I’m troubling in connecting Simulink and Unreal Engine through ROS on WSL2.
I want to send some messages from Simulink to UE (ROS Integration) using ROS Topics, but the topics from Simulink cannot be subscribed. (Actually the topic itself is subscribed, but no message is coming.)
My environment is as follows:
MATLAB R2024a + ROS Toolbox
Unreal Engine 5.1.1 (+ ROS Integration)
Ubuntu 20.04 on WSL2
ROS Noetic
I have confirmed the ROS communications below:
Simulink to the same Simulink: succes
Simulink to the other Simulink on the same computer: partly success (✔A→B, while ✘B→A. I suspected that the same port cannot be used for both publishing and subscribing, but alternating their roles did not work.)
Simulink to ROS: failed (The topics can be found by rostopic list, but I couldn’t rostopic echo.)
Simulink to UE: failed
UE to ROS: success (only String messages)
UE to Simulink: success (only String messages)
Regarding to the rostopic list, the rosnode info /SimulinkSystem_xxxxx (the node created by Simulink) response says that the connection to the node is failed.
I searched for the similar issues on internet and it may be caused by that the hostname cannot be resolved by ROS.
I have tried to set the environment variables so that they are not "localhost" nor "127.0.0.1", but it did not work. (When doing it, I could not connect to the ROS master.)

Could anyone figure out what is the true problem(s), and how to solve it?
Thank youI’m troubling in connecting Simulink and Unreal Engine through ROS on WSL2.
I want to send some messages from Simulink to UE (ROS Integration) using ROS Topics, but the topics from Simulink cannot be subscribed. (Actually the topic itself is subscribed, but no message is coming.)
My environment is as follows:
MATLAB R2024a + ROS Toolbox
Unreal Engine 5.1.1 (+ ROS Integration)
Ubuntu 20.04 on WSL2
ROS Noetic
I have confirmed the ROS communications below:
Simulink to the same Simulink: succes
Simulink to the other Simulink on the same computer: partly success (✔A→B, while ✘B→A. I suspected that the same port cannot be used for both publishing and subscribing, but alternating their roles did not work.)
Simulink to ROS: failed (The topics can be found by rostopic list, but I couldn’t rostopic echo.)
Simulink to UE: failed
UE to ROS: success (only String messages)
UE to Simulink: success (only String messages)
Regarding to the rostopic list, the rosnode info /SimulinkSystem_xxxxx (the node created by Simulink) response says that the connection to the node is failed.
I searched for the similar issues on internet and it may be caused by that the hostname cannot be resolved by ROS.
I have tried to set the environment variables so that they are not "localhost" nor "127.0.0.1", but it did not work. (When doing it, I could not connect to the ROS master.)

Could anyone figure out what is the true problem(s), and how to solve it?
Thank you I’m troubling in connecting Simulink and Unreal Engine through ROS on WSL2.
I want to send some messages from Simulink to UE (ROS Integration) using ROS Topics, but the topics from Simulink cannot be subscribed. (Actually the topic itself is subscribed, but no message is coming.)
My environment is as follows:
MATLAB R2024a + ROS Toolbox
Unreal Engine 5.1.1 (+ ROS Integration)
Ubuntu 20.04 on WSL2
ROS Noetic
I have confirmed the ROS communications below:
Simulink to the same Simulink: succes
Simulink to the other Simulink on the same computer: partly success (✔A→B, while ✘B→A. I suspected that the same port cannot be used for both publishing and subscribing, but alternating their roles did not work.)
Simulink to ROS: failed (The topics can be found by rostopic list, but I couldn’t rostopic echo.)
Simulink to UE: failed
UE to ROS: success (only String messages)
UE to Simulink: success (only String messages)
Regarding to the rostopic list, the rosnode info /SimulinkSystem_xxxxx (the node created by Simulink) response says that the connection to the node is failed.
I searched for the similar issues on internet and it may be caused by that the hostname cannot be resolved by ROS.
I have tried to set the environment variables so that they are not "localhost" nor "127.0.0.1", but it did not work. (When doing it, I could not connect to the ROS master.)

Could anyone figure out what is the true problem(s), and how to solve it?
Thank you matlab, simulink, ros, wsl2, noetic MATLAB Answers — New Questions

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