Question

我正在尝试使用我的Android设备创建外设蓝牙LE。我也想发送它的特色。

所以我做了这些步骤：

1-使用NOTIFY属性和READ权限创建BluetoothGattCharacteristic。

2-添加以字节编码的字符串值

3-创建BluetoothGattService并将特征添加到此服务

4-创建BluetoothGattServer并向服务器添加服务

5-启动BluetoothLeAdvertiser

以下是代码：

private void advertise() {

    String toBeSent = "I'm an Android" + "EOM";
    BluetoothGattCharacteristic ccc = new BluetoothGattCharacteristic(
            UUID.fromString(getString(R.string.ble_uuid)),
            BluetoothGattCharacteristic.PROPERTY_NOTIFY,
            BluetoothGattCharacteristic.PERMISSION_READ
    );

    BluetoothGattService service = new BluetoothGattService(UUID.fromString(getString(R.string.ble_uuid)), BluetoothGattService.SERVICE_TYPE_PRIMARY);
    byte[] bytes = toBeSent.getBytes(StandardCharsets.UTF_8);
    ccc.setValue(bytes);

BluetoothGattDescriptor descriptor = new BluetoothGattDescriptor(UUID.fromString(getString(R.string.ble_uuid)), BluetoothGattDescriptor.PERMISSION_READ);
    descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
    ccc.addDescriptor(descriptor);

    service.addCharacteristic(ccc);

    BluetoothManager manager = (BluetoothManager) getSystemService (Context.BLUETOOTH_SERVICE);

    BluetoothGattServer server = manager.openGattServer(this, new BluetoothGattServerCallback() {
        @Override
        public void onConnectionStateChange(BluetoothDevice device, int status, int newState) {
            super.onConnectionStateChange(device, status, newState);
            Log.i("onConnectionStateChange", "Status: " + status);
            switch (newState) {
                case BluetoothProfile.STATE_CONNECTED:
                    Log.i("gattCallback", "STATE_CONNECTED");
                    break;
                case BluetoothProfile.STATE_DISCONNECTED:
                    Log.e("gattCallback", "STATE_DISCONNECTED");
                    found = false;
                    break;
                default:
                    Log.e("gattCallback", "STATE_OTHER");
            }
        }

        @Override
        public void onServiceAdded(int status, BluetoothGattService service) {
            super.onServiceAdded(status, service);
        }

        @Override
        public void onExecuteWrite(BluetoothDevice device, int requestId, boolean execute) {
            super.onExecuteWrite(device, requestId, execute);
        }

        @Override
        public void onNotificationSent(BluetoothDevice device, int status) {
            super.onNotificationSent(device, status);
        }

        @Override
        public void onCharacteristicWriteRequest(BluetoothDevice device, int requestId, BluetoothGattCharacteristic characteristic, boolean preparedWrite, boolean responseNeeded, int offset, byte[] value) {
            super.onCharacteristicWriteRequest(device, requestId, characteristic, preparedWrite, responseNeeded, offset, value);
        }
    });
    server.addService(service);

    BluetoothLeAdvertiser advertiser = BluetoothAdapter.getDefaultAdapter().getBluetoothLeAdvertiser();

        AdvertiseSettings settings = new AdvertiseSettings.Builder()
                .setAdvertiseMode( AdvertiseSettings.ADVERTISE_MODE_LOW_LATENCY )
                .setTxPowerLevel( AdvertiseSettings.ADVERTISE_TX_POWER_HIGH )
                .setConnectable(true)
                .build();

        ParcelUuid pUuid = new ParcelUuid( UUID.fromString( getString( R.string.ble_uuid ) ) );

        AdvertiseData data = new AdvertiseData.Builder().setIncludeDeviceName(false).addServiceUuid( pUuid )
                .build();

        AdvertiseCallback advertisingCallback = new AdvertiseCallback() {
            @Override
            public void onStartSuccess(AdvertiseSettings settingsInEffect) {
                super.onStartSuccess(settingsInEffect);
            }

            @Override
            public void onStartFailure(int errorCode) {
                super.onStartFailure(errorCode);
            }
        };

        advertiser.startAdvertising( settings, data, advertisingCallback );
}

我正试图在BLE Central模式下在iOS设备上读取此服务器的特征。我可以发现并连接到Android外设，但我无法读取特征值，因为通知标志（或位）似乎没有被监听。换句话说，iOS设备可以看到特征，但启用特征通知的方法似乎无法正常工作。

[peripheral setNotifyValue:YES forCharacteristic:characteristic];

iOS中心找到特征，但不会调用通知委托，因为找不到NOTIFY属性。

我尝试将这个iOS中心与iOS外设连接起来，启用了特性的NOTIFY属性，一切运行良好，所以我首先想到的是我在Android中遗漏了一些东西。 Android部分完全正确吗？

为了更加清晰，这里的特征是从Android开始并到达iOS：

Android characteristic

iOS characteristic

BluetoothGattServer特性：无法启用BluetoothGattCharacteristic通知

0 个答案: