用于获取县级台站报文，合并报文处理，上传至上级网络中心。-Used to obtain county-level stations in the message, combined packet processing, uploaded to the higher level hub.

MAC层功能设计与实现代码，具体包括包接收、包发送、包处理等。-MAC layer functional design and implementation code, specifically including packet reception, packet transmission, packet processing.