cannot publish cmd_vel messages
Hi all,
Just a brief question. Although there are many tutorials on how to set up the network configuration, nothing helped so I post the answer anyway. I have a robot that runs the roscore and the hardware related nodes (motion drivers, sensors etc) and a remote pc where I perform the motion planning on. I able to echo all the topic from my remote machine but on the robot I can only echo the topics published on the robot itself.
Example: I have a /cmd_vel subscriber on the robot. If I run the-robot~$ rostopic pub /cmd_vel geometry_msgs/Twist '[0.1, 0, 0]' '[0,0,0]' the robot start to move (and from both machine I can see the message with rostopic echo /cmd_vel. If
I run the same command on the remote laptop the robot doesn't move and the topic is seen only on the remote machine.
I exported ROS_MASTER_URI, ROS_HOSTNAME on the robot and ROS_MASTER_URI on the laptop. I can ping correctly the robot from the remote laptop and viceversa. The netcat thing exposed in the tutorial is also working fine. I tried to set ROS_IP=192.168.0.101 on the
robot too (instead of ROS_HOSTNAME) but no improvements.
I also tried to set either ROS_HOSTNAME or ROS_IP on the remote machine but the communication from laptop to
robot still doesn't work. Furthermore in this last case I cannot launch files from the remote machine.
Is my configuration wrong. I'm using ROS groovy on the robot and ROS Hydro on the laptop. Anyway, I have the same issure using ROS groovy on both machines.
I've also exported the the host names in /etc/hosts (by the way the same configuration I made on my PC works on the PC next to me).
Any suggestion?
Federico
