<p></p>
<h4>Description</h4>
<p>I'm not quite sure whether an issue is right for such problem. I've run into an issue with DTLS/tinydtls with my gcoap development where I'm relatively sure it's not related to gcoap or my DTLS implementation. At first I thought this got fixed by another problem I found in the <code>sock_dtls_send_aux()</code> function, but sadly no.</p>
<h4>Steps to reproduce the issue</h4>
<p>Only testable on my <a href="https://github.com/janosbrodbeck/RIOT/tree/gcoap/pr/dtls-dev">gcoap dtls-dev branch</a>. Contains some more printing/info at the moment.</p>
<ul>
<li>Flash my branch on two native instances</li>
</ul>
<h4>Expected results</h4>
<h4>Actual results</h4>
<h4>Versions</h4>


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