Sigma guitars serial numbers. Thank you for posting the additional information on the problem. Forcing reset using 1200bps open/close on port /dev/ttyACM0 PORTS. BS2: PC2 RESET disposition: dedicated RETRY pulse: SCK serial program mode. ![]() ![]() Hi all, I use turtlebot roomba with indigo version. I try to use robot_upstart package to run turtlebot_bringup minimal.launch from an upstrat: rosrun robot_upstart install --job turtlebot --interface wlan0 --user myuser --setup /home/myuser/turtlebot/devel/setup.bash --rosdistro indigo --master --logdir /home/myuser/.ros/log turtlebot_bringup/launch/minimal.launch All work properly except serial connection: Failed to open port /dev/ttyUSB0. Error: could not open port /dev/ttyUSB0: [Errno 13] Permission denied: '/dev/ttyUSB0' Please make sure the Create cable is plugged into the computer. 'myuser' is in the 'dialout' group. You control a space ship, with a frontal shooter and a charging cannon. If I start roslaunch turtlebot_bringup minimal.launch in a terminal it works. If I start sudo service turtlebot start it doesn't work. If I manually change port permission sudo chmod 777 /dev/ttyUSB0 service start without errors. Anyone having an idea what could be wrong? Thanks in advance. This is some additional clarification for what wrote. 'myuser' is in the 'dialout' group. That is normally all that is required, but robot_upstart works a bit different. From the: It’s important to understand how permissions work robot_upstart: • The upstart job invokes its jobname-start bash script as root. • The script sets up environment variables, and then uses setuidgid to execute roslaunch as an unprivileged user. This is by default the user who ran the install script, but it can also be specified explicitly via a flag. • The roslaunch which executes does not have its user’s group memberships. This means that it will not have access to serial ports with the dialout group, or locations in /var/log owned by root, etc. Any filesystem resources needed by your ROS nodes should be chowned to the same unprivileged user which will run ROS, or should set to world readable/writeable, for example using udev. So jobname-start starts out as user root, but then quickly drops all privileges and continues as a regular user (that is not a member of the dialout group). That is why some more configuration is required. I'm not a dev on this project, just a user so if anyone else wants to jump in please do: This is not an issue with the esp8266, and its not actually a bug at all, its just part of Linux. Its best practice to not change permissions in /dev unless as a last resort. What you want to do instead is to add yourself to the group which would give you permission to access the tty ports. To see the groups you are in simply type: groups To see all available groups type: compgen -g Most of them are self-explanatory, in this case you want to add yourself to either the tty group, or dialout, which you would do by: sudo usermod -a -G tty yourname Then your user should have access to tty without use of sudo.
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