'message' 事件

当套接字上有新的数据报可用时，则会触发 'message' 事件。 事件句柄传入了两个参数：msg 和 rinfo。

• msg <Buffer> 消息。
• rinfo <Object> 远程地址信息。
  • address <string> 发送者地址。
  • family <string> 地址族（'IPv4' 或 'IPv6'）。
  • port <number> 发送者端口。
  • size <number> 消息大小。

如果传入数据包的源地址是 IPv6 链路本地地址，则将接口名称添加到 address。 例如，在 en0 接口上接收的数据包可能将地址字段设置为 'fe80::2618:1234:ab11:3b9c%en0'，其中 '%en0' 是作为区域 ID 后缀的接口名称。

The 'message' event is emitted when a new datagram is available on a socket. The event handler function is passed two arguments: msg and rinfo.

• msg <Buffer> The message.
• rinfo <Object> Remote address information.
  • address <string> The sender address.
  • family <string> The address family ('IPv4' or 'IPv6').
  • port <number> The sender port.
  • size <number> The message size.

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.