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mqtt input

Subscribe to topics on MQTT brokers.

# 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

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. The format should be scheme://host:port where scheme is one of tcp, ssl, or ws, host is the ip-address (or hostname) and port is the port on which the broker is accepting connections. If an item of the list contains commas it will be expanded into multiple URLs.

Type: array of string

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 Expanso Edge producers.

Type: string

OptionSummary
nanoidappend 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"

will​

Set last will message in case of Expanso Edge 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.

Secret

This field contains sensitive information. Use a secret reference rather than a literal value.

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.

Secret

This field contains sensitive information. Use a secret reference rather than a literal value.

Type: string
Default: ""

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: ""

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 of object
Default: []

tls.client_certs[].cert​

A plain text certificate to use.

Type: string
Default: ""

tls.client_certs[].key​

A plain text certificate key to use.

Secret

This field contains sensitive information. Use a secret reference rather than a literal value.

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.

Secret

This field contains sensitive information. Use a secret reference rather than a literal value.

Type: string
Default: ""

topics​

A list of topics to consume from.

Type: array of string

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