why i had published camera topic but I don't get any message?

ros-simulation / gazebo_ros_demos

Example robots and code for interfacing Gazebo with ROS

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why i had published camera topic but I don't get any message? #37

Open lemon5254 opened 4 years ago

lemon5254 commented 4 years ago

when i command "roslaunch rrbot_gazebo rrbot_world.launch" , "rostopic list" i got topic list like it. lemon@lemon-All-Series-Invalid-entry-length-16-Fixed-up-to-11: ~_001

but i command "rostopic echo " get "no messages received and simulated time is active." so i cannot see any thing on rviz lemon@lemon-All-Series-Invalid-entry-length-16-Fixed-up-to-11: ~_002

i got a error like this -home-lemon-simgaz_ws-src-gazebo_ros_demos-rrbot_gazebo-launch-rrbot_world launch http:--localhost:11311_003

how can i solve it???? PS. i use ros-kinetic and gazebo 7.0.0