QSerialPort and android, permission error

[mrdebug]

Hi. My device has got many serial com ports. I have no problem to open the device ttyS0, when I try to open the device ttyUSB0 I obtain the error
"ttyUSB0" Error "Permission denied"
How can I resolve it?

[ovadi]

you have to use java to get permission. Then you can use ioctl functions on cpp side. I'm not sure that you can use QSerialPort after java part. If you can, please write here or mail to me pls.

[Kent-Dorfman]

This post is deleted!

[mrdebug]

Sorry can you explain? Have I to grant permission using java code before to try to use QSerialPort or are you saying that QSerialPort does not support Android 10?

[J.Hilk]

@mrdebug said in QSerialPort and android, permission error:

QSerialPort does not support Android 10

it never did.

Since you would need a rooted android device to access the port/api anyway, no-one ever bothered to make it an official supported part of the library (for Android)

You'll have to go native c++

[mrdebug]

Firstly an app that wants to use serial com ports on Android, seems that has to be run with
android:sharedUserId="android.uid.system"
after that, the QSerialPort object requires the right usev implementation and, my device Android 10 aosp does not have it.