Arduino Client for MQTT

This library provides a client for doing simple publish/subscribe messaging with a server that supports MQTT

For more information about MQTT, visit MQTT.org.

Download

The latest version of the library can be downloaded from GitHub.

Documentation

The library comes with a number of example sketches. See File > Examples > PubSubClient within the Arduino application.

Full API Documentation is available.

Author

• Nick O’Leary - @knolleary

License

This library is released under the MIT License.

Change History

The complete change history is available on GitHub.

Latest version: 2.8 - released 2020-05-20

• Add setBufferSize() to override MQTT_MAX_PACKET_SIZE
• Add setKeepAlive() to override MQTT_KEEPALIVE
• Add setSocketTimeout() to overide MQTT_SOCKET_TIMEOUT
• Added check to prevent subscribe/unsubscribe to empty topics
• Declare wifi mode prior to connect in ESP example
• Use strnlen to avoid overruns
• Support pre-connected Client objects