Add guideline to chose the UUID of custom BLE services in docs.
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doc/ble.md
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doc/ble.md
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@ -15,6 +15,29 @@ If **CTS** is detected, it'll request the current time to the companion applicat
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![BLE connection sequence diagram](ble/connection_sequence.png "BLE connection sequence diagram")
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![BLE connection sequence diagram](ble/connection_sequence.png "BLE connection sequence diagram")
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## BLE UUIDs
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When possible, InfiniTime tries to implement BLE services defined by the BLE specification.
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When the service does not exist in the BLE specification, InfiniTime implement custom services. As all BLE services, custom services are identified by a UUID. Here is how to define the UUID of custom services in InfiniTime:
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```
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- Base UUID : xxxxxxxx-78fc-48fe-8e23-433b3a1942d0
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- Service UUID : SSSS0000-78fc-48fe-8e23-433b3a1942d0 where SSSS is the service ID
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- Characteristic UUID : SSSSCCCC-78fc-48fe-8e23-433b3a1942d0 where CCCC is the characteristic ID for the service SSSS and is different than 0
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```
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The following custom services are implemented in InfiniTime:
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- Since InfiniTime 0.8:
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```
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* Music Service : 00000000-78fc-48fe-8e23-433b3a1942d0
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```
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- Since InfiniTime 0.11:
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```
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* Navigation Service : 00010000-78fc-48fe-8e23-433b3a1942d0
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```
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## BLE services
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## BLE services
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[List of standard BLE services](https://www.bluetooth.com/specifications/gatt/services/)
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[List of standard BLE services](https://www.bluetooth.com/specifications/gatt/services/)
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