CSMA_CA

代码说明：

说明：  载波侦听多路访问。采用分布式控制方法，附接总线的各个结点通过竞争的方式，获得总线的使用权。只有获得使用权的结点才可以向总线发送信息帧，该信息帧将被附接总线的所有结点感知(Carrier Sense Multiple Access. A distributed control method, each attached to the bus node on a competitive basis, to obtain the right to use the bus. Only with the right to use the node can send messages to the bus frame, the message frame will be attached to all nodes sense the bus)