Assign random OnOff-values to different OnOff-Applications in a for-loop

[stefanhe...@googlemail.com]

Hey everybody!

I have started to work with ns3 2 days ago and I am playing a little bit with NetAnim and the star-animation.cc example at the moment. The follwoing code is an excerpt from this example. My aim is to assign every node and its OnOff-Application radom values for their On- and Offtime, respectively. Or even different values. My idea was to use the index i for this task, but I have not found a way to do so.

 

  OnOffHelper onOffHelper ("ns3::TcpSocketFactory", Address ());
  onOffHelper.SetAttribute ("OnTime", StringValue ("ns3::ConstantRandomVariable[Constant=1]"));
  onOffHelper.SetAttribute ("OffTime", StringValue ("ns3::ConstantRandomVariable[Constant=0]"));

  ApplicationContainer spokeApps;

  for (uint32_t i = 0; i < star.SpokeCount (); ++i)
    {
      AddressValue remoteAddress;
      remoteAddress = AddressValue(InetSocketAddress (star.GetHubIpv4Address (i), port));

      onOffHelper.SetAttribute ("Remote", remoteAddress);
      spokeApps.Add (onOffHelper.Install (star.GetSpokeNode (i)));
    }

This one replacing the for-loop would work, but I think that there must be a better way. Especially using the loop.

  {
  onOffHelper.SetAttribute ("OnTime", StringValue ("ns3::ConstantRandomVariable[Constant=1]"));
  onOffHelper.SetAttribute ("OffTime", StringValue ("ns3::ConstantRandomVariable[Constant=2]"));

  AddressValue remoteAddress;
  remoteAddress = AddressValue(InetSocketAddress (star.GetHubIpv4Address (0), port));

  onOffHelper.SetAttribute ("Remote", remoteAddress);
  spokeApps.Add (onOffHelper.Install (star.GetSpokeNode (0)));
  }

  {
  onOffHelper.SetAttribute ("OnTime", StringValue ("ns3::ConstantRandomVariable[Constant=3]"));
  onOffHelper.SetAttribute ("OffTime", StringValue ("ns3::ConstantRandomVariable[Constant=4]"));

  AddressValue remoteAddress;
  remoteAddress = AddressValue(InetSocketAddress (star.GetHubIpv4Address (1), port));

  onOffHelper.SetAttribute ("Remote", remoteAddress);
  spokeApps.Add (onOffHelper.Install (star.GetSpokeNode (1)));
  }

  {
  onOffHelper.SetAttribute ("OnTime", StringValue ("ns3::ConstantRandomVariable[Constant=4]"));
  onOffHelper.SetAttribute ("OffTime", StringValue ("ns3::ConstantRandomVariable[Constant=5]"));

  AddressValue remoteAddress;
  remoteAddress = AddressValue(InetSocketAddress (star.GetHubIpv4Address (2), port));

  onOffHelper.SetAttribute ("Remote", remoteAddress);
  spokeApps.Add (onOffHelper.Install (star.GetSpokeNode (2)));
  }
 
Thanks for every help and greets!

[John Abraham]

Maybe something like below gives the attached picture

johnabra-mac:ns-3-dev johnabraham$ hg diff

diff -r 23373993f110 src/netanim/examples/star-animation.cc

--- a/src/netanim/examples/star-animation.cc Mon Dec 10 10:54:28 2012 -0800

+++ b/src/netanim/examples/star-animation.cc Sun Jan 20 22:01:56 2013 -0800

@@ -49,7 +49,7 @@

   Config::SetDefault ("ns3::OnOffApplication::PacketSize", UintegerValue (137));

 

   // ??? try and stick 15kb/s into the data rate

-  Config::SetDefault ("ns3::OnOffApplication::DataRate", StringValue ("14kb/s"));

+  Config::SetDefault ("ns3::OnOffApplication::DataRate", StringValue ("1400kb/s"));

 

   //

   // Default number of nodes in the star.  Overridable by command line argument.

@@ -69,7 +69,7 @@

 

   NS_LOG_INFO ("Build star topology.");

   PointToPointHelper pointToPoint;

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

+  pointToPoint.SetDeviceAttribute ("DataRate", StringValue ("3Mbps"));

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

   PointToPointStarHelper star (nSpokes, pointToPoint);

 

@@ -110,13 +110,17 @@

   // Create OnOff applications to send TCP to the hub, one on each spoke node.

   //

   OnOffHelper onOffHelper ("ns3::TcpSocketFactory", Address ());

-  onOffHelper.SetAttribute ("OnTime", StringValue ("ns3::ConstantRandomVariable[Constant=1]"));

-  onOffHelper.SetAttribute ("OffTime", StringValue ("ns3::ConstantRandomVariable[Constant=0]"));

 

   ApplicationContainer spokeApps;

 

   for (uint32_t i = 0; i < star.SpokeCount (); ++i)

     {

+      std::ostringstream oss1;

+      oss1 << "ns3::ConstantRandomVariable[Constant=" << (i+1)%2 << "]";

+      std::ostringstream oss2;

+      oss2 << "ns3::ConstantRandomVariable[Constant=" << i << "]";

+      onOffHelper.SetAttribute ("OnTime", StringValue (oss1.str ())); 

+      onOffHelper.SetAttribute ("OffTime", StringValue (oss2.str ())); 

       AddressValue remoteAddress;

       if (useIpv6 == 0)

         {

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