[ndnSIM] Getting "Face" in PIT of node in simulator version 1.1 & Sending extra interest message

[Kanin Assantachai]

Dear everyone,

As in my another email, I have figured out the solutions to my own 
questions, so I would like to share how I implemented these features as 
well. Here they are!

1. Get the "Face" connected to neighbor nodes (implemented in 
ndn-forwarding-strategy.cc)
Reference: 
http://www.lists.cs.ucla.edu/pipermail/ndnsim/2013-March/000238.html

Ptr<Node> tempNode = inFace->GetNode ();
for (uint32_t deviceId = 0; deviceId < tempNode->GetNDevices (); 
deviceId ++)
       {
           Ptr<NetDevice> device = tempNode->GetDevice (deviceId);
           // get channel, to which device is connected (a "wire")
           Ptr<Channel> channel = device->GetChannel ();
           for (uint32_t channelDeviceId = 0; channelDeviceId < 
channel->GetNDevices (); channelDeviceId ++)
           {
               Ptr<NetDevice> channelDevice = channel->GetDevice 
(channelDeviceId);
               if (channelDevice == device){
tempNode->GetObject<ndn::L3Protocol>()->GetFaceByNetDevice(channelDevice); 
// modify this part on your own to keep this "Face"
                   continue;
                   // channelDevice is a "neighbor"
               }
           }
       }

2. Send extra interest message to another destination (implemented in 
ndn-forwarding-strategy.cc)

// Clear the list of outgoing face in the pitEntry first, add the 
outgoing face you want, then send the interest again
pitEntry->ClearOutgoing ();
pitEntry->AddOutgoing (<desired_outgoing_face>);
PropagateInterest (inFace, interest, pitEntry);

Again, hope this is helpful to the community.

Kanin Assantachai

On 19-May-15 12:21 AM, Kanin Assantachai wrote:
> Dear Spyridon / Alex,
>
> These are the follow-up questions to the email I sent a few days ago. 
> But since they are not quite related to the previous questions, I 
> would like to create another email for a separate series of archived 
> email.
>
> 1. I would like to print out the list of "Face" stored in the PIT of a 
> node. Even though it was asked before in this archived email: 
> http://www.lists.cs.ucla.edu/pipermail/ndnsim/2015-February/001693.html , 
> the suggested method only applies to the simulator version 2.0 since 
> it uses nfd library in the code. However as I am still working with 
> version 1.1 (I tried to upgrade to version 2.0 earlier, but the BRITE 
> integration component somehow does not compile with the new version), 
> may I ask for possible solutions to do this task in version 1.1?
>
> 2. I would like to make a node along the content retrieving path sends 
> another copy of the same interest message to its neighbor node instead 
> of the original intended destination. Please suggest some approaches 
> for this feature. For example, let's say there is Node "A" which is 
> connected to Node "B". Node B also connects to both Node C and Node D. 
> If I install a consumer app on node A, and producer apps on both node 
> C and D, how can I make node B sends extra copy of interest message to 
> node D when its original destination of the original interest is node 
> C? I have tried reading through the code of the functions SendPacket() 
> and ScheduleNextPacket() of ndn-consumer.cc, but I am not quite sure 
> if they are the correct place to modify the code.
>
> Thank you for your kind suggestions in advance.
>
> Sincerely,
>
> Kanin Assantachai
>