和其他建立在串口配置文件之上的配置文件一样，被更低层蓝牙通信协议实现的虚拟串行链接对使用DUN配置文件的应用程序是透明的。
Like other profiles built on top of the serial port profile, the virtual serial link created by the lower layers of the Bluetooth protocol stack is transparent to applications using the DUN profile.
并且这种方法不需要开发蓝牙底层协议，应用起来方便快捷，也可广泛应用在其他无线串行通信方面。
Furthermore this method doesn't need to develop the bottom protocol of bluetooth, can be used convenient, also can be used widely in other facets of wireless serial communication.
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