[riot-notifications] [RIOT-OS/RIOT] net/sixlowpan: Fixed calculation of fragment size (#10995)

Marian Buschsieweke notifications at github.com
Tue Feb 12 09:54:09 CET 2019

### Contribution description

Fragment size calculation previously failed for devices that are able to transmit bigger layer 2 PDUs that 802.15.4 devices. This commit fixes the issue.

### Testing procedure

Try running `ping6 -s 512 <ADDR>` with https://github.com/RIOT-OS/RIOT/pull/10340. This will fail, as maximum fragment size calculation does not work. Rebase PR https://github.com/RIOT-OS/RIOT/pull/10340 against this PR and it will work.

### Issues/PRs references

Bug found when testing 6LoWPAN fragmentation with the `cc110x`, which has a maximum layer two DPU of 253 bytes, which is higher than the usual 127-x bytes of 802.15.4 transceivers.
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-- Commit Summary --

  * net/sixlowpan: Fixed calculation of fragment size

-- File Changes --

    M sys/net/gnrc/network_layer/sixlowpan/frag/gnrc_sixlowpan_frag.c (2)

-- Patch Links --


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