mqtt

Pushes messages to an MQTT broker.

Common
Advanced

# Common config fields, showing default values
output:
  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 config fields, showing default values
output:
  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. When sending batched messages these interpolations are performed per message part.

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

`urls`

A list of URLs to connect to. If an item of the list contains commas it will be expanded into multiple URLs.

Type: array

# Examples

urls:
  - tcp://localhost:1883

`client_id`

An identifier for the client connection.

Type: string

Default: ""

`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

`connect_timeout`

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

Type: string

Default: "30s" Requires version 3.58.0 or newer

# Examples

connect_timeout: 1s

connect_timeout: 500ms

`will`

Set last will message in case of Redpanda Connect failure

Type: object

`will.enabled`

Whether to enable last will messages.

Type: bool

Default: false

`will.qos`

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

Type: int

Default: 0

`will.retained`

Set retained for last will message.

Type: bool

Default: false

`will.topic`

Set topic for last will message.

Type: string

Default: ""

`will.payload`

Set payload for last will message.

Type: string

Default: ""

`user`

A username to connect with.

Type: string

Default: ""

`password`

A password to connect with.

Type: string

Default: ""

`keepalive`

Max seconds of inactivity before a keepalive message is sent.

Type: int

Default: 30

`tls`

Custom TLS settings can be used to override system defaults.

Type: object

`tls.enabled`

Whether custom TLS settings are enabled.

Type: bool

Default: false

`tls.skip_cert_verify`

Whether to skip server side certificate verification.

Type: bool

Default: false

`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 Requires version 3.45.0 or newer

`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.

Type: string

Default: ""

# Examples

root_cas: |-
  -----BEGIN CERTIFICATE-----
  ...
  -----END CERTIFICATE-----

`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: ""

# Examples

root_cas_file: ./root_cas.pem

`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: array

Default: []

# Examples

client_certs:
  - cert: foo
    key: bar

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

`tls.client_certs[].cert`

A plain text certificate to use.

Type: string

Default: ""

`tls.client_certs[].key`

A plain text certificate key to use.

Type: string

Default: ""

`tls.client_certs[].cert_file`

The path of a certificate to use.

Type: string

Default: ""

`tls.client_certs[].key_file`

The path of a certificate key to use.

Type: string

Default: ""

`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.

Type: string

Default: ""

# Examples

password: foo

password: ${KEY_PASSWORD}

`topic`

The topic to publish messages to. This field supports interpolation functions.

Type: string

`qos`

The QoS value to set for each message. Has options 0, 1, 2.

Type: int

Default: 1

`write_timeout`

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

Type: string

Default: "3s" Requires version 3.58.0 or newer

# Examples

write_timeout: 1s

write_timeout: 500ms

`retained`

Set message as retained on the topic.

Type: bool

Default: false

`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.

Type: string

Requires version 3.59.0 or newer

`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