Do local and remote machines have to run the same version of ROS ?

asked 2018-10-14 00:05:14 -0500

elpidiovaldez
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I just installed Ubuntu 18.04, and with it ROS Melodic Morenia on my workstation. I have a Raspberry Pi based bobot running Lubuntu 16.04 with ROS Kinetic Kame. Will these machines be able to communicate, or will I have to try and upgrade the Pi to 18.04 with Melodic too ?

I have already tried to make this work. The workstation sees topics being published on the Pi. However I see a raspicam_node on the Pi publishing at 10 hz on the Pi. When I check the rate of raspicam_node, on the workstation, rostopic says that no messages have been published. I need to determine if this is because the versions of ROS are incompatible, or if I am doing something else wrong.

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answered 2018-10-14 00:23:43 -0500

Hamid Didari

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As long as the specific messages have not been changed between the two ROS distributions it should be work fine maybe your ip address didn't set correctly

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Yes , from my experience , it works fairly well across different variants .

chrissunny94 ( 2018-10-15 00:11:16 -0500 )edit

I remember having huge problems with some marker messages when I was using a combo ROS Kinetic + ROS Indigo. I would highly recommend sticking to the same distro if possible

msadowski ( 2018-10-15 11:42:27 -0500 )edit

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answered 2018-10-15 12:36:39 -0500

KinWah
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I am new to ROS too and below are some of my experiences

1) Both workstation and the mobile robot can have different rosdistro. My current setup is Lunar + Kinect

2) Never forget to export the following three things in your terminal or ~/.bashrc. All the addresses below are for display purpose. It is different for everyone. In my case, without any one of them, the whole thing will not work.

#export ROS_MASTER_URI=http://192.168.1.118:11311/ (address displayed on workstation's roscore)
#export ROS_HOSTNAME=192.168.1.118 (address of master/slave)
#export ROS_IP=192.168.1.118 (address of master/slave)

3) Lastly, try synchronize time of both workstation and the mobile robot. For example, try sudo ntpdate 192.168.6.104 (Address of master) on your mobile robot either by ssh or ~/.bashrc

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Do local and remote machines have to run the same version of ROS ?

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Do local and remote machines have to run the same version of ROS ?