t()</b> return 1 on success, 0 otherwise.</p>

<p>Return values from the TLSv1.2 and below server callback are interpreted as follows:</p>

<dl>

<dt id="pod0">0</dt>
<dd>

<p>PSK identity was not found. An &quot;unknown_psk_identity&quot; alert message will be sent and the connection setup fails.</p>

</dd>
<dt id="pod01">&gt;0</dt>
<dd>

<p>PSK identity was found and the server callback has provided the PSK successfully in parameter <b>psk</b>. Return value is the length of <b>psk</b> in bytes. It is an e