mqtt

component_type_dropdown::[]

Pushes messages to an MQTT broker.

Introduced in version 4.37.0.

# 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
yml

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. 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
yml

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
yml

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 that usually shouldn’t be added to a configuration directly. For more information, see Secrets.

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.

This field contains sensitive information that usually shouldn’t be added to a configuration directly. For more information, see Secrets.

Type: string

Default: ""

# Examples

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

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
yml

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
yml

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 that usually shouldn’t be added to a configuration directly. For more information, see Secrets.

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 that usually shouldn’t be added to a configuration directly. For more information, see Secrets.

Type: string

Default: ""

# Examples

password: foo

password: ${KEY_PASSWORD}
yml

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
yml

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