Okay-- it turns out that gmapping cannot run at the same time as
p2os_driver -- it's not the installation of other packages that was a
problem, but rather, running them simultaneously.
So, now, with p2os nodes killed, gmapping works with the test data
set. (basic_localization_stage.bag). Now, however, I've recorded a
bagfile of my robot (using rosbag record /scan /tf), and I tried to
run gmapping with that -- gmapping outputs nothing, in this case. When
I 'rosbag play' the test bagfile, the gmapping node outputs messages,
saying it is receiving data -- but it doesn't do so with my generated
bagfile (and to confirm that nothing is happening, rosrun map_server
map_saver outputs nothing).

Thx,
Rishi


Rishi Bedi
rbedi100@gmail.com



On Wed, Jul 21, 2010 at 10:30 AM, Rishi Bedi <rbedi100@gmail.com> wrote:
> Thanks for your help -- writing to a bagfile works now --- I set it to
> record right into my home directory to take care of any permissions
> problems.
> I still can't get gmapping to generate a map from a bagfile, though.
> That too worked last week, before p2os_teleop. Now, when I run "rosbag
> play <filename>" in conjunction with "rosrun gmapping slam_gmapping
> scan:=scan" (or base_scan, if I'm using the downloaded bag file), this
> error message is repeatedly displayed:
>
> "[ WARN] [WallTime: 1279722421.991972640]:
> TF_OLD_DATA ignoring data from the past for frame /base_link at time
> 1.27972e+09 according to authority /play_1279722419677246299
> Possible reasons are listed at " <-- it doesn't display where these
> possible reasons are listed.
>
> Thanks again,
> Rishi
>
> Rishi Bedi
> rbedi100@gmail.com
>
>
>
> On Tue, Jul 20, 2010 at 1:36 PM, David Feil-Seifer
> <david.feilseifer@gmail.com> wrote:
>> p2os_teleop should not interfere with writing to a bagfile. Make sure
>> that you have write permissions for the directory where the bagfile
>> will be written, (this is not always the current directory, sometimes
>> it is /opt/ros/ros or ~/ros/ros whereever the ros installation was
>> done).
>>
>> On Tue, Jul 20, 2010 at 10:32 AM, Rishi Bedi <rbedi100@gmail.com> wrote:
>>> Ya, I did that.
>>> It may have something to do with the p2os_teleop package that I am
>>> using -- could they be interfering? I installed the teleop package
>>> after gmapping worked for me last Friday... so that's probably it...
>>> any ideas on interference between the two?
>>> Thanks
>>> Rishi
>>>
>>>
>>> Rishi Bedi
>>> rbedi100@gmail.com
>>>
>>>
>>>
>>> On Tue, Jul 20, 2010 at 12:30 PM, Brian Gerkey <gerkey@willowgarage.com> wrote:
>>>> hi Rishi,
>>>>
>>>> I just ran through that tutorial, downloading the linked bag, and it
>>>> works fine for me.  Did you set the use_sim_time parameter (step 4)
>>>> before starting gmapping (step 5)?
>>>>
>>>>        brian.
>>>>
>>>> On Tue, Jul 20, 2010 at 8:08 AM, Rishi Bedi <rbedi100@gmail.com> wrote:
>>>>> Hi,
>>>>> I'm trying to run the gmapping package, following the tutorial here:
>>>>> http://www.ros.org/wiki/slam_gmapping/Tutorials/MappingFromLoggedData
>>>>> .
>>>>> I'm getting errors at a few points along the way, however -- when I
>>>>> try to record my own bagfile from my Pioneer 2 (which I am
>>>>> teleoperating using a joystick), I repeatedly get this error:
>>>>> "[FATAL] [WallTime: 1279638142.894919030]: rosrecord::Record: could
>>>>> not write to file.  Check permissions and diskspace" My diskspace is
>>>>> definitely enough -- what permissions is it alluding to?
>>>>>
>>>>> I then tried just using the bagfile linked to in the tutorial, but
>>>>> gmapping outputs the following, repeatedly: "[ WARN] [WallTime:
>>>>> 1279638187.366396181]: TF_OLD_DATA ignoring data from the past for
>>>>> frame /base_link at time 126.2 according to authority
>>>>> /play_1279638095646529424". Using rosbag play to play the bagfile
>>>>> appears to be working, but it shows this:
>>>>> "RUNNING]  Bag Time:     35.500164   Duration: 0.900164 /
>>>>> 1239670987.745222   " <-- it's counting by 1/10, so that looks too
>>>>> big... it would take a while to count to that!
>>>>>
>>>>> Thanks,
>>>>> Rishi
>>>>>
>>>>> Rishi Bedi
>>>>> rbedi100@gmail.com
>>>>> _______________________________________________
>>>>> ros-users mailing list
>>>>> ros-users@code.ros.org
>>>>> https://code.ros.org/mailman/listinfo/ros-users
>>>>>
>>>> _______________________________________________
>>>> ros-users mailing list
>>>> ros-users@code.ros.org
>>>> https://code.ros.org/mailman/listinfo/ros-users
>>>>
>>> _______________________________________________
>>> ros-users mailing list
>>> ros-users@code.ros.org
>>> https://code.ros.org/mailman/listinfo/ros-users
>>>
>> _______________________________________________
>> ros-users mailing list
>> ros-users@code.ros.org
>> https://code.ros.org/mailman/listinfo/ros-users
>>
>