video stream between multiple maschines

multiplemachines

asked 2012-05-07 04:44:27 -0600

dinamex
447 ●46 ●52 ●59

Hi There,

I'm working on a UAV which is equipped with a webcam. The webcam is running with the usb_cam package and it is working fine on the UAV Machine. Now I'm trying to send the image-data via wireless to the base station but I can't get the messages. I exported the Master to the UAV and can even see which topics are published there, but when I try rostopic hz /logitech_usb_webcam/image_raw I don't recieve any message.

Could that be a result of two different versions of ROS (UAV = diamondback / Base = electric) or is that a failure somewhere else? would be great to get some help.

Cheers

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answered 2012-05-07 05:21:33 -0600

michikarg
2108 ●19 ●37 ●52 http://hcai.in.tum.de/...

As Dan already said, you should check the ROS NetworkSetup.

In this case i assume that the error is caused by your /etc/hosts file. You should be aware that local entries in the /etc/hosts file overwrite entries of your DHCP server...

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Thanks for the quick response. I worked only with the IP's to set an alias in the /etc/hosts file was the solution.

dinamex ( 2012-05-07 05:51:53 -0600 )edit

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answered 2012-05-07 04:57:50 -0600

Dan Lazewatsky
9115 ●79 ●103 ●160 http://dan.lazewatsky.com/

This sounds like a network/ROS environment configuration issue. My first thought would be to make sure that on your UAV, ROS_IP is set to the externally accessible IP address of the UAV. Take a look at the NetworkSetup wiki page for more troubleshooting suggestions.

It's generally not a good idea to mix versions of ROS, though I doubt that is the cause of this particular problem.

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