<div dir="ltr">Hi Klaus,<div><br></div><div>I'm working on a wireless scenario (my apologies! I forgot to clarify this in my first email).</div><div>- Point 1 (<span style="font-size:12.8px">Send the Data to a different interface</span>): nodes will broadcast packets on the same interface (WiFi);</div><div>- Point 2 (<span style="font-size:12.8px">Delay the Data packet</span>): since wireless is broadcast in nature, all nodes in the communication range will listen to Interest/Data transmissions and will rebroadcast roughly at the same time. Delayed retransmissions help to avoid collisions in the wireless channel. This technique was used in the <a href="https://github.com/cawka/ndnSIM-nom-rapid-car2car/blob/master/extensions/ndn-fw-v2v.cc">NDN Car2Car</a> work (ndnSIM) and other works, but I think they all used simulators. In the Car2Car, the delay was performed in a customized face, not in the strategy.</div><div><br></div><div><br></div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Jul 14, 2017 at 11:19 AM, Klaus Schneider <span dir="ltr"><<a href="mailto:klaus@cs.arizona.edu" target="_blank">klaus@cs.arizona.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class=""><br>
<br>
On 07/13/2017 08:47 PM, Adhy Satya wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi Junxiao,<br>
<br>
Thank you for your answer. I missed that detail on the NFD developer guide (that the strategy controls only Interests packets).<br>
In my case, each data packet is associated with a unique Interest; therefore, by adopting an Interest digest the strategy should be able to control Data packets. <br>
</blockquote>
<br></span>
You can use the function beforeSatisfyInterest() that is called whenever a Data packet arrives. Thus you can perform certain actions (like storing RTT measurements) on each Data packet. You just cannot:<br>
<br>
1. Send the Data to a different interface. Or<br>
<br>
2. Delay the Data packet.<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Was this feature ever implemented? (it shows as 0% done in issue 3333 <<a href="https://redmine.named-data.net/issues/3333" rel="noreferrer" target="_blank">https://redmine.named-data.ne<wbr>t/issues/3333</a>>). Are there any sample implementations?<br>
</blockquote>
<br>
One could design the strategy so that beforeSatisfyInterest() is a mandatory step in the pipeline between "incoming Data" and "outgoing Data". This would extend the functionality and probably support what you want.<br>
<br>
However, the strategy was not designed that way (presumably) because nobody saw a use case.<br>
<br>
For (1): why would anyone want to send the Data to a different face? It would be dropped there as "unsolicited".<br>
<br>
For (2): why do you want to delay the Data inside the strategy? Maybe there's an easier solution for you like<br>
<br>
- delaying Data/Interests at consumer or producer. Or<br>
- delaying the Interests inside the strategy.<br>
<br>
<br>
Best regards,<br>
Klaus<br>
<br>
<br>
<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
<br>
Thanks<span class=""><br>
<br>
<br>
<br>
<br>
<br>
On Thu, Jul 13, 2017 at 4:45 PM, Junxiao Shi <<a href="mailto:shijunxiao@email.arizona.edu" target="_blank">shijunxiao@email.arizona.edu</a> <mailto:<a href="mailto:shijunxiao@email.arizona.edu" target="_blank">shijunxiao@email.arizo<wbr>na.edu</a>>> wrote:<br>
<br>
Hi Adhy<br>
<br>
The method to delay Interest forwarding is explained in this answer:<br>
<a href="http://www.lists.cs.ucla.edu/pipermail/ndnsim/2017-July/003952.html" rel="noreferrer" target="_blank">http://www.lists.cs.ucla.edu/p<wbr>ipermail/ndnsim/2017-July/0039<wbr>52.html</a><br>
<<a href="http://www.lists.cs.ucla.edu/pipermail/ndnsim/2017-July/003952.html" rel="noreferrer" target="_blank">http://www.lists.cs.ucla.edu/<wbr>pipermail/ndnsim/2017-July/003<wbr>952.html</a>><br>
Forwarding strategy does not have control over Data forwarding nor<br>
can it delay Data forwarding. The reason is explained in this<br>
answer:<br>
<a href="http://www.lists.cs.ucla.edu/pipermail/ndnsim/2017-July/003961.html" rel="noreferrer" target="_blank">http://www.lists.cs.ucla.edu/p<wbr>ipermail/ndnsim/2017-July/0039<wbr>61.html</a><br>
<<a href="http://www.lists.cs.ucla.edu/pipermail/ndnsim/2017-July/003961.html" rel="noreferrer" target="_blank">http://www.lists.cs.ucla.edu/<wbr>pipermail/ndnsim/2017-July/003<wbr>961.html</a>><br>
Also, you need to ensure your Interest name (including any “extra<br>
name components”) is a prefix of the Data name. Otherwise, Data does<br>
not satisfy Interest and will not be received by the consumer.<br>
<br>
Yours, Junxiao<br>
<br>
</span><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">
On Jul 13, 2017, at 11:43 AM, Adhy Satya <<a href="mailto:adhysatya820@gmail.com" target="_blank">adhysatya820@gmail.com</a><br></span><span class="">
<mailto:<a href="mailto:adhysatya820@gmail.com" target="_blank">adhysatya820@gmail.com</a><wbr>>> wrote:<br>
<br>
Hi,<br>
<br>
My consumer and producer applications send Interest and Data<br>
packets with extra name components. I wrote a custom forwarding<br>
strategy that reads this name components and forward packets with<br>
certain delay.<br>
<br>
I'm using NFD 0.5.0 and ndn-cxx 0.5.0. I'm unsure where to<br>
implement the timer. It seems that if I implement a timer to call<br>
"this->sendInterest()" it will block the forwarder for a certain<br>
amount of time.<br>
<br>
Can you assist me on this issue please?<br>
<br>
Thank you<br>
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