Android usb bulkTransfer - device doesn't receive whole data -


i try receive data usb scanner. use bulktransfer. code :

byte[] receivedtag = connector.receive(312);                         string tag = null;                         if (receivedtag != null) {                             long tagvalue = bytebuffer.wrap(receivedtag).getlong();                             tag = long.tohexstring(tagvalue);                             if (tag.contains("daad046f62ada900")) {                                 toast.maketext(getcontext(), "koniec skanowania" + tag, toast.length_short).show();                             } else if (!tag.contains("daad046f62ada900")) {                                 string tag2 = bytestohex(receivedtag);                                 string[]times = tag2.split("da ad 0a 6f 73");                                 log.e(tag, "onclick: " + times[0]);                                 toast.maketext(getcontext(), "" + tag2, toast.length_short).show();                         }

it works part of data. example - device sends byte array :

 string worktime =             "da ad 0a 6f 73 00 00 00 00 00 00 44 a4 " +             "da ad 0a 6f 73 01 00 00 00 00 00 45 75 " +             "da ad 0a 6f 73 02 00 00 00 00 00 45 46 " +             "da ad 0a 6f 73 03 00 00 00 00 00 44 97 " +             "da ad 0a 6f 73 04 00 00 00 00 00 45 20  " +             "da ad 0a 6f 73 05 00 00 00 00 00 44 f1 " +             "da ad 0a 6f 73 06 00 00 00 00 00 44 c2 " +             "da ad 0a 6f 73 07 00 00 00 00 00 45 13  " +             "da ad 0a 6f 73 08 00 00 00 00 00 45 ec  " +             "da ad 0a 6f 73 09 00 00 00 00 00 44 3d " +             "da ad 0a 6f 73 0a 00 00 00 00 00 44 0e " +             "da ad 0a 6f 73 0b 00 00 00 00 00 45 df " +             "da ad 0a 6f 73 0c 00 00 00 00 00 44 68 " +             "da ad 0a 6f 73 0d 00 00 00 00 00 45 b9 " +             "da ad 0a 6f 73 0e 00 00 00 00 00 45 8a" +             "da ad 0a 6f 73 0f 00 00 00 00 00 44 5b" +             "da ad 0a 6f 73 10 00 00 00 00 00 46 34" +             "da ad 0a 6f 73 11 00 00 00 00 00 47 e5" +             "da ad 0a 6f 73 12 00 00 00 00 00 47 d6" +             "da ad 0a 6f 73 13 00 00 00 00 00 46 07" +             "da ad 0a 6f 73 14 00 00 00 00 00 47 b0" +             "da ad 0a 6f 73 15 00 00 00 00 00 46 61" +             "da ad 0a 6f 73 16 00 00 00 00 00 46 52" +             "da ad 0a 6f 73 17 00 00 00 00 00 47 83 "             ;

but receive :

string worktime =                 "da ad 0a 6f 73 00 00 00 00 00 00 44 a4 " +                 "da ad 0a 6f 73 01 00 00 00 00 00 45 75 " +                 "da ad 0a 6f 73 02 00 00 00 00 00 45 46 " +                 "da ad 0a 6f 73 03 00 00 00 00 00 44 97 " +                 "da ad 0a 6f 73 04 00 00 00 00 00 45 20  " +                 "da ad 0a 6f 73 05 00 00 00 00 00 44 f1 " +                 "da ad 0a 6f 73 06 00 00 00 00 00 44 c2 " +                 "da ad 0a 6f 73 07 00 00 00 00 00 45 13  " +                 "da ad 0a 6f 73 08 00 00 00 00 00 45 ec  " +                 "da ad 0a 6f 73 09 00 00 00 00 00 44 3d " +                 "da ad 0a 6f 73 0a 00 00 00 00 00 44 0e " +                 "da ad 0a 6f 73 0b 00 00 00 00 00 45 df " +                 "da ad 0a 6f 73 0c 00 00 00 00 00 44 68 " +                 "da ad 0a 6f 73 0d 00 00 00 00 00 45 b9 " +                 "da ad 0a 6f 73 0e 00 00 00 00 00 45 8a" +                 "da ad 0a 6f 73 0f 00 00 00 00 00 44 5b" +                 "da ad 0a 6f 73 10 00 00 00 00 00 46 34" +                 "da ad 0a 6f 73 11 00 00 00 00 00 47 e5" +                 "da ad 0a 6f 73 12 00 00 00 00 00 47 d6" +                 "da ad 0a 6f 73 13 00 00 00 00 00 00 00" +                 "00 00 00 00 00 00 00 00 00 00 00 00 00" +                 "00 00 00 00 00 00 00 00 00 00 00 00 00" +                 "00 00 00 00 00 00 00 00 00 00 00 00 00" +                 "00 00 00 00 00 00 00 00 00 00 00 00 00 "                 ;

as can see , last bytes 00 . know why ? wrong buffer ?


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