Notifications for Nokia Steel HR.
This app tried to extend notifications for the Nokia Steel HR to be received from any application and is now obsolete with latest firmware.
Poking around logs and Bluetooth protocol captures I was able to gather some information on device communication and BtLE services.
| Type | UUID | Description | ||
|---|---|---|---|---|
| Service | 00001800-0000-1000-8000-00805f9b34fb |
Generic access | ||
| Characteristic | 00002a00-0000-1000-8000-00805f9b34fb |
Device name | ||
| Characteristic | 00002a01-0000-1000-8000-00805f9b34fb |
Appearance | ||
| Characteristic | 00002a04-0000-1000-8000-00805f9b34fb |
Peripheral Preferred Connection Parameters | ||
| Service | 00001801-0000-1000-8000-00805f9b34fb |
Generic attribute | ||
| Characteristic | 00002a05-0000-1000-8000-00805f9b34fb |
Service Changed | ||
| Descriptor | 00002902-0000-1000-8000-00805f9b34fb |
Client Characteristic Configuration | ||
| Service | 00000020-5749-5448-0037-000000000000 |
Proprietary | ||
| Characteristic | 00000021-5749-5448-0037-000000000000 |
Proprietary | ||
| Descriptor | 00002902-0000-1000-8000-00805f9b34fb |
Client Characteristic Configuration | ||
| Characteristic | 00000022-5749-5448-0037-000000000000 |
Proprietary | ||
| Characteristic | 00000023-5749-5448-0037-000000000000 |
Proprietary | ||
| Descriptor | 00002902-0000-1000-8000-00805f9b34fb |
Client Characteristic Configuration | ||
| Characteristic | 00000024-5749-5448-0037-000000000000 |
Proprietary | ||
| Descriptor | 00002902-0000-1000-8000-00805f9b34fb |
Client Characteristic Configuration | ||
Judging by my observations, 00000023-5749-5448-0037-000000000000 is used for various kinds of
device setup and communication. Except for "get me device information" (which seems to return a
MAC address), all commands (e.g. "enable notifications", "tell me your current notification setup")
require authentication by the client using a challenge-response procedure with a secret that was
probably configured during initial device pairing and setup.
| Type | UUID | Description | ||
|---|---|---|---|---|
| Service | 00001811-0000-1000-8000-00805f9b34fb |
Alert Notification Service | ||
| Characteristic | 00002A46-0000-1000-8000-00805f9b34fb |
New Alert | ||
To send a notification to the device 00002A46-0000-1000-8000-00805f9b34fb has to be provided as a
GATT server by the app which the watch will connect to.