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 a client, and can be indicated and notified by the server

属性协议允许一个设备扮演服务端的角色，其对端的设备扮演客户端的角色。服务端将属性及其关联的值暴露给客户端。客户端可以发现、读、写这些属性，服务端可以将这些属性设置为指示模式(主动将消息发送到客户端，需要客户端回应)或通知模式(主动将消息发送到客户端，不需要客户端回应)。

二.架构

三.ATT DATA FORMAT

四.PDU总结

1.PUD ID

 

2.PDU requst and reponse