1. func NewNetConn(raddr string, laddr ...string) (*net.UDPConn, error)
    2. func Send(addr string, data []byte, retry ...Retry) error
    3. func SendRecv(addr string, data []byte, receive int, retry ...Retry) ([]byte, error)
    4. func SendRecvPkgWithTimeout(addr string, data []byte, timeout time.Duration, retry ...Retry) ([]byte, error)
    1. 其中,方法用于创建标准库的net.UDPConn通信对象。
    2. *Pkg方法用于简便的简单包协议数据传输。