SensorBaro (UORB message) 
c
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 pressure          # static pressure measurement in Pascals
float32 temperature       # temperature in degrees Celsius
uint32 error_count
uint8 ORB_QUEUE_LENGTH = 4