All control characteristics are under Service 00001523-1212-EFDE-1523-785FEABCD124
Mode = 00001524-1212-EFDE-1523-785FEABCD124
(READ, WRITE, NOTIFY)
Identify = 00008421-1212-EFDE-1523-785FEABCD124
(WRITE)
Power State = 00001525-1212-EFDE-1523-785FEABCD124
(WRITE, newer firmware also had READ and NOTIFY)