Android Bluetooth LE API onScanResult ScanRecord字节的含义

Question

I am developing an app which scans for beacons in range and displays beacons' data to the user. I am using Android Bluetooth LE API. In onScanResult() method I get ScanResult object which I then parse to raw bytes. This is a sample of what I get from one of my beacons:

02:01:06:1A:FF:4C:00:02:15:74:27:8B:DA:B6:44:45:20:8F:0C:72:0E:AF:05:99:35:00:00:00:01:C5:02:0A:00:08:16:F0:FF:64:00:00:00:01:11:09:4D:69:6E:69:42:65:61:63:6F:6E:5F:33:36:38:35:30:00:00

I had no problems with finding out what the first part mean - it corresponds to the iBeacon format:

02:01:06:1A:FF:4C:00:02:15 - iBeacon prefix
74:27:8B:DA:B6:44:45:20:8F:0C:72:0E:AF:05:99:35 - UUID
00:00 - Major
00:01 - Minor
C5 - TX power

But I have completely no idea what the rest of the bytes are. Are these some kind of manufacturer specific data or what? Can they be used to get any useful information?

02:0A:00:08:16:F0:FF:64:00:00:00:01:11:09:4D:69:6E:69:42:65:61:63:6F:6E:5F:33:36:38:35:30:00:00

Answer 1

Bluetooth packets are broken down into what are called PDUs. A PDU starts with a one byte length followed by a one byte type. The interpretation of the remaining bytes is specific to the PDU type.

Some of that extra data is of interest (mainly the Bluetooth name) but most of it is not.

So these bytes mean:

02:0A:00 (Flags PDU. Not of much interest.)

08:16:F0:FF:64:00:00:00:01 (Service Data PDU. Service UUID: FFF0, Service Data: 64:00:00:00:01)

11:09:4D:69:6E:69:42:65:61:63:6F:6E:5F:33:36:38:35:30 (Complete Local Name PDU: "MiniBeacon_36850")

00:00 (Buffer fill)