px4-firmware/msg/vehicle_air_data.msg

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uint64 timestamp # time since system start (microseconds)
uint64 timestamp_sample # the timestamp of the raw data (microseconds)
uint32 baro_device_id # unique device ID for the selected barometer
float32 baro_alt_meter # Altitude above MSL calculated from temperature compensated baro sensor data using an ISA corrected for sea level pressure SENS_BARO_QNH.
float32 baro_temp_celcius # Temperature in degrees Celsius
float32 baro_pressure_pa # Absolute pressure in Pascals
float32 rho # air density
uint8 calibration_count # Calibration changed counter. Monotonically increases whenever calibration changes.