Document Hey Bracelet Protocol

[blackspherefollower]

BLE Name: HEY! Bracelet
Service UUID: edfec62e-9910-0bac-5241-d8bda6932a2f

• Mode Characteristic UUID: 2d86686a-53dc-25b3-0c4a-f0e10c8dee22
  The app sets the mode to 01 on use, but that doesn't actually seem necessary
  Sending 02 causes power off, re-enabled by plugging the bracelet into a power source

• Squeeze Characteristic UUID: 2d86686a-53dc-25b3-0c4a-f0e10c8dee20
  Only works when subscribed to the sensor
  Sending 0x64 first seems to be required, afterwards any value works

• Touch Sensor Characteristic UUID: 2d86686a-53dc-25b3-0c4a-f0e10c8dee21
  Returns 2 bytes:

  • The first seems to be a running count of long touches (resets on power off)
  • The second seems to be the position of the touch: I've seen 01, 03, 05 and 07 (originally suspected bit mapped areas, but maybe not)

• Charge Status Characteristic UUID: 2d86686a-53dc-25b3-0c4a-f0e10c8dee23
  Always returns 00 for me