iabadia's profile - activity

Hi,

I'd like to know how the clock signal works when running a ROS sytem across multiple machines (all machines using the same master, of course). Does the ROS Master set the clock signal for all nodes on all machines? Or does each machine have its own clock signal?

Thanks in advance,

Ignacio

Clock signal across multiple machines Hi, I'd like to know how the clock signal works when running a ROS sytem across

Clock signal across multiple machines Hi, I'd like to know how the clock signal works when running a ROS sytem across

Remote node running on/off Hi, I am running a node on a remote machine but the node continuously goes on and off. I a

Hi,

I am trying to install rqt-plot (I am running ROS Kinetic on Ubuntu 16.04).

When running sudo apt-get install ros-kinetic-rqt-plot I get the following error:

Err:1 http://packages.ros.org/ros/ubuntu xenial/main amd64 ros-kinetic-qt-gui-py-common amd64 0.3.11-0xenial-20180830-074357-0800 404 Not Found [IP: 140.211.166.134 80]

Err:2 http://packages.ros.org/ros/ubuntu xenial/main amd64 ros-kinetic-qwt-dependency amd64 1.1.0-0xenial-20180809-134545-0800 404 Not Found [IP: 140.211.166.134 80]

Err:3 http://packages.ros.org/ros/ubuntu xenial/main amd64 ros-kinetic-rqt-py-common amd64 0.5.0-0xenial-20190320-153730-0800 404 Not Found [IP: 140.211.166.134 80]

Err:4 http://packages.ros.org/ros/ubuntu xenial/main amd64 ros-kinetic-rqt-plot amd64 0.4.8-0xenial-20190320-171954-0800 404 Not Found [IP: 140.211.166.134 80]

E: Failed to fetch http://packages.ros.org/ros/ubuntu/po... 404 Not Found [IP: 140.211.166.134 80]

E: Failed to fetch http://packages.ros.org/ros/ubuntu/po... 404 Not Found [IP: 140.211.166.134 80]

E: Failed to fetch http://packages.ros.org/ros/ubuntu/po... 404 Not Found [IP: 140.211.166.134 80]

E: Failed to fetch http://packages.ros.org/ros/ubuntu/po... 404 Not Found [IP: 140.211.166.134 80]

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

I can ping packages.ros.org and 140.211.166.134 , so it doesn't seem to be a connectivity issue...

Any ideas on what's going on and how to fix it and proceed with the installation?

SOLUTION: as commented by @gvdhoorn the key has to be updated as described in #q325039.

Then run sudo apt update :

Obj:1 http://es.archive.ubuntu.com/ubuntu xenial InRelease
Obj:2 http://es.archive.ubuntu.com/ubuntu xenial-updates InRelease                                                                                                                  
Obj:3 http://es.archive.ubuntu.com/ubuntu xenial-backports InRelease                                                                                                                
Ign:4 http://dl.google.com/linux/chrome/deb stable InRelease                                                                                                               
Des:5 http://security.ubuntu.com/ubuntu xenial-security InRelease [109 kB]                                                                             
Obj:6 http://dl.google.com/linux/chrome/deb stable Release                                                      
Des:7 http://packages.ros.org/ros/ubuntu xenial InRelease [4.678 B]                                             
Des:9 http://packages.ros.org/ros/ubuntu xenial/main amd64 Packages [785 kB]                   
Des:10 https://packagecloud.io/AtomEditor/atom/any any InRelease [23,2 kB]
Ign:10 https://packagecloud.io/AtomEditor/atom/any any InRelease                      
Des:11 http://packages.ros.org/ros/ubuntu xenial/main i386 Packages [561 kB]
Descargados 1.483 kB en 3s (396 kB/s)
Leyendo lista de paquetes... Hecho

Failed to install rqt-plot Hi, I am trying to install rqt-plot (I am running ROS Kinetic on Ubuntu 16.04). When runn

Failed to install rqt-plot Hi, I am trying to install rqt-plot (I am running ROS Kinetic on Ubuntu 16.04). When runn

You are right, stupid mistake, I didn't add the message_filters libraries in the CMakeLists.txt. Problem solved, thanks

Dear all,

I am trying to use the TimeSequencer filter of the message_filters library to introduce a delay to a certain topic. I have created a simple example following the documentation on http://wiki.ros.org/message_filters

#include "ros/ros.h"
#include "std_msgs/String.h"
#include "geometry_msgs/PoseStamped.h"
#include <message_filters/subscriber.h>
#include <message_filters/time_sequencer.h>

void chatterCallback(const geometry_msgs::PoseStamped::ConstPtr& msg)
{
  ROS_INFO("Msg received");

}

int main(int argc, char **argv)
{
  ros::init(argc, argv, "subscriber");

  ros::NodeHandle n;

  message_filters::Subscriber<geometry_msgs::PoseStamped> sub(n, "chatter", 1);
  message_filters::TimeSequencer<geometry_msgs::PoseStamped> seq(sub, ros::Duration(0.1), ros::Duration(0.01), 10);
  seq.registerCallback(chatterCallback);
  ros::spin();

  return 0;
}

However, I get a compilation error stating " undefined reference to `message_filters::Connection::disconnect()' ". Here is the whole compilation error message:

CMakeFiles/Subscriber.dir/src/Subscriber.cpp.o: In function `message_filters::TimeSequencer<geometry_msgs::PoseStamped_<std::allocator<void> > >::~TimeSequencer()':
Subscriber.cpp:(.text._ZN15message_filters13TimeSequencerIN13geometry_msgs12PoseStamped_ISaIvEEEED2Ev[_ZN15message_filters13TimeSequencerIN13geometry_msgs12PoseStamped_ISaIvEEEED5Ev]+0x2d): undefined reference to `message_filters::Connection::disconnect()'

Does anyone know where the error comes from? I have searched for more documentation but I haven't found a solution. Any help would be very much appreciated.

I am running ROS Kinetic on Ubuntu 16.04.

Thanks in advance,

Ignacio

Message_filters TimeSequencer compile error Dear all, I am trying to use the TimeSequencer filter of the message_filte

Message_filters TimeSequencer compile error Dear all, I am trying to use the TimeSequencer filter of the message_filte

Message_filters TimeSequencer compile error Dear all, I am trying to use the TimeSequencer filter of the message_filte

Message_filters TimeSequencer compile error Dear all, I am trying to use the TimeSequencer filter of the message_filte

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Reducing the trajectory speed in fact increases the precision on execution (just in case it helps others, to change the

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