mqtt

Type:

Available in: Cloud, Self-Managed

Subscribe to topics on MQTT brokers.

  • Common

  • Advanced

# Common config fields, showing default values
input:
  label: ""
  mqtt:
    urls: [] # No default (required)
    client_id: ""
    connect_timeout: 30s
    topics: [] # No default (required)
    auto_replay_nacks: true
# All config fields, showing default values
input:
  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

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.

Fields

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

# 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

# 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.

This field contains sensitive information. Review your cluster security before adding it to your configuration.

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

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.

This field contains sensitive information. Review your cluster security before adding it to your configuration.

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.

This field contains sensitive information. Review your cluster security before adding it to your configuration.

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.

This field contains sensitive information. Review your cluster security before adding it to your configuration.

Type: string

Default: ""

# Examples

password: foo

password: ${KEY_PASSWORD}

topics

A list of topics to consume from.

Type: array

qos

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

Type: int

Default: 1

clean_session

Set whether the connection is non-persistent.

Type: bool

Default: true

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