[riot-notifications] [RIOT-OS/RIOT] gnrc_rpl: do not assert netif on auto-init (#10895)

Martine Lenders notifications at github.com
Tue Jan 29 18:01:44 CET 2019



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### Contribution description
`gnrc_networking` is unusable when compiled for boards that do not have any network devices on-board due to an assertion in RPL's auto-init. I think this is pretty harsh. A friendly info message is enough, as it might not even be an error. Also, if one expects RPL to work without network interfaces they are a fool ;-). Also also, the `GNRC_NETIF_NUMOF != 1` case doesn't have this assertion either.
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### Testing procedure
Compile `gnrc_networking` for a board without any on-board radios. Without this PR the board will run into a failed assertion on start-up. With it, it will just continue and print a message before the normal welcome message: "Unable to auto-initialize RPL. No interfaces found."
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### Issues/PRs references
None, but discovered in #10412.
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You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/10895

-- Commit Summary --

  * gnrc_rpl: do not assert netif on auto-init

-- File Changes --

    M sys/net/gnrc/routing/rpl/gnrc_rpl_auto_init.c (6)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/10895.patch
https://github.com/RIOT-OS/RIOT/pull/10895.diff

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