# Setup tab

![Setup tab in MQTT Consumer](https://3411831820-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FAYwCj9fPr1B2pjC11IOQ%2Fuploads%2Fgit-blob-22d697a4745e18a2587a717ba9b159b4e4dd17ab%2FPDI_MQTT_consumer_step_setup_tab_new_client-ID_option.png?alt=media)

In the **Setup** tab, define the connections used for receiving messages, topics to which you want to subscribe, and the consumer group for the topics.

| Option                       | Description                                                                                                                                                                                                                                                           |
| ---------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Connection**               | Specify the address of the MQTT server to which this step will connect for sending or retrieving messages.                                                                                                                                                            |
| **Client ID**                | Specify a unique ID for the MQTT client. The MQTT server uses this Client ID to recognize each distinct client and that client's current state.                                                                                                                       |
| **Topics**                   | Specify the MQTT topic(s) to be subscribed to.                                                                                                                                                                                                                        |
| **Quality of Service (QoS)** | <p>Quality of Service (QoS) is a level of guarantee for message delivery. Select one of the following options.</p><ul><li>At most once (0), which is the default value</li><li>At least once (<strong>1</strong>)</li><li>Exactly once (<strong>2</strong>)</li></ul> |


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.pentaho.com/pdia-data-integration/9.3-data-integration/pdi-transformation-steps-reference-overview/mqtt-consumer/select-an-engine-mqtt-consumer/using-the-mqtt-consumer-step-on-the-pentaho-engine-cp/options-mqtt-consumer-reuse/setup-tab-mqtt-consumer-reuse.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.