<p><a class="user-mention" data-hovercard-type="user" data-hovercard-url="/hovercards?user_id=1301112" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/benpicco">@benpicco</a> Many thanks for fixing the problem. I also realized the problem when I was starting to investigate issue <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="494485346" data-permission-text="Issue title is private" data-url="https://github.com/RIOT-OS/RIOT/issues/12258" data-hovercard-type="issue" data-hovercard-url="/RIOT-OS/RIOT/issues/12258/hovercard" href="https://github.com/RIOT-OS/RIOT/issues/12258">#12258</a>. Unfortunatly, we haven't seen this warning since we always checked <code>esp_now</code> and <code>esp_wifi</code> network devices with the <code>examples/gnrc_networking</code> application which enables module <code>gnrc_ipv6</code> which in turn enables <code>gnrc_sixlowpan</code> by default.</p>

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