I was trying to investigate why sometimes plotting an FFT from a log is unable to see data, it seems to be for the following reasons.
INS_HNTCH_ENABLE,1 + INS_LOG_BAT_OPT,0 = no data
or if ESC telemetry is not supported.
INS_HNTCH_ENABLE,1 + INS_LOG_BAT_OPT,2 + INS_HNTCH_MODE,3 = no data
or LOG_BITMASK’s IMU_RAW bit has been checked