vinmean's profile - activity

How to use getNodeHandle ? I have a node which uses private node handle to advertise topics. I wanted to subscribe to a

Can rosbag 'buffer exceeded' error be overcome by increasing the RAM? I am trying to record a number of topics which inc

Can rosbag 'buffer exceeded' error be overcome by increasing the RAM? I am trying to record a number of topics which inc

I want a while loop to run at 400 Hz. I used the below format for my loop

ros::Rate loop_rate(400)
while(ros::ok())
{
  //do stuffs
  ros::spinOnce();
  loop_rate.sleep();
}

I even published a topic within the loop and when the topic is subscribed to, it shows 400Hz. But when I use a cpu clock based timer, the loop seems to run much faster. So when I use a ros::Rate::sleep() is there no guarantee that the individual steps run at the set frequency?

boost::timer t;
while(ros::ok())
{
  //do stuffs
  std::cout<< t.elapsed() << std::endl;
  t.restart();
  ros::spinOnce();
  loop_rate.sleep();
}

The output of the timer is as below (in Secs) which should have been around 0.0025 for a 400 Hz loop.

0.000118
0.000109
0.000138
0.000123
.
.

Clear the devel and build folder (along with hidden files) and do a catkin_make again. The devel/.catkin and build/.project files at times have details of other workspaces for some reason.

The workaround I did finally was to run the launch file from a shell script in the embedded platform. I wrote the roslaunch command on a shell script and placed it in the package folder. Then called the shell script like a node from the remote PC launch file.

<node machine="tegra" type=run_launch.sh pkg=ros_package_name name=run_launch output="screen"/>

I upgraded paramiko on the PC

Thank you. I removed the parentheses from the command and then it executes without any error. So how do I ensure cmake generates a command without these brackets? I see that only the vtk command options seems to have this problem.

I have to run a remote launch file running on an embedded board. My PC runs indigo and the board runs kinetic. The launch file in my PC is

<launch>
<machine name = "tegra-ubuntu" address="tx1" user="ubuntu" password="ubuntu" env-loader="/home/ubuntu/workspace/Jetson/ROS_Workspace/branches/tx1/iruVizhi_v1/setup.sh" default="true"/>
<include file="$(find xsens_driver)/launch/xsens_driver.launch" machine="tegra-ubuntu"/>
<node machine="tegra-ubuntu" type="mtnode.py" pkg="xsens_driver" name="xsens_driver" output="screen"/>
<node machine="tegra-ubuntu" type="odom_listener_node" pkg="ego_motion" name="ego_motion_node" output="screen"/>
</launch>

However, when I do a roslaunch, the launch fails by saying ResourceNotFound. Even though I mentioned the machine to find the launch file, the search seems to happen in the local system. If I give the complete path of the launch file like this

<include file="/home/ubuntu/workspace/Jetson/ROS_Workspace/branches/tx1/iruVizhi_v1/src/xsens_driver/launch/xsens_driver.launch" machine="tegra-ubuntu"/>

I get the error

Invalid roslaunch XML syntax: [Errno 2] No such file or directory:

I am pretty sure that my file paths are correct. Remote nodes doesn't have any issue with execution.

What could possibly be a reason for this?

Thanks for the comment. Yes, you were right. The PC was running 14.04 and the embedded device was running 16.04.

I upgraded paramiko to fix this problem

sudo pip install paramiko --upgrade

I want to launch a node on a remote embedded system from my PC. My PC happens to run ROS indigo and the embedded platform runs ROS Kinetic. I made a launch file to run remote node.

<launch>
<machine name = "tegra-ubuntu" address="101.134.21.165" user="ubuntu" env-loader="/opt/ros/kinetic/env.sh"/>
<node machine="tegra-ubuntu" name="ego_motion" pkg="ego_motion" type="odom_listener_node"/>
</launch>

When I do a ros launch from the host system to this remote system I get the following error

deepak@sword:~/workspace/ROS_Workspace/iruVizhi_v1/src/remote/launch$ roslaunch remote remote.launch 
... logging to /home/deepak/.ros/log/ff8de646-c4e3-11e6-a1a7-ac7ba196454c/roslaunch-sword-18118.log
Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

started roslaunch server http://101.134.21.160:38258/
remote[101.134.21.165-0] starting roslaunch
remote[101.134.21.165-0]: creating ssh connection to 101.134.21.165:22, user[ubuntu]
remote[101.134.21.165-0]: failed to launch on tegra-ubuntu:

Unable to establish ssh connection to [ubuntu@101.134.21.165:22]: Incompatible ssh peer (no acceptable kex algorithm)


[101.134.21.165-0] killing on exit
unable to start remote roslaunch child: 101.134.21.165-0
The traceback for the exception was written to the log file

I get this "Incompatible ssh peer (no acceptable kex algorithm)" error. Is there a fix for this problem? Is it because I use ROS Indigo and Kinetic on these machines?