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我用协调器以组播的形式发送消息，消息内容为数字9，终端节点接收到消息后怎样可以提取并读出这个数字呢？
终端设备会定期休眠，所以可能收不到组播消息，向终端发送消息建议使用单播
如果终端设备有收到组播，可以到afBuildMSGIncoming接收
