About UUID_Services and UUID_CHARACTERISTICS

[Elliot.Chao]

Hi,I use 51822 to make a fitness device. one of the function is advertising current value(Steps,Heart rate,Distance,Calorie) to the phone over BLE. What the default service and characteristics I must add? Or I can add a customer service and characteristics by myself.

Anyway, how do I start?

The ble_app_hrs example can work well on my EVK board. Can I use BLE_UUID_HEART_RATE_SERVICE and BLE_UUID_HEART_RATE_MEASUREMENT_CHAR to do these things or I must create new one?

Thank you.

[Carles]

Hi there,

There's a certain set of profiles defined by the Bluetooth SIG. If you stick to those, then you have to use the UUIDs defined by it, which are all named BLE_UUID_*. If one (or a combination of several) Bluetooth SIG profile does not match the requirements of your application, you will have to create your custom one using Vendor Specific UUIDs.

The UUIDs and code you mention in your post refer to the standard Heart Rate Service, defined by the SIG and therefore already having its own set of assigned UUIDs.

For a full list of adopted SIG profiles check this page: www.bluetooth.org/.../adopted-specifications

Carles

[Elliot.Chao]

I add a customer profile and service, characteristics. I saw a unknown service and characteristic on my phone(refer to attached file.) Is that right? Can I sign a name for my service or characteristic?

[Carles]

Hi there,

Is that right? Can I sign a name for my service or characteristic?

That is right, since it's a custom profile and the generic app you are using on the phone does not know about it.

You can add a name to the service in 2 ways:

1. If you write your own Smartphone app, then you can detect your UUID and simply display the service name
2. If you want standard apps to see a displayable name, you can use the "Characteristic User Description Descriptor", which contains a human readable UTF-8 string. This won't be of much use for the standard app though, since it won't know what to do with the data you notify (it's a custom profile after all) but at least you'll be able to read a string.

Carles

[Juliane]

Hi,

' Can I sign a name for my service or characteristic?'

Do you solve the problem and how ?

[Elliot.Chao]

You can set name from phone when phone read customer UUID. You can't set name on device side.