协调器周期性地以广播的形式向终端节点发送数据（每个t秒广播一次），终端节点接受到数据后，是开发板的LED状态翻转，同时向协调器发送字符串“EndDEvice received! ”协调器接收到终端节点发送回的数据后，通过国串口输出到PC的串口调试助手。(The coordinator periodically in the form of broadcast to the terminal node to send data (broadcast once every T seconds), t