Talker listener connection only works one way
http://wiki.ros.org/ROS/Tutorials/Mul...
I was following the above tutorial which is pretty simple. I have two computers one with ROS melodic and another with ROS kinetic. From my understanding that should not affect the results. When I run roscore on melodic and make it the listener I do not get any information from the kinetic computer running the talker.py file. However, when I run roscore and the listener.py file on melodic I get loads of information supposedly form the talker.py file even when I have yet to run it. Help?? The connection is good between both computers.
Difficulties getting things to work bidirectionally are almost always caused by not setting
ROS_IPor having a working DNS for all involved hosts.To test: set
ROS_IPon both computers to the IP of the respective computer. Then startroscoreand try running your scripts again.Note: you'll have to set
ROS_IPin each terminal again, unless you add it to your.bashrc(or similar shell configuration script).Please also note: there are many, many duplicates of this question here on this site.
I would recommend you try using Google:
your keywords here site:answers.ros.org.