Failed to test the Config connection with third.cc

[Fan Wu]

Hi, everybody. I am a beginner of studying NS-3. I use the version of 3.26. When I test the Chapter 7.2.2 of tutorial, I find that the connections are of no use. The concrete cases are below and  I mark the extra parts between "////////".

1 For Config::Connect()

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("ThirdScriptExample");

/////// //////////////////////////////////////////The function below is completely same as the tutorial./////////////////////////////////

void 

CourseChange(std::string context, Ptr<const MobilityModel> model)

{

 Vector position = model->GetPosition();

 NS_LOG_UNCOND(context<< "x= " << position.x << ",y= " << position.y);

}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////

int

main (int argc, char *argv[])

{

  bool verbose = true;

  uint32_t nCsma = 3;

  uint32_t nWifi = 3;

  bool tracing = false;

  CommandLine cmd;

  cmd.AddValue ("nCsma", "Number of \"extra\" CSMA nodes/devices", nCsma);

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

  cmd.AddValue ("verbose", "Tell echo applications to log if true", verbose);

  cmd.AddValue ("tracing", "Enable pcap tracing", tracing);

  cmd.Parse (argc,argv);

  // Check for valid number of csma or wifi nodes

  // 250 should be enough, otherwise IP addresses 

  // soon become an issue

  if (nWifi > 250 || nCsma > 250)

    {

      std::cout << "Too many wifi or csma nodes, no more than 250 each." << std::endl;

      return 1;

    }

  if (verbose)

    {

      LogComponentEnable ("UdpEchoClientApplication", LOG_LEVEL_INFO);

      LogComponentEnable ("UdpEchoServerApplication", LOG_LEVEL_INFO);

    }

  NodeContainer p2pNodes;

  p2pNodes.Create (2);

  PointToPointHelper pointToPoint;

  pointToPoint.SetDeviceAttribute ("DataRate", StringValue ("5Mbps"));

  pointToPoint.SetChannelAttribute ("Delay", StringValue ("2ms"));

  NetDeviceContainer p2pDevices;

  p2pDevices = pointToPoint.Install (p2pNodes);

  NodeContainer csmaNodes;

  csmaNodes.Add (p2pNodes.Get (1));

  csmaNodes.Create (nCsma);

  CsmaHelper csma;

  csma.SetChannelAttribute ("DataRate", StringValue ("100Mbps"));

  csma.SetChannelAttribute ("Delay", TimeValue (NanoSeconds (6560)));

  NetDeviceContainer csmaDevices;

  csmaDevices = csma.Install (csmaNodes);

  NodeContainer wifiStaNodes;

  wifiStaNodes.Create (nWifi);

  NodeContainer wifiApNode = p2pNodes.Get (0);

  YansWifiChannelHelper channel = YansWifiChannelHelper::Default ();

  YansWifiPhyHelper phy = YansWifiPhyHelper::Default ();

  phy.SetChannel (channel.Create ());

  WifiHelper wifi;

  wifi.SetRemoteStationManager ("ns3::AarfWifiManager");

  WifiMacHelper mac;

  Ssid ssid = Ssid ("ns-3-ssid");

  mac.SetType ("ns3::StaWifiMac",

               "Ssid", SsidValue (ssid),

               "ActiveProbing", BooleanValue (false));

  NetDeviceContainer staDevices;

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

  mac.SetType ("ns3::ApWifiMac",

               "Ssid", SsidValue (ssid));

  NetDeviceContainer apDevices;

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

  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 (wifiStaNodes);

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

  mobility.Install (wifiApNode);

  InternetStackHelper stack;

  stack.Install (csmaNodes);

  stack.Install (wifiApNode);

  stack.Install (wifiStaNodes);

  Ipv4AddressHelper address;

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

  Ipv4InterfaceContainer p2pInterfaces;

  p2pInterfaces = address.Assign (p2pDevices);

  address.SetBase ("10.1.2.0", "255.255.255.0");

  Ipv4InterfaceContainer csmaInterfaces;

  csmaInterfaces = address.Assign (csmaDevices);

  address.SetBase ("10.1.3.0", "255.255.255.0");

  address.Assign (staDevices);

  address.Assign (apDevices);

  UdpEchoServerHelper echoServer (9);

  ApplicationContainer serverApps = echoServer.Install (csmaNodes.Get (nCsma));

  serverApps.Start (Seconds (1.0));

  serverApps.Stop (Seconds (10.0));

  UdpEchoClientHelper echoClient (csmaInterfaces.GetAddress (nCsma), 9);

  echoClient.SetAttribute ("MaxPackets", UintegerValue (1));

  echoClient.SetAttribute ("Interval", TimeValue (Seconds (1.0)));

  echoClient.SetAttribute ("PacketSize", UintegerValue (1024));

  ApplicationContainer clientApps = 

    echoClient.Install (wifiStaNodes.Get (nWifi - 1));

  clientApps.Start (Seconds (2.0));

  clientApps.Stop (Seconds (10.0));

  Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

///////////////////////////////////////////////////////////////////////The code below is completely same as the tutorial./////////////////////////////////

 std::ostringstream oss;

 oss<< "/NodeList/"

    << wifiStaNodes.Get(nWifi-1)->GetId()

    << "/$ns3::MobilityModel/CourseChange";

 std::cout<< "oss.str()" << std::endl<< std::endl;

 Config::Connect(oss.str(),MakeCallback(&CourseChange));

  

///////////////////////////////////////////////////////////////////////////////////////////

  Simulator::Stop (Seconds (10.0));

  if (tracing == true)

    {

      pointToPoint.EnablePcapAll ("third");

      phy.EnablePcap ("third", apDevices.Get (0));

      csma.EnablePcap ("third", csmaDevices.Get (0), true);

    }

  Simulator::Run ();

  Simulator::Destroy ();

  return 0;

}

*****************************************

And the result is below:

Waf: Entering directory `/home/wufan/works/ns-allinone-3.26/ns-3.26/build'

[ 927/2627] Compiling scratch/third.cc

[2615/2627] Linking build/scratch/third

Waf: Leaving directory `/home/wufan/works/ns-allinone-3.26/ns-3.26/build'

Build commands will be stored in build/compile_commands.json

'build' finished successfully (3.400s)

At time 2s client sent 1024 bytes to 10.1.2.4 port 9

At time 2.01796s server received 1024 bytes from 10.1.3.3 port 49153

At time 2.01796s server sent 1024 bytes to 10.1.3.3 port 49153

At time 2.03364s client received 1024 bytes from 10.1.2.4 port 9

All can see that no any trace result occurs.

2 For the Ptr pointer

Here I find the webpage 

https://groups.google.com/forum/#!searchin/ns-3-users/third.cc$20$20coursechange%7Csort:relevance/ns-3-users/WGheZMtoeIM/zvXJFblFi1gJ

But even if I use the improvement, there is no any result about the trace. The output is same as the above.

Please help me about the above problems. 

And I want to ask a question: Do I make wrong operations, or the tutorial is wrong? 

Thanks a lot.

[Tommaso Pecorella]

Hi,

make sure you didn't compile ns-3 with an optimized build option. In optimized builds all the output logs are suppressed.

T.