# Limitations to using the mqtt() destination

Using the `mqtt()` destination of AxoSyslog has the following limitations:

  * You can only use the `mqtt()` destination with AxoSyslog version 3.33 or higher.

  * You cannot use the `mqtt()` destination without installing the the `eclipse-paho-mqtt-c` library.

For more information about how you can download and install the `eclipse-paho-mqtt-c` library, see [Eclipse Paho](<https://www.eclipse.org/paho/index.php?page=clients/c/index.php>) on the Eclipse Foundation website.

  * The current implementation of the `mqtt()` destination supports versions 3.1 and 3.1.1 of the MQTT protocol.




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