PM0237 datasheet(52/88 Pages) STMICROELECTRONICS

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Design an application using BlueNRG, BlueNRG-MS ACI APIs

PM0237

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DocID027104 Rev 2

3.3

Services and characteristic configuration

In order to add a service and related characteristics, a user application has to define the

specific profile to be addressed:

Standard profile defined by Bluetooth SIG organization. The user must follow the

profile specification and services, characteristic specification documents in order to

implement them by using the related defined Profile, Services & Characteristics 16 bits

UUID (refer to Bluetooth SIG web page: https://www.bluetooth.org/en-

us/specification/adopted-specifications).

Proprietary, non-standard profile. The user must define its own services and

characteristics. In this case, 128-bits UIDS are required and must be generated by

profile implementers (refer to UUID generator web page:

http://www.famkruithof.net/uuid/uuidgen)

A service can be added using the following command:

- aci_gatt_add_serv (Service_UUID_Type, Service_UUID_16, Service_Type,

Max_Attributes_Records, &ServHandle);

This command returns the pointer to the Service Handle (ServHandle ), which is used to

identify the service within the user application. A characteristic can be added to this service

using this command:

- aci_gatt_add_char (ServHandle, Char_UUID_Type, Char_UUID_16,

Char_Value_Length, Char_Properties, Security_Permissions, GATT_Evt_Mask,

Enc_Key_Size, Is_Variable, &CharHandle);

This command returns the pointer to the Characteristic Handle (Char_Handle), which is

used to identify the characteristic within the user application.

For a detailed description of the aci_gatt_add_serv() and aci_gatt_add_char() functions

parameters refer to the user manuals UM1755 and UM1865.

The following pseudocode example illustrates the steps to be followed for adding a service

and two associated characteristic on a proprietary, non-standard profile.

tBleStatus Add_Server_Services_Characteristics(void)

{

tBleStatus ret;

The following 128bits UUIDs have been generated from the random UUID

generator:

D973F2E0-B19E-11E2-9E96-0800200C9A66 --> Service 128bits UUID

D973F2E1-B19E-11E2-9E96-0800200C9A66 --> Characteristic_1 128bits UUID

D973F2E2-B19E-11E2-9E96-0800200C9A66 --> Characteristic_2 128bits UUID

/* Service 128bits UUID */

const uint8_t service_uuid[16] =

{0x66,0x9a,0x0c,0x20,0x00,0x08,0x96,0x9e,0xe2,0x11,0x9e,0xb1,0xe0,0xf2,0x7

3,0xd9};

/* Characteristic_1 128bits UUID */

const uint8_t charUuid_1[16] =

{0x66,0x9a,0x0c,0x20,0x00,0x08,0x96,0x9e,0xe2,0x11,0x9e,0xb1,0xe1,0xf2,0x7

3,0xd9};

/* Characteristic_2 128bits UUID */

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