rostopic pub and YAML

If you having trouble figuring out how to encode arguments in YAML for rostopic pub, please see YAML command line for a detailed description and examples.

ERROR: Unable to communicate with master!


  • rostopic type foo
    ERROR: Unable to communicate with master!


  • Is your Master running? If no, please run roscore

  • Is your ROS_MASTER_URI set correctly? If no, please set the ROS_MASTER_URI tothe location of your Master.

  • Can you contact the address specified in the ROS_MASTER_URI?

    $ echo $ROS_MASTER_URI
    $ ping foo
    ping: unknown host foo

    If you get the "unknown host" error, please check your network settings or change the ROS_MASTER_URI to a resolvable address.

Wiki: rostopic/Troubleshooting (last edited 2009-12-31 21:22:42 by KenConley)