APDE USB / OTG communication

but I getting wrecked a primitive polling of devices.
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Serial.list (this) [0]
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I put the library well, in manual mode, through dfx .
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-glv- wrote that he also did it on the phone. but he did not indicate which library he was using.I have provided an annotation and a direct link to the library that I used. in my previous post. but I do not understand this library is needed, or another.