[ndnSIM] How to get nonce value from the reply object?

[Prasertsak U.]

Dear Alex,

Thank you very much about your guide.

Regards,
Prasertsak U.


On Mon, Jul 29, 2013 at 5:40 AM, Alex Afanasyev <
alexander.afanasyev at ucla.edu> wrote:

> Hi!
>
> With Data packet you can really put anything inside as part of the
> content.  There are many ways to do that, but in NS-3 the preferred method
> is to use a custom header.  It can be something like this:
>
> class NonceHeader : public Header{public:
>   static TypeId GetTypeId (void)
>   {
>     static TypeId tid = TypeId ("ns3::NonceHeader")
>       .SetParent<Header> ()
>       ;
>     return tid;
>   }
>
>   NonceHeader ()
>     : m_nonce (0)
>   {
>   }
>
>   NonceHeader (uint32_t nonce)
>     : m_nonce (nonce
>   {
>   }
>
>   uint32_t
>   GetNonce () const
>   {
>     return m_length;
>   }
>
>   virtual TypeId
>   GetInstanceTypeId (void) const
>   {
>     return NonceHeader::GetTypeId ();
>   }
>
>   virtual void
>   Print (std::ostream &os) const
>   {
>     os << m_nonce;
>   }
>
>   virtual uint32_t
>   GetSerializedSize (void) const
>   {
>     return 4;
>   }
>
>   virtual void
>   Serialize (Buffer::Iterator start) const
>   {
>     start.WriteU32 (m_nonce);
>   }
>
>   virtual uint32_t
>   Deserialize (Buffer::Iterator start)
>   {
>     m_nonce = start.ReadU32 ();
>     return 4;
>   }
> private:
>   uint32_t m_nonce;};
> ...
> // in producervoidOnInterest (Ptr<const Interest> interest){
>   Ptr<Packet> content = Create<Packet> (m_virtualPayloadSize);
>   // or just Ptr<Packet> content = Create<Packet> ();  if you don't need data packet to carry virtual payload
>   NonceHeader hdr (intereset->GetNonce ());
>   content->AddHeader (hdr);
>
>   Ptr<ContentObject> data = Create<ContentObject> (content);
>
>   // the rest is standard from apps/ndn-producer.cc}
> // in consumervoidOnContentObject (Ptr<const ContentObject> data){
>   NonceHeader hdr;
>   data->GetPayload ()->PeekHeader (hdr);
>
>   uint32_t echoedNonce = hdr->GetNonce ();
>   // use it somehow}
>
> ---
> Alex
>
> PS
> My example uses API from version 0.5 of ndnSIM, which is a little bit
> different from the "old" one.
>
> On Jul 28, 2013, at 7:01 AM, Prasertsak U. <gniliamg at gmail.com> wrote:
>
> For now, I solve my problem already, which workaround by signature field
> of ContentObject.
>
> //  @Provider App.
> void OnInterest(...)
> {
>      ndn::ContentObjectHeader data;
>      ...
>      data.SetSignature(interest->GetNonce());
>      ...
> }
>
> // @Consumer App.
> void OnContentObject (...)
> {
>      ...
>       uint32_t reply_nonce = contentObject->GetSignature();
>      ...
> }
>
> Regards,
> Prasertsak U.
>
>
> On Sun, Jul 28, 2013 at 6:52 PM, Prasertsak U. <gniliamg at gmail.com> wrote:
>
>> Dear All,
>>
>> I'm trying to use nonce value from the reply step to map something in the
>> buffer.
>> Unfortunately, I'm not found the way to get nonce value from the reply
>> object in the method "*OnContentObject".* Anybody knows the way or some
>> hints for mapping between request packet and the reply packet.  (I mean any
>> headers or fields like a nonce of Interest packet)
>>
>> *Overview Diagram for mapping:*
>> (1) Create Interest Packet -----> (2) Keep sender nonce value -----> (3)
>> waiting for reply
>> (4) Receive Reply content -----> (*5)* Get nonce value from reply objects
>> * ------>
>> (6) mapping with the buffer in step-2 ----> etc.
>>
>>
>> Thank you.
>>
>> Regards,
>> Prasertsak U.
>>
>> Computing Department, Silpakorn University, Thailand.
>>
>>
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>
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