Android Bluetooth How To(Based on Android L Bluedroid)
持续更新中…
1、How to enable btsnoop log?
a) UI Settings-->
b) Developer Options-->
c) reboot Tablet, then snoop log will locate in /sdcard/btsnoop_hci.log(this path can be configured in /etc/bluetooth/bt_stack.conf)
2、If developer options default not enabled, you can use following steps to enable it
a) Settings-->
b) About Tablet-->
c) Click 4 or 5 times or more in Build Number-->
d)then, Develop options will comeout-->
Pls also be noted that how to enable Developer Options might depend on system and Android Versions
3、bluedroid useful config files
a) bt_stack.conf
i. 此文件保存在/etc/bluetooth/目录下，用于配置抓取bluedroid协议栈log的方式和log的级别
b) bt_config.xml
i.此文件在/data/misc/bluedroid/目录下，保存了当前BT设备、扫描到的BT设备以及配对过的BT设备的信息，包括device name、BD_ADDR、link key、Report Descriptor(HID)等等
4、How to enable & adjust bluedroid debug log level?
a) this should customized in /etc/bluetooth/bt_stack.conf
b) enable btsnoop log -->
i.set BtSnoopLogOutput to true
BtSnoopLogOutput=true
ii. set BtSnoopFileName to path you want to save btsnoop log
BtSnoopFileName=/sdcard/btsnoop_hci.log
c) adjust trace & debug level
i. set TraceConf to true
TraceConf=true
ii. 根据需要设置debug level，默认是2，通常debug的时候，都是将level默认设置为5来抓log，这样可以打出更多的信息(logcat)
TRC_BTM=5
TRC_HCI=5
TRC_L2CAP=5
TRC_RFCOMM=5
TRC_OBEX=5
TRC_AVCT=5
TRC_AVDT=5
TRC_AVRC=5
TRC_AVDT_SCB=5
TRC_AVDT_CCB=5
TRC_A2D=5
TRC_SDP=5
TRC_GATT=5
TRC_SMP=5
TRC_BTAPP=5
TRC_BTIF=5
5、Android Bluetooth相关code路径
a) bluedroid协议栈
i. <Android Root>/external/bluetooth/bluedroid/
b) Bluetooth.apk
i. <Android Root>/packages/apps/Bluetooth/
c) Settings.apk
i. <Android Root>/packages/apps/Settings/src/com/android/settings/bluetooth
d) hal头文件
i. <Android Root>/hardware/libhardware/include/hardware/
e) framework相关
i. <Android Root>/frameworks/base/core/java/android/bluetooth
ii. <Android Root>/frameworks/base/services/core/java/com/android/server/ BluetoothManagerService.java
6、bluedroid build出来的binary
a) bluetooth.default.so
i. 这个协议栈的profile、stack所编译出来的，是bluedroid的精华所在
b) audio.a2dp.default.so
i. 这个是a2dp和audio的hal接口
c) libbt-vendor.so
i. vendor自己实现的，用于将bluedroid协议栈铜特定的芯片driver接起来
7、 Android BT基本架构