Multiple identical services in GATT table

RE: Multiple identical services in GATT table

Artem Zemlyanukhin — Thu, 08 Oct 2015 13:40:03 GMT

Petter,

Thank you for fast response!

RE: Multiple identical services in GATT table

Petter Myhre — Thu, 08 Oct 2015 13:37:09 GMT

I believe the report reference descriptor only is used with HID, to bind different battery services to report IDs.

According to the battery service specification, the correct way to separate between several instances of the battery service is to use the characteristic presentation format descriptor.

RE: Multiple identical services in GATT table

Artem Zemlyanukhin — Thu, 08 Oct 2015 13:09:34 GMT

Hello Petter,

My device has 2 batteries. So I need two instances of Battery Service on my device. These services are identical. To distinguish them on client side I decided to use Report Reference Desriptor. Moreover, Nordic implementation of Battery Service has Report Reference for Battery Level characteristic.

In HID over GATT profile Report Reference Descriptors are also used to distinguish HID Reports.

However, in Battery Service Specification I found demand to use Characteristic Presentation Format for my purpose. Characteristic Presentation Format has useful fields Namespace and Description.

Coudl you help me please to choose what to use to distinguish 2 identical services: Characteristic Presentation Format (as in service specification) or Report Reference Desriptor (as in Nordic implementation)?

Tnak you!

Best regards, Artem

RE: Multiple identical services in GATT table

Petter Myhre — Mon, 28 Sep 2015 14:24:00 GMT

I'm not very familiar with Report Reference Descriptor. What are is your source for using it when having 2 services with equal UUIDs?