# mqtt

> For the complete documentation index, see [llms.txt](https://docs.redpanda.com/llms.txt). Component-specific: [cloud-data-platform-full.txt](https://docs.redpanda.com/cloud-data-platform-full.txt)

---
title: mqtt
latest-operator-version: v26.1.4
latest-console-tag: v3.7.3
latest-connect-version: 4.93.0
latest-redpanda-tag: v26.1.9
docname: connect/components/inputs/mqtt
page-component-name: cloud-data-platform
page-version: master
page-component-version: master
page-component-title: Cloud
page-relative-src-path: connect/components/inputs/mqtt.adoc
page-edit-url: https://github.com/redpanda-data/cloud-docs/edit/main/modules/develop/pages/connect/components/inputs/mqtt.adoc
page-git-created-date: "2024-11-07"
page-git-modified-date: "2026-05-26"
---

<!-- Source: https://docs.redpanda.com/cloud-data-platform/develop/connect/components/inputs/mqtt.md -->

**Type:** Input ▼

[Input](https://docs.redpanda.com/cloud-data-platform/develop/connect/components/inputs/mqtt/)[Output](https://docs.redpanda.com/cloud-data-platform/develop/connect/components/outputs/mqtt/)

**Available in:** Cloud, [Self-Managed](https://docs.redpanda.com/connect/components/inputs/mqtt/%20%22View%20the%20Self-Managed%20version%20of%20this%20component%22)

Subscribe to topics on MQTT brokers.

#### Common

```yml
inputs:
  label: ""
  mqtt:
    urls: [] # No default (required)
    client_id: ""
    connect_timeout: 30s
    topics: [] # No default (required)
    auto_replay_nacks: true
```

#### Advanced

```yml
inputs:
  label: ""
  mqtt:
    urls: [] # No default (required)
    client_id: ""
    dynamic_client_id_suffix: "" # No default (optional)
    connect_timeout: 30s
    will:
      enabled: false
      qos: 0
      retained: false
      topic: ""
      payload: ""
    user: ""
    password: ""
    keepalive: 30
    tls:
      enabled: false
      skip_cert_verify: false
      enable_renegotiation: false
      root_cas: ""
      root_cas_file: ""
      client_certs: []
    topics: [] # No default (required)
    qos: 1
    clean_session: true
    auto_replay_nacks: true
```

## [](#metadata)Metadata

This input adds the following metadata fields to each message:

-   mqtt\_duplicate

-   mqtt\_qos

-   mqtt\_retained

-   mqtt\_topic

-   mqtt\_message\_id


You can access these metadata fields using [function interpolation](https://docs.redpanda.com/cloud-data-platform/develop/connect/configuration/interpolation/#bloblang-queries).

## [](#fields)Fields

### [](#auto_replay_nacks)`auto_replay_nacks`

Whether messages that are rejected (nacked) at the output level should be automatically replayed indefinitely, eventually resulting in back pressure if the cause of the rejections is persistent. If set to `false` these messages will instead be deleted. Disabling auto replays can greatly improve memory efficiency of high throughput streams as the original shape of the data can be discarded immediately upon consumption and mutation.

**Type**: `bool`

**Default**: `true`

### [](#clean_session)`clean_session`

Set whether the connection is non-persistent.

**Type**: `bool`

**Default**: `true`

### [](#client_id)`client_id`

An identifier for the client connection.

**Type**: `string`

**Default**: `""`

### [](#connect_timeout)`connect_timeout`

The maximum amount of time to wait in order to establish a connection before the attempt is abandoned.

**Type**: `string`

**Default**: `30s`

```yaml
# Examples:
connect_timeout: 1s

# ---

connect_timeout: 500ms
```

### [](#dynamic_client_id_suffix)`dynamic_client_id_suffix`

Append a dynamically generated suffix to the specified `client_id` on each run of the pipeline. This can be useful when clustering Redpanda Connect producers.

**Type**: `string`

| Option | Summary |
| --- | --- |
| nanoid | append a nanoid of length 21 characters |

### [](#keepalive)`keepalive`

Max seconds of inactivity before a keepalive message is sent.

**Type**: `int`

**Default**: `30`

### [](#password)`password`

A password to connect with.

> ⚠️ **CAUTION**
>
> This field contains sensitive information that usually shouldn’t be added to a configuration directly. For more information, see [Manage Secrets](https://docs.redpanda.com/cloud-data-platform/develop/connect/configuration/secret-management/) before adding it to your configuration.

**Type**: `string`

**Default**: `""`

### [](#qos)`qos`

The level of delivery guarantee to enforce. Has options 0, 1, 2.

**Type**: `int`

**Default**: `1`

### [](#tls)`tls`

Custom TLS settings can be used to override system defaults.

**Type**: `object`

### [](#tls-client_certs)`tls.client_certs[]`

A list of client certificates to use. For each certificate either the fields `cert` and `key`, or `cert_file` and `key_file` should be specified, but not both.

**Type**: `object`

**Default**: `[]`

```yaml
# Examples:
client_certs:
  - cert: foo
    key: bar

# ---

client_certs:
  - cert_file: ./example.pem
    key_file: ./example.key
```

### [](#tls-client_certs-cert)`tls.client_certs[].cert`

A plain text certificate to use.

**Type**: `string`

**Default**: `""`

### [](#tls-client_certs-cert_file)`tls.client_certs[].cert_file`

The path of a certificate to use.

**Type**: `string`

**Default**: `""`

### [](#tls-client_certs-key)`tls.client_certs[].key`

A plain text certificate key to use.

> ⚠️ **CAUTION**
>
> This field contains sensitive information that usually shouldn’t be added to a configuration directly. For more information, see [Manage Secrets](https://docs.redpanda.com/cloud-data-platform/develop/connect/configuration/secret-management/) before adding it to your configuration.

**Type**: `string`

**Default**: `""`

### [](#tls-client_certs-key_file)`tls.client_certs[].key_file`

The path of a certificate key to use.

**Type**: `string`

**Default**: `""`

### [](#tls-client_certs-password)`tls.client_certs[].password`

A plain text password for when the private key is password encrypted in PKCS#1 or PKCS#8 format. The obsolete `pbeWithMD5AndDES-CBC` algorithm is not supported for the PKCS#8 format.

Because the obsolete pbeWithMD5AndDES-CBC algorithm does not authenticate the ciphertext, it is vulnerable to padding oracle attacks that can let an attacker recover the plaintext.

> ⚠️ **CAUTION**
>
> This field contains sensitive information that usually shouldn’t be added to a configuration directly. For more information, see [Manage Secrets](https://docs.redpanda.com/cloud-data-platform/develop/connect/configuration/secret-management/) before adding it to your configuration.

**Type**: `string`

**Default**: `""`

```yaml
# Examples:
password: foo

# ---

password: ${KEY_PASSWORD}
```

### [](#tls-enable_renegotiation)`tls.enable_renegotiation`

Whether to allow the remote server to repeatedly request renegotiation. Enable this option if you’re seeing the error message `local error: tls: no renegotiation`.

**Type**: `bool`

**Default**: `false`

### [](#tls-enabled)`tls.enabled`

Whether custom TLS settings are enabled.

**Type**: `bool`

**Default**: `false`

### [](#tls-root_cas)`tls.root_cas`

An optional root certificate authority to use. This is a string, representing a certificate chain from the parent trusted root certificate, to possible intermediate signing certificates, to the host certificate.

> ⚠️ **CAUTION**
>
> This field contains sensitive information that usually shouldn’t be added to a configuration directly. For more information, see [Manage Secrets](https://docs.redpanda.com/cloud-data-platform/develop/connect/configuration/secret-management/) before adding it to your configuration.

**Type**: `string`

**Default**: `""`

```yaml
# Examples:
root_cas: |-
  -----BEGIN CERTIFICATE-----
  ...
  -----END CERTIFICATE-----
```

### [](#tls-root_cas_file)`tls.root_cas_file`

An optional path of a root certificate authority file to use. This is a file, often with a .pem extension, containing a certificate chain from the parent trusted root certificate, to possible intermediate signing certificates, to the host certificate.

**Type**: `string`

**Default**: `""`

```yaml
# Examples:
root_cas_file: ./root_cas.pem
```

### [](#tls-skip_cert_verify)`tls.skip_cert_verify`

Whether to skip server side certificate verification.

**Type**: `bool`

**Default**: `false`

### [](#topics)`topics[]`

A list of topics to consume from.

**Type**: `array`

### [](#urls)`urls[]`

A list of URLs to connect to. Use the format `scheme://host:port`, where:

-   `scheme` is one of the following: `tcp`, `ssl`, `ws`

-   `host` is the IP address or hostname

-   `port` is the port on which the MQTT broker accepts connections


If an item in the list contains commas, it is expanded into multiple URLs.

**Type**: `array`

```yaml
# Examples:
urls:
  - "tcp://localhost:1883"
```

### [](#user)`user`

A username to connect with.

**Type**: `string`

**Default**: `""`

### [](#will)`will`

Set last will message in case of Redpanda Connect failure

**Type**: `object`

### [](#will-enabled)`will.enabled`

Whether to enable last will messages.

**Type**: `bool`

**Default**: `false`

### [](#will-payload)`will.payload`

Set payload for last will message.

**Type**: `string`

**Default**: `""`

### [](#will-qos)`will.qos`

Set QoS for last will message. Valid values are: 0, 1, 2.

**Type**: `int`

**Default**: `0`

### [](#will-retained)`will.retained`

Set retained for last will message.

**Type**: `bool`

**Default**: `false`

### [](#will-topic)`will.topic`

Set topic for last will message.

**Type**: `string`

**Default**: `""`