Ros topic echo doesn't show on multi-computer setting

edit

Is it related to this: https://answers.ros.org/question/371773/

Sadly no, because topics I send on the NodeComputer doesn't show up either on MasterComputer. Plus, the unanswered question deals with services, I am only trying to read and write on a topic for now.

There is no difference in services, messages or actions when it comes to networking setup. So anything you read about any of those applies to your problem as well.

I created 2 separated network, with MasterComputer acting as a gateway. I won't be able to put them all on the same network.

please provide much more information about your network setup. IPs, subnets, routers involved, is NAT enabled? What sort of network(s)? Etc.

At the very least bi-directional IP (TCP and perhaps even UDP) traffic between all involved hosts on both networks must be working. If that works, checking DNS settings and the various ROS_ environment variables on all hosts must be configured correctly.

I followed the tutorial on http://wiki.ros.org/ROS/Tutorials/Mul.... I tried setting up 3 computer running ROS

then please show what you configured on which host.

Network between RobotComputer and MasterComputer : ethernet LAN (just an ethernet cable between the 2 computers). IP adresses are 198.168.100.40 (RobotComputer) and 198.168.100.50 (MasterComputer). Net mask is 255.255.255.0 Both device ping each other.

Network between NodeComputer and MasterComputer : ethernet LAN (just an ethernet cable between the 2 computers). IP adresses are 10.0.0.2 (NodeComputer) and 10.0.0.1 (MasterComputer). Net mask is 255.255.255.0 Both device ping each other.

I exported ROS_MASTER_URI and ROS_IP and ROS_HOSTNAME Focusing on the "faulty" network : On NodeComputer,

ping 10.0.0.1
export ROS_MASTER_URI=http://10.0.0.1:11311/
export ROS_IP = 10.0.0.2
export ROS_HOSTNAME = 10.0.0.2