当有新的数据包被 socket 接收时，'message' 事件会被触发。msg 和 rinfo 会作为参数传递到该事件的处理函数中。
msg{Buffer} 消息。rinfo{Object} 远程地址信息。address{string} 发送方地址。family{string} 地址类型 ('IPv4'或'IPv6')。port{number} 发送者端口。size{number} 消息大小。
If the source address of the incoming packet is an IPv6 link-local
address, the interface name is added to the address. For
example, a packet received on the en0 interface might have the
address field set to 'fe80::2618:1234:ab11:3b9c%en0', where '%en0'
is the interface name as a zone ID suffix.
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