蓝牙学习笔记三(Android Debug)

android 端可以通过两种方式去Debug:

一、在手机的设置功能里,开发者模式 Enable,如下图:
蓝牙学习笔记三(Android Debug)_第1张图片

http://blog.bluetooth.com/debugging-bluetooth-with-an-android-app
然后在手机的根目录下有一个名类似叫: btsnoop_hci.log 的日志.
通过工具 Wireshark 查看日志:
蓝牙学习笔记三(Android Debug)_第2张图片
host对应的是主机, controller对应的是控制器。

Android端查看蓝牙日志:
http://www.fte.com/webhelp/sodera/Content/Documentation/WhitePapers/BPA600/Encryption/GettingAndroidLinkKey/RetrievingHCIlog.htm
https://www.nowsecure.com/blog/2014/02/07/bluetooth-packet-capture-on-android-4-4/
日志数据的分析:
http://www.fte.com/webhelp/FTS4BT/Content/Technical_Information/BT_Snoop_File_Format.htm
https://blog.csdn.net/sinat_19628093/article/details/52149189


二、通过Packet Sniffer 工具抓包分析:
需要购买一个抓包神器,低功耗BLE CC2540 USB Dongle,通过它来抓包.
蓝牙学习笔记三(Android Debug)_第3张图片

抓包后的数据:
蓝牙学习笔记三(Android Debug)_第4张图片
对应标识的解释如下:
Field #
Source
Explanation
Core spec chapter
1
Sniffer
Packet number as logged by the sniffer
 
2
Capture device
Time in microseconds since last packet was received and absolute time
 
3
Capture device
Radio channel data was captured on
6.B.1.4.1
4
Air
Bluetooth spec specified address for advertising and scan response
6.B.2.1.2
5
Air
Type of advertisement packet
6.B.2.3
6
Air
Header
6.B.2.3
7
Air
Advertiser IEEE address
6.B.2.3
8
Air
Advertisement data. In this example it's capabilities and three UUIDs the device provides.
6.B.2.3 / 3.C.11 / 3.C.18.1
9
Air
Precalculated CRC checksum
6.B.2.1.4
10
Capture device
Received signal strength indicator.
 
11
Capture device
Field Control Sequence. If OK, the checksum is correct
 
The advertisement fields are further explained in 6.B.2.3 on page 2202 of the BT core spec.

5 是广播报文的类型,共7种:
1、ADV_IND——通用广播指示
2、ADV_DIRECT_IND—— 定向连接指示
3、ADV_NONCONN_IND—— 不可连接指示
4、ADV_SCAN_IND——可扫描指示
5、SCAN_REQ——主动扫描请求
6、SCAN_RSP——主动扫描响应
7、COMNNECT_REQ——连接请求

广播报文,接入地址为固定值:0x8E89BED6

报文结构:
   8       32     8   8                0~296                  24          比特
前导
接入地址
报头
长度
数据
循环冗余校验


广播报文的长度域:6~37
数据报文的长度域:0~31
这两者的区别在于:广播报文需要加上 6个字节的广播地址

发起连接的抓包情况:
蓝牙学习笔记三(Android Debug)_第5张图片

蓝牙规范 Bluetooth 4.0 Core Specification [2]  Volume 6, Part B, chapters 2.1, 2.3 and 2.4.
TI 官网有关于sniffer 抓包分析的资料
http://processors.wiki.ti.com/index.php/BLE_sniffer_guide


debug总结:
http://www.argenox.com/bluetooth-low-energy-ble-v4-0-development/library/ultimate-guide-to-debugging-bluetooth-smart-ble-products/

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