DA14580 ble芯片的睡眠代码， 广播 18 秒之后如果没有连接就停止广播进入浅度睡眠，通过按键唤醒，再次进行广播，也是 18 秒的时间。-DA14580 ble chip sleep code broadcast after 18 seconds if there is no connection to stop broadcasting into the light sleep, wake up via buttons, broadcast again, the time is 18