SensorMag (UORB message)

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uint64 timestamp          # time since system start (microseconds)
uint64 timestamp_sample

uint32 device_id          # unique device ID for the sensor that does not change between power cycles

float32 x                 # magnetic field in the FRD board frame X-axis in Gauss
float32 y                 # magnetic field in the FRD board frame Y-axis in Gauss
float32 z                 # magnetic field in the FRD board frame Z-axis in Gauss

float32 temperature       # temperature in degrees Celsius

uint32 error_count

uint8 ORB_QUEUE_LENGTH = 4