【Bluetooth-SIG】【CoreV6.2】【Vol3 Part G】【GATT】【零】【GATT 逐句逐段学习计划 2】

第 50 篇：Read Long Characteristic Value：长值读取

覆盖章节

4.8.3 Read Long Characteristic Value

学习重点

ATT_READ_BLOB_REQ
offset
MTU 限制
分段读取
长字符串、长证书、长配置数据场景

Mermaid 图

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第 51 篇：Read Multiple Characteristic Values：一次读多个值

覆盖章节

4.8.4 Read Multiple Characteristic Values

学习重点

多 handle 读取
返回值拼接
每个 value 长度需要预先可知
使用限制

第 52 篇：Read Multiple Variable Length Characteristic Values

覆盖章节

4.8.5 Read Multiple Variable Length Characteristic Values

学习重点

可变长度多值读取
与普通 Read Multiple 的区别
ATT_READ_MULTIPLE_VARIABLE_REQ / RSP
适合 variable length characteristic

阶段十：Characteristic Value Write

第 53 篇：Characteristic Value Write 总览

覆盖章节

4.9 Characteristic Value Write

学习重点

Write Without Response
Signed Write Without Response
Write Characteristic Value
Write Long Characteristic Value
Reliable Writes
写操作和属性权限

第 54 篇：Write Without Response：写了就跑，不等回信

覆盖章节

4.9.1 Write Without Response

学习重点

ATT_WRITE_CMD
无响应
速度快
不可靠确认
适合高频控制数据

Mermaid 图

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第 55 篇：Signed Write Without Response：带签名的无响应写

覆盖章节

4.9.2 Signed Write Without Response

学习重点

ATT_SIGNED_WRITE_CMD
Authentication Signature
适用限制
和安全管理器的关系

第 56 篇：Write Characteristic Value：标准写请求

覆盖章节

4.9.3 Write Characteristic Value

学习重点

ATT_WRITE_REQ
ATT_WRITE_RSP
有响应
写失败错误码
写配置、写控制命令常用

Mermaid 图

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第 57 篇：Write Long Characteristic Value：长值写入

覆盖章节

4.9.4 Write Long Characteristic Value

学习重点

Prepare Write
Execute Write
offset
分片缓存
最终提交

Mermaid 图

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第 58 篇：Characteristic Value Reliable Writes：可靠写

覆盖章节

4.9.5 Characteristic Value Reliable Writes

学习重点

Reliable Write 的目的
Prepare Write Response 校验
Execute Write 提交
写入前确认数据没有被篡改
和 Extended Properties 的关系

阶段十一：Notification 与 Indication

第 59 篇：Characteristic Value Notification 总览

覆盖章节

4.10 Characteristic Value Notification

学习重点

Notification 是 Server 主动发
不需要 Client confirmation
必须先配置 CCCD
适合传感器数据流

第 60 篇：Single Notification：单个通知流程

覆盖章节

4.10.1 Single Notification

学习重点

ATT_HANDLE_VALUE_NTF
无确认
可能丢失应用层感知不到
通知频率与连接参数关系

Mermaid 图

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第 61 篇：Multiple Variable Length Notifications

覆盖章节

4.10.2 Multiple Variable Length Notifications

学习重点

多个可变长度通知
ATT_MULTIPLE_HANDLE_VALUE_NTF
提升效率
支持条件和兼容性

第 62 篇：Characteristic Value Indication 总览

覆盖章节

4.11 Characteristic Value Indication
4.11.1 Indication

学习重点

Indication 需要 confirmation
ATT_HANDLE_VALUE_IND
ATT_HANDLE_VALUE_CFM
可靠但吞吐更低
适合关键状态变化

规范的 ATT Opcode 映射表中，Indication 对应 ATT_HANDLE_VALUE_IND 和 ATT_HANDLE_VALUE_CFM。

Mermaid 图

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阶段十二：Descriptor Read / Write

第 63 篇：Characteristic Descriptors 总览

覆盖章节

4.12 Characteristic Descriptors

学习重点

descriptor value 的读写过程
和 characteristic value 读写的相似点
CCCD 写入属于 descriptor write

第 64 篇：Read Characteristic Descriptor

覆盖章节

4.12.1 Read Characteristic Descriptor

学习重点

ATT_READ_REQ
descriptor handle
读取 CCCD / User Description / Presentation Format

第 65 篇：Read Long Characteristic Descriptor

覆盖章节

4.12.2 Read Long Characteristic Descriptor

学习重点

ATT_READ_BLOB_REQ
offset
长 descriptor 读取

第 66 篇：Write Characteristic Descriptor

覆盖章节

4.12.3 Write Characteristic Descriptor

学习重点

ATT_WRITE_REQ
写 CCCD
写 User Description
写失败常见原因

Mermaid 图

GATT Server GATT Client Application GATT Server GATT Client Application #mermaid-svg-pss34TEkruG9gmi2{font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-pss34TEkruG9gmi2 .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-pss34TEkruG9gmi2 .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-pss34TEkruG9gmi2 .error-icon{fill:#552222;}#mermaid-svg-pss34TEkruG9gmi2 .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-pss34TEkruG9gmi2 .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-pss34TEkruG9gmi2 .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-pss34TEkruG9gmi2 .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-pss34TEkruG9gmi2 .edge-thickness-invisible{stroke-width:0;fill:none;}#mermaid-svg-pss34TEkruG9gmi2 .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-pss34TEkruG9gmi2 .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-pss34TEkruG9gmi2 .marker{fill:#333333;stroke:#333333;}#mermaid-svg-pss34TEkruG9gmi2 .marker.cross{stroke:#333333;}#mermaid-svg-pss34TEkruG9gmi2 svg{font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-pss34TEkruG9gmi2 p{margin:0;}#mermaid-svg-pss34TEkruG9gmi2 .actor{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-pss34TEkruG9gmi2 text.actor>tspan{fill:black;stroke:none;}#mermaid-svg-pss34TEkruG9gmi2 .actor-line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);}#mermaid-svg-pss34TEkruG9gmi2 .innerArc{stroke-width:1.5;stroke-dasharray:none;}#mermaid-svg-pss34TEkruG9gmi2 .messageLine0{stroke-width:1.5;stroke-dasharray:none;stroke:#333;}#mermaid-svg-pss34TEkruG9gmi2 .messageLine1{stroke-width:1.5;stroke-dasharray:2,2;stroke:#333;}#mermaid-svg-pss34TEkruG9gmi2 #arrowhead path{fill:#333;stroke:#333;}#mermaid-svg-pss34TEkruG9gmi2 .sequenceNumber{fill:white;}#mermaid-svg-pss34TEkruG9gmi2 #sequencenumber{fill:#333;}#mermaid-svg-pss34TEkruG9gmi2 #crosshead path{fill:#333;stroke:#333;}#mermaid-svg-pss34TEkruG9gmi2 .messageText{fill:#333;stroke:none;}#mermaid-svg-pss34TEkruG9gmi2 .labelBox{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-pss34TEkruG9gmi2 .labelText,#mermaid-svg-pss34TEkruG9gmi2 .labelText>tspan{fill:black;stroke:none;}#mermaid-svg-pss34TEkruG9gmi2 .loopText,#mermaid-svg-pss34TEkruG9gmi2 .loopText>tspan{fill:black;stroke:none;}#mermaid-svg-pss34TEkruG9gmi2 .loopLine{stroke-width:2px;stroke-dasharray:2,2;stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);}#mermaid-svg-pss34TEkruG9gmi2 .note{stroke:#aaaa33;fill:#fff5ad;}#mermaid-svg-pss34TEkruG9gmi2 .noteText,#mermaid-svg-pss34TEkruG9gmi2 .noteText>tspan{fill:black;stroke:none;}#mermaid-svg-pss34TEkruG9gmi2 .activation0{fill:#f4f4f4;stroke:#666;}#mermaid-svg-pss34TEkruG9gmi2 .activation1{fill:#f4f4f4;stroke:#666;}#mermaid-svg-pss34TEkruG9gmi2 .activation2{fill:#f4f4f4;stroke:#666;}#mermaid-svg-pss34TEkruG9gmi2 .actorPopupMenu{position:absolute;}#mermaid-svg-pss34TEkruG9gmi2 .actorPopupMenuPanel{position:absolute;fill:#ECECFF;box-shadow:0px 8px 16px 0px rgba(0,0,0,0.2);filter:drop-shadow(3px 5px 2px rgb(0 0 0 / 0.4));}#mermaid-svg-pss34TEkruG9gmi2 .actor-man line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-pss34TEkruG9gmi2 .actor-man circle,#mermaid-svg-pss34TEkruG9gmi2 line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;stroke-width:2px;}#mermaid-svg-pss34TEkruG9gmi2 :root{--mermaid-font-family:"trebuchet ms",verdana,arial,sans-serif;} Enable NotificationWrite CCCD DescriptorWrite ResponseNotification

第 67 篇：Write Long Characteristic Descriptor

覆盖章节

4.12.4 Write Long Characteristic Descriptor

学习重点

Prepare Write
Execute Write
长 descriptor 写入
和 long characteristic value write 的对比

阶段十三：GATT Procedure 到 ATT Opcode 的映射

第 68 篇：GATT Procedure Mapping to ATT Protocol Opcodes

覆盖章节

4.13 GATT procedure mapping to ATT protocol opcodes

学习重点

GATT 是"过程语义"
ATT 是"实际发包"
每个 GATT procedure 对应哪些 ATT PDU
Wireshark 抓包时看到的是 ATT Opcode，不是"GATT_ReadMagic"

规范 Table 4.2 将 GATT procedure 映射到 ATT protocol opcodes，例如 Notification 对应 ATT_HANDLE_VALUE_NTF，Indication 对应 ATT_HANDLE_VALUE_IND / CFM，Long Write 和 Reliable Writes 对应 Prepare Write 与 Execute Write。

Mermaid 图

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ATT Opcode
L2CAP Packet
Controller
Air Interface
Read Characteristic Value
ATT_READ_REQ / RSP
Notification
ATT_HANDLE_VALUE_NTF
Indication
ATT_HANDLE_VALUE_IND / CFM

第 69 篇：Procedure Timeouts：GATT 超时以后为什么这个 Bearer 废了

覆盖章节

4.14 Procedure timeouts

学习重点

ATT transaction timeout
timeout 后 procedure failed
local higher layer 被通知
该 ATT bearer 上不能再执行 GATT procedure
只能换另一个 ATT bearer

规范说明，如果 ATT transaction timeout，则该 procedure 失败，并且该 ATT bearer 上不得再执行 GATT procedure；新的 GATT procedure 只能在另一个 ATT bearer 上执行。

Mermaid 图

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Yes
GATT Procedure Started
ATT transaction timeout?
Procedure completes
Procedure failed
Notify local higher layer
Stop further GATT procedures on this ATT bearer
Use another ATT bearer

阶段十四：L2CAP Interoperability Requirements

第 5 章解释 GATT 的"底盘"。GATT 自己不飞，它坐 L2CAP 的车。

第 70 篇：L2CAP Interoperability Requirements 总览

覆盖章节

5 L2CAP interoperability requirements

学习重点

default values
physical channel 差异
ATT over BR/EDR
ATT over LE
Enhanced ATT Bearer
Bearer support

第 71 篇：BR/EDR L2CAP Requirements：经典蓝牙上的 ATT Bearer

覆盖章节

5.1 BR/EDR L2CAP interoperability requirements
5.1.1 ATT_MTU
5.1.2 BR/EDR channel requirements
5.1.3 $This section is no longer used$

学习重点

BR/EDR 上的 Unenhanced ATT bearer
L2CAP connection-oriented channel
ATT fixed PSM
ATT_MTU 如何确定
BR/EDR 最小 ATT_MTU
channel 必须加密
5.1.3 是废弃章节

规范说明，BR/EDR 上 Unenhanced ATT bearer 使用 L2CAP connection-oriented channel，并通过 ATT fixed PSM 建立；ATT_MTU 在 L2CAP 配置阶段确定。

Mermaid 图

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ATT PDU
L2CAP Connection-Oriented Channel
BR/EDR Physical Link

第 72 篇：LE L2CAP Requirements：BLE 上的 ATT Fixed Channel

覆盖章节

5.2 LE L2CAP interoperability requirements
5.2.1 ATT_MTU
5.2.2 LE channel requirements

学习重点

LE Attribute L2CAP fixed channel
Fixed CID 0x0004
default ATT_MTU = 23
flushable data
reliable / best effort 区别

规范中 LE L2CAP ATT_MTU 表给出默认 ATT_MTU 为 23，并说明 LE Attribute Protocol 使用 fixed CID 0x0004。

Markdown 表格

项目	LE 默认值
ATT_MTU	23
L2CAP CID	0x0004

第 73 篇：Enhanced ATT Bearer：EATT 是怎么增强 ATT 的

覆盖章节

5.3 Enhanced ATT bearer L2CAP interoperability requirements
5.3.1 ATT_MTU
5.3.2 Channel Requirements

学习重点

EATT 是什么
Enhanced Credit Based Flow Control
多个 ATT bearer 并发
为什么 EATT 能改善阻塞问题
EATT 和普通 ATT 的区别

Mermaid 图

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ATT Bearer 1
EATT Bearer 2
EATT Bearer 3
Server

第 74 篇：L2CAP Collision Mitigation：碰撞如何缓解

覆盖章节

5.4 L2CAP collision mitigation

学习重点

collision 是什么
双方同时建链可能发生什么
L2CAP 层如何缓解
对实现的影响

第 75 篇：Bearer Support：一个设备到底要支持哪些 Bearer

覆盖章节

5.5 Bearer support

学习重点

Unenhanced ATT bearer
Enhanced ATT bearer
BR/EDR bearer
LE bearer
支持矩阵
兼容性策略

阶段十五：GAP Interoperability Requirements

GATT 负责"数据服务"，GAP 负责"我怎么找到你、连上你、断了怎么办"。一个像点菜系统，一个像餐厅门口迎宾。

第 76 篇：GAP Interoperability Requirements 总览

覆盖章节

6 GAP interoperability requirements

学习重点

GATT 与 GAP 的边界
连接建立由 GAP 处理
ATT bearer 建立依赖 GAP / L2CAP

第 77 篇：BR/EDR GAP Connection Establishment

覆盖章节

6.1 BR/EDR GAP interoperability requirements
6.1.1 Connection Establishment

学习重点

BR/EDR 下如何建立 Unenhanced ATT bearer
PSM = ATT
如何建立 Enhanced ATT bearer
何时需要确认 peer 支持 EATT
任意设备都可建立或终止 ATT bearer

规范说明，BR/EDR 上建立 Enhanced ATT bearer 前，需要知道对端支持 Enhanced ATT bearer，例如通过 Server Supported Features 或 SDP record。

第 78 篇：LE GAP Connection Establishment

覆盖章节

6.2 LE GAP interoperability requirements
6.2.1 Connection Establishment

学习重点

LE 下 Unenhanced ATT bearer 如何建立
LE 下 EATT 如何建立
ATT bearer 如何终止
LE 与 BR/EDR 的差异

规范说明，LE 上建立 Unenhanced ATT bearer 使用 GAP connection establishment procedure，Enhanced ATT bearer 使用 EATT fixed PSM。

第 79 篇：Profile Roles：GATT 可以跑在哪些 GAP 角色上

覆盖章节

6.2.2 Profile roles

学习重点

Central
Peripheral
GATT Client / Server 与 GAP Central / Peripheral 的关系
手机通常是 Central + GATT Client，但不是铁律

Mermaid 图

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不必然等于
GAP Role
Central
Peripheral
GATT Role
Client
Server

第 80 篇：Disconnected Events：断开后通知和指示怎么办

覆盖章节

6.3 Disconnected events
6.3.1 Notifications and indications while disconnected

学习重点

Client 配置了 notification / indication 后断开
Server 需要尝试重建连接
Client 是 Central 时主动建连
Client 是 Peripheral 时进入 connectable mode
Server 无法重连时丢弃事件

规范说明，如果 Server 因事件需要发送 notification 或 indication，但连接已断开，则应重新建立连接；如果无法重建连接，则丢弃该事件。

Mermaid 图

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No
Yes
No
Event triggers notification/indication
Connection exists?
Send Notification/Indication
Try to re-establish connection
Reconnect success?
Discard this event

阶段十六：Defined GATT Service

第 7 章讲的是 GATT 自己定义的服务。别看它名字像"系统自带小工具"，实际上缓存一致性、服务变化、EATT 支持都靠它撑场面。

第 81 篇：Defined GATT Service 总览

覆盖章节

7 Defined GATT service

学习重点

GATT Service 是 primary service
本章定义的 characteristics 都属于 <<GATT Service>>
GATT Service 的作用

规范说明，本节定义的所有 characteristics 都应包含在 UUID 为 <<GATT Service>> 的 primary service 中。

第 82 篇：Service Changed：服务表变了，快刷新缓存

覆盖章节

7.1 Service Changed

学习重点

Service Changed Characteristic
Indication
affected handle range
Client 缓存失效
为什么修改固件服务表后需要 Service Changed

Mermaid 图

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第 83 篇：Client Supported Features：Client 支持什么能力

覆盖章节

7.2 Client Supported Features

学习重点

Client Supported Features characteristic
Robust Caching 支持位
Multiple Handle Value Notifications 支持位
Client 主动告诉 Server 自己能力
和后续行为优化的关系

第 84 篇：Database Hash：数据库指纹

覆盖章节

7.3 Database Hash

学习重点

Database Hash 的目的
判断 GATT 数据库是否变化
Robust Caching 的核心工具
和 Service Changed 的关系

Mermaid 图

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Different
GATT Database
Database Hash
Client Cache
Compare Hash
Use Cache
Rediscover Database

第 85 篇：Database Hash Calculation：Hash 到底怎么算

覆盖章节

7.3.1 Database Hash calculation

学习重点

Database Hash 参与计算的内容
哪些 attribute 会影响 hash
顺序和 handle 的影响
Appendix B 的示例铺垫

第 86 篇：Server Supported Features：Server 支持 EATT 吗？

覆盖章节

7.4 Server Supported Features

学习重点

Server Supported Features characteristic
EATT Supported bit
Client 如何判断是否能建立 EATT
BR/EDR 下 EATT 检查的重要性

阶段十七：Security Considerations

第 87 篇：GATT Security 总览：属性不是你想读就能读

覆盖章节

8 Security considerations

学习重点

GATT 安全作用在 characteristic 级别
Authentication
Authorization
Encryption
每个 characteristic 可有不同安全要求

第 88 篇：Authentication Requirements：认证要求

覆盖章节

8.1 Authentication requirements

学习重点

认证如何影响读写
特征值之间可以有不同认证要求
一个 service 内也可能有不同强度要求
insufficient authentication 类错误

规范说明，每个 characteristic 可以有不同的安全属性，能读不代表能写，能写也不代表能读。

第 89 篇：Authorization Requirements：授权要求

覆盖章节

8.2 Authorization requirements

学习重点

authorization 独立应用到每个 characteristic
authorization 与 authentication 的区别
Insufficient Authorization 0x08
Server 如何拒绝未授权请求

规范说明，如果请求访问未授权的 characteristic，responder 应发送 ATT_ERROR_RSP，Error Code 为 Insufficient Authorization 0x08。

Mermaid 图

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Yes
No
Yes
Client Read/Write Request
Authenticated?
Return authentication-related error
Authorized?
ATT_ERROR_RSP

Insufficient Authorization 0x08
Allow Access

阶段十八：SDP Interoperability Requirements

第 90 篇：SDP Interoperability：BR/EDR 上如何发布 GATT 服务

覆盖章节

9 SDP interoperability requirements

学习重点

为什么 BR/EDR 下需要 SDP record
ATT only
EATT only
ATT + EATT
GATT Service Start Handle
GATT Service End Handle
PSM = ATT / EATT

规范说明，支持 GATT over BR/EDR 的设备需要根据 ATT/EATT 支持情况发布对应 SDP record；如果同时支持 ATT 和 EATT，则使用另一张 SDP record 表。

Mermaid 图

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Both ATT and EATT
BR/EDR Device supports GATT
Supports ATT/EATT?
Publish SDP Record Table 9.1
Publish SDP Record Table 9.2

第 91 篇：References：GATT 依赖了哪些外部规范

覆盖章节

10 References

学习重点

Assigned Numbers
RFC-4493
Core Specification Supplement
为什么 Database Hash 会引用密码学算法
为什么 UUID 要看 Assigned Numbers

阶段十九：Appendix 实战数据库

第 92 篇：Appendix A Example ATT Server Contents：从示例数据库看 GATT 全貌

覆盖章节

Appendix A Example ATT Server contents

学习重点

示例 ATT Server 数据库
Handle 排列
GAP Service
GATT Service
Battery State Service
Include
Characteristic Declaration
Characteristic Value
Descriptor
用 Markdown 表格完整转换 Appendix A

规范 Appendix A 给出了一个 ATT Server 示例，包括 GAP Service、GATT Service、Battery State Service、Thermometer Humidity Service、Manufacturer Service 等 attribute。

Mermaid 图

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GAP Service
GATT Service
Battery State Service
Thermometer Humidity Service
Included Manufacturer Service

第 93 篇：Appendix A 逐行拆解：Handle、Type、Value 如何组成数据库

覆盖章节

Appendix A Example ATT Server contents

学习重点

每一行 attribute 的含义
Primary Service 行
Characteristic Declaration 行
Characteristic Value 行
Include 行
Descriptor 行
从 handle 范围推导 service 边界

输出内容

把 Appendix A 表格逐行转换为 Markdown
每行添加解释列
用颜色概念解释不同 attribute 类型，但 Markdown 中用分类列实现

Markdown 表格模板

Handle	Attribute Type	Attribute Value	分类	解释
0x0001	<<Primary Service>>	<<GAP Service>>	Service	声明 GAP 服务起点
0x0004	<<Characteristic>>	{...}	Characteristic Declaration	声明某个特征值
0x0006	<<Device Name>>	"Example Device"	Characteristic Value	真实设备名

第 94 篇：Appendix B Example Database Hash：用例子理解数据库 Hash

覆盖章节

Appendix B Example Database Hash

学习重点

Appendix B 示例如何计算 Database Hash
输入数据如何组织
Hash 结果如何验证
和 Robust Caching 的闭环

Mermaid 图

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Select hash-relevant attributes
Concatenate fields in defined order
Run hash algorithm
Database Hash Characteristic Value
Client compares with cached hash

6. 全章节覆盖矩阵

规范章节	标题	对应学习篇
1	Introduction	第 1～3 篇
1.1	Scope	第 1 篇
1.2	Profile dependency	第 2 篇
1.3	No longer used	第 3 篇
1.4	No longer used	第 3 篇
1.5	Conventions	第 3 篇
2	Profile overview	第 4 篇
2.1	Protocol stack	第 5 篇
2.2	Configurations and roles	第 6 篇
2.3	User requirements and scenarios	第 7 篇
2.4	Profile fundamentals	第 8 篇
2.5	Attribute Protocol	第 9～14 篇
2.5.1	Overview	第 9～10 篇
2.5.2	Attribute caching	第 11 篇
2.5.2.1	Robust Caching	第 12 篇
2.5.3	Attribute grouping	第 13 篇
2.5.4	UUIDs	第 14 篇
2.6	GATT Profile hierarchy	第 15～18 篇
2.6.1	Overview	第 15 篇
2.6.2	Service	第 16 篇
2.6.3	Included services	第 17 篇
2.6.4	Characteristic	第 18 篇
2.7	Configured Broadcast	第 19 篇
3	Service interoperability requirements	第 20～35 篇
3.1	Service definition	第 20 篇
3.2	Include definition	第 21 篇
3.3	Characteristic definition	第 22 篇
3.3.1	Characteristic declaration	第 23 篇
3.3.1.1	Characteristic Properties	第 24 篇
3.3.1.2	Characteristic Value Attribute Handle	第 25 篇
3.3.1.3	Characteristic UUID	第 26 篇
3.3.2	Characteristic Value declaration	第 27 篇
3.3.3	Characteristic descriptor declarations	第 28 篇
3.3.3.1	Characteristic Extended Properties	第 29 篇
3.3.3.2	Characteristic User Description	第 30 篇
3.3.3.3	Client Characteristic Configuration	第 31 篇
3.3.3.4	Server Characteristic Configuration	第 32 篇
3.3.3.5	Characteristic Presentation Format	第 33 篇
3.3.3.6	Characteristic Aggregate Format	第 34 篇
3.4	Summary of GATT Profile attribute types	第 35 篇
4	GATT feature requirements	第 36～69 篇
4.1	Overview	第 36 篇
4.2	Feature support and procedure mapping	第 37 篇
4.3	Server configuration	第 38 篇
4.3.1	Exchange MTU	第 38 篇
4.4	Primary Service Discovery	第 39～41 篇
4.4.1	Discover All Primary Services	第 40 篇
4.4.2	Discover Primary Service by Service UUID	第 41 篇
4.5	Relationship Discovery	第 42 篇
4.5.1	Find Included Services	第 42 篇
4.6	Characteristic discovery	第 43～45 篇
4.6.1	Discover All Characteristics of a Service	第 44 篇
4.6.2	Discover Characteristics by UUID	第 45 篇
4.7	Characteristic Descriptor Discovery	第 46 篇
4.7.1	Discover All Characteristic Descriptors	第 46 篇
4.8	Characteristic Value Read	第 47～52 篇
4.8.1	Read Characteristic Value	第 48 篇
4.8.2	Read Using Characteristic UUID	第 49 篇
4.8.3	Read Long Characteristic Value	第 50 篇
4.8.4	Read Multiple Characteristic Values	第 51 篇
4.8.5	Read Multiple Variable Length Characteristic Values	第 52 篇
4.9	Characteristic Value Write	第 53～58 篇
4.9.1	Write Without Response	第 54 篇
4.9.2	Signed Write Without Response	第 55 篇
4.9.3	Write Characteristic Value	第 56 篇
4.9.4	Write Long Characteristic Value	第 57 篇
4.9.5	Characteristic Value Reliable Writes	第 58 篇
4.10	Characteristic Value Notification	第 59～61 篇
4.10.1	Single Notification	第 60 篇
4.10.2	Multiple Variable Length Notifications	第 61 篇
4.11	Characteristic Value Indication	第 62 篇
4.11.1	Indication	第 62 篇
4.12	Characteristic Descriptors	第 63～67 篇
4.12.1	Read Characteristic Descriptor	第 64 篇
4.12.2	Read Long Characteristic Descriptor	第 65 篇
4.12.3	Write Characteristic Descriptor	第 66 篇
4.12.4	Write Long Characteristic Descriptor	第 67 篇
4.13	GATT procedure mapping to ATT protocol opcodes	第 68 篇
4.14	Procedure timeouts	第 69 篇
5	L2CAP interoperability requirements	第 70～75 篇
5.1	BR/EDR L2CAP interoperability requirements	第 71 篇
5.1.1	ATT_MTU	第 71 篇
5.1.2	BR/EDR channel requirements	第 71 篇
5.1.3	No longer used	第 71 篇
5.2	LE L2CAP interoperability requirements	第 72 篇
5.2.1	ATT_MTU	第 72 篇
5.2.2	LE channel requirements	第 72 篇
5.3	Enhanced ATT bearer L2CAP interoperability requirements	第 73 篇
5.3.1	ATT_MTU	第 73 篇
5.3.2	Channel Requirements	第 73 篇
5.4	L2CAP collision mitigation	第 74 篇
5.5	Bearer support	第 75 篇
6	GAP interoperability requirements	第 76～80 篇
6.1	BR/EDR GAP interoperability requirements	第 77 篇
6.1.1	Connection Establishment	第 77 篇
6.2	LE GAP interoperability requirements	第 78～79 篇
6.2.1	Connection Establishment	第 78 篇
6.2.2	Profile roles	第 79 篇
6.3	Disconnected events	第 80 篇
6.3.1	Notifications and indications while disconnected	第 80 篇
7	Defined GATT service	第 81～86 篇
7.1	Service Changed	第 82 篇
7.2	Client Supported Features	第 83 篇
7.3	Database Hash	第 84 篇
7.3.1	Database Hash calculation	第 85 篇
7.4	Server Supported Features	第 86 篇
8	Security considerations	第 87～89 篇
8.1	Authentication requirements	第 88 篇
8.2	Authorization requirements	第 89 篇
9	SDP interoperability requirements	第 90 篇
10	References	第 91 篇
Appendix A	Example ATT Server contents	第 92～93 篇
Appendix B	Example Database Hash	第 94 篇

7. 推荐学习顺序

如果按"博客连载"方式推进，推荐顺序如下：
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.vertText{font-size:15px;text-anchor:middle;fill:navy!important;}#mermaid-svg-FptUC6Cfucsi4GV2 .activeCritText0,#mermaid-svg-FptUC6Cfucsi4GV2 .activeCritText1,#mermaid-svg-FptUC6Cfucsi4GV2 .activeCritText2,#mermaid-svg-FptUC6Cfucsi4GV2 .activeCritText3{fill:black!important;}#mermaid-svg-FptUC6Cfucsi4GV2 .titleText{text-anchor:middle;font-size:18px;fill:#333;font-family:"trebuchet ms",verdana,arial,sans-serif;}#mermaid-svg-FptUC6Cfucsi4GV2 :root{--mermaid-font-family:"trebuchet ms",verdana,arial,sans-serif;} 07-12 07-19 07-26 08-02 08-09 08-16 08-23 08-30 09-06 09-13 09-20 09-27 10-04 Introduction 与 Profile Dependency Profile Overview Attribute Protocol GATT Hierarchy Service / Characteristic / Descriptor Feature Requirements Overview Discovery Read / Write Notification / Indication Descriptor Procedures Opcode Mapping / Timeout L2CAP Requirements GAP Requirements Defined GATT Service Security / SDP Appendix A/B 基础定位数据模型操作过程互操作与系统集成实战附录 GATT Part G 学习阶段规划

8. 每篇文章的学习颗粒度

每篇文章不是只写"概念总结"，而是按以下粒度推进：
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逐句翻译
术语拆解
协议意图
工程实现
抓包对应
易错点
本篇总结

9. 总结

这版学习计划的特点是：

严格按规范目录覆盖，不再把小节合并掉。
所有子章节都有归属文章，包括废弃章节、References、Appendix。
重点章节拆得更细，尤其是：
- Attribute caching
- Robust Caching
- Characteristic Descriptor
- CCCD
- Read / Write / Notify / Indicate
- ATT Opcode mapping
- L2CAP / GAP interoperability
- Database Hash

一句话概括：

GATT 不是一个"读写接口"那么简单，它是一整套基于 ATT 的服务数据库模型、访问过程、缓存机制、安全规则和互操作约束。

这套计划就是把这座"蓝牙服务大厦"从地基、楼层、房间号、门锁、访客登记表，一层一层拆开看。