建立用户数据报UDP，通过udp发送飞机的位置姿态到服务器。特别地，把位置姿态数据类型转换为net类型，通过htonf、htonl等函数。(Set up the user datagram UDP and send the position of the aircraft to the server via UDP. In particular, the position attitude data type is converted to net type, through functions such as htonf, htonl and so on.)