<blockquote>
<p><code>gnrc_ipv6_router_default</code> didn't help. Then, I set the following in the both applications Makefiles (although I'm not completely sure what it does)</p>
<pre><code>CFLAGS += -DGNRC_IPV6_NIB_CONF_ARSM=1
CFLAGS += -DGNRC_IPV6_NIB_CONF_QUEUE_PKT=1
</code></pre>
<p>The assert disappeared and the handshake seemed successful. This is followed by some window mechanism and then, floods of TCP Keep-Alives.</p>
</blockquote>
<p>Since the tests currently use some custom mechanisms (automatic interaction between two distinct apps, custom addresses etc), I think it's alright to activate these.</p>

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