While there is no commercial support available, MQTT FX has an active community of users and developers who contribute to the project, provide support, and share knowledge.
As MQTT FX is open-source software, there is no license key required to use it. You can download the software, install it, and use it freely. mqtt fx license key
MQTT FX is released under the Eclipse Public License (EPL) version 1.0, which is a widely-used open-source license. The EPL is a weak copyleft license, which allows users to freely use, modify, and distribute the software. While there is no commercial support available, MQTT