Dan,

Those are strange problems to have. A hunch I have is that nav_view has dropped its TCP connection to the robot for one reason or another on certain topics. This happens to us sometimes when we're switching between being connected to our robots over ethernet to wireless or when we lose connectivity to the robot for long periods of time. I'd be curious about a few things:

1) Can you get things to start displaying in nav_view by running the following command:
     rosrun topic_tools relay [missing_topic_name] [missing_topic_name]
    This will re-advertise the topic and cause nav_view to refresh its TCP connections.

2) Are you sure that the robot can connect to the machine that's running nav_view? Have you been running rostopic echo on the robot itself? Or on the local machine?

3) If you use rviz, do you see the same kind of problems. If this is a network issue, I'd expect you to see the same problems, but it'd be useful to know.

Hopefully this helps or we at least find out more about what's going on.

Hope all is well,

Eitan

On Fri, Apr 16, 2010 at 1:54 PM, Dan Lazewatsky <lazewatskyd@cse.wustl.edu> wrote:

Hi all -
We've been trying to get the nav stack running on one of our robots and
are having some frustrating and not totally reproducible problems. Nav
is setup from config files that I got working on an erratic and have
modified for this robot. When I start up nav_view after getting amcl,
move_base and the like going, most of the time I don't see any laser
scan, inflated obstacles etc. in nav_view and using Set Pose doesn't do
anything. move_base/local_costmap/obstacles is publishing data, and
rxgraph shows it connected to nav_view. When I use Set Pose, I can see
the message getting sent off, but the new pose is not reflected in
nav_view. Sometimes, I'll see the inflated obstacles in nav_view, but
once the map shows up they disappear.

Any help would be much appreciated,
-Dan
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