可以做为软件心跳包使用，定期向某一IP发送PING指令，用于保持连接，现实生活中解决了很多路由器只有硬件连接而无电脑连接时的掉线现象！（非常有用作者：13944902227）-Software can be used as heartbeat packets use IP to send regularly to a PING command to stay connected, in real life, only to solve a lot of router hardware to co