no permission to read or write this serial port

[alisaya10]

hi dear i have the same issue too i do some stuff like bellow but still give me the no permission to read or write this serial port

i put this lines to androidManifest.xml
"
uses-permission android:name="android.things.permission.USE_PERIPHERAL_IO"
uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"
uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
"
get /system/xbin/su from command ( which su ) and put this to following code

async function example() {

    SerialPortAPI.setSuPath("/system/xbin/su");
    console.log("tp1")
   
    const serialPort = await SerialPortAPI.open("/dev/ttyS2", { baudRate: 38400 });

    // subscribe received data
    serialPort.onReceived(buff => {
        console.log(buff.toString('hex').toUpperCase());
    })

    

    // unsubscribe
    // sub.remove();

    // send data with hex format
    await serialPort.send('00FF');

    // close
    serlialPort.close();
}
example()

[bastengao]

May be you need a rooted device. I don't know.