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can anyone provide me qt android serial port open/read/write code? i got reply from some forum that i need to use java methods for serial port open and JNI. but i dont know how to do that.
Before trying JNI, take a look at the QtSerialPort module.
https://wiki.qt.io/Qt_Serial_Port
http://doc.qt.io/qt-5/qtserialport-module.html