<blockquote>
<p>Yepp, that did the trick :-)</p>
</blockquote>
<p>luckily the samr21-xpro is too slow with just 4 byte buffer. Otherwise we'd never have found this.</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/pull/11634?email_source=notifications&email_token=ABE7WYH6PFOX3GCLVY5HUN3PY7AW3A5CNFSM4HTU3XKKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGODW7Y66A#issuecomment-499093368">view it on GitHub</a>, or <a href="https://github.com/notifications/unsubscribe-auth/ABE7WYHS6V7HJNUTN2L34HDPY7AW3ANCNFSM4HTU3XKA">mute the thread</a>.<img src="https://github.com/notifications/beacon/ABE7WYD75ECIABIIXVV7KXLPY7AW3A5CNFSM4HTU3XKKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGODW7Y66A.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/pull/11634?email_source=notifications\u0026email_token=ABE7WYH6PFOX3GCLVY5HUN3PY7AW3A5CNFSM4HTU3XKKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGODW7Y66A#issuecomment-499093368",
"url": "https://github.com/RIOT-OS/RIOT/pull/11634?email_source=notifications\u0026email_token=ABE7WYH6PFOX3GCLVY5HUN3PY7AW3A5CNFSM4HTU3XKKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGODW7Y66A#issuecomment-499093368",
"name": "View Pull Request"
},
"description": "View this Pull Request on GitHub",
"publisher": {
"@type": "Organization",
"name": "GitHub",
"url": "https://github.com"
}
}
]</script>