MQTT broker

Topic-based publish/subscribe broker for devices (Mosquitto, EMQX, HiveMQ, cloud IoT cores).

Provider: default
Kind: Pub/Sub topic
Category: Messaging
Official docs: https://mqtt.org/mqtt-specification/

Properties · 3 set by this component

property	type	values	required	kind default	this component
delivery	enum	at-most-once \| at-least-once \| exactly-once	yes	—	▸ at-most-once
managed	boolean	—	no	false	inherited
ordering	enum	none \| per-key	no	none	▸ per-key
persistentSessions · component property	boolean	—	no	false	inherited
qos · component property	integer	—	no	0	inherited
replay	boolean	—	no	false	▸ false
topicPerEventType · advanced	boolean	—	no	true	inherited

Rules that apply · 1

Every rule whose selector covers this component's kind or its category. Whether a rule fires depends on the design: its properties, its edges and its groups.

Pub/Sub topic where replay is requirederror

pubsub-replay-required

The design declares that consumers must be able to replay history. A fan-out topic that does not retain messages cannot deliver that.

— all of these hold:
— the design requirement `messaging.replay` is true
— the node's `replay` is false

Use it in a design

nodes:
  - { id: "mqtt-broker", component: "mqtt-broker" }

Other Pub/Sub topic products · 12

EventBridgealibaba-eventbridgealibabacloudpubsub-topic Amazon EventBridgeaws-eventbridgeawspubsub-topic Amazon SNSsnsawspubsub-topic Azure Event Gridazure-event-gridazurepubsub-topic Azure Event Grid MQTT Brokerazure-event-grid-mqttazurepubsub-topic Eclipse Mosquittomosquittopubsub-topic NanoMQnanomqpubsub-topic Generic Pub/Sub topicpubsub-topicpubsub-topic Redis Pub/Subredis-pubsubpubsub-topic Eventarcgoogle-eventarcgcppubsub-topic Google Cloud Pub/Subgoogle-pubsubgcppubsub-topic OCI Eventsoci-eventsocipubsub-topic

Source

1# yaml-language-server: $schema=../../schema/component.schema.json
2# MQTT broker (Mosquitto, EMQX, HiveMQ, IoT Core): topic fan-out for devices. QoS 0 is the wire default,
3# so delivery is at-most-once until the client asks for QoS 1 or 2.
4schemaVersion: "1"
5type: "component"
6id: "mqtt-broker"
7kind: "pubsub-topic"
8provider: "default"
9docs: "https://mqtt.org/mqtt-specification/"
10defaults:
11  delivery: "at-most-once"
12  ordering: "per-key"
13  replay: false
14properties:
15  qos:
16    type: "integer"
17    default: 0
18  persistentSessions:
19    type: "boolean"
20    default: false

The same page as markdown, for an agent: /catalogue/components/mqtt-broker.md