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系统说明
1. 蓝牙消息回调属于中断上下文
2. 定时器回调属于中断上下文
3. 简单的定时任务写在定时器回调中，不允许阻塞
4. 复杂的业务下载app_scheduler中
5. 定时通过app_scheduler push到app_main中
6.
