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Hello, I have some code in my ros node (within a catkin workspace) that requires super user privilege in order to access some serial ports. How can this be done as sudo does not work with rosrun.
Thanks.
Edit: This is using the admin account:
$groups ros
ros : ros adm dialout cdrom sudo dip plugdev lpadmin sambashare
You should really not use sudo with rosrun. It leads to all sorts of nastiness with permissions.
For serial ports (and access to other hardware through /dev/xxx) you just need to give the relevant user (most likely your user) access to the device file (fi: /dev/ttyS0). This is not ROS specific.
See How do I allow a non-default user to use serial device ttyUSB0? on the Ubuntu stack-exchange for instance.
For ROS specific answers: google: linux serial ports udev access, which gives you:
Edit: and just for completeness (and for the lazy), a quote from the first answer to the question on the Ubuntu stack-exchange:
As you've noticed, the
/dev/ttyUSB0device has the group ofdialout. All you need to do is add the second user to thedialoutgroup:
sudo adduser USERNAME dialout
Note: you need to log out and back in for your user groups to be reloaded.
AFAIK the best way is to change (privilege) mode with udev rules, so that maybe every user can use this serial devices.
Asked: 2014-08-08 04:35:57 -0500
Seen: 5,075 times
Last updated: Aug 08 '14
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How about you try to open the ports in .bashrc file ?
How can this be done?