一个很好用的串口类，包括同步、异步等多种调用机制。-a good use of Serial categories, including synchronous and asynchronous transfer mechanism other.

这份代码展示了如何使用串口发送手机短消息，里面涉及了串口通信、线程同步等内容。用户可以参考里面的SMS通信技术-This code shows how to use the serial port to send mobile phone text messaging, which involves a serial communication, thread synchronization and so on. Users can refer to the inside of SMS comm