蓝牙外设 ADVERTISE_FAILED_DATA_TOO_LARGE

Question

我正在尝试在 NEXUS 9 中做广告并收到 ADVERTISE_FAILED_DATA_TOO_LARGE 的错误。当我在成功投放广告后添加服务时，它工作得非常好，但是如果我通过广告数据生成器添加服务，以便 其他设备可以在扫描时过滤 ，我得到错误代码 1，即 ADVERTISE_FAILED_DATA_TOO_LARGE

a) 工作代码

     public void startAdvertisingService() {
    AdvertiseSettings settings = new AdvertiseSettings.Builder()
            .setTxPowerLevel(AdvertiseSettings.ADVERTISE_TX_POWER_HIGH)
            .setTimeout(0)
            .setAdvertiseMode(AdvertiseSettings.ADVERTISE_MODE_LOW_LATENCY)      
            .build();


     AdvertiseData.Builder advertiseData = new AdvertiseData.Builder();
    advertiseData.setIncludeDeviceName(true);

     BluetoothLeAdvertiser myBluetoothLeAdvertiser = btAdapter.getBluetoothLeAdvertiser();
      myBluetoothLeAdvertiser.stopAdvertising(mAdvertiseCallback);

    myBluetoothLeAdvertiser.startAdvertising(settings, advertiseData.build(),mAdvertiseCallback);

   }
    private AdvertiseCallback mAdvertiseCallback = new AdvertiseCallback() {

    @Override
    public void onStartSuccess(AdvertiseSettings settingsInEffect) {
        super.onStartSuccess(settingsInEffect);
        BLEBroadcast();
    }

    @Override
    public void onStartFailure(int errorCode) {
        String description = "";
        if (errorCode == AdvertiseCallback.ADVERTISE_FAILED_FEATURE_UNSUPPORTED)
            description = "ADVERTISE_FAILED_FEATURE_UNSUPPORTED";
        else if (errorCode == AdvertiseCallback.ADVERTISE_FAILED_TOO_MANY_ADVERTISERS)
            description = "ADVERTISE_FAILED_TOO_MANY_ADVERTISERS";
        else if (errorCode == AdvertiseCallback.ADVERTISE_FAILED_ALREADY_STARTED)
            description = "ADVERTISE_FAILED_ALREADY_STARTED";
        else if (errorCode == AdvertiseCallback.ADVERTISE_FAILED_DATA_TOO_LARGE)
            description = "ADVERTISE_FAILED_DATA_TOO_LARGE";
        else if (errorCode == AdvertiseCallback.ADVERTISE_FAILED_INTERNAL_ERROR)
            description = "ADVERTISE_FAILED_INTERNAL_ERROR";
        else description = "unknown";

    }
};

并添加服务：

 void BLEBroadcast() {

    BluetoothGattCharacteristic characteristic = new     BluetoothGattCharacteristic(characteristicUUID, BluetoothGattCharacteristic.PROPERTY_NOTIFY | BluetoothGattCharacteristic.PROPERTY_INDICATE | BluetoothGattCharacteristic.PROPERTY_READ | BluetoothGattCharacteristic.PROPERTY_WRITE, BluetoothGattCharacteristic.PERMISSION_READ | BluetoothGattCharacteristic.PERMISSION_WRITE);

    BluetoothGattDescriptor desc = new BluetoothGattDescriptor(descriptorUUID, BluetoothGattDescriptor.PERMISSION_READ | BluetoothGattDescriptor.PERMISSION_WRITE);
    desc.setValue("".getBytes());

    characteristic.addDescriptor(desc);

    BluetoothGattService service = new BluetoothGattService(serviceUUID,     BluetoothGattService.SERVICE_TYPE_PRIMARY);
    service.addCharacteristic(characteristic);

    mGattServer.addService(service);
 }

b) 最初添加服务时不工作，以便中心可以通过过滤器发现：

在调用 startAdvertisingService() 之前调用 BLEBroadcast() 函数并添加

        AdvertiseData.Builder advertiseData = new AdvertiseData.Builder();
        advertiseData.addServiceUuid(new ParcelUuid(serviceUUID));

广告失败，错误代码为 1。

Answer 1

我怀疑这是导致问题的代码行：

advertiseData.setIncludeDeviceName(true);

广告中的设备名称和 16 字节服务 UUID 都不够 space。因此，如果您包括以上内容，请添加：

advertiseData.addServiceUuid(new ParcelUuid(serviceUUID));

您将收到您描述的错误。尝试删除第一行。

Answer 2

基本上你的数据超过了31个字节，所以你需要trim下来。

将其更改为 false，然后它将起作用：

advertiseData.setIncludeDeviceName(false);

Answer 3

您可以将设备名称更改为更短的名称。示例：XYZ_Name_pic -> XYZ

转到蓝牙 -> 设置 -> 重命名设备名称

或者您可以传递 false 而不是 true

advertiseData.setIncludeDeviceName(假); // 传假不真

蓝牙外设 ADVERTISE_FAILED_DATA_TOO_LARGE

Bluetooth Peripheral ADVERTISE_FAILED_DATA_TOO_LARGE

peripherals

android

bluetooth

bluetooth-lowenergy

cbperipheral