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2016-09-07 08:47:00 -0500	asked a question	A node failed to receive topic message from a remote computer node. I want to set up nodes between my robot os and my work pc. I set ROS_HOSTNAME=ros-dev.local on my robot os. `root@ros-dev:~/catkin_ws# hostname ros-dev root@ros-dev:~# ping qichunren-work.local PING qichunren-work.local (192.168.8.154) 56(84) bytes of data. 64 bytes from 192.168.8.154: icmp_seq=1 ttl=64 time=7.93 ms root@ros-dev:~/catkin_ws# cat /etc/hosts 127.0.0.1 ros-dev 127.0.0.1 localhost 192.168.8.157 qichunren-work` Then I start roscore: roscore & Then I start a node listener. On my work pc: ROS env: qichunren@qichunren-work:~/catkin_ws$ echo $ROS_IP qichunren@qichunren-work:~/catkin_ws$ echo $ROS_HOSTNAME ros-dev.local qichunren@qichunren-work:~/catkin_ws$ echo $ROS_MASTER_URI http://ros-dev.local:11311 qichunren@qichunren-work:~/catkin_ws$ hostname qichunren-work qichunren@qichunren-work:~/catkin_ws$ ping ros-dev.local PING ros-dev.local (192.168.8.220) 56(84) bytes of data. 64 bytes from ros-dev (192.168.8.220): icmp_seq=1 ttl=64 time=109 ms qichunren@qichunren-work:~/catkin_ws$ cat /etc/hosts 127.0.0.1 localhost 192.168.8.220 ros-dev And I ping each other both ok. I add env var into ~/.bashrc on my work pc: `export ROS_HOSTNAME=ros-dev.local export ROS_MASTER_URI=http://ros-dev.local:11311` I start a cmd_vel node on my work pc: `qichunren@qichunren-work:~/catkin_ws$ rosrun turtlesim turtle_teleop_key Reading from keyboard --------------------------- Use arrow keys to move the turtle.` But I can't send topic message to remote master node when I press up/down/left/right keys. Debug: On robot os: root@ros-dev:~# rosnode list /cmd_vel_listener_7800_1473279280207 /rosout /teleop_turtle root@ros-dev:~# rosnode info /cmd_vel_listener_7800_1473279280207 -------------------------------------------------------------------------------- Node [/cmd_vel_listener_7800_1473279280207] Publications: * /rosout [rosgraph_msgs/Log] Subscriptions: * /turtle1/cmd_vel [geometry_msgs/Twist] Services: * /cmd_vel_listener_7800_1473279280207/get_loggers * /cmd_vel_listener_7800_1473279280207/set_logger_level contacting node http://ros-dev.local:56815/ ... Pid: 7800 Connections: * topic: /rosout * to: /rosout * direction: outbound * transport: TCPROS root@ros-dev:~# rosnode info /teleop_turtle -------------------------------------------------------------------------------- Node [/teleop_turtle] Publications: * /turtle1/cmd_vel [geometry_msgs/Twist] * /rosout [rosgraph_msgs/Log] Subscriptions: None Services: * /teleop_turtle/get_loggers * /teleop_turtle/set_logger_level contacting node http://ros-dev.local:44188/ ... ERROR: Communication with node[http://ros-dev.local:44188/] failed! root@ros-dev:~# *I am confused why command rosnode info /teleop_turtle** show me the node ip host is ros-dev.local, while this node is lanuched on my work pc in fact.* On my work pc: qichunren@qichunren-work:~/catkin_ws/src/paigo_ros/paigo_apps$ rosnode list /cmd_vel_listener_7800_1473279280207 /rosout /teleop_turtle qichunren@qichunren-work:~/catkin_ws/src/paigo_ros/paigo_apps$ rosnode info /teleop_turtle -------------------------------------------------------------------------------- Node [/teleop_turtle] Publications: * /turtle1/cmd_vel [geometry_msgs/Twist] * /rosout [rosgraph_msgs/Log] Subscriptions: None Services: * /teleop_turtle/get_loggers * /teleop_turtle/set_logger_level contacting node http://ros-dev.local:44188/ ... ERROR: Communication with node[http://ros-dev.local:44188/] failed! I want to know why ros nodes bewteen two computer can't work. Thanks.