[Mini-NDN] Sending NACKs by application

[Matteo Bertolino]

Updating:
I successfully sent a NACK by the application.
Ex.
log << "I have not the file requested. Ending..." << endl;
lp::Nack outNack(interest);
lp::NackReason nack_reason = lp::NackReason::NONE;
outNack.setReason(nack_reason);
myFace.put(outNack);

Now I will try to modify the Best-Route strategy properly in order to  
implement a
broadcast interest if the best-route receive a NACK.

I wrote my updating because I think that they can be useful for very  
beginner users like
me.
Meanwhile, If someone has some advices about how to implement the  
mechanism above and
under mentioned, is really appreciated.
matteo

Quoting Matteo Bertolino <Matteo.Bertolino at eurecom.fr>:

> Good morning NDN community.
> I'm having some problems on sending NACKs by application.
>
> Briefly, my purpose:  Suppose to have two producers and one consumer,
> in the middle a gateway. Both producers P1 and P2 announced the prefix
> /some/prefix.  The cost GW - P1 is 10, the cost GW - P2 is 50. Suppose
> that the consumer request the file /some/prefix/file1 and that, even
> if P1 announced /some/prefix, it has not the file. I would like to
> follow a "Best-route" strategy. In this way (I already tested), the
> Interest reach just P that does nothing and the timeout expires.
>
> I would continue to use the Best-Route strategy yet, but with the
> following modification: when P understand that he has not the file, it
> should send a NACK packet with the reason "NoFile" for example. Then,
> the modified best-route strategy, will flood the Interest packet on
> the remaining interfaces that announced the same prefix.
>
> However, the first step is: sending a NACK packet by my personal cpp
> application.
> I did not manage to do it because I do not find an example online (actually I
> understood nothing of this one
> https://github.com/yoursunny/ndn-cxx-ext/blob/master/tools/nack-example-producer.cpp ) and the documentation ( http://named-data.net/doc/ndn-ccl-api/details/network-nack.html ) explains just how to   
> react
> to
> NACKs.
>
> Any hints is really appreciated.
> Sincerely,
> Matteo
>
>
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