[ros-users] Wifi communication getting slow

[Dan Lazewatsky]

Hi Steven -
I've noticed similar problems on a few of our robots, mainly when using
image_transport to send video over wifi. To figure out if wifi is the
problem, there are two things I've found helpful: before starting any of the
code running, from your workstation, ping the robot and see if the ping time
increases. The other thing you can try is watching iwconfig on the robot to
see if the link quality deteriorates over time.

Unfortunately, I never really figured out what was going on. Replacing the
wifi cards in the affected computers seemed to solve the problem.

-Dan

On Tue, Jan 4, 2011 at 9:15 AM, Steven Bellens <
steven.bellens at mech.kuleuven.be> wrote:

> Hi,
>
> when using ROS to command a mobile base, I'm running a hokuyo_node and
> an orocos component node on the mobile base. On my workstation I have
> the navigation stack running, which gets laserscan data from the
> hokuyo node and sends velocity commands to the orocos component. I
> only switched to use the wireless network recently and noticed that,
> after running the app for some minutes, it looks like some delay
> starts to build up: when I drive the robot with the teleop_keyboard,
> after 2 minutes, it starts reacting very slow on my input commands.
> What's the best way to determine if the Wifi is indeed the problem
> and, if so, can I run this more optimally with ROS considering this
> restriction?
>
> regards,
>
> Steven
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