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Due to limited storage space, I would like to run my roscore and certain important packages in one system (A Jetson TX1 running ros indigo on ubuntu 14.04) and my subscriber packages in another. Both these systems are on the same router. I believe that Jetson is to be set up as a master/server and the other system should be a client. But how can I set these up?
If TX1 is the master, you should run roscore on it, and also some nodes that have to run on TX1. You need to know the IP address of TX1, say 192.168.1.10, and the roscore port number, say 11311.
And the other machine, your PC, for example, should also install ROS. Don't run roscore on your PC, just export ROS_MASTER_URI=http://192.168.1.10:11311. and then run the node directly.
I am trying to do the same where the TX1 is the master and my pc is the client. I want to subscribe to the ros topics from master. After the I followed the steps above, I can see the rostopics listed in my PC(Client). But when do the rostopic echo /topic name I cannot see any values printed. Can you kindly let me know if I am skipping any steps here? or how to receive the messages on the client side?
Thanks
Please do not post follow-up/related questions as answers on already answered questions (which in this case is also already almost 4 years old).
Post a new question instead.
But please also note: your question has been answered and discussed many times here on ROS Answers. Please use Google to find previous Q&As about this (append site:answers.ros.org to your query).
Asked: 2016-09-16 11:24:23 -0500
Seen: 3,842 times
Last updated: Aug 25 '20
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http://wiki.ros.org/ROS/NetworkSetup
Also know that you have to use RSA keys with SSH in ROS, because ROS uses a library for SSH support that doesn't support the newer algorithms. See http://answers.ros.org/question/41446... for more details.
And if you've already been SSH-ing between the hosts, you'll have to manually remove the keys from ~/.ssh/known_hosts (or remove the whole file) before using ssh again with the
-oHostKeyAlgorithms='ssh-rsa'flag.