[Ndn-interest] Replacing virtual payload into realtime file transmission

[Arif Hussain Magsi]

Dear all,

I am trying to replace and exchange a virtual payload to a real-time file in a simple ndnSIM scenario. Following is my code, where a consumer requests a CSV file and the producer responds with the required payload from the example directory. However, I faced an error in it. Can anyone help me in this connection, please?

Code:

/#include "ns3/core-module.h"
#include "ns3/network-module.h"
#include "ns3/point-to-point-module.h"
#include "ns3/ndnSIM-module.h"
#include <fstream>

namespace ns3 {

int
main(int argc, char* argv[])
{
  // setting default parameters for PointToPoint links and channels
  Config::SetDefault("ns3::PointToPointNetDevice::DataRate", StringValue("1Mbps"));
  Config::SetDefault("ns3::PointToPointChannel::Delay", StringValue("10ms"));
  Config::SetDefault("ns3::DropTailQueue<Packet>::MaxSize", StringValue("20p"));

  CommandLine cmd;
  cmd.Parse(argc, argv);

  // Creating nodes
  NodeContainer nodes;
  nodes.Create(3);

  // Connecting nodes using two links
  PointToPointHelper p2p;
  p2p.Install(nodes.Get(0), nodes.Get(1));
  p2p.Install(nodes.Get(1), nodes.Get(2));

  // Install NDN stack on all nodes
  ndn::StackHelper ndnHelper;
  ndnHelper.SetDefaultRoutes(true);
  ndnHelper.InstallAll();

  // Choosing forwarding strategy
  ndn::StrategyChoiceHelper::InstallAll("/prefix", "/localhost/nfd/strategy/multicast");

  // Installing applications

  // Consumer
  ndn::AppHelper consumerHelper("ns3::ndn::ConsumerCbr");
  // Consumer will request /reputation.csv
  consumerHelper.SetPrefix("/reputation.csv");
  consumerHelper.SetAttribute("Frequency", StringValue("10")); // 10 interests a second
  auto apps = consumerHelper.Install(nodes.Get(0)); // first node
  apps.Stop(Seconds(10.0)); // stop the consumer app at 10 seconds mark

  // Producer
  ndn::AppHelper producerHelper("ns3::ndn::Producer");
  // Producer will reply to requests for /reputation.csv
  producerHelper.SetPrefix("/reputation.csv");

  // Read reputation.csv from local storage
  std::ifstream inputFile("ndnSIM/ns-3/src/ndnSIM/examples/reputation.csv");
  std::string fileContent((std::istreambuf_iterator<char>(inputFile)),
                           std::istreambuf_iterator<char>());
  producerHelper.SetAttribute("Payload", StringValue(fileContent));

  producerHelper.Install(nodes.Get(2)); // last node

  Simulator::Stop(Seconds(20.0));

  Simulator::Run();
  Simulator::Destroy();

  return 0;
}

} // namespace ns3

int
main(int argc, char* argv[])
{
  return ns3::main(argc, argv);



BR,

Magsi, Arif Hussain
____________________
ahmagsi at sau.edu.pk
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Wechat. +86-15600225390
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