  InternetStackHelper stack;
  stack.Install (nodes);

  //设定地址掩码等信息
  Ipv4AddressHelper address;
  address.SetBase ("10.1.1.0", "255.255.255.0");

  //通过下面的函数将ipv4地址与设备链接起来
  Ipv4InterfaceContainer interfaces = address.Assign (devices);

  //设置udp端口号为9
  UdpEchoServerHelper echoServer (9);

  //install函数就是把节点挂载到server上
  ApplicationContainer serverApps = echoServer.Install (nodes.Get (1));
  serverApps.Start (Seconds (1.0));
  serverApps.Stop (Seconds (10.0));

  //client上五个属性分别为节点地址、端口号、包数量、间隔、包大小
  UdpEchoClientHelper echoClient (interfaces.GetAddress (1), 9);
  echoClient.SetAttribute ("MaxPackets", UintegerValue (1));
  echoClient.SetAttribute ("Interval", TimeValue (Seconds (1.0)));
  echoClient.SetAttribute ("PacketSize", UintegerValue (1024));

  ApplicationContainer clientApps = echoClient.Install (nodes.Get (0));
  clientApps.Start (Seconds (2.0));
  clientApps.Stop (Seconds (10.0));

  //开始仿真、结束仿真
  Simulator::Run ();
  Simulator::Destroy ();
  return 0;
}