MQTT Pub Broker Module | Crosser Documention

MQTT Pub Broker DocumentationVersion: 2.0.6
Retrieved: 2025-10-09 15:16:05
MQTT PublisherThe module is used to publishmessages to MQTT clients subscribing to a mathcing topic in the Crosser MQTT broker. It will also be possible to call other flows that have a MQTT Subscriber module with a matching topic.
This module is designed to be at the end of a flow.
SettingsNote: additional settings will be added in the future to support things like QoS


Name
Requirements
Purpose
Default

Topic*
Length: 0-256
Topic for the MQTT message
""

Source Property
Length: 1-256
The property that contains the MQTT message to send
message

Retain*
bool
If true the message will be stored as the ```last known good value``` for the topic.
false

UseRetainInMessage
bool
If true the retain flag in the message will have higher priority than Retain on settings.
false

Message Format
Raw,JSON, XML
If an object is passed in this sets the text-format to use when sending the MQTT message
JSON

InputAll settings marked with a * can be passed in on the incoming message. So for example we can set the topic by passing in a message like this.
{topic:'foo/bar'}
Note that the value in settings has higher priority than the value in the message.
OutputThis module does not have any output. It will pass a null value to the next module(s)

Name	Requirements	Purpose	Default
Topic*	Length: 0-256	Topic for the MQTT message	""
Source Property	Length: 1-256	The property that contains the MQTT message to send	message
Retain*	bool	If true the message will be stored as the ```last known good value``` for the topic.	false
UseRetainInMessage	bool	If true the retain flag in the message will have higher priority than Retain on settings.	false
Message Format	Raw,JSON, XML	If an object is passed in this sets the text-format to use when sending the MQTT message	JSON

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