[ndnSIM] Missing HopCountTag in Data Packets

[Susmit]

Thanks a lot Alex!

I tested the code and can confirm it works properly.

On Wed, Feb 8, 2017 at 9:21 PM, Alex Afanasyev <aa at cs.ucla.edu> wrote:
> FYI.  Susmit sent me his code and after a bit of deep debugging, I discovered that this problem was actually caused by a small bug in ndnSIM.  I just pushed a fix to our code review system and it should be merged as soon as all sanity checks passed.
>
> --
> Alex
>
>> On Feb 8, 2017, at 11:59 AM, Susmit <susmit.shannigrahi at gmail.com> wrote:
>>
>> Hi All,
>>
>> I have an ndnSIM topology with one producer, multiple consumers and
>> intermediate nodes.  I am trying to get the hop count for incoming
>> data packets at the consumers.
>>
>> Below are the code and the trace for a single Interest packet.
>> I confirmed that I am getting data from a different node (node 64)
>> than the consumer (node 54), so the reply is not from local
>> cache/local producer.
>>
>> This is my code  for consumer::onData
>>
>> ________________________ Code  ______________________________________
>>
>>    void
>>    onData(const ndn::Interest& interest, const ndn::Data& data)
>>    {
>>        auto ID = ns3::Simulator::GetContext();
>>        auto now = ns3::Simulator::Now().To(ns3::Time::S);
>>
>>         int hopCount = 0;
>>         auto hopCountTag = data.getTag<ndn::lp::HopCountTag>();
>>         if (hopCountTag != nullptr) {
>>            hopCount = *hopCountTag;
>>            std::cout << "Hop count: " << *hopCountTag << std::endl;
>>          }
>>        else {
>>            std::cout << "Packet tag doesn't exist for " <<
>> data.getName() <<  std::endl;
>>        }
>>        std::cout << "Time: " << now << ",node:" << ID  <<  "
>> Consumer:onData"   << ",Data Name "  << data.getName() << ",Hop Count
>> " << hopCount << std::endl;
>>
>>        ..............
>>    }
>> __________________________ Trace ____________________________________
>>
>>
>>
>>
>> 1. Scheduling /cmip5/app/zg_Amon_EC-EARTH_rcp45_r6i1p1_200601-205012.nc/%00%00
>> at node 54 at time 1446227878 nonce 1495198176
>>
>> 2. Time: +1.44622787799999999995,node:54, Consumer:delayedInterest,
>> Interest Name /cmip5/app/zg_Amon_EC-EARTH_rcp45_r6i1p1_200601-205012.nc/%00%00
>>
>> 3. Time :+1.44635877299999999996 node:64, Producer::OnInterest,
>> Received interest:
>> /cmip5/app/zg_Amon_EC-EARTH_rcp45_r6i1p1_200601-205012.nc/%00%00 Nonce
>> : 1495198176
>>
>> 4. Packet tag doesn't exist for
>> /cmip5/app/zg_Amon_EC-EARTH_rcp45_r6i1p1_200601-205012.nc/%00%00/1495198176
>>
>> 5. Time: +1.57473100799999999997,node:54, Consumer:onData, Data Name
>> /cmip5/app/zg_Amon_EC-EARTH_rcp45_r6i1p1_200601-205012.nc/%00%00/1495198176,Hop
>> Count 0
>>
>>
>> I am not sure if I am missing something.
>>
>> Thanks for your help.
>>
>> --
>> Regards,
>> Susmit.
>> _______________________________________________
>> ndnSIM mailing list
>> ndnSIM at lists.cs.ucla.edu
>> http://www.lists.cs.ucla.edu/mailman/listinfo/ndnsim
>



-- 
Regards,
Susmit.