[Nfd-dev] How to use the client control forwarding strategy

[Alex Afanasyev]

Hi Lei,

To use client-control strategy you will need two pieces:  enable local control feature on the face and use the corresponding NDNLP header to indicate where to forward.

To enable the feature, you can refer to  http://redmine.named-data.net/projects/nfd/wiki/FaceMgmt#Enable-a-LocalControlHeader-feature <http://redmine.named-data.net/projects/nfd/wiki/FaceMgmt#Enable-a-LocalControlHeader-feature>

With ndn-cxx, you can write something like this (or follow Junxiao's example)

  ndn::Face **face**;
  ndn::KeyChain keyChain;
  ndn::nfd::Controller controller(**face**, keyChain);

  controller.start<ndn::nfd::FaceEnableLocalControlCommand>(
    ControlParameters()
      .setLocalControlFeature(ndn::nfd::LOCAL_CONTROL_FEATURE_NEXT_HOP_FACE_ID),
    ... callback for success ...,
    ... callback for failure (e.g., permission denied) ...);

  ...

  ndn::Interest x("/hello/world");
  x.setTag(make_shared<lp::NextHopFaceIdTag>(m_faceId));
  **face**.expressInterest(x, ...);
  ...

---
Alex

> On Feb 8, 2016, at 5:19 PM, Junxiao Shi <shijunxiao at email.arizona.EDU> wrote:
> 
> Hi Liu
> 
> I've used client-control in one simple app.
> https://github.com/yoursunny/ndn6-tools/blob/7322ea378dbcdd0014b5217cb49da6283c3f9e94/remote-register-prefix.cpp#L92-L121 <https://github.com/yoursunny/ndn6-tools/blob/7322ea378dbcdd0014b5217cb49da6283c3f9e94/remote-register-prefix.cpp#L92-L121>
> (not intended as a tutorial)
> 
> Yours, Junxiao
> 
> On Feb 8, 2016 17:36, "Lei Liu" <bigcatlei at gmail.com <mailto:bigcatlei at gmail.com>> wrote:
> Hi,
> 
> Can anyone help to elaborate how to enable the client control forwarding strategy in NFD?
> 
> I understand that by using nfdc, we can set strategy to a name such as:
> 
> nfdc set-strategy ndn:/app1/video ndn:/localhost/nfd/strategy/client-control
> 
> Then, suppose we have an interest like /app1/video, how can we force it to be forwarded to a specific face? NFD developer guide mentioned a NextHopFaceId field in the interest message, but how to enable this feature and send an interest with a NextHopFaceId field?
> 
> Thanks,
> Best regards,
> 
> Lei
> 
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