How to get the number of hops through the packet

[Sun Yu]

Hello everyone。 I am a fresher about NS3. Now, I want to get the number of hops through the packet when distination node recieve packet. Next is my code that is modified from manet-routing-compare.cc(examples/routing/...)

  I find a function (uint_8 GetHopCount()const) but i don`t know how to use it .

uint32_t currentSequenceNumber;

void ReceivePacket1 (Ptr<Socket> socket)

{

  

  NS_LOG_UNCOND ("Received One packet!");

   Ptr<Packet> packet ; 

//

//  PacketHeader packeheader = GetHopCount();

   while(packet = socket->Recv())

    {

        SeqTsHeader seqTsx;

        packet->RemoveHeader (seqTsx);

         currentSequenceNumber = seqTsx.GetSeq ();

        

            bytesTotal += packet->GetSize ();

                  packetsReceived += 1;

        

            rcv = Simulator::Now().GetMilliSeconds();

            sqhd = seqTsx.GetTs().GetMilliSeconds(); 

            

            std::cout << "Seq No " << currentSequenceNumber << " Tx " << sqhd << "\n";//Just to check seq number and Tx time 

             delay = delay +  (rcv - sqhd); //delay calculation 

           std::cout << "delay" << ":" << rcv - sqhd <<"  " << rcv << std::endl;

        // std::cout << "DFDF" << ":" << Simulator::Now().GetMilliSeconds<< std::endl;

    }

             xx = rcv - senttime;    

               

        throughput = (bytesTotal * 8 * 1000) / (1024 * xx); //throughput calculation

 

}

  static void GenerateTraffic (Ptr<Socket> socket/* Ptr<Packet> p*/, 

                            uint32_t pktSize, 

                             uint32_t pktCount, 

                              Time pktInterval )

{

  if (pktCount > 0)

    {

        SeqTsHeader seqTs;

      seqTs.SetSeq (pktCount);

      Ptr<Packet> p = Create<Packet> (packetSize-(8+4)); // 8+4 : the size of the seqTs header

      p->AddHeader (seqTs);

      socket->Send (p);

      NS_LOG_UNCOND ("Sending "<< pktCount  << " packet! \n");

      if(pktCount == 25)

    {

        senttime = Simulator::Now().GetMilliSeconds();

        }     

    Simulator::Schedule (pktInterval, &GenerateTraffic, 

                           socket, pktSize,pktCount-1, pktInterval);

    }

        

    

  else

    {

      socket->Close ();

    }

}

I  use these code from other post is run ok.

[Tommaso Pecorella]

Hi,

GetHopCount is a function of PbbPacket - a rather "strange" kind of packet,  not really used in ns-3.

What you're looking for is the packet TTL, and you can read it through a tag.

Check the example examples/socket/socket-options-ipv4.cc 

T.