[Nfd-dev] NDNLPv2: create lp::packet and add content

[Adhy Satya]

Dear list members,

I wonder if you have a chance to look into this issue of the new field I
created in NDNLPv2. It seems that it's not being transferred to the end
host (maybe a wire encode problem?).


Thank you


On Fri, Jul 21, 2017 at 4:39 PM, Adhy Satya <adhysatya820 at gmail.com> wrote:

> Just an update:
> I was able to create a new field in the NDNLP packet.
>
> I changed the following files:
> "ndn-cxx/src/lp/fields.hpp"
>
>     typedef detail::FieldDecl<field_location_tags::Header,
>                                             uint64_t,
>                                             tlv::CustomTag> CustomTagField;
>     BOOST_CONCEPT_ASSERT((Field<CustomTagField>));
>
>     CustomTagField
>      > FieldSet;
>
>
> "ndn-cxx/src/lp/tags.hpp"
>
> typedef SimpleTag<uint64_t, 0x60000001> CustomTag;
>
>
> "ndn-cxx/src/lp/tlv.hpp"
>
> CustomTag= 901
>
> compiled with ./waf
>
> "NFD/daemon/face/generic-link-service.cpp"
>
> void
> GenericLinkService::encodeLocalFields(const ndn::TagHost& netPkt,
> lp::Packet& lpPacket)
> {
>   shared_ptr<lp::IncomingFaceIdTag> incomingFaceIdTag = netPkt.getTag<lp::
> IncomingFaceIdTag>();
>   if (incomingFaceIdTag != nullptr) {
>     lpPacket.add<lp::IncomingFaceIdField>(*incomingFaceIdTag);
>   }
>
>   shared_ptr<lp::CustomTag> customTag = netPkt.getTag<lp::CustomTag>();
>   if (customTag != nullptr) {
>     lpPacket.add<lp::CustomTagField>(*customTag);
>   }
> }
>
>
> compiled with ./waf
>
> "ndn-cxx/examples/consumer.cpp"
>
>     // Insert Packet Tag
>     interest.setTag(std::make_shared<lp::CustomTag>(54321));
>     std::cout << "Tag value: " << interest.getTag<lp::CustomTag>() <<
> std::endl;
>
>     m_face.expressInterest(interest,
>                            bind(&Consumer::onData, this,  _1, _2),
>                            bind(&Consumer::onTimeout, this, _1));
>
>
> and finally, on the producer app
> "ndn-cxx/examples/producer.cpp"
>
> onInterest(const InterestFilter& filter, const Interest& interest)
>   {
>     std::cout << "<< I: " << interest << std::endl;
>
>     // Read Packet Tag
>     std::shared_ptr<lp::CustomTag> tag = interest.getTag<lp::CustomTag>();
>     std::cerr << "Tag from Consumer: " << tag << std::endl;
>
>
> compiled with ./waf
> and ran the applications, but the tag doesn't arrive at the producer:
>
> << I: /example/testApp/randomData?ndn.MustBeFresh=1&ndn.
> InterestLifetime=1000&ndn.Nonce=1547038398
> Tag from Consumer: 0
>
>
>
> Is there anything missing?
>
>
> Thank you
>
>
> On Thu, Jul 20, 2017 at 10:54 PM, Adhy Satya <adhysatya820 at gmail.com>
> wrote:
>
>> Hi,
>>
>> Following the idea of exchanging information between the consumer and the
>> producer, what's the difference between creating a ndn::lp::Packet or
>> a ndn::TagHost? Which method should I use?
>>
>>
>> I saw older posts (this
>> <http://www.lists.cs.ucla.edu/pipermail/nfd-dev/2017-February/002260.html>,
>> and this
>> <http://www.lists.cs.ucla.edu/pipermail/nfd-dev/2016-February/001536.html>),
>> but this methods are for CachePolicy and NextHopFaceIdTag. I want to send a
>> string "Hello" (type Name actually).
>>
>> In line with what Ashlesh did, I added the following lines at Consumer (
>> https://github.com/named-data/ndn-cxx/blob/master/examples/
>> consumer.cpp#L42), but need help with the commented lines.
>>
>>     ndn::lp::Packet lpPacket;
>>     // add string ("Hello") to lpPacket
>>     // send lpPacket
>>
>> And then I'll need to read that packet in the producer.
>>
>>
>> Thanks again for your help.
>>
>>
>>
>
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