IBeacon協議分析

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對於一個UUID是E2C56DB5-DFFB-48D2-B060-D0F5A71096E0, major是0, minjor是0的iBeacon，此時的Tx的信號是-59 RSSI，他的BLE的廣播包如下：

d6 be 89 8e 40 24 05 a2 17 6e 3d 71 02 01 1a 1a ff 4c 00 02 15 e2 c5 6d b5 df fb 48 d2 b0 60 d0 f5 a7 10 96 e0 00 00 00 00 c5 52 ab 8d 38 a5

以上協議包拆解內容如下:

d6 be 89 8e # Access address for advertising data (this is always the same fixed value)
40 # Advertising Channel PDU Header byte 0.  Contains: (type = 0), (tx add = 1), (rx add = 0)
24 # Advertising Channel PDU Header byte 1.  Contains:  (length = total bytes of the advertising payload + 6 bytes for the BLE mac address.)
05 a2 17 6e 3d 71 # Bluetooth Mac address (note this is a spoofed address)
02 01 1a 1a ff 4c 00 02 15 e2 c5 6d b5 df fb 48 d2 b0 60 d0 f5 a7 10 96 e0 00 00 00 00 c5 # Bluetooth advertisement
52 ab 8d 38 a5 # checksum

協議包中的關鍵部分就是藍牙的廣播部分，這些被分解為如下：

02 01 1a 1a ff 4c 00 02 15  # Apple's fixed iBeacon advertising prefix
e2 c5 6d b5 df fb 48 d2 b0 60 d0 f5 a7 10 96 e0 # iBeacon profile uuid
00 00 # major 
00 00 # minor 
c5 # The 2's complement of the calibrated Tx Power

所有的BLE設備都可以發送以上格式的廣播包