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[Resolved] Communication between Kinetic and Indigo only working one-way

asked 2019-01-22 16:28:00 -0500

manu-diaz-zapata gravatar image

updated 2019-01-23 11:20:37 -0500

I am currently trying to set a Master-Slave using my laptop (Ubuntu 16.04 w/ ROS Kinetic) as master and an UDOO Quad (Ubuntu 14.04.5 LTS (GNU/Linux 3.14.56-udooqdl-02044-gddaad11 armv7l) w/ ROS Indigo ARM) as a client and a router (TP-LINK TL-WR841N V7) to set the network for both devices.

I've already done all the steps given here, where I set the ROS_MASTER_URI to the IP on my PC. So far I can see topics via rostopic list either on my PC or via ssh on the UDOO.

The problem I have is that when I try a simple publisher node like rostopic pub \testing std_msgs\String hello, I can only get the message using rostopic echo \testing when I do it on the machine I am publishing from (even through ssh), I get nothing if I do it on the other machine.

I've read other questions like #q9915 and #q76279. I've tried to disable the firewall, set the ROS_HOSTNAME, but neither of those solutions worked for me.

My intuition says to me that it should not be a problem with the messages between the machines since I am only sending a String which is one of the basic std_msgs.

Could it be a networking problem? Could it be a compatibility problem since I am running Kinetic on one device and Indigo on the other?

Any help will be appreciated

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This sounds like a networking issue. I did a talk about network troubleshooting at ROSCon a few years back: .

ahendrix gravatar image ahendrix  ( 2019-01-22 19:30:37 -0500 )edit

If I have time I'll look into that dnsmasq setup for my lab, because it sounds like I will save us some hassle. I've already added on both machines the IP of the other on \etc\hosts. And the weird thing is that before I went home, I managed to listen from my PC to something published in the UDOO.

manu-diaz-zapata gravatar image manu-diaz-zapata  ( 2019-01-22 21:06:26 -0500 )edit

I think I'll try the rosnode info and see what debugging I can do from there.

manu-diaz-zapata gravatar image manu-diaz-zapata  ( 2019-01-22 21:07:34 -0500 )edit

1 Answer

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answered 2019-01-23 11:18:59 -0500

manu-diaz-zapata gravatar image

I just found the reason why it wasn't working. Just needed to give the IP of my PC on the WLAN to the ROS_IP environment variable on my PC. Once I disabled the firewall, everything worked as expected.

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I'm glad that you found the solution. I've accepted your answer. Now that you have enough karma, you should be able accept your own answer in the future.

tfoote gravatar image tfoote  ( 2019-01-24 18:57:10 -0500 )edit

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Asked: 2019-01-22 16:28:00 -0500

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Last updated: Jan 23 '19