[ndnSIM] Data forwarding backoff

[Muktadir R Chowdhury (mrchwdhr)]

Best way to do it would be to implement your forwarding mechanism as a forwarding strategy, by creating a new strategy class, instead of modifying the forwarder itself.

-Muktadir
________________________________
From: nabil khemache <khemache.nabil at gmail.com>
Sent: Monday, May 11, 2020 12:25 AM
To: ndnsim at lists.cs.ucla.edu <ndnsim at lists.cs.ucla.edu>; Muktadir R Chowdhury (mrchwdhr) <mrchwdhr at memphis.edu>
Subject: Data forwarding backoff

Hi Muktadir

I just found out that the problem came from the data refrence passed to onOutgoingData function. I think it was first created without make_shared.

I solved it while troubleshooting by creating in the funtion a new instance of data object and "cloned" from the passed one using the getters and setters of Signature and Metainfo.

I don't think this is the best way to operate. I might reach the data first call and make it shared, but this is all i have for the moment. Any other ideas would be great.

Thank you

Nabil

Le lun. 11 mai 2020 à 05:39, Muktadir R Chowdhury (mrchwdhr) <mrchwdhr at memphis.edu<mailto:mrchwdhr at memphis.edu>> a écrit :
Turn on the forwarder log of ndnSIM to see what's actually going on. If you can't find the problem, please share the log here. That will be helpful in debugging the problem.

-Muktadir
________________________________
From: ndnSIM <ndnsim-bounces at lists.cs.ucla.edu<mailto:ndnsim-bounces at lists.cs.ucla.edu>> on behalf of nabil khemache via ndnSIM <ndnsim at lists.cs.ucla.edu<mailto:ndnsim at lists.cs.ucla.edu>>
Sent: Sunday, May 10, 2020 11:35 AM
To: ndnsim at lists.cs.ucla.edu<mailto:ndnsim at lists.cs.ucla.edu> <ndnsim at lists.cs.ucla.edu<mailto:ndnsim at lists.cs.ucla.edu>>
Subject: [ndnSIM] Data forwarding backoff

Hi everyone,

i hope all of you are fine,

I'm trying one of the first forwarding mechanisms used in wireless networks: overhear and backoff forwarding


i used ns3::Simulator::Schedule to schedule the outface.sendInterest in the onOutgoingInterest function, and it works very well, i can see nodes keeping "silent".

But when i tried to use the same thing in the onOutgoingData with
ns3::Simulator::Schedule(ns3::MilliSeconds(rand()%2, &Face::sendData, &outFace, data)
i get a pointers related error "terminate called after throwing an instance of 'std::bad_weak_ptr'
  what():  bad_weak_ptr"

I don't have any idea which pointer is meant, and i'd be very pleased if anyone could give me a clue or another way to do it if i'm doing it wrong.

thanks in advance.

Best regards, Nabil


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