Android使用蓝牙收集服务器

Question

对于一个应用程序，我需要一个Android设备既是一个Ble Gatt外设和服务器，以接受传入和传出的邮件;然而，似乎除了在github上查看其他人的项目外，我无法找到关于建立和维护服务器的许多信息。 任何人都可以告诉我正确的解决方案或指导我有关设置BluetoothGattServer的更多信息。

Answer 1

我想快速提及，大多数使用的Android设备不支持BluetoothGattServer。不过新型号的功能越来越多。

首先您可能想要宣传您的服务，以便其他设备了解服务器。为此，我们需要创建AdvertiseSettings，AdvertiseData和AdvertData for ScanResponses。

AdvertiseSettings settings = new AdvertiseSettings.Builder() 
       .setConnectable(true) 
       .build(); 

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

AdvertiseData scanResponseData = new AdvertiseData.Builder() 
        .addServiceUuid(new ParcelUuid(your_service_uuid)) 
        .setIncludeTxPowerLevel(true) 
        .build(); 

之后，你需要创建广告状态回调：

AdvertiseCallback callback = new AdvertiseCallback() { 
       @Override 
       public void onStartSuccess(AdvertiseSettings settingsInEffect) { 
        Log.d(TAG, "BLE advertisement added successfully"); 
       } 

       @Override 
       public void onStartFailure(int errorCode) { 
        Log.e(TAG, "Failed to add BLE advertisement, reason: " + errorCode); 
       } 
      }; 

现在你可以开始宣传你的服务：

BluetoothLeAdvertiser bluetoothLeAdvertiser = mBluetoothAdapter.getBluetoothLeAdvertiser(); 
bluetoothLeAdvertiser.startAdvertising(settings, advertiseData, scanResponseData, callback); 

因为我们需要先创建BluetoothGattServer a BluetoothGattServerCallback：

BluetoothGattServerCallback callback = new BluetoothGattServerCallback() { 
      @Override 
      public void onConnectionStateChange(BluetoothDevice device, int status, int newState) { 
       super.onConnectionStateChange(device, status, newState); 
      } 

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

      @Override 
      public void onCharacteristicReadRequest(BluetoothDevice device, int requestId, int offset, BluetoothGattCharacteristic characteristic) { 
       super.onCharacteristicReadRequest(device, requestId, offset, characteristic); 
      } 

      @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); 
      } 

      @Override 
      public void onDescriptorWriteRequest(BluetoothDevice device, int requestId, BluetoothGattDescriptor descriptor, boolean preparedWrite, boolean responseNeeded, int offset, byte[] value) { 
       super.onDescriptorWriteRequest(device, requestId, descriptor, preparedWrite, responseNeeded, offset, value); 
      } 

      @Override 
      public void onDescriptorReadRequest(BluetoothDevice device, int requestId, int offset, BluetoothGattDescriptor descriptor) { 
       super.onDescriptorReadRequest(device, requestId, offset, descriptor); 
      } 

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

      @Override 
      public void onMtuChanged(BluetoothDevice device, int mtu) { 
       super.onMtuChanged(device, mtu); 
      } 

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

您不需要实现所有这些方法，只需要那些您感兴趣的方法。例如，您可以实现onCharacteristicReadRequest（...）方法以将数据返回到读取BluetoothGattServer上的特性的设备。

之后，你可以打开一个GattServer，创建服务和服务添加到服务器：

BluetoothGattServer bluetoothGattServer = mBluetoothManager.openGattServer(Context, callback); 
BluetoothGattService service = new BluetoothGattService(your_service_uuid, BluetoothGattService.SERVICE_TYPE_PRIMARY); 

//add a read characteristic. 
BluetoothGattCharacteristic characteristic = new BluetoothGattCharacteristic(your_characteristic_uuid, BluetoothGattCharacteristic.PROPERTY_READ, BluetoothGattCharacteristic.PERMISSION_READ); 

service.addCharacteristic(characteristic) 

bluetoothGattServer.addService(service); 

现在你已经设置了写特性，您BluetoothGattServer从其他设备可以读取。 我希望这个简短的总结对你有帮助，否则我会尽力帮你澄清不清楚的事情。