添加signal连接的心跳检测, 在有防火墙网络中,可以防止signal连接被阻断,导至断开重连。#1334
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经过测试,signal连接和tunnel两条TCP连接都会变成活跃连连接,不会被防火墙认认为是空连接。使用tcpdump进行抓包。signal连接也会有一个4字节的数据由client发向server。两条连接在数据层可以保持活跃。