Cannot get read/write access to serial ports in QEMU emulator about android-serialport-api HOT 7 CLOSED

start a terminal or adb shell thing then do
su
cd dev
chmod 777 ttyHSUSB0

or ttyHSUSB1 or ttyMSM2 or whatever port you want.

this worked for me at least!

I did it in Xperia X10 mini..

For result:  Unable to chmod 777 tyyMSM2: operation not permitted

I am also dealing the same thing from android emulator...

I am trying to  controlling some hardware device (like RFID kit) from
Android Emulator which is installed in a PC...  But i am not getting
how to control the external hardware which is connected to PC  from
Android Emulator.... Can u help me on this topic??? Is it same doing
project under windows  and Linux??

I have written some code using android.hardware.usb package (which is
available in Android 3.1) ... but it is not detecting the hardware
devices attached over USB

[deleted comment]

I connect the physical device and run my application its gives the error
"Error: You do not have read/write permission to the serial port."

I know this is due to permisssion in my device .

I gave permission on emulator by using adb shell but how can i give on my real 
device? any idea please let me know.....................

For more information about rooting your phone, you should search on forums like 
xda-developers

Look at this answer:

http://stackoverflow.com/a/28504070/779408