Message Queuing Telemetry Transport

Subscribe and publish to MQTT topics

Publish and subscribe messages from Message Queuing Telemetry Transport (MQTT) to client(s) without the device needing to continuously poll the server.

Blocks

MQTT Publish	Publish messages to MQTT broker on specified topic
MQTT Subscribe	Receive messages from MQTT broker for specified topic

Model Settings

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MQTT Properties

Encryption type	Connection type between MQTT client and MQTT broker (Since R2023b)
Broker	MQTT broker service provider (Since R2023b)
Broker Address	MQTT broker address to which MQTT client is connected
Port	Configure MQTT client to communicate with MQTT broker (Since R2023b)
CA Server certificate path	Specify location of server root certificate (Since R2023b)
Username	User name for the MQTT broker
Password	Password for MQTT broker
Client ID	Identifier (ID) for MQTT client
Configuration file path on target	Location of configuration file on the Raspberry Pi (Since R2026a)
Print diagnostic messages	Enable logging of diagnostic message (Since R2025a)

Topics

Publish MQTT Messages and Subscribe to Message Topics
Basics of the MQTT messaging protocol.
Model Configuration Raspberry Pi Blockset
This section describes about the model configuration parameters.

Related Information

MQTT Basics (ThingSpeak)
MQTT Essentials

Featured Examples

Publish and Subscribe to Messages on ThingSpeak Using MQTT Blocks on Raspberry Pi

Use Raspberry Pi® Blockset to publish a message to a topic from Raspberry Pi in the ThingSpeak™ MQTT broker. This example also shows how to subscribe to a topic and receive a message from the ThingSpeak MQTT broker to Raspberry Pi. For more information on MQTT protocol, see MQTT Basics (ThingSpeak) and Publish MQTT Messages and Subscribe to Message Topics. In this example, ThingSpeak is the MQTT broker and Raspberry Pi board is the MQTT client (publisher and subscriber).

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