# Options tab

![Options tab in MQTT Consumer](https://3411831820-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FAYwCj9fPr1B2pjC11IOQ%2Fuploads%2Fgit-blob-196bbe11e321e208c2dde6d1828cf11a029de34b%2FPDITransStep_MQTTConsumer_OptionsTab.png?alt=media)

The **Options** tab includes the following MQTT-specific parameters:

| Parameter               | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| ----------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Keep Alive Interval** | Specify a maximum number of interval seconds that is permitted to elapse between the point at which the PDI client finishes transmitting one Control Packet and the point it starts sending the next.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| **Max Inflight**        | Specify a number for the maximum number of messages to have in process at any given time.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| **Connection Timeout**  | Specify the time, in seconds, to disconnect if a message is not received.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| **Clean Session**       | <p>Specify if the broker will store or purge messages for a session. Select one of the following.</p><ul><li><strong><code>True</code></strong></li></ul><p>When set to <code>True</code>, the broker will not store any information for the client. All information from a previous persistent session will be purged.</p><ul><li><strong><code>False</code></strong></li></ul><p>When set to <code>False</code>, the broker will store all subscriptions for the client. When the QoS (<strong>Quality of Service</strong>) parameter is set to either 1 or 2, all missed messages will be stored. For more information, see the <strong>Quality of Service</strong> parameter in the <a href="setup-tab-mqtt-consumer-reuse"><strong>Setup</strong></a> tab.</p> |
| **Storage Level**       | <p>Indicates if messages are stored in memory or on disk.</p><ul><li>The default (blank) is memory.</li><li>For disk, enter a valid path.</li></ul><p>This setting is used only on Kettle. It is not used on AEL Spark, which uses its own configuration.</p>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| **Server URIs**         | Specify the MQTT server’s universal resource identifier (URI).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| **MQTT Version**        | Specify the MQTT protocol version that this step is connecting to.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| **Automatic Reconnect** | <p>Enables the client to attempt an automatic re-connect to the server if it becomes disconnected. Select <code>True</code> or <code>False</code>:</p><ul><li><strong><code>True</code></strong></li></ul><p>Yes, attempt to reconnect to the server.</p><ul><li><strong><code>False</code></strong></li></ul><p>No, do not attempt to reconnect to the server.</p>                                                                                                                                                                                                                                                                                                                                                                                                 |