[ndnSIM] Data from onData

[Puming Fang]

Hi Mark,

Thanks for the reply.

I am trying to write a customized application “VNDN".

void
VNDN::OnInterest(std::shared_ptr<const ndn::Interest> interest)
{
  ndn::App::OnInterest(interest);
  NS_LOG_INFO("VNDN node receives Interest, Interest = " << interest->getName());
}

// Callback that will be called when Data arrives
void
VNDN::OnData(std::shared_ptr<const ndn::Data> data)
{
  if (!m_active)
    return;

  ndn::App::OnData(data); // tracing inside
  
  NS_LOG_INFO("VNDN node receives Data, Data = " << data->getName());
 }

I run the following command: 
NS_LOG=ndn.Consumer:ndn.Producer:ndn.VNDN ./waf  —run=xxx

The VNDN::OnInterest is called upon the arrival of the Interest but VNDN::OnData is not called upon the arrival of the Data.

Thank you for your time and assistance.

Best,
Puming


> On Mar 29, 2023, at 1:27 AM, Sirapop Theeranantachai via ndnSIM <ndnsim at lists.cs.ucla.edu> wrote:
> 
> Hello,
> 
> What command did you run when you use ndnSIM. Consumers and producers in ndnSIM will print out logs only if "NS_LOG" variables are defined as ndn.Consumer and ndn.Producer respectively.
> 
> For example,
> ndn.Consumer contains "OnData", "SendPacket", and "OnTimeout".
> ndn.Producer contains "OnInterest".
> If you want ndnSIM to show the log of both "OnData" and "OnInterest", you may need to put prefix before the ./waf command such as:
> 
> NS_LOG=ndn.Consumer:ndn.Producer ./waf --run=xxx 
> 
> If the packet does not actually arrive, you will see OnTimeout instead, so I do believe the packets are arriving.
> 
> Hope this help!
> Mark 
> 
> Begin forwarded message:
> 
> From: Puming Fang via ndnSIM <ndnsim at lists.cs.ucla.edu <mailto:ndnsim at lists.cs.ucla.edu>>
> Subject: [ndnSIM] App::OnData(data) is not called when Data Arrives
> Date: March 27, 2023 at 11:11:32 AM PDT
> To: ndnsim at lists.cs.ucla.edu <mailto:ndnsim at lists.cs.ucla.edu>
> Reply-To: Puming Fang <pfang at umass.edu <mailto:pfang at umass.edu>>
> 
> Dear NDN team,
> 
> I am currently working with ndnsim and have a query regarding the handling of Interest and Data packets. While attempting to implement certain operations upon the arrival of these packets, I have noticed that while the "App::OnInterest(Interest)" function works as expected, the "App::OnData(Data)" function does not seem to be called when the Data packet arrives. My intention is to log some information upon the arrival of Data packets.
> 
> I can confirm that the Data packets are indeed arriving at the node and being forwarded correctly. Could you please advise me on what could be causing this issue?
> 
> Thank you for your time and assistance.
> 
> Best, Puming
> 
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