C#实现的短信猫发送，不需要第三方开发包，直接原始的AT命令代码！-C# implementation of SMS to send the cat does not need third-party development kits, AT commands directly to the original code!

C#实现串口控制GSM模块，读取并发送AT命令，控制GSM模块发送接收短信。-C# Serial control the GSM module, read and send AT commands to control the GSM module send and receive text messages.