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我有一个连接到 ble 设备的 android 应用程序。当按下设备上的按钮时，设备会向应用程序发送数据。有时应用程序和设备显示它们已连接，但是当我按下设备上的按钮时，没有数据传输到手机。为什么会发生这种情况，我该如何解决？