蓝牙 BLE GATT 剖析（一）

一.概述

The Generic Attribute Profile (GATT) defines a service framework using the Attribute Protocol. This framework defines proceduresand formats of services and their characteristics. The proceduresdefined include discovering, reading,writing, notifying and indicating characteristics, as well asconfiguring the broadcast of characteristics.

二.架构

三.ATT属性table

四.GATT profile层次

1.SERVICE DEFINITION

2.INCLUDE DEFINITION

3.CHARACTERISTIC DEFINITION

1）Characteristic Declaration

Characteristic Declaration

2）Characteristic Value Declaration

3）Characteristic Descriptor Declarations

①Characteristic Extended Properties

②Characteristic User Description

③Client Characteristic Configuration

④Server Characteristic Configuration

⑤Characteristic Presentation Format

⑥Characteristic Aggregate Format

4.SUMMARY OF GATTPROFILE ATTRIBUTE TYPES

五.GATT FEATURE REQUIREMENTS

There are 11 features defined in the GATT Profile:
1. Server Configuration
2. Primary Service Discovery
3. Relationship Discovery
4. Characteristic Discovery
5. Characteristic Descriptor Discovery
6. Reading a Characteristic Value
7. Writing a Characteristic Value
8. Notification of a Characteristic Value
9. Indication of a Characteristic Value
10.Reading a Characteristic Descriptor
11.Writing a Characteristic Descriptor

GATT PROCEDURE MAPPING TO ATT PROTOCOL OPCODES