[riot-notifications] [RIOT-OS/RIOT] gnrc_netif: relax 6lo MTU assertion for 802.15.4g (#14172)

benpicco notifications at github.com
Fri May 29 16:03:31 CEST 2020

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### Contribution description

802.15.4g devices have a 2047 byte PDU.
So the assertion `netif->ipv6.mtu == IPV6_MIN_MTU` is too strict here.

This is only enforced on init, so changing the modulation at run-time did not catch this bug.

### Testing procedure

To test, use e.g. `at86rf215` with 


and flash `examples/gnrc_networking`.
On `master` the this leads to a failed `assert()`.

### Issues/PRs references

fixes #14164

You can view, comment on, or merge this pull request online at:


-- Commit Summary --

  * gnrc_netif: relax 6lo MTU assertion for 802.15.4g

-- File Changes --

    M sys/net/gnrc/netif/gnrc_netif.c (2)

-- Patch Links --


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