我正在开发两个应用程序外围和一个核心角色。
周边
2特征:
ý
private void addServiceToGattServer() {
Service = new BluetoothGattService(
UUID.fromString(CostantUUID.xxx),
BluetoothGattService.SERVICE_TYPE_PRIMARY);
paperino = new BluetoothGattCharacteristic(
UUID.fromString(CostantUUID.xxx),
BluetoothGattCharacteristic.PROPERTY_NOTIFY|BluetoothGattCharacteristic.PROPERTY_READ,BluetoothGattCharacteristic.PERMISSION_READ);
clientCharacteristiConfiguration = new BluetoothGattDescriptor(UUID.fromString(CostantUUID.clientCharacteristiConfiguration), BluetoothGattDescriptor.PERMISSION_WRITE);
paperino.addDescriptor(clientCharacteristiConfiguration);
Service.addCharacteristic(paperino);
pippo = new BluetoothGattCharacteristic(
UUID.fromString(CostantUUID.userCommands),
BluetoothGattCharacteristic.PROPERTY_WRITE_NO_RESPONSE ,
BluetoothGattCharacteristic.PERMISSION_WRITE);
ebikeService.addCharacteristic(pippo);
mGattServer.addService(Service);
}
@Override
public void onDescriptorWriteRequest(BluetoothDevice device, int requestId, BluetoothGattDescriptor descriptor, boolean preparedWrite, boolean responseNeeded, int offset, byte[] value)
{
if(responseNeeded)
mGattServer.sendResponse(device, requestId, BluetoothGatt.GATT_SUCCESS, offset, value);
................
...............
paperino.setValue(payload);
mGattServer.notifyCharacteristicChanged(device,paperino, false);
}
客户端
我已经使setCharacteristicNotification变得简单,并为特色Paperino写了一个描述符:
bluetoothGatt.setCharacteristicNotification(characteristic, true);
/**
* @author I
* I abilitate the cliatcharacteristicconfiguration descriptor
*/
BluetoothGattDescriptor descriptor = characteristic.getDescriptor(UUID.fromString(CostantUUid.clientCharacteristiConfiguration));
if(descriptor != null)
{
descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
bluetoothGatt.writeDescriptor(descriptor);
}
通过这种方式,所有功能都能正常工作,但我想知道:在externall端添加描述符并从客户端写入它真的是必要的吗?
我试图不使用它并且它不起作用。但是在互联网上,教程永远不会写出描述符......
什么是真的?
此外,如果我做第一个notifyCharacteristicChanged(device,paperino,false);在onConnectionStateChange回调中
@Override
public void onConnectionStateChange(final BluetoothDevice device,
int status, int newState) {
super.onConnectionStateChange(device, status, newState);
Log.d(TAG, "onConnectionStateChange status=" + status + "->"
+ newState);
message=myHandler.obtainMessage();
if(newState == BluetoothProfile.STATE_CONNECTED)
{
disconnected=false;
Bundle f=new Bundle();
f.putString("connectionStatus", (String)(Utils.getStateDescription(newState)));
message.setData(f);
myHandler.sendMessage(message);
connectedDevice=device;
paperino.setValue(examplemsg);
mGattServer.notifyCharacteristicChanged(device, paperino,false);
}
在服务器端通知" examplemessage"没有到达客户端。我必须第一次调用onDescriptorWrite中的notifyCharacteristicChanged ...
调用notifycharacteristicChanged可能为时尚早?
答案 0 :(得分:3)
您必须写入描述符,它是蓝牙规范的一部分。 iOS实现抽象出来为您提供帮助。然而,Android实现需要手动写入描述符。
我认为我之前写的这个答案仍然适用:Any way to implement BLE notifications in Android-L preview