Question

我正在尝试在NEXUS 9中做广告并获得ADVERTISE_FAILED_DATA_TOO_LARGE的错误。在成功通告后添加服务时，它工作得非常好，但如果我通过“广告数据”构建器添加服务，以便其他设备可以在扫描时过滤，则会收到错误代码1，即ADVERTISE_FAILED_DATA_TOO_LARGE

a）工作守则

     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）最初添加服务时无法正常工作，以便中央通过过滤器发现：

在调用BLEBroadcast()之前调用startAdvertisingService()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

我怀疑这是引起麻烦的代码行：

advertiseData.setIncludeDeviceName(true);

广告没有足够的空间用于设备名称和16字节服务UUID。因此，如果您包含上述内容，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，您的数据超过31个字节，因此您需要将其削减。

将此更改为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。例如：XYZ_Name_pic-> XYZ

转到蓝牙->设置->重命名设备名称

或者您可以通过false代替true

advertiseData.setIncludeDeviceName（false）; //传递false不正确

蓝牙外设ADVERTISE_FAILED_DATA_TOO_LARGE

3 个答案: