ekf_gps_drift (UORB message)

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uint64 timestamp        # time since system start (microseconds)
float32 hpos_drift_rate     # Horizontal position rate magnitude checked using EKF2_REQ_HDRIFT (m/s)
float32 vpos_drift_rate     # Vertical position rate magnitude checked using EKF2_REQ_VDRIFT (m/s)
float32 hspd            # Filtered horizontal velocity magnitude checked using EKF2_REQ_HDRIFT (m/s)

bool blocked            # true when drift calculation is blocked due to IMU movement check