[ndnSIM] How to get the Interest information from each face?

[Chengyu Fan]

Hi~

Please forgive me if I missed something apparent.

I want to collect the information of how many Interests and what Interests
arrive on a node from different faces.
Unfortunately, I did not find an example that shows how to collect those
data.

I find a class ns3::ndn::NetDeviceFace that seems suit my requirements. And
I need to override RegisterProtocolHandler function.
Is it correct?

Or is there a Tracer class can collect the data for me?

Thanks,
Chengyu
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