<p><a class="user-mention" data-hovercard-type="user" data-hovercard-url="/hovercards?user_id=22351514" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/mmaxus35">@mmaxus35</a> I could get your <code>tcp-simple-server</code> working with the changes described above (I will provide a PR). However, you must not mix GNRC and <code>lwIP</code> in you application. Either you use GNRC or you use <code>lwIP</code>. That is, you must not use <code>gnrc_*</code> modules in your makefile or <code>gnrc_*</code> functions in your application.</p>
<p>Your application works with the changes described and the following modules:</p>
<pre><code># module as used in tests/lwip 
USEMODULE += lwip lwip_ipv6_autoconfig lwip_sock_ip lwip_netdev
USEMODULE += lwip_tcp lwip_sock_tcp
USEMODULE += ipv6_addr
USEMODULE += shell
USEMODULE += shell_commands
USEMODULE += ps
USEMODULE += od
USEMODULE += netdev_default

# additional modules for the application
USEMODULE += netstats_l2
USEMODULE += netstats_ipv6
USEMODULE += netstats_rpl
USEMODULE += esp_wifi
</code></pre>
<p>I had a netcat running as TCP server on remote machine using with command <code>nc -6l 12345</code> and could receive the string <code>Hello!</code> from ESP32.</p>

<p style="font-size:small;-webkit-text-size-adjust:none;color:#666;">—<br />You are receiving this because you are subscribed to this thread.<br />Reply to this email directly, <a href="https://github.com/RIOT-OS/RIOT/issues/11910?email_source=notifications&email_token=ABE7WYFGUZSVA5SLWZM3PGTQBR4FVA5CNFSM4IGRWFR2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD26O3XA#issuecomment-515698140">view it on GitHub</a>, or <a href="https://github.com/notifications/unsubscribe-auth/ABE7WYEHAHKUSQSSUPQ5FKTQBR4FVANCNFSM4IGRWFRQ">mute the thread</a>.<img src="https://github.com/notifications/beacon/ABE7WYGI3I4GOFFXIEHTKMTQBR4FVA5CNFSM4IGRWFR2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD26O3XA.gif" height="1" width="1" alt="" /></p>
<script type="application/ld+json">[
{
"@context": "http://schema.org",
"@type": "EmailMessage",
"potentialAction": {
"@type": "ViewAction",
"target": "https://github.com/RIOT-OS/RIOT/issues/11910?email_source=notifications\u0026email_token=ABE7WYFGUZSVA5SLWZM3PGTQBR4FVA5CNFSM4IGRWFR2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD26O3XA#issuecomment-515698140",
"url": "https://github.com/RIOT-OS/RIOT/issues/11910?email_source=notifications\u0026email_token=ABE7WYFGUZSVA5SLWZM3PGTQBR4FVA5CNFSM4IGRWFR2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD26O3XA#issuecomment-515698140",
"name": "View Issue"
},
"description": "View this Issue on GitHub",
"publisher": {
"@type": "Organization",
"name": "GitHub",
"url": "https://github.com"
}
}
]</script>