Ros does not receive data from MATLAB publishing topics

I use ubuntu18.04 melodic ros and matlabR2021a.

My linux operate system IP is: 172.20.10.3

My windows operate system IP is: 172.20.10.11

First, in my linux operate system:

I set the

explore ROS_MASTER_URI = https://172.20.10.3:11311
explore ROS_HOST_NAME = 172.20.10.3
explore ROS_IP = 172.20.10.3

Then, I start the "roscore" in my linux.

Second, in my windows10 operate system:

I use the matlab and set

setenv('ROS_MASTER_URI','http://172.20.10.3:11311/')
setenv('ROS_HOSTNAME','172.20.10.11')
setenv('ROS_IP','172.20.10.11')
rosinit()

Then, in the matlab terminal, use

ros topic list

could see all the ros topic in the matlab terminal.

Then, I run the code in the matlab

chatterpub = rospublisher('/chatter',rostype.std_msgs_String)
chattermsg = rosmessage(chatterpub)
chattermsg.Data = 'hello world'
send(chatterpub,chattermsg)
pause(5)

in the ros terminal, i can see the topic '/chatter', when i use 'topic echo /chatter', the ros can't receive the data 'hello world'.

To sum up, i can see all the topic list and topic node in the matlab and ros, but ros can't receive the data from matlab.

How do i deal withe this problem?

Answer 1

[praguna manvi]

Hi @黄,

It seems you are unable to receive messages echoed from MATLAB using "rostopic." Here is a link to a useful discussion thread on a similar issue. You could troubleshoot by using regular "ping" in both directions and follow the detailed steps in the link below:

https://www.mathworks.com/matlabcentral/answers/466795-matlab-unable-to-receive-messages-of-a-custom-ros-message-type