SHT15_READING_NOTHING
(data->state == SHT15_READING_NOTHING),
if (data->state != SHT15_READING_NOTHING) { /* I/O error occurred */
data->state = SHT15_READING_NOTHING;
if (data->state != SHT15_READING_NOTHING)
data->state = SHT15_READING_NOTHING;