Syslog-ng 3.33: the MQTT destination
Version 3.33 of syslog-ng introduced an MQTT destination. It uses the paho-c client library to send log messages to an MQTT broker. The current implementation supports version 3.1 and 3.1.1 of the protocol over non-encrypted connections, but this is only a first step.
From this blog, you can learn how to configure and test the mqtt() destination in syslog-ng.
Read my blog at https://www.syslog-ng.com/community/b/blog/posts/syslog-ng-3-33-the-mqtt-destination