BLE获得UUID EN codeD广告包 [英] BLE obtain uuid encoded in advertising packet

问题描述

我试着去获得BLE装置UUID。我在下面的Andr​​oid开发者指南，到目前为止，我可以得到唯一的设备名称和RSSI。我试着去得到那个来扫描方法的装置，看起来像这样的UUID：

Im trying to get UUID of ble device. I was following android developers guide and so far I can get only device name and rssi. Im trying to get Uuid of the device that comes to scanning method that looks like this:

    public void onLeScan(final BluetoothDevice device, int rssi,byte[] scanRecord) {

        ParcelUuid[] myUUid =device.getUuids();
        for(ParcelUuid a :myUUid){
            Log.d("UUID",a.getUuid().toString());
        }
        String s = new String(scanRecord);
        int len = scanRecord.length;
        String scanRecords =new String(scanRecord) ;



        deviceMap.put(device.getName().toString(), rssi);
        Message msg = MainActivity.myHandler.obtainMessage();
        Bundle bundle = new Bundle();
        bundle.putCharSequence("dev_name", device.getName().toString());
        bundle.putCharSequence("rssi", Integer.toString(rssi));
        msg.setData(bundle);
        MainActivity.myHandler.sendMessage(msg);
   }

这将返回 - btif_gattc_upstreams_evt：事件4096

this returns - btif_gattc_upstreams_evt: Event 4096

推荐答案

如果你想获得UUID /任何其它数据如制造商的数据出来BLE扫描后scanRec []字节，你首先需要了解这些广告数据包的数据格式。

If you want to get UUID / any other data e.g. Manufacturer Data out of scanRec[] bytes after BLE Scan, you first need to understand the data format of those Advertisement Data packet.

来自Bluetooth.org：

Came from Bluetooth.org:

太多的理论，要看到一些code段？下面这个函数会直接前进打印分析原始数据字节。现在，你需要了解每种类型的code知道指的是什么样的数据包，以什么样的信息。例如类型：×09，是指BLE设备名称，型号：0×07，指的是UUID。

Too much theory, want to see some code snippet? This function below would straight forward print parsed raw data bytes. Now, you need to know each type code to know what data packet refers to what information. e.g. Type : 0x09, refers to BLE Device Name, Type : 0x07, refers to UUID.

public void printScanRecord (byte[] scanRecord) {

    // Simply print all raw bytes   
    try {
        String decodedRecord = new String(scanRecord,"UTF-8");
        Log.d("DEBUG","decoded String : " + ByteArrayToString(scanRecord));
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    }

    // Parse data bytes into individual records
    List<AdRecord> records = AdRecord.parseScanRecord(scanRecord);


    // Print individual records 
    if (records.size() == 0) {
        Log.i("DEBUG", "Scan Record Empty");
    } else {
        Log.i("DEBUG", "Scan Record: " + TextUtils.join(",", records));
    }

}


public static String ByteArrayToString(byte[] ba)
{
  StringBuilder hex = new StringBuilder(ba.length * 2);
  for (byte b : ba)
    hex.append(b + " ");

  return hex.toString();
}


public static class AdRecord {

    public AdRecord(int length, int type, byte[] data) {
        String decodedRecord = "";
        try {
            decodedRecord = new String(data,"UTF-8");

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        Log.d("DEBUG", "Length: " + length + " Type : " + type + " Data : " + ByteArrayToString(data));         
    }

    // ...

    public static List<AdRecord> parseScanRecord(byte[] scanRecord) {
        List<AdRecord> records = new ArrayList<AdRecord>();

        int index = 0;
        while (index < scanRecord.length) {
            int length = scanRecord[index++];
            //Done once we run out of records
            if (length == 0) break;

            int type = scanRecord[index];
            //Done if our record isn't a valid type
            if (type == 0) break;

            byte[] data = Arrays.copyOfRange(scanRecord, index+1, index+length);

            records.add(new AdRecord(length, type, data));
            //Advance
            index += length;
        }

        return records;
    }

    // ...
}

这个分析之后，这些数据字节会更有意义，你可以找出解码的一个新的水平。

After this parsing, those data bytes would make more sense, and you can figure out next level of decoding.

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