Metrics Service

Service UUID: 00001554-1212-efde-1523-785feabcd123

Characteristics

Usecase

The metrics service is used to retrieve data about the bike and be notified when the data changes.

Subscribe to ```UUID_CHARACTERISTIC_REGISTER_NOTIFIER``` to receive notifications when values change.

Write a 2-byte identifier to ```UUID_CHARACTERISTIC_REGISTER_ID``` and then read ```UUID_CHARACTERISTIC_REGISTER``` to get the data at any time.

Values can be changed by writing to ```UUID_CHARACTERISTIC_REGISTER```.

Known register & notification IDs

• WSPEED : UInt16, wheel speed (km/h) ~= ```WSPEED / 100```

• CADENCE : UInt8, pedal RPM ~=  ```5 * PSPEED```

• TOTAL : UInt16, total (km) ~= ```TOTAL / 10```

• ASSIST : pedal assist level (0-4)

• WALK : walk (push along) assist (0/90?)

• LIGHT : headlight on (1/0)

• MODE : riding power mode (0-7)

• RANGE : remaining range from battery in km

• CAMP : UInt16, charging current (A) ~= ```CAMP / 1000```

(1) Flickers between 0x4E and 0x4D when motor is running

 (2) Seems related to pedalling torque

Known register-only IDs

These were found by brute-force registering ids (0x00 0x00 to 0x09 0x09).

Only the following ones returned a corresponding register. 

Known writable IDs

New writable IDs were found brute-force writing ```UUID_CHARACTERISTIC_REGISTER``` with IDs (0x00 0x00 to 0x00 0xFF) and all data bytes at 0x00. Listed IDs produce a 3-0 notification when written: