MQTT Subscribe Node

Web/MQTT

MQTT Subscribe

Subscribes to an MQTT topic and invokes a handler for each incoming message. Holds execution until the connection closes or timeout, then triggers on_close.

mqtt_subscribewebLong running

Inputs5

Outputs3

Security exposure4/10

Packageweb

Ratings

Scores range from 0 to 10. Higher values mean more impact, exposure, or operational weight.

SecurityAttack surface and exposure impact.

4/10Medium

PrivacyPotential sensitivity of processed data.

3/10High

PerformanceRuntime or resource pressure.

3/10High

GovernancePolicy, audit, or compliance impact.

5/10Medium

ReliabilityOperational stability considerations.

4/10Medium

CostExternal or compute cost impact.

1/10High

Input Pins

Execute

Execution

exec_in

Start subscribing

Session

Struct

session

MQTT session reference

Schema enforced

Topic

String

topic

The MQTT topic filter to subscribe to

QoS

String

qos

Quality of Service level for the subscription

Default AtMostOnce

AtMostOnceAtLeastOnceExactlyOnce

Timeout (s)

Integer

timeout_seconds

How long to listen before auto-closing (0 = indefinite)

Default 0

Output Pins

On Subscribed

Execution

on_subscribed

Fires after the subscription is established

On Close

Execution

on_close

Fires when the subscription ends (timeout, disconnect, or error)

Error

Execution

exec_error

Fires if the subscription fails

Node Info

Internal name: mqtt_subscribe
Category: Web/MQTT
Function references: Can reference functions