<p><b>@kaspar030</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/11624#discussion_r290652111">sys/tsrb/tsrb.c</a>:</p>
<pre style='color:#555'>> @@ -32,7 +32,7 @@ static char _pop(tsrb_t *rb)
 int tsrb_get_one(tsrb_t *rb)
 {
     if (!tsrb_empty(rb)) {
-        return _pop(rb);
+        return (unsigned char)_pop(rb);
</pre>
<p><a class="user-mention" data-hovercard-type="user" data-hovercard-url="/hovercards?user_id=10532675" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/smlng">@smlng</a> are you fine with this fix for now, and we revisit the API later?</p>

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