After 10 min of power on the drone, steady on the flor, I start to get all this errors…
17-Jan-20 6:27:57 PM : EKF2 IMU1 is using optical flow
17-Jan-20 6:27:57 PM : EKF2 IMU1 has stopped aiding
17-Jan-20 6:27:52 PM : EKF2 IMU1 is using optical flow
17-Jan-20 6:27:52 PM : EKF2 IMU1 has stopped aiding
17-Jan-20 6:27:49 PM : PreArm: EKF2 Roll/Pitch inconsistent by 113 deg
17-Jan-20 6:27:47 PM : EKF2 IMU1 is using optical flow
17-Jan-20 6:27:47 PM : EKF2 IMU1 has stopped aiding
17-Jan-20 6:27:42 PM : EKF2 IMU1 is using optical flow
17-Jan-20 6:27:42 PM : EKF2 IMU1 has stopped aiding
17-Jan-20 6:27:37 PM : EKF2 IMU1 is using optical flow
17-Jan-20 6:27:37 PM : EKF2 IMU1 has stopped aiding
17-Jan-20 6:27:32 PM : EKF2 IMU1 is using optical flow
17-Jan-20 6:27:32 PM : EKF2 IMU1 has stopped aiding
what does it mean?