android - 如何使用 BluetoothLeScanner 类广播 iBeacon？

Question

我想用 BluetoothLeAdvertiser 通过 android 传输 iBluetooth来自 android.bluetooth.le 的类(class).但我似乎无法设置某些制造商规范数据字段以匹配 iBeacon 的字段。


iBeacon结构:

This和 this告诉您 iBeacon 的 Manufacturer spec data 值需要包含什么。基本上:

Apple Company Identifier (Little Endian), 0x004c = 76
data type, 0x02 => iBeacon
data length, 0x15 = 21
uuid: 585CDE931B0142CC9A1325009BEDC65E
major: [0000]
minor: 0000
meaured power at 1 meter: 0xc5 = -59

---

我一直在关注 this tutorial具有以下步骤:

1. 创建 AdvertiseData对象使用 AdvertiseData.Builder.addManufacturerData() (我认为应该是制造商规范数据，请参阅下面的问题)

   protected void setAdvertiseData() {
   
     AdvertiseData.Builder mBuilder = new AdvertiseData.Builder();
   
     ByteBuffer mManufacturerData = ByteBuffer.allocate(24);
   
     byte[] uuid = getIdAsByte(UUID.fromString("0CF052C2-97CA-407C-84F8-B62AAC4E9020"));
   
     mManufacturerData.put(0, (byte)0xBE); // Beacon Identifier
   
     mManufacturerData.put(1, (byte)0xAC); // Beacon Identifier
   
     for (int i=2; i<=17; i++) {
   
       mManufacturerData.put(i, uuid[i-2]); // adding the UUID
   
     }
   
     mManufacturerData.put(18, (byte)0x00); // first byte of Major
     mManufacturerData.put(19, (byte)0x09); // second byte of Major
     mManufacturerData.put(20, (byte)0x00); // first minor
     mManufacturerData.put(21, (byte)0x06); // second minor
     mManufacturerData.put(22, (byte)0xB5); // txPower
     mBuilder.addManufacturerData(224, mManufacturerData.array()); // using google's company ID
     mAdvertiseData = mBuilder.build();
   }
   

2. 创建 AdvertiseSettings使用 AdvertiseSettings.Builder

   protected void setAdvertiseSettings() {
     AdvertiseSettings.Builder mBuilder = new AdvertiseSettings.Builder();
     mBuilder.setAdvertiseMode(AdvertiseSettings.ADVERTISE_MODE_LOW_POWER);
     mBuilder.setConnectable(false);
     mBuilder.setTimeout(0);
     mBuilder.setTxPowerLevel(AdvertiseSettings.ADVERTISE_TX_POWER_MEDIUM);
     mAdvertiseSettings = mBuilder.build();
   }
   

3. 使用 BluetoothLeAdvertiser 广播 AdvertiseSettings 和 AdvertiseData . (这也需要一个回调，告诉蓝牙传输是否有效，没有问题)

   mBluetoothLeAdvertiser.startAdvertising(mAdvertiseSettings, mAdvertiseData, mAdvertiseCallback);
   

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这些步骤的问题是:

• 不清楚在哪里AdvertiseData.Builder.addManufacturerData()将其第二个 Byte[] manufacturerSpecificData 参数放在 Manufacturer spec data 中，特别是因为 AdvertiseData.Builder.addManufacturerData() 的第一个参数也是制造商规范数据

中的 制造商类型字段

• 以下BluetoothLeAdvertiser构造函数参数似乎将字节写入 Manufacturer spec data，覆盖在 addManufacturerData 中添加的字节

  • AdvertiseSettings.Builder.setTxPowerLevel和 PeriodicAdvertisingParameters.Builder.setIncludeTxPower将覆盖 AdvertiseData.Builder.addManufacturerData() 中设置的 TX 功率 (RSSI)并且在与其他一些组合时会相互覆盖 BluetoothLeAdvertiser像BluetoothLeAdvertiser.startAdvertisingSet这样的功能.
  • 虽然我给出的示例中没有显示，AdvertiseData.Builder还有函数 addServiceUuid这将覆盖在 AdvertiseData.Builder.addManufacturerData() 中添加的 UUID
    

---

一开始我关注的是 this教程，并正在传输一个 Alt-Beacon。也许是 BluetoothLeAdvertiser class 假设我仍在传输与 iBeacon 结构不同的 Alt-Beacon。

Alt-Beacon 结构:

其他资源:

• ti docs on BLE
• decompiled source for all these functions
• Android Bluetooth Low Energy tutorial

更新代码

public AdvertiseData getiBeaconData() {
    AdvertiseData.Builder mBuilder = new AdvertiseData.Builder();
    ByteBuffer mManufacturerData = ByteBuffer.allocate(24);

    byte[] uuid = getIdAsByte(UUID.fromString(thisCont.getString( R.string.ble_uuid )) );
    ParcelUuid parced = new ParcelUuid(UUID.fromString(thisCont.getString( R.string.ble_uuid )) );
    /*

R.string.ble_uuid == CDB7950D-73F1-4D4D-8E47-C090502DBD63 这是关于 iBeacon 结构 http://smlie-blog.blogspot.com/2014/06/bluetooth-ibeacon-packet-format.html */

    //mManufacturerData.put((byte)0x00); //Manufactor Id 1
    //mManufacturerData.put((byte)0x4C); //Manufactor Id 2
   // mManufacturerData.put((byte)0xBE); //ibeconid1
    mManufacturerData.put((byte)0x02); //ibeconid2
    mManufacturerData.put((byte)0x15); //Data length
    for (byte i:uuid) {
        mManufacturerData.put(i); // adding the UUID
    }
    mManufacturerData.put((byte)0x00); //major first
    mManufacturerData.put((byte)0x00); //major second
    mManufacturerData.put((byte)0x00); //minor first
    mManufacturerData.put((byte)0x00); //minor second
    //mManufacturerData.put((byte)0xC5); //TX power

    /*
    mManufacturerData.put((byte)0x1A); // Beacon Identifier was BE  iBeacon = 00
    mManufacturerData.put((byte)0xFF); // Beacon Identifier was AC  iBeacon = 02
    /* the above 2 lines are the ibeacon AD Indicator

    for (byte i:uuid) {
        mManufacturerData.put(i); // adding the UUID
    }
    mManufacturerData.put((byte)0x00); // first byte of Major
    mManufacturerData.put((byte)0x00); // second byte of Major
    mManufacturerData.put((byte)0x00); // first minor
    mManufacturerData.put((byte)0x00); // second minor
    mManufacturerData.put((byte)0xC5); // txPower (RSSI) (from tx)
    mBuilder.addManufacturerData(16, mManufacturerData.array()); // using google's company ID
    */

    mBuilder.addManufacturerData(76, mManufacturerData.array()); // using google's company ID
    //mBuilder.addServiceUuid(parced);
    return mBuilder.build();

}

Answer 1

我觉得你的代码很好。一些评论:

• Apple 的制造商 ID 是 76:mBuilder.addManufacturerData(76, mManufacturerData.array())
• iBeacon 类型为 0x02:mManufacturerData.put(0, (byte)0x02);//信标标识符
• 长度为 0x15:mManufacturerData.put(1, (byte)0x15);//信标标识符
• 我不确定这是否有效:UUID.fromString("0CF052C297CA407C84F8B62AAC4E9020")。通常 fromString() 方法需要这样的东西:UUID.fromString("F0018B9B-7509-4C31-A905-1A27D39C003D")

总结:

protected void setAdvertiseData() {

     AdvertiseData.Builder mBuilder = new AdvertiseData.Builder()

     ByteBuffer mManufacturerData = ByteBuffer.allocate(23);

     byte[] uuid = getIdAsByte(UUID.fromString("0CF052C297CA407C84F8B62AAC4E9020"));

     mManufacturerData.put(0, (byte)0x02);
     mManufacturerData.put(1, (byte)0x15); 

     for (int i=2; i<=17; i++) {
       mManufacturerData.put(i, uuid[i-2]); // adding the UUID
     }

     mManufacturerData.put(18, (byte)0x00); // first byte of Major
     mManufacturerData.put(19, (byte)0x09); // second byte of Major
     mManufacturerData.put(20, (byte)0x00); // first minor
     mManufacturerData.put(21, (byte)0x06); // second minor
     mManufacturerData.put(22, (byte)0xB5); // txPower

     mBuilder.addManufacturerData(76, mManufacturerData.array()); 
     mAdvertiseData = mBuilder.build();
}