[ros-users] Navigation stack not working

[Prasad Dixit]

Thank you Brian, Eitan, Eric for helping me out.

some updates i observed while testing further:

1. It is now taking 4000 X 4000 sized map properly, initially it takes lot
of time to load the entire stack. Here, I saw weired behavior, like, this
time i again changed update_frequency to 1 and publish_frequency to 0 which
worked absolutely fine. This did not work for me last time. 

2. As per your remarks - yes, its taking some time to load AMCL and MAP all
together but after that it works smoothly.
It shows some messages at start after map load but then later it stops
giving those, may be since i have set publish_frequency to 0.

 ********
[ WARN] [1285046609.189924589]: Costmap2DROS transform timeout. Current
time: 1285046609.1898, global_pose stamp: 1285046608.8674, tolerance: 0.3000
[ WARN] [1285046609.690016886]: Costmap2DROS transform timeout. Current
time: 1285046609.6899, global_pose stamp: 1285046609.3679, tolerance: 0.3000
[ WARN] [1285046609.789254073]: Costmap2DROS transform timeout. Current
time: 1285046609.7891, global_pose stamp: 1285046609.3679, tolerance: 0.3000
[ WARN] [1285046609.890064495]: Costmap2DROS transform timeout. Current
time: 1285046609.8899, global_pose stamp: 1285046609.3679, tolerance: 0.3000
[ WARN] [1285046609.999240402]: Costmap2DROS transform timeout. Current
time: 1285046609.9991, global_pose stamp: 1285046609.5634, tolerance: 0.3000
[ WARN] [1285046797.412466274]: Costmap2DROS transform timeout. Current
time: 1285046797.4123, global_pose stamp: 1285046797.1032, tolerance: 0.3000
[ WARN] [1285046797.490019288]: Costmap2DROS transform timeout. Current
time: 1285046797.4899, global_pose stamp: 1285046797.1032, tolerance: 0.3000
[ WARN] [1285046797.589259643]: Costmap2DROS transform timeout. Current
time: 1285046797.5891, global_pose stamp: 1285046797.1032, tolerance: 0.3000
[ WARN] [1285046797.690021824]: Costmap2DROS transform timeout. Current
time: 1285046797.6899, global_pose stamp: 1285046797.1032, tolerance: 0.3000
[ WARN] [1285046582.296975123]: Map update loop missed its desired rate of
5.0000Hz... the loop actually took 5.7582 seconds
[ WARN] [1285046582.297395444]: Costmap2DROS transform timeout. Current
time: 12
*********
Can i solve this slow behavior after updating hardware?

3. Brian: I am using 0.1.4-33 Navigation stack. Am i suppose to try some new
experimental stack?

4. My tf_monitor gives me the output as below
Node: /amcl 10.0502 Hz, Average Delay: -0.0153442 Max Delay: 0.145252 <==
which is in negative
Node: /eskorta_odom 22.022 Hz, Average Delay: 0.000921226 Max Delay:
0.0214084
Node: /eskorta_state 30.0514 Hz, Average Delay: 0.0180185 Max Delay:
0.0565425
Is it fine to have negative delay? -  i am not able to figure it out since
this is my pre-hardware testing. 

5. I also saw your conversation about unknown_cost_value which is quite
useful for user like me. Just extending this conversation bit i want to know
(I had raised this question sometime back in some other thread also) -- 
In case we have a stair case scenario where we want to avoid robot to go and
to get fall down. We also can not put any obstruction in between..so can we
take the advantage of voxel grid's behavior of showing obstacle as an
unknown space. Can we plan to treat stair case start as an unknown space
while mapping itself (by not throwing laser on wall behind stair case)? so
as, for future reference robot will  always treat it is as unknown space
(obstacle) and will not traverse there.

Please let me know if you have any expert views on my questions

- Prasad

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