capture android bluetooth package

after fight with android bluetooth with gdb, last night I read 360 Unicorn's book, I realize I can use a more symple way, using bluetooth snoop to capture the package

facility

pixel: android 9

steps

1. In Developer options: enable enable bluetooth hci snoop log
2. get capture fill by adb pull /data/misc/bluetooth/logs/btsnoop_hci.log
3. wireshark open btsnoop_hci.log