The Sleep_ token was published as if its value were hours. It is not: the
appliance's own app pairs a duration picker with the values it puts on the wire,
one to one, and the pairing is half hours.
0:00 0:30 1:00 1:30 2:00 2:30 3:00 4:00 5:00 ... 12:00
0 1 2 3 4 5 6 8 10 ... 24
So the entity capped at 12 hours actually set six, every value asked for was
halved on the appliance, and twelve hours -- the app's own maximum, stated in its
help text -- could not be reached at all. The reading is halved and the write
doubled, and the step drops to 0.5 because that is the resolution the picker
offers.
Half-hour steps are what the app offers below three hours; above that it offers
whole hours only, so a half hour up there is untested rather than known-bad. A
Number cannot change step part-way, and turning this into a Select of the app's
sixteen values would change the entity's domain on every unit that already has
one, so the step stays 0.5 throughout and the comment says why.
The descriptor's own comment used to admit the upper bound was a guess ("only 0
has been observed on hardware"). The guess of 12 was right; the unit it was
expressed in was not.
perseus177
93f45cb356