# 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/outputs/mqtt
page-component-name: cloud-data-platform
page-version: master
page-component-version: master
page-component-title: Cloud
page-relative-src-path: connect/components/outputs/mqtt.adoc
page-edit-url: https://github.com/redpanda-data/cloud-docs/edit/main/modules/develop/pages/connect/components/outputs/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/outputs/mqtt.md -->

**Type:** Output ▼

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

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

Pushes messages to an MQTT broker.

#### Common

```yml
outputs:
  label: ""
  mqtt:
    urls: [] # No default (required)
    client_id: ""
    connect_timeout: 30s
    topic: "" # No default (required)
    qos: 1
    write_timeout: 3s
    retained: false
    max_in_flight: 64
```

#### Advanced

```yml
outputs:
  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: []
    topic: "" # No default (required)
    qos: 1
    write_timeout: 3s
    retained: false
    retained_interpolated: "" # No default (optional)
    max_in_flight: 64
```

The `topic` field can be dynamically set using function interpolations described [here](https://docs.redpanda.com/cloud-data-platform/develop/connect/configuration/interpolation/#bloblang-queries). When sending batched messages these interpolations are performed per message part.

## [](#performance)Performance

This output benefits from sending multiple messages in flight in parallel for improved performance. You can tune the max number of in flight messages (or message batches) with the field `max_in_flight`.

## [](#fields)Fields

### [](#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`

### [](#max_in_flight)`max_in_flight`

The maximum number of messages to have in flight at a given time. Increase this to improve throughput.

**Type**: `int`

**Default**: `64`

### [](#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 QoS value to set for each message. Has options 0, 1, 2.

**Type**: `int`

**Default**: `1`

### [](#retained)`retained`

Set message as retained on the topic.

**Type**: `bool`

**Default**: `false`

### [](#retained_interpolated)`retained_interpolated`

Override the value of `retained` with an interpolable value, this allows it to be dynamically set based on message contents. The value must resolve to either `true` or `false`. This field supports [interpolation functions](https://docs.redpanda.com/cloud-data-platform/develop/connect/configuration/interpolation/#bloblang-queries).

**Type**: `string`

### [](#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`

### [](#topic)`topic`

The topic to publish messages to. This field supports [interpolation functions](https://docs.redpanda.com/cloud-data-platform/develop/connect/configuration/interpolation/#bloblang-queries).

**Type**: `string`

### [](#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**: `""`

### [](#write_timeout)`write_timeout`

The maximum amount of time to wait to write data before the attempt is abandoned.

**Type**: `string`

**Default**: `3s`

```yaml
# Examples:
write_timeout: 1s

# ---

write_timeout: 500ms
```