Cameras
Images come back through the sharedgetImage() method, which every
GRID robot has, simulated or physical:
Lidar
front_lidar.
IMU
imu.
GPS
gps.
Barometer
barometer.
Magnetometer
magnetometer.
Distance sensor
front_range.
State
Pose and velocity come through the shared robot methods rather than a sensor:Sensor availability varies by vehicle — a ground robot has no barometer worth
reading. The full method list for each class is in the
AirGen robots reference.