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I am having the same issue. Can i get some assistance with it? pi@raspberrypi:~ $ ping hgos ping: hgos: Temporary failure in name resolution pi@raspberrypi:~ $ roslaunch turtlebot3_bringup turtlebot3_robot.launch ... logging to /home/pi/.ros/log/1bcb02d8-bb3b-11eb-bb5a-b827eb2ac6f9/roslaunch-raspberrypi-2210.log Checking log directory for disk usage. This may take awhile. Press Ctrl-C to interrupt Done checking log file disk usage. Usage is <1GB.

started roslaunch server http://192.168.1.3:45445/

SUMMARY

PARAMETERS * /rosdistro: kinetic * /rosversion: 1.12.14 * /turtlebot3_core/baud: 115200 * /turtlebot3_core/port: /dev/ttyACM0 * /turtlebot3_core/tf_prefix: * /turtlebot3_lds/frame_id: base_scan * /turtlebot3_lds/port: /dev/ttyUSB0

NODES / turtlebot3_core (rosserial_python/serial_node.py) turtlebot3_diagnostics (turtlebot3_bringup/turtlebot3_diagnostics) turtlebot3_lds (hls_lfcd_lds_driver/hlds_laser_publisher)

ERROR: unable to contact ROS master at [http://192.168.1.2:11311] The traceback for the exception was written to the log file