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POns3 poisson traffic model
 

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    <p>I'm trying to learn ns3, and I'm trying to modify one of the examples by using the onofApplication to generate Vbr instead of Cbr, but the code is not working and I don't know why, can you help me please?</p> <pre><code>#include "ns3/core-module.h" #include "ns3/network-module.h" #include "ns3/csma-module.h" #include "ns3/internet-module.h" #include "ns3/point-to-point-module.h" #include "ns3/applications-module.h" #include "ns3/ipv4-global-routing-helper.h" #include "ns3/random-variable.h" #include "ns3/socket-factory.h" #include "ns3/udp-socket-factory.h" #include "ns3/on-off-helper.h" #include "ns3/nstime.h" using namespace ns3; NS_LOG_COMPONENT_DEFINE ("SecondScriptExample"); int main (int argc, char *argv[]) { bool verbose = true; uint32_t nCsma = 3; CommandLine cmd; cmd.AddValue ("nCsma", "Number of \"extra\" CSMA nodes/devices", nCsma); cmd.AddValue ("verbose", "Tell echo applications to log if true", verbose); cmd.Parse (argc,argv); if (verbose) { LogComponentEnable ("UdpEchoClientApplication", LOG_LEVEL_INFO); LogComponentEnable ("UdpEchoServerApplication", LOG_LEVEL_INFO); } nCsma = nCsma == 0 ? 1 : nCsma; NodeContainer p2pNodes; p2pNodes.Create (2); NodeContainer csmaNodes; csmaNodes.Add (p2pNodes.Get (1)); csmaNodes.Create (nCsma); PointToPointHelper pointToPoint; pointToPoint.SetDeviceAttribute ("DataRate", StringValue ("5Mbps")); pointToPoint.SetChannelAttribute ("Delay", StringValue ("2ms")); NetDeviceContainer p2pDevices; p2pDevices = pointToPoint.Install (p2pNodes); CsmaHelper csma; csma.SetChannelAttribute ("DataRate", StringValue ("100Mbps")); csma.SetChannelAttribute ("Delay", TimeValue (NanoSeconds (6560))); NetDeviceContainer csmaDevices; csmaDevices = csma.Install (csmaNodes); InternetStackHelper stack; stack.Install (p2pNodes.Get (0)); stack.Install (csmaNodes); 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); UdpEchoServerHelper echoServer (9); ApplicationContainer serverApps = echoServer.Install (csmaNodes.Get (nCsma)); serverApps.Start (Seconds (1.0)); serverApps.Stop (Seconds (10.0)); OnOffHelper onOffAP ("ns3::UdpSocketFactory", csmaInterfaces.GetAddress(nCsma)); onOffAP.SetAttribute("PacketSize", UintegerValue(1024)); onOffAP.SetAttribute("OffTime",RandomVariableValue(ExponentialVariable(0.01))); // the packet arrivalrate on AP side is 100 pkt/sec, so we set mean value as 1/100 onOffAP.SetAttribute("OnTime",RandomVariableValue(ConstantVariable(0.0001583))); // the constanttime for sending one packet onOffAP.SetAttribute("DataRate", StringValue ("54Mbps")); // 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 = onOffAP.Install (p2pNodes.Get (0)); clientApps.Start (Seconds (2.0)); clientApps.Stop (Seconds (10.0)); Ipv4GlobalRoutingHelper::PopulateRoutingTables (); pointToPoint.EnablePcapAll ("second"); csma.EnablePcap ("second", csmaDevices.Get (1), true); Simulator::Run (); Simulator::Destroy (); return 0; } </code></pre> <p>and I'm getting this error</p> <pre><code>msg="Invalid value for attribute set (OffTime) on ns3::OnOffApplication", file=../src/core/model/object-factory.cc, line=75 libc++abi.dylib: terminate called without an active exception </code></pre>
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    1. COWhich version of NS-3 are you using?
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    2. COI'm using NS3 version 3.16
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    3. COActually, i have tried to use an exponential variable for OffTime (NS3 3.13) and that worked well for me !
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