Alsing's profile - activity

Not relevant with ROS2 in the horizon, and it's just poor architecture to have this issue.

Question probably not relevant due to incomplete API (I think highly likely) and not worth fixing with ROS2 in the horiz

@Lieu Zheng Hong , you might want to try with the default Ubuntu desktop. I experienced the same issue with an alternati

Example for Rosdep yaml using source I refer to this rosdep guide, where it shows the possible methods of getting a syst

Design choices for Parameter Server I was reading in depth the wiki for Parameter Server and am curious about the right

Needed to use Yujin's Velocity Smoother, but unable to catkin_make due to missing file. No one else seemed to have this issue hence I'm opening a new question. I git cloned the devel branch.

Here is the error I got:

/home/bla/catkin_ws/src/yujin_ocs/yocs_joyop/src/joyop.cpp:15:38: fatal error: yocs_msgs/JoystickConfig.h: No such file or directory

compilation terminated.

yujin_ocs/yocs_joyop/CMakeFiles/joyop.dir/build.make:62: recipe for target 'yujin_ocs/yocs_joyop/CMakeFiles/joyop.dir/src/joyop.cpp.o' failed

make[2]: *** [yujin_ocs/yocs_joyop/CMakeFiles/joyop.dir/src/joyop.cpp.o] Error 1

CMakeFiles/Makefile2:25342: recipe for target 'yujin_ocs/yocs_joyop/CMakeFiles/joyop.dir/all' failed   
make[1]: *** [yujin_ocs/yocs_joyop/CMakeFiles/joyop.dir/all] Error 2

make[1]: * Waiting for unfinished jobs....

I am cleaning up my ros code base, applying catkin_lint and reading the C++ ROS Style Guide etc etc, soon going to implement unit test and have clang-check look at it.

Catkin_lint warns that I dont have any targets installed, which is true, because i have only add_executable(...). I have tried understanding the catkin documentation explaining between install(...) and add_executable(...) from catkin documentation

What is the observable/performance difference between installing and adding the executable?

Edit: Print of the error i got.

ryan@Macbuntu:~/catkin_ws/src/$ catkin_lint guide_pkg -W2
guidance: warning: target 'power' is not installed
guidance: warning: target 'pursuit' is not installed
guidance: warning: target 'goal' is not installed
guidance: warning: target 'kill_goal' is not installed
guidance: warning: target 'speed_cmd_mux' is not installed
guidance: notice: meaningless package description 'The guide package'
guidance: notice: target name 'power' might not be sufficiently unique
guidance: notice: target name 'pursuit' might not be sufficiently unique
guidance: notice: target name 'goal' might not be sufficiently unique
guidance: notice: target name 'kill_goal' might not be sufficiently unique
guidance: notice: target name 'speed_cmd_mux' might not be sufficiently unique
guidance: CMakeLists.txt(6): notice: list COMPONENTS should be sorted
catkin_lint: checked 1 packages and found 20 problems

Check conditions to identify XmlRpc error: cannot marshal None unless allow_none is enabled Hi I'm using roscpp on ROS K

Roger that! Just thought it might be a problem more commonly faced here than elsewhere.

Assigning a USB port to an identifier. I am using two identical cameras, for example one for the front and the other for

limit ros node to single cpu core Hi! I am using ORB_SLAM for a specific use case. In that use case, I don't need very

difference between install and executable in CMakeLists. I am cleaning up my ros code base, applying catkin_lint and rea

difference between install and executable in CMakeLists. I am cleaning up my ros code base, applying catkin_lint and rea

I have a workstation(hostname ubuntu) at 192.168.1.51, a machine(hostname CPR-SMIT03) at 192.168.1.105

I am able to teleop the machine with a joystick from my workstation. The publish/listener tutorial also works fine both ways.

However, I am unable to rostopic echo /tf or any other topics for that matter, despite being able to run rostopic list on the workstation.

On my machine, I could run both commands. I have read the pre-existing threads about being able to list rostopics but unable to echo them, but I they haven't helpful enough for me. Looking really for more instructive guidance.

On my workstation's .bashrc:

export ROS_IP=192.168.1.51
export ROS_MASTER_URI=http://192.168.1.105:11311

In my workstation's /etc/hosts:

127.0.0.1       localhost
127.0.1.1       ubuntu
192.168.1.105   CPR-SMIT03

On my machine's .bashrc:

export ROS_IP=192.168.1.105
export ROS_MASTER_URI=http://192.168.1.105:11311

In my machine's /etc/hosts:

127.0.0.1    localhost 
127.0.1.1    CPR-SMIT03
192.168.1.51 ubuntu

Update: running "rostopic info /tf" on both the "machine" and my workstation shows publishers and subscribers at 192.168.10.1:[various ports]. Other rostopics demonstrate the same IP address for publishers and subscribers. Does that mean anything?

Example for "rosnode info /imu/declination_compute"

Node [/imu/declination_compute]

Publications:
* /rosout [rosgraph_msgs/Log]
* /imu/declination [std_msgs/Float32]

Subscriptions:
* /navsat/fix [sensor_msgs/NavSatFix]

Services:
* /imu/declination_compute/set_logger_level
* /imu/declination_compute/get_loggers

contacting node http://192.168.10.1:36537/ ...
Pid: 2954
Connections:

* topic: /rosout
    * to: /rosout
    * direction: outbound
    * transport: TCPROS
* topic: /imu/declination
    * to: /imu_compass
    * direction: outbound
    * transport: TCPROS
* topic: /navsat/fix
    * to: /navsat/nmea_topic_driver (http://192.168.10.1:57719/)
    * direction: inbound
    * transport: TCPROS

Is there a way I could publish a node at a different rate of subscribing?

I do intend to have a python script instercept /cmd_vel and publish it 5 times faster in incrementally.

For eg:

pub = rospy.Publisher("/cmd_vel", Twist)
rospy.SUbscriber("/pre_cmd_vel")
i = 1
rate = rospy.Rate(10)
while linear.change < 5:
    rate = rospy.Rate(50)    
    p.linear.x = i
    pub.publish(p)
    i = i + 1
    rate.sleep()
rate = rospy.Rate(10)`

Would something like that work? SInce jerking is caused by acceleration, breaking a command for a sudden jump in velocity into smaller blocks would give less jerk?