[riot-notifications] [RIOT-OS/RIOT] gnrc_sixlowpan_frag: allow send of multiple datagrams simultaneously (#11021)

Cenk Gündoğan notifications at github.com
Mon May 27 09:47:50 CEST 2019

cgundogan approved this pull request.

The code looks good, tested on the iotlab testbed using 2 nodes. The normal operation still works. I then compiled with `GNRC_SIXLOWPAN_MSG_FRAG_SIZE=2` and reduced the ping interval in order to get interleaving ping fragments.

With below configuration pinging works:
ping6 -c 100 -i 200 -s 1232 ...

With below configuration pinging does not work:
ping6 -c 100 -i 100 -s 1232 ...

I assume that with a payload of 1232 I trigger ~10 fragments with an average RTT of ~100ms.
While a pinging interval of 200ms yields almost 100% success, pinging with 100ms yields 0% success. I can't tell whether it's just because of a too small fragmentation buffer.

Nevertheless, the proposed change is sane and the default is to handle **1** datagram at a time anyways. ACK from my side.

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