networking - [Android]: prevent USB device from sleeping when Android device sleeps -

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we making sip-related solution , requested compose app on customized android pad(4.4.*). unluckily, pad 3rd party , accordingly hardly further jobs on framework or driver...... on pad, lan port designed on usb , plan access network via lan. besides, no power key populated on cover.....

now question is: since pad sleeps, lan connection stopped soon. understand it's normal behavior android conducts. trying acquire known wake lock(partial or wifi lock) stop usb controller sleeping ... but, currently, little progress. there usb-related wake lock, wifi lock ?

i have solved problem perspective of hw .... not sure solution meaningful current topic. think sharing idea major goal of forum running.

a mos component added along power line controlling screen. manipulate connection/disconnection sending command mcu....

based on experiences , hard extend functionality on poor quality of pad ... poor post-sales support.......

hope it's helpful you.


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