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Posted: **Wed Jun 06, 2018 7:19 pm**

Hello everyone,
I want to use ROS to comunicate Simulink and three drones Crazyflie. I have some problems using ROS with the public wifi of the University, when I type

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`rosinit`

in MATLAB the error is:

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 `Cannot connect to ROS master at http://172.30.152.10:11311. Check the specified address or hostname.`

I tried also to run the command at home with the private wifi and there it works perfectly, what are the reasons and how can I solve it? I need to use ROS at University.

Thank you for your answers.

Posted: **Thu Jun 07, 2018 2:28 pm**

I found a solution: sharing the connection of an Android mobile phone connected to the public Wifi to my computer, and it works !!!

Posted: **Mon Jun 11, 2018 1:55 pm**

Thanks for sharing the solution!

Most public wifi will block communication between clients to help secure the network, this is most likely what is happening to you.

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ROS problem with MATLAB and public wifi

ROS problem with MATLAB and public wifi

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Re: ROS problem with MATLAB and public wifi