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android BLE Peripheral 做外设模拟设备，供ios、android 连接通讯。

2024-10-23 16:47:01   211人阅读

为了能让其它设备可以发现其设备，先启动特定广播。看自己需要什么广播格式。

android 对外发出广播，都一样，只是更改其中的方法：

android BLE Peripheral 模拟 ibeacon 发出ble 广播

开始广播： 增加使用BluetoothGattServer

 1 public void startAdvertising(MockServerCallBack callBack) { 2         //获取BluetoothLeAdvertiser，BLE发送BLE广播用的一个API 3         if (mBluetoothAdvertiser == null) { 4             mBluetoothAdvertiser = mBluetoothAdapter.getBluetoothLeAdvertiser(); 5         } 6         //创建BluetoothGattServerCallback， 7         // MockServerCallBack这个类继承自BluetoothGattServerCallback 8         // BluetoothGattServerCallback这个回调类主要是一些BLE读写的接口 9         // 关于BLE读写的操作都在这个Callback中完成10         if (mBluetoothAdvertiser != null) {11             mMockServerCallBack = callBack;12             //打开BluetoothGattServer13             mGattServer = mBluetoothManager.openGattServer(mActivity, mMockServerCallBack);14             if (mGattServer == null) {15                 Log.e(TAG, "gatt is null");16             }17             try {18                 mMockServerCallBack.setupServices(mActivity, mGattServer);20                 mBluetoothAdvertiser.startAdvertising(createAdvSettings(true, 0)21                         , createAdvertiseData(BluetoothUUID.bleServerUUID), mAdvCallback);22             } catch (Exception e) {23                 Log.v(TAG, "Fail to setup BleService");24             }25         }26 27         isAdvertising = true;28     }

创建广播，添加serviceUuid，广播内容，自行决定。

addServiceUuid(ParcelUuid serviceUuid) 的作用。

广播数据加入serviceUuid , 当其它设备扫描时，就可以根据此serviceUuid进行特定扫描.

扫描BLE设备的时候：启动扫描时，有可选参数，传入uuid数组。

BluetoothAdapterpublic boolean startLeScan(final UUID[] serviceUuids, final LeScanCallback callback)；

使用该函数启动扫描的，会根据所传入的uuid，去扫描过滤，只返回符合条件的设备。

注意：部分手机可能设置uuid后，扫描不到设备，可能底层扫描问题。

 1  public static AdvertiseData createAdvertiseData(UUID proximityUuid) { 2     AdvertiseData.Builder builder = new AdvertiseData.Builder(); 4     builder.addManufacturerData(0x0301, new byte[]{0x01, 0x03}); 5     builder.addServiceUuid(ParcelUuid.fromString(BluetoothUUID.bleServerUUID.toString()) 7     AdvertiseData adv = builder.build();10     return adv;11  }

 

BluetoothGattServerCallback：服务事件的回调

打开notification 对应的value为 BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE

打开indication 对应的value为 BluetoothGattDescriptor.ENABLE_INDICATION_VALUE

关闭notification 对应的value均为BluetoothGattDescriptor.DISABLE_NOTIFICATION_VALUE

服务事件响应过程：

(1) 当客户端开始写入数据时： 触发回调方法 onDescriptorWriteRequest

(2) 在 onDescriptorWriteRequest 方法中，执行下面的方法表示 写入成功 BluetoothGatt.GATT_SUCCESS

1 bluetoothGattServer.sendResponse(device, requestId, BluetoothGatt.GATT_SUCCESS, offset, value);2 // 执行 sendResponse后，会触发回调方法 onCharacteristicWriteRequest

(3) 在 onCharacteristicWriteRequest方法中:

1 public void onCharacteristicWriteRequest(BluetoothDevice device, int requestId2 , BluetoothGattCharacteristic characteristic, boolean preparedWrite, boolean responseNeeded, int offset, byte[] requestBytes) {3        // 这个里可以获得 来自客户端发来的数据 requestBytes4 }

(4) 处理响应内容

BluetoothGattServerCallback ：

  1 public class MockServerCallBack extends BluetoothGattServerCallback {  2   3 public void setupServices(Context context, BluetoothGattServer gattServer) throws InterruptedException {  4         if (gattServer == null) {  5             throw new IllegalArgumentException("gattServer is null");  6         }  7         mGattServer = gattServer;  8         // 设置一个GattService以及BluetoothGattCharacteristic  9         BluetoothGattService service = new BluetoothGattService(BluetoothUUID.bleServerUUID, 10                 BluetoothGattService.SERVICE_TYPE_PRIMARY); 11  12         BluetoothGattService service2 = new BluetoothGattService(BluetoothUUID.bleServerUUID2, 13                 BluetoothGattService.SERVICE_TYPE_PRIMARY); 14  15         //add a read characteristic. 16         // 当是ios设备连接过来时，需添加BluetoothGattCharacteristic.PROPERTY_INDICATE进行兼容。 17         mCharacteristicRead = new BluetoothGattCharacteristic(BluetoothUUID.readDataUUID 18                 , BluetoothGattCharacteristic.PROPERTY_READ | BluetoothGattCharacteristic.PROPERTY_INDICATE 19                 , BluetoothGattCharacteristic.PERMISSION_READ); 20         //add a descriptor 21         BluetoothGattDescriptor descriptor = new BluetoothGattDescriptor(BluetoothUUID.CLIENT_CHARACTERISTIC_CONFIG 22                 , BluetoothGattCharacteristic.PERMISSION_WRITE); 23         mCharacteristicRead.addDescriptor(descriptor); 24         service.addCharacteristic(mCharacteristicRead); 25  26         BluetoothGattCharacteristic write = new BluetoothGattCharacteristic( 27                 BluetoothUUID.writeDataUUID, 28                 BluetoothGattCharacteristic.PROPERTY_WRITE | BluetoothGattCharacteristic.PROPERTY_READ | BluetoothGattCharacteristic.PROPERTY_INDICATE, 29                 BluetoothGattCharacteristic.PERMISSION_WRITE); 30  31         service.addCharacteristic(write); 32  33         if (mGattServer != null && service != null) { 34             mGattServer.addService(service); 35             mGattServer.addService(service2); 36         } 37  38     } 39  40     //当添加一个GattService成功后会回调改接口。 41     public void onServiceAdded(int status, BluetoothGattService service) { 42         super.onServiceAdded(status, service); 43         if (status == BluetoothGatt.GATT_SUCCESS) { 44             Log.d(TAG, "onServiceAdded status=GATT_SUCCESS service=" + service.getUuid().toString()); 45         } else { 46             Log.d(TAG, "onServiceAdded status!=GATT_SUCCESS"); 47         } 48     } 49  50     //BLE设备连接状态发生改变后回调的接口 51     public void onConnectionStateChange(android.bluetooth.BluetoothDevice device, int status, 52                                         int newState) { 53         super.onConnectionStateChange(device, status, newState); 54         Log.e(TAG, String.format("1.onConnectionStateChange：device name = %s, address = %s" 55                 , device.getName(), device.getAddress())); 56         Log.d(TAG, "onConnectionStateChange status=" + status + "->" + newState); 57         if (newState == BluetoothProfile.STATE_DISCONNECTED) { 58             btClient = null; // 移除连接设备 59         } 60     } 61  62     //当有客户端来读数据时回调的接口 63  64     /** 65      * 特征被读取。当回复响应成功后，客户端会读取然后触发本方法,  66      */ 67     public void onCharacteristicReadRequest(android.bluetooth.BluetoothDevice device, 68                                             int requestId, int offset, BluetoothGattCharacteristic characteristic) { 69         super.onCharacteristicReadRequest(device, requestId, offset, characteristic); 70         characteristic.setValue(new byte[]{0x03, 0x01}); 71         Log.e(TAG, String.format("1.onCharacteristicReadRequest：device name = %s, address = %s" 72                 , device.getName(), device.getAddress())); 73         Log.e(TAG, String.format("onCharacteristicReadRequest：requestId = %s, offset = %s", requestId, offset)); 74         boolean result = mGattServer.sendResponse(device, requestId, BluetoothGatt.GATT_SUCCESS, offset, characteristic.getValue()); 75  76         Log.e(TAG, "read request send response:" + result); 77     } 78  79     //当有客户端来写数据时回调的接口 80  81     /** 82      * 接受具体数据字节 85      */ 86     @Override 87     public void onCharacteristicWriteRequest(android.bluetooth.BluetoothDevice device, 88                                              int requestId, BluetoothGattCharacteristic characteristic, boolean preparedWrite, 89                                              boolean responseNeeded, int offset, byte[] value) { 90         super.onCharacteristicWriteRequest(device, requestId, characteristic, preparedWrite, responseNeeded, offset, value); 91  92         mGattServer.sendResponse(device, requestId, BluetoothGatt.GATT_SUCCESS, offset, null); 93  94         // 处理其它设备写进来的数据 95         value.  // 处理数据 byte[] value，记住连接设备 96  97     } 98  99     //描述被写入时，在这里执行bluetoothGattServer.sendResponse(device, requestId, BluetoothGatt.GATT_SUCCESS...) 时，触发onCharacteristicWriteRequest100     @Override101     public void onDescriptorWriteRequest(BluetoothDevice device, int requestId, BluetoothGattDescriptor descriptor, boolean preparedWrite, boolean responseNeeded, int offset, byte[] value) {102         super.onDescriptorWriteRequest(device, requestId, descriptor, preparedWrite, responseNeeded, offset, value);103 104         Log.d(TAG, "onDescriptorWriteRequest:" + Arrays.toString(value));105         // now tell the connected device that this was all successfull106         mGattServer.sendResponse(device, requestId, BluetoothGatt.GATT_SUCCESS, offset, value);107     }108 109 }

 

android BLE Peripheral 做外设模拟设备，供ios、android 连接通讯。


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