Cannot connect to ROS master running on mi PC from raspberry pi

ERROR: Unable to communicate with master!

I am using Matlab 2019B and I have installed Raspbian GNU/Linux 9 in mi Raspberry Pi 3 board. The thing is that I create a ros master on mi PC and I try to connect to it from my Raspberry pi and it gives mi this error.

PC ip : 192.162.1.21

Raspberry Pi IP = 192.162.1.38

To create Matlab master on mi pc I use:

rosinit('NodeHost','192.168.1.21')

then I open a communication terminal using :

r = raspberrypi('192.168.1.38','pi','raspberry');

openShell(r)

then trough this terminal I oppened I type:

$ source ~/catkin_ws/devel/setup.bash

$ export ROS_MASTER_URI=http://192.168.1.21:11311

$ rostopic echo /rosout

This las one is to subscribe to the topic /rosout that the matlab master creates when using rosinit.

This is when I get the error.

ERROR: Unable to communicate with master!

I thought it could be a firmware problem but when I ping mi rspberry from mi PC there is no problem and neither the other way.

I apreciated if anyone could help me

thanks in advance.

Answer 1

[Tohru Kikawada]

Please try to set the following environment variable on your Raspberry Pi as disscussed here.

$ export ROS_HOSTNAME=192.168.1.100 # Raspberry Pi's IP address. This should be reached from your PC