A number of the config steps make the assumption they are running from
the sensors default power on state. If you do a soft reset of the
vehicle without killing power to the sensor this means the second time
you configure the sensor you will start from a state which didn't match
the base assumptions and can lead to the sensor preforming signficantly
differently then it was intended to. This issues a soft reset, and waits
for it to reboot before proceeding with configuration. If it's a
watchdog reset we don't want to spend long enough to have ensured the
sensor reset, so we say the sensor setup completely failed and don't use
it, as not using it will be less erroneous then using a misconfigured
sensor.
Michael du Breuil
Peter Barker
murata
Andrew Tridgell
Dmitri Ranfft
Nghia Nguyen