[ndnSIM] Manually change face state

[Junxiao Shi]

Hi Γιαννης

NFD face state is a combination of transport state and LinkService state.
The former, transport state, reports the state of the underlying socket.
The latter, LinkService state, reports the state as perceived by
LinkService. This part is not yet implemented.
Face class would not set either transport state or LinkService state, but
only read from them and report the combined state. It currently only reads
and returns transport state because LinkService state isn't implemented.

When a link becomes so lossy that communication is no longer possible, the
LinkService is supposed to detect this situation (using Bidirectional
Forwarding Detection, for example) and report LinkService state as DOWN.
Since the socket is still connected, the transport state remains UP.

Yours, Junxiao

On Tue, Mar 7, 2017 at 18:29 Γιαννης Μανωλοπουλος <j.manolopoulos at gmail.com>
wrote:

I am trying to model link failure between a router and a particular
consumer. The consumer has issued an interest, but the link fails while
awaiting for the data packet. I tried using LinkControlHelper, but it only
sets the error rate of the channel to maximum and won't change consumer
application's face state to DOWN. So, when the data packet arrives at the
router, as far as the forwarder/strategy is concerned, it is forwarded
correctly to the consumer and the pit entry gets deleted eventually,
whereas I want to maintain it for the duration of InterestLifetime or at
least until the link is up again (for experimental purposes).

So I was wondering if there is a way to schedule for this particular face
to change its state to DOWN at a given time, and then change it back to UP
when the link is up again.
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