a> must be used instead.</p>

<p>Since DTLSv1_listen() operates entirely statelessly whilst processing incoming ClientHellos it is unable to process fragmented messages (since this would require the allocation of state). An implication of this is that DTLSv1_listen() <b>only</b> supports ClientHellos that fit inside a single datagram.</p>

<p>For SSL_stateless() if an entire ClientHello message cannot be read without the &quot;read&quot; BIO becoming empty then the SSL_stateless() call will fail. It is the 