[riot-notifications] [RIOT-OS/RIOT] gnrc_netif: allow for wait of minimum time between sends (#11837)

Martine Lenders notifications at github.com
Fri Jul 12 17:04:41 CEST 2019


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### Contribution description
This was cherry-picked out of #11068 (which became a huge mess during my experiment phase in preparation for [the 6LoWPAN fragment forwarding paper](https://arxiv.org/abs/1905.08089).

This adds a minimum sleep between every send, to allow for slowing down the send operations of  a device.

To be perfectly honest, I don't know if and how useful this could be in production operation or beyond experimentation in general, but I helped me to confirm some things during my experimentation. However, I kept it optional and marked it as experimental so I think it does not harm to merge.
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### Testing procedure
First compile and flash `gnrc_networking` normally with `GNRC_NETIF_MIN_WAIT_AFTER_SEND_US=0`. Ping another node with the same configuration. There should be no significant changes to to master.

Now compile with a higher delay e.g. `GNRC_NETIF_MIN_WAIT_AFTER_SEND_US=5000`. The RTT when pinging should now significantly increase (maybe even timeout), if you have access two a sniffer: the time different between two transmissions (ignoring L2 retransmissions) should now be at minimum at the configured time interval.
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### Issues/PRs references
Cherry-picked from #11068, but this PR has no dependencies.
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You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/11837

-- Commit Summary --

  * gnrc_netif: allow for wait of minimum time between sends

-- File Changes --

    M sys/include/net/gnrc/netif/conf.h (11)
    M sys/net/gnrc/netif/gnrc_netif.c (11)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/11837.patch
https://github.com/RIOT-OS/RIOT/pull/11837.diff

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