In order to get rid of the error
you don't have +rw permission to access serial port
you need to add your user to the uucp group
> ls -l /dev/ttyS0
crw-rw---- 1 root uucp 4, 64 Nov 12 18:44 /dev/ttyS0
/usr/sbin/usermod -a -G uucp my_username
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