VehicleMagnetometer (UORB message)

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uint64 timestamp            # time since system start (microseconds)

uint64 timestamp_sample     # the timestamp of the raw data (microseconds)

uint32 device_id            # unique device ID for the selected magnetometer

float32[3] magnetometer_ga  # Magnetic field in the FRD body frame XYZ-axis in Gauss

uint8 calibration_count     # Calibration changed counter. Monotonically increases whenever calibration changes.