px4-firmware/msg/sensor_accel_fifo.msg

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uint64 timestamp # time since system start (microseconds)
uint64 timestamp_sample
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uint32 device_id # unique device ID for the sensor that does not change between power cycles
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float32 dt # delta time between samples (microseconds)
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float32 scale
uint8 samples # number of valid samples
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int16[32] x # acceleration in the FRD board frame X-axis in m/s^2
int16[32] y # acceleration in the FRD board frame Y-axis in m/s^2
int16[32] z # acceleration in the FRD board frame Z-axis in m/s^2
uint8 rotation # Direction the sensor faces (see Rotation enum)