This container configures Eclipse Mosquitto as a MQTT message broker sensors can send their data to.
Per default the MQTT server is unauthenticated, allowing any client to connect to send data. It is recommended to use a username and password. To do this set the device variables MQTT_USER and MQTT_PASSWORD.
The Mosquitto is exposed to the outside via nginx. If you don't have any external clients/sensors it is recommended to remove the nginx configuration.
While exposed via nginx, you can use MQTT Explorer to connect to Mosquitto. This allows to debug and even plot the incoming sensor data.