This is a getter function which returns the current Range from the front range sensor. The default unit of measurement is centimeters.
This function uses the front range sensor to measure distance from the drone to the surface in front of the drone.
get_front_range(unit="<cm, in, mm, m>")
unit: A string for the unit of measurement that is chosen for the range distance. Available units are "m" (meter), "cm" (centimeter), "mm" (millimeter), or "in" (inch). If a parameter is not specified "cm" is chosen by default.
The current range calculated by the front range sensor (cm by default).
-10 or 0 when the sensor returns an error value.
999 when the detected object is out of range (1.5 meters) or the sensor timed out.