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    java.lang.ClassCastException: java.lang.String cannot be cast to com.example.demoapp.device.Dev
        at com.example.demoapp.MainActivity$MyHandler.handleMessage(MainActivity.java:177)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:137)
        at android.app.ActivityThread.main(ActivityThread.java:5140)
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