蓝牙BLE ATT剖析（一）

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蓝牙BLE ATT剖析（一）

一.概述 The attribute protocol allows a device referred to as the server to expose a set of attributes and their associated values to a peer device referred to as the client. These attributes exposed by the server can be discovered, read, and written by…

蓝牙BLE ATT剖析（二）-- PDU

一.Error Handling Error Response The Error Responseis used to state that a given request cannot be performed, and to provide the reason.Note: The Write Command does notgenerate an Error Response 二.MTU Exchange 1.Exchange MTU Request The Exchange MTU R…

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, notify…

蓝牙BLE 架构剖析

一.BLE架构概述: 二.各个层…

蓝牙 BLE GATT 剖析（二）-- GATT UUID and 举例

generic attribute profile (GATT)The Generic Attributes (GATT) define a hierarchical data structure that is exposed to connected Bluetooth LE devices. 一.UUID GATT Services GATT Attribute Types GATT Characteristic Descriptors GATT Characteristic Types…

蓝牙BLE： ATT协议层中属性(Attribute)

ATT(Attribute Protocol)属性层是GATT和GAP的基础,它定义了BLE协议栈上层的数据结构和组织方式. 属性(Attribute)概念是ATT层的核心,ATT层定义了属性的内容,规定了访问属性的方法和权限.以编程的眼光来看,属性是一个数据结构,它包括了数据类型和数据值,就如同C语言结构体的概念,开发者可以设计独特的结构,来描述外部世界实体. 属性包括三种类型:服务项.特征值和描述符.三者之间存在树状包含关系,服务项包含一个或多个特征值,特征值包含一个或多个描述符,多个服务项…