It looks like you're on a pretty old release of our software stack (3.3.0-0.5), you should download the latest release (3.8.0-0.7) from our downloads page and we'll be better able to support issues that you're having since there's a good chance we've fixed them in the 10 months since the 0.5 release.

This is my PC (my_ros_env.sh)

This is my VOXL (my_ros_env.sh)

This is what I get when I try to show my voxl-env

Setting up environment variables for ROS is a little confusing for me.

I am using wifi to communicate with VOXL.
My VOXL IP is the usual 192.168.8.1
My PC IP is 192.168.8.78

I am stuck here.
Could someone please point me in the right direction?

Then, can you ping that IP from the computer you are trying to run Rviz?

$ ping <VOXL IP>

If so, on VOXL edit your ROS environment

export ROS_IP="<VOXL IP>"

Then start ROS on the VOXL. Monitor the output of the ROS master when it launches, you should see the "roscore" IP the same as what you just configured.

If so, configure the ROS environment on your PC

What is the IP of your PC on the same network as the VOXL? We'll call that <PC IP>

Configure the PC's ROS environment as such:

export ROS_MASTER_URI="http://<VOXL IP>:11311"
export ROS_IP="<PC IP>"

Then launch RViz

Note: The instructions above are configuring the master to be the VOXL by pointing both VOXL and the PC to the VOXL's IP address as master. Checkout slides 7,8,9 in the presentation here

You need to set your Ubuntu development environment with ROS to point to the ROS Master process on the VOXL.

Check out: https://answers.ros.org/question/35603/ros_master_uri-change-it-and-save-it/

So for example if the IP address of the VOXL is 192.168.1.118 then you need to execute export ROS_MASTER_URI=http://192.168.1.118:11311 on the Ubuntu system and then run rviz from the same terminal.

You then also need to run the MAVROS or MPA ROS Bridge on the VOXL along with the ROS master node.

Start ros master: roscore

mavros: https://docs.modalai.com/mavros/

On the voxl you need to edit the ROS_IP to match your voxl's IP address so that other hosts can connect to it.

If this doesn't work, consider examining your firewall on your ubuntu system to make sure it isn't block ROS traffic. If it's a vanilla ROS/Ubuntu install you should be fine.