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/* Here s a small IPv4 example: it asks for a portbase and a destination and starts sending packets to that destination. 这个IPv4版的例子：它要求portbase(本地端口)与destination （目的端口）然后发送消息 同时还监听消息。 例子测试一： 启动一个运行实例，本地地址与目标地址用同一个端口8888 例子测试二： 启动两个运行实例，本地地址与目标地址用不同的端口（它要求是偶数端口号） 两个实例互发 例子的中文解释都由hanyuejun添加，有任何疑问请发hanyuejun2006@163.com */-/* Here sa small IPv4 example: it asks for a portbase and a destination and starts sending packets to that destination. The IPv4 version of the example: It requires portbase (local port) and destination (destination port) and then send a message but also monitor the news . Examples of test 1: Start a running instance, a local address with the destination address port 8888 using the same test two examples: the two start to run instances, the local address and destination address with a different port (it requires the port number is even) two examples of inter- examples of explanation issued by the Chinese hanyuejun add, have any questi