Rosewood's profile - activity

Hello everybody! I have problem with gmapping and rviz. I want to create a map of my gazebo world. Gazebo is using sim time, so I set the same for rviz. The laser scanner in rviz and gmapping say

Message removed because it is too old (frame=[laser_back], stamp=[14337.420000000])

When I pause the gazebo-simulation and press reset in rviz, the error disappears, but actually when I continue the gazebo-simulation it is the same. The time during the error message is the same as the shown ROS time in rviz and the sim time in gazebo. While running gmapping there is no tf_static (after tf static_transform_publisher). What is wrong?

I have another question. I can view the image of my topic compressed_image/compressed on rviz, but not on android teleop. The teleop subscribes to compressed_image. What can I do to make it runnable for android?

Hello Everybody! I want to crosscompile ROS Packages for my Raspberry PI. I have an Ubuntu 14.04 with Indigo and Rasbian with Indigo. On my host system I've installed a toolchain and the boost libraries for arm and written a toolchain.cmake file. The normal crosscompiling is working (using a simple program with boost). Now my question is, how to realize the ROS part. My idea was just to copy the lib and the roscpp folder from the pi and replace it, but the PI says, that he can't execute the binary. Unfortunately the eros package is obsolete and I haven't found a description that worked for me.

First of all: it worked after deleting the build and devel folders. Thank you so much! I've tried to get an image on my android teleop app, but it's not working atm. So far, I don't understand the basic topics in image_transport. Could you give an example? It sounds nice.

According to rqt and rosnode info the node has subscribed. I'm starting with rosrun. How would you normally get data from image_raw/compressed, respectively from the UINt8[]. And ignore the "%s"..copied from another command :), but thanks for the hint.

The subscribed topic is image_raw/compressed and the output is the data array (see above). The data of my output topic is empty. Rqt says, that my talker node has subscribed for the topic. I think the problem is, that UInt8[] data is a stream.

Thanks cyborg, but he's still not sending data. When I do rostopic echo/image_raw/compressed, the output is data: [255, 216, 255, 224, 0, 16, .... (never ending story) and there is no rosout "test"

Hello everybody! I'm trying to read the datas of the "sensor_msgs/CompressedImage" message in a c++ program. Therefore I want to read the uint8[] data array. While using the callback function, nothing is happening (e.g. using ROS_INFO, when there is activity). When I'm watching the /image_raw/compressed topic, the data array is infinit. That's why I can't predefine an arraysize. Is there any possibility to get the data into a c++ code to read it separatly? Thanks

   // ROS ///////////////////////////////////////////
 ros::init(argc, argv, "talker_camera_eye");
ROS_INFO("%s", "start");
    ros::NodeHandle n;
   ros::Subscriber translation_sub = n.subscribe("wc_backdrive/camera_eye/image_raw/compressed", 1000, translateCallback);
ros::Publisher translation_pub = n.advertise<sensor_msgs::CompressedImage>("compressed_image", 1000);
  while (ros::ok())
  { 
translation_pub.publish(testmsg);
ros::spinOnce();
  }
  return 0;
}

//

void translateCallback(const sensor_msgs::CompressedImage::ConstPtr& msg)
{testmsg.data =msg->data;
//perturbedmsg.data = testmsg.data;
ROS_INFO("%s", msg->data.size());ROS_INFO( "test");
for (int i=0; i<msg->data.size();i++){
ROS_INFO( "test");
}

Thanks for the answers. The Version of William works very well. Those guys did a good job and they've already released a paper.

Yeah, that was the plan. I want to have a showcase for DDS, favoring it with ROS (e.g. using gazebo) and I'm very interested in using ROS. I thought there'd be more development of it. Next I'll try the one of William down there.

Hi everybody. At the moment I'm trying do build a DDS implementation on ROS. The only code I found about it was the https://github.com/osrf/ros_dds . I've build the cpp example and it worked, but when I want to build the prototype, the catkin_make is not working

***DDS parse error DDS undefined at line: 27 (searching from scope 'Time_')
make[2]: *** [~/ros_dds/ros_dds-master/prototype/devel/include/std_msgs/dds_impl/Time_.h] Error 255
make[1]: *** [ros-packages/std_msgs/CMakeFiles/std_msgs_generate_messages_idlcpp.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
[  7%] Built target actionlib_msgs_generate_messages_cpp
[  7%] Built target diagnostic_msgs_generate_messages_idl
[  7%] Built target diagnostic_msgs_generate_messages_cpp
make: *** [all] Error 2
Invoking "make" failed

Is there any solution for this? Is there any other prototype or developed thing? I don't want to wait until ROS2 is released :)

Because of ROS using Linux, it is easier to realize it with DDS on Linux. ATM I'm trying to get through this: https://github.com/osrf/ros_dds They're using Opensplice as DDS.

Hello everybody! I want to run my Lego NXT Robot with ROS, e.g. using RVIZ. Although using Kubuntu 14.04, I'm not fixed on this. I've followed the installation turtorial ( http://wiki.ros.org/Robots/NXT/electric ) even when it is expired. I changed

sudo sh -c 'echo "deb http://packages.ros.org/ros/ubuntu oneiric main" > /etc/apt/sources.list.d/ros-latest.list'

to trusty but sudo apt-get install ros-electric-nxtall says, that there are no files. Trying this with 12.04 it was the same. Are the sources shut down (or is it a problem with my installation)? Why is there no support anymore in the turtorial? I know this question has been asked many times, but I think this is a great topic. Even for kids to learn ROS.

Hi miltas, I am working on this topic too. I've done some research, but I only found this discussion: http://ros-users.122217.n3.nabble.com... How far are you with it?

Thanks for your descriptions! I have just another question belonging to the download of the RTI connext dds. in https://github.com/ros2/examples/wiki it is mentioned, that you can download the packages for Ubuntu, but there is only a readhead download possible. Or do I have to register myself?

Hello everybody! I just want to know, if there are more informations than these at desing.ros2.org . Is there a release date? Is there a community discussing about it? I just found the presentation at the roscon last september.