基于主题的UDP广播通信，顶层程序只需要根据主题进行数据的发送,如100.1，接收程序只需要根据主题进行数据的接收，如100.*-Based on the subject of the UDP broadcast communications, only the top-level procedures necessary to carry out under the topic of data transmission, such as 100.1, receiving only data required under the subject of the reception, such as 100 .*