Ros2subscriber/receive Subscriber did not receive any messages and timed out.

Question

Isaiah Garcia-Romaine 2023-6-8

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1980304-ros2subscriber-receive-subscriber-did-not-receive-any-messages-and-timed-out

评论： haoyang 2024-8-16

Hello,

I am attempting to subcribe nodes on matlab to PX4 Autopilot topics. I am running PX4 software in the loop flying a simulated quadcopter, I can echo the ROS2 topics in linux terminal, so there is data being published. However when I attempt to subscribe using MATLAB I do not recieve any data. I am not sure what the issue is as I have almost completely followed examples where /chatter is the topic.

rosinit;

setenv("ROS_DOMAIN_ID","101");%I need this to not conflict with other ROS2

%networks/shouldn't be a problem because matlab can see the topics with ros2 topic list

node1 = ros2node('matlab');

node2 = ros2subscriber(node1,'/fmu/out/sensor_combined');

msg = receive(node2,10)

>> ros2sub

Error using ros2subscriber/receive

Subscriber did not receive any messages and timed out.

Error in ros2sub (line 7)

msg = receive(node2,10)

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Isaiah Garcia-Romaine 2023-6-9

Hi Sravan Pentlavelly,

Thank you for your response. It turns out that the issue is that default ROS subscribers are incompatible with PX4 publishers due to their different QoS settings. To fix the problem I used this MATLAB documentation: https://www.mathworks.com/help/ros/ug/manage-quality-of-service-policies-in-ros2.html

haoyang 2024-8-16

What kind of QoS settings do you use?

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Answer 1

Jagadeesh Konakalla 2023-6-12

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1980304-ros2subscriber-receive-subscriber-did-not-receive-any-messages-and-timed-out#answer_1254094

It turns out that the issue is that default ROS subscribers are incompatible with PX4 publishers due to their different QoS settings. To fix the problem I used this MATLAB documentation: https://www.mathworks.com/help/ros/ug/manage-quality-of-service-policies-in-ros2.html