Metrics Service
Service UUID: 00001554-1212-efde-1523-785feabcd123
Characteristics
Section titled “Characteristics”| Name | UUID | Description | Read | Write | Notify | Indicate |
|---|---|---|---|---|---|---|
| UUID_CHARACTERISTIC_REGISTER_ID | 00001564-1212-efde-1523-785feabcd123 | Register a notification id for reading | Y | Y | N | N |
| UUID_CHARACTERISTIC_REGISTER | 0000155f-1212-efde-1523-785feabcd123 | Read last registered notification | Y | Y | N | N |
| UUID_CHARACTERISTIC_REGISTER_NOTIFIER | 0000155e-1212-efde-1523-785feabcd123 | Subscribe to all notifications | Y | N | Y | N |
Usecase
Section titled “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
Section titled “Known register & notification IDs”| Name | ID 0 | ID 1 | Data 2 | Data 3 | Data 4 | Data 5 | Data 6 | Data 7 | Data 8 | Data 9 |
|---|---|---|---|---|---|---|---|---|---|---|
| MOTION | 0x02 | 0x01 | WSPEED | WSPEED | 0x00 | 0x00 | 0x00 | 0x00 | 0x00 | 0x00 |
| TOTAL | 0x02 | 0x02 | 0x00 | 0x4E (1) | 0x00 | 0x00 | TOTAL | TOTAL | 0x00 | 0x00 |
| RIDE | 0x02 | 0x03 | Unknown (2) | CADENCE | Unknown | Unknown | Unknown | 0x00 | RANGE | 0x00 |
| SETTINGS | 0x03 | 0x00 | ASSIST | WALK | LIGHT | MODE | 0x00 | 0x00 | 0x00 | 0x00 |
| POWER | 0x04 | 0x01 | Unknown | 0x00 | 0x00 | CAMP | CAMP | 0x00 | 0x00 | 0x00 |
| MYSTERY | 0x00 | 0x00 | LIGHT | ASSIST | MODE | 0x00 | 0x00 | 0x00 | 0x00 | 0x00 |
- 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
Section titled “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.
| Name | ID 0 | ID 1 | Data 2 | Data 3 | Data 4 | Data 5 | Data 6 | Data 7 | Data 8 | Data 9 |
|---|---|---|---|---|---|---|---|---|---|---|
| Unknown | 0x00 | 0x01 | 0x00 | 0x00 | 0x00 | 0x00 | 0x00 | 0x00 | 0x00 | 0x00 |
| … | … | |||||||||
| Unknown | 0x00 | 0x06 | 0x00 | 0x00 | 0x00 | 0x00 | 0x00 | 0x00 | 0x00 | 0x00 |
Known writable IDs
Section titled “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:
| Name | ID 0 | ID 1 | Data 2 | Data 3 | Data 4 | Data 5 | Data 6 | Data 7 | Data 8 | Data 9 |
|---|---|---|---|---|---|---|---|---|---|---|
| SETTINGS WRITE | 0x00 | 0xD1 | LIGHT | ASSIST | MODE | ignored | ignored | ignored | ignored | ignored |
| Unknown | 0x00 | 0x13 | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown |
| Unknown | 0x00 | 0x26 | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown |
| Unknown | 0x00 | 0x3A | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown |
| Unknown | 0x00 | 0x4C | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown |
| Unknown | 0x00 | 0x5F | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown |
| Unknown | 0x00 | 0x73 | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown |
| Unknown | 0x00 | 0x86 | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown |
| Unknown | 0x00 | 0x99 | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown |
| Unknown | 0x00 | 0xAC | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown |
| Unknown | 0x00 | 0xBF | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown |
| Unknown | 0x00 | 0xE4 | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown |
| Unknown | 0x00 | 0xF7 | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown |