Flespi is a lot more than just a REST API for the parsed messages. We also support (and promote) communication with our platform via the MQTT protocol.
Now flespi panel is closely integrated with our handly MQTT Tiles (for dashboarding) and MQTT Board (for testing) tools and offers quick access to them straight from its interface.
Learn more on how to use these tools from the flespi panel and why it may be convenient:
https://flespi.com/blog/better-together-mqtt-tiles-integrated-into-the-flespi-panel
