All commands to and from the watch follow a specific format, see DT78_COMMANDS.md
AB 00 xx FF yy ...
xx is the packet length starting with FF
yy is the command type as shown below
20 connection (watch)
23 reset watch
25 OTA update mode
28 firmware info
31 heart rate, blood pressure & oxygen
32 all health data
51 steps data
52 sleep data
53 drink water reminder
71 find watch
72 notifications
73 alarms
74 user details
75 sedentary
76 quiet hours
77 raise to wake
78 hourly measure
79 shake camera
7A
7B
7C 12 hour system
7D find phone
7E weather data
7F sleep time
85
87 connection response (watch)
88 future weather data (high/low)
8A
8B
91 battery
92 device type & firmware version
93 set time
95 watch face
96
99 music control
9B device settings in app
9C watchface text font & color settings
9D music control +
9E reminder setting (type[exercise 0x00, medicine 0x01, book 0x02, trip 0x03], enabled, time, interval)
9F overlook reminder (interval)
A0 enabled reminders (sed 0x01, drink 0x02, overlook 0x08, exercise 0x10, medicine 0x20, book 0x40, trip 0x80)
A1 disconnect from app
A2 contact name
A3 contact number
A5 contact size & sos contact id
A6
A7
A8 QR codes (contact & payment)
C9
E4 barometer & altitude data
FF