[riot-notifications] [RIOT-OS/RIOT] gnrc_ipv6: add sending DEBUG output (#10769)

Martine Lenders notifications at github.com
Tue Jan 15 13:24:20 CET 2019

The RIOT community cares a lot about code quality.
Therefore, before describing what your contribution is about, we would like
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### Contribution description
While debugging https://github.com/RIOT-OS/RIOT/pull/10524#issuecomment-454347963 I noticed that there is no equivalent debugging message to IPv6 packet reception in


This makes it hard to follow a packet through the debug messages, as addresses for a packet sent are never shown in the debug output in `gnrc_ipv6`. This adds a debug message just before the packet leaves the IPv6 module.

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- if it's a bug fix, describe the bug that it solves and how it is solved
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### Testing procedure
Compile `gnrc_networking` with `ENABLE_DEBUG=1` in `gnrc_ipv6.c`. Ping another node. You will see the new debug message in the output.
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### Issues/PRs references
Examples: Fixes #1234. See also #5678. Depends on PR #9876.

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-- Commit Summary --

  * gnrc_ipv6: add sending DEBUG output

-- File Changes --

    M sys/net/gnrc/network_layer/ipv6/gnrc_ipv6.c (8)

-- Patch Links --


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