PM0237 datasheet(25/88 Pages) STMICROELECTRONICS

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PM0237

Bluetooth low energy technology

A service shall contain a service declaration and may contain definitions and characteristic

definitions. A service includes declaration follows the service declaration and any other

attributes of the server.

“Include service attribute handle” is the attribute handle of the included secondary service

and “end group handle” is the handle of the last attribute within the included secondary

service.

1.8.4

GATT procedures

The Generic Attribute Profile (GATT) defines a standard set of procedures allowing to

discover services, characteristics, related descriptors and how to use them.

The following procedures are available:

•

Discovery procedures (Table 16)

•

Client-initiated procedures (Table 17)

•

Server-initiated procedures (Table 18)

Table 15. Include declaration

Attribute

handle

Attribute type

Attribute value

Attribute

permissions

0xNNNN

0x2802 (UUID

for include

attribute type)

Include service

attribute

handle

End group

handle

Service

UUID

Read only,

No authentication,

No authorization

Table 16. Discovery procedures and related response events

Procedure

Response events

Discovery all primary services

Read by group response

Discovery primary service by service UUID

Find by type value response

Find included services

Read by type response event

Discovery all characteristics of a service

Read by type response

Discovery characteristics by UUID

Read by type response

Discovery all characteristics descriptors

Find information response

Table 17. Client-initiated procedures and related response events

Procedure

Response events

Read characteristic value

Read response event.

Read characteristic value by UUID

Read response event.

Read long characteristic value

Read blob response events

Read multiple characteristic values

Read response event.

Write characteristic value without response

No event is generated

Signed write without response

No event is generated

Write characteristic value

Write response event.

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