params">
    <tr><td class="paramdir">[out]</td><td class="paramname">client</td><td>The MQTT client. </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">sockfd</td><td>The socket file descriptor (or equivalent socket handle, e.g. BIO pointer for OpenSSL sockets) connected to the MQTT broker. </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">sendbuf</td><td>A buffer that will be used for sending messages to the broker. </td></tr>
    <tr><td class="paramdir">[in]</td>