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Current Scenario
The robot runs roscore and the laptop runs rosrun rviz rviz. On the laptop I'm able to see the camera footage from the robot just fine.
Question
I want to add another robot + camera to the equation. How can I make my laptop listen to the roscore's of each robot?
You can launch the roscore on your laptop (or any ROS device that stays connected during the experiment. it could be one of the robots) and then launch your two robots with roslaunch commands. If they are on the same network and you have correctly specified the ROS_MASTER_URI you should have no issues.
By default, the current version of ROS does not allow to have multiple ROS masters on the same network, but efforts have been made to implement this feature, you can have a look at the following packages :
This being said you might want to start working with a single master first and transition to multiple master only if needed. If you are working with a reliable network you probably don't need multiple masters.
Also, if you have multiple robots, make sure that you launch them in separate namespaces (e.g /robot1/,/robot2/ to avoid confusions and conflicts ...
I would really like to go with one master idea but I'm finding that the camera only streams if it's connect to a machine running roscore (aka a "master"). Is it possible to go the other way?
After I wrote the previous comment I thought I something I might be doing wrong. I made the change and now everything works as I wanted with only one master. The issue was that I have to specify my ROS_IP for each machine in the system.
dear jack I have been facing a similar problem. how can I specify my ROS_IP to have two devices working with one master?
Just make sure that each device has the environment variable ROS_IP set to its own unique IP on the network interface that you are using, and ROS_MASTER_URI set to the IP of the ROS master. http://wiki.ros.org/ROS/NetworkSetup
What al-dev said. Additional simplification: ROS_IP should be different for each device. ROS_MASTER_URI should be the same for each device.
Asked: 2016-04-09 17:41:28 -0500
Seen: 5,017 times
Last updated: Apr 09 '16
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excuse me i don't know the response. i want to ask you how laptop like node communicate on WiFi with Robot?
Read this http://wiki.ros.org/ROS/Tutorials/Mul... then this http://www.umiacs.umd.edu/~cteo/umd-e...