现P2P的简单通信 包括心跳检测 掉线处理等功能-implement the communication between 2 peers-P2P communications is now a simple heartbeat dropped, including processing and other functions-implement the communication between 2 peers

带有心跳报文的程序 是模拟的 利用的是多线程 来进行模拟的 利用了定时器-Program with a simulated heartbeat packets using a multi-threaded to simulate the use of a timer