ss="params">
    <tr><td class="paramdir">[in,out]</td><td class="paramname">client</td><td>The MQTT client. </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">topic_name</td><td>The name of the topic to subscribe to. </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">max_qos_level</td><td>The maximum QOS level with which the broker can send application messages for this topic.</td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd><code>MQT