Unable to contact my own server

Question

Hello,

I have the following setup:

• Ros indigo

• -Laptop hosting a local wifi hotspot with IP 10.42.0.1. It is also connected to the internet via ethernet, but on a different network interface, so different (and unrelated IP).

• -Youbot that has joined the created hotspot (These are the only two
  things in that network). IP 10.42.0.20

• -SSH 'd into the Youbot on the mentioned Laptop.

• The .bashrc on the laptop has the following lines in it:

   export ROS_IP=10.42.0.1
   export ROS_MASTER_URI=http://10.42.0.1:11311
  

• The youbot sources the .bashrc on ssh login and it also contains

   export  ROS_IP=10.42.0.1 
   export  ROS_MASTER_URI=http://10.42.0.1:11311
  

What I can do:

• ping in either direction (always using the IP, never the hostname)
• Netcat in either direction
• Start roscore on the Laptop

What I cannot do:

• Start the youbot driver on the youbot. It always terminates with the "Unable to contact my own server at [http://10.42.0.1:35449/]" message. I feel like I've looked at a lot of tutorials and don't see what's wrong, but there obviously is something wrong. Can anybody tell me what please?

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Originally posted by RunOrVeith on ROS Answers with karma: 13 on 2016-06-14

Post score: 0

Answer 1

• Youbot that has joined the created hotspot (These are the only two things in that network). IP 10.42.0.20

...

The youbot sources the .bashrc on ssh login and it also contains

export  ROS_IP=10.42.0.1  

If this is not a typo, then that is your problem. You state that the youbot is at 10.42.0.20, but you set its ROS_IP to 10.42.0.1. That cannot work.

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Originally posted by gvdhoorn with karma: 86574 on 2016-06-14

This answer was ACCEPTED on the original site

Post score: 1

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Original comments

Comment by RunOrVeith on 2016-06-14:
Thanks, I thought ROS_IP was also supposed to be the IP that hosts roscore, but now that you mention it that doesn't really make sense!