Question

接收服务时，以下功能会尝试连接服务

@Override
public void uiAvailableServices(BluetoothGatt gatt, BluetoothDevice device, List<BluetoothGattService> services) {
     BluetoothGattCharacteristic c;
     BluetoothGattDescriptor d;


     c = gatt.getService(ForaBgGATTUUIDs.Service.SERVICE_SENSORS).getCharacteristic(ForaBgGATTUUIDs.Characteristic.CHARACTERISTIC_DATA);

     byte[] data = new byte[]{0x26};
     mBleWrapper.writeDataToCharacteristic(c, data);
     mBleWrapper.setNotificationForCharacteristic(c,true);
     mBleWrapper.requestCharacteristicValue(c);

 }

将数据写入特征

  public void writeDataToCharacteristic(final BluetoothGattCharacteristic ch, final byte[] dataToWrite) {

    if (mBluetoothAdapter == null || mBluetoothGatt == null || ch == null) {
      return;
    }

    // first set it locally....
    ch.setValue(dataToWrite);
    // ... and then "commit" changes to the peripheral
    mBluetoothGatt.writeCharacteristic(ch);
  }

启用描述符
的通知

 public void setNotificationForCharacteristic(BluetoothGattCharacteristic ch, boolean enabled) {
  if (mBluetoothAdapter == null || mBluetoothGatt == null) {
 return;
 }

  boolean success = mBluetoothGatt.setCharacteristicNotification(ch, enabled);
  if(!success) {
   Log.e("------", "Seting proper notification status for characteristic failed!");
  }

  // This is also sometimes required (e.g. for heart rate monitors) to enable notifications/indications
  // see: https://developer.bluetooth.org/gatt/descriptors/Pages/DescriptorViewer.aspx?u=org.bluetooth.descriptor.gatt.client_characteristic_configuration.xml
  BluetoothGattDescriptor descriptor = ch.getDescriptor(UUID.fromString("00002902-0000-1000-8000-00805f9b34fb"));
  if(descriptor != null) {
   byte[] val = enabled ? BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE : BluetoothGattDescriptor.DISABLE_NOTIFICATION_VALUE;
   descriptor.setValue(val);
   mBluetoothGatt.writeDescriptor(descriptor);
  }
}

请求数据

public void requestCharacteristicValue(BluetoothGattCharacteristic ch) {
Log.d(TAG, "requestCharacteristicValue");
  if (mBluetoothAdapter == null || mBluetoothGatt == null) {
return;
}

mBluetoothGatt.readCharacteristic(ch);

  // new value available will be notified in Callback Object
}

我期望它会在回调函数中执行上述操作后将结果发送给我，但在回调函数中它通常会告诉我已成功编写了特性。

无法在Android上使用BLE从血糖传感器中获取数据

0 个答案: