This driver provides an interface allowing you to monitor any variable in your Control4 system. Each instance of the driver can specify a single device driver in your project to monitor, giving you access for up to 30 variables on this device.
This configuration is used automatically by BMS Monitor, which stores changes in these variables within the driver, while providing an interactive interface on which to view this data, from any T3 / T4 touchscreen and also Control4 App running on iOS or Android.
Find out more about BMS Monitor here