StevenCoral's profile - activity

Hi all, I have recently migrated from Kinetic and/or Indigo to Melodic, using Ubuntu 18.

My codes work fine but I keep getting the same message about a dozen times when launching a launch file:

XmbTextListToTextProperty result code -2

It repeats for about a dozen times after launching, but does not seem to effect the runtime. I just find it strange that this happens on 3 different computers with different launch files / nodes, and I can't find a thing on the internet.

Not sure which node causes this, I can check, but maybe someone here knows about a setting I might be able to change to get rid of this.

Blessings, Steve

Hi all,

Lets say I have a project involving Rviz and some display types, say, a PointCloud2 I'm listening to. If I wanted to change the cloud coloring, shpere size, or topic, for example, but through a command from within a node and/or an rqt gui incorporating Rviz, what would I be looking for? Is it dynamic reconfigure or are there more / other ways of doing so?

I'm just looking for a short pointing in the right direction, I would greatly appreciate it because I can't seem to find the correct keyword for this.

Many thanks, Steve

Recording only a single message instance Hi all, I need to save some metadata about my recording session (e.g. camera i

Recording only a single message instance Hi all, I need to save some metadata about my recording session (e.g. camera i

Hi Pals,

I've been using the latest velodyne package in order to receive data from the HDL-32E. I am using ubuntu 14.04.5 with a ROS indigo installation.

The driver mostly works fine, getting the desired 15Hz on a 900 RPM lidar rotation (and respectfully other Hz corresponding to other RPMs). This was checked via "rostopiz hz".

Using the Lidar on it's regular configuration generates ~50k points per frame, which is too much for me, especially considering I only need the front +-60 degrees (120 deg in total, which is a third of the whole 360 deg sweep). So I put that information into the corresponding slots inside the lidar's web GUI (you can choose the desired sweep angle), and I do get the desired sweep when I look in Rviz.

Now for the problem: I get the same amount of points per message, with the messages coming in at 1/3rd of the rate. The lidar is accumulating points for 3 revolutions and then publishing 1 message. Tests I've made show that this is probably a driver issue and not hardware. I found no parameter to change that might affect this behavior.

Here are some screenshots, with the Rviz, launch file, and velodyne web gui open.

Note that for full 360deg you get 15 fps, on a 120deg fan you get 5 fps (360/3->15/3), and on a 72deg fan you get 3 fps.

https://drive.google.com/open?id=1m0C.. .

https://drive.google.com/open?id=12B6.. .

https://drive.google.com/open?id=1qy8.. .

If anyone ever tried to limit the sweep before and get it to work, I'de love to hear.

Thanks in advance, Steve

EDIT: adding pics directly. Firefox gave me trouble for some reason

I have run into this myself but having the solutions not working I deemed it coincidental. I eventually found out the re

Getting the same warning on launch Hi all, I have recently migrated from Kinetic and/or Indigo to Melodic, using Ubuntu

Getting the same warning on launch Hi all, I have recently migrated from Kinetic and/or Indigo to Melodic, using Ubuntu

Rviz crashes on "ROS time moved backwards" Hi all, I am using ubuntu 14.04 with ros indigo. I am running rosbag play wit

gvdhoorn, I mean the my_configuraion.cfg file, which is placed inside my package folder instead of ~/.rviz Dyson spher

Rviz panel won't open Hi all, This might seem like a silly question but similar issues are probably shadowing my keywor

Rviz panel won't open Hi all, This might seem like a silly question but similar issues are probably shadowing my keywor

One time I did that and someone stated that I should write a comment instead... not really enough space for that. Thanks

Sorry to be answering my own question but I found the solution, and in the absence of other instructions I want to make

Sorry to be answering my own question but I found the solution, and in the absence of other instructions I want to make

Sorry to be answering my own question but I found the solution, and in the absence of other instructions I want to make

Sorry to be answering my own question but I found the solution (at least partially), and in the absence of other instruc

Sorry to be answering my own question but I found the solution (at least partially), and in the absence of other instruc

Astra Pro registered point cloud Hi all. I am using Ubuntu 16.04 with ROS kinetic. Fresh install with upgrades for both.

Hi all, I've been on this for hours now and I can't figure it out. It seems as if not this forum or the tutorials have a solution for this simple question. I have downloaded the Vesc stack here, without the vesc_ackerman package. It all builds nicely with the addition of the serial library, and even connects to the device and publishes topics stated in vesc_msgs. You can rostopic echo them, you can rosmsg list them (VescState and VescStateStamped). Now, what I am trying to do is to use these messages in another package, so that I can manipulate it.

I have a standard python node code, but it starts with: #import rospy, then #import VescState.msg (or from VescState import XXX) , and continues on (If any1 can point me on how to paste the code here without having only the first line as code format and everything else outside, plus hash-tags making the font huge, i'de love that...). I could go on but it doesnt really matter, because all I get when I try to run the code is:

Traceback (most recent call last):
  File "/home/tim/catkin_ws/src/vesc_comm/src/vesc_comm.py", line 5, in <module>
    from VescState.msg import *
ImportError: No module named VescState.msg

I have tried every conceivable way of doing this. i have tried to rename the message files, adding them as native messages to my package, including all the package.xml and cmakelists.txt additions just to make a sanity check. tried catkin_make install. none of it worked.

I actually do not want to make these messages native anyway. what I do want is to get my vesc_comm.py script to recognize the VescState.msg file from the other package (again - the messages work with the vesc_driver node and are listed in rosmsg!).

Why can I use every single message offered by ROS (std, geometry, pointcloud2...) but get the error stated above when I try and use a custom message?? my ROS is just not recognizing it. what am I doing wrong?

Thanks in advance, Steve

Sorry for the (very) late response. I will try to fcilitate the solution in your link. Thanks!