Gabbar's profile - activity

Yes, I have just checked after posted and it works. Thanks.

[ROS2] No Package Found in Pure Python Package with setup.py (With new Ubuntu 18.04+Dashing) Hi, I have created a new p

@Mani @ahendrix Please post if you have a solution regarding combine plugin with rqt_image_view.

Please post if you have solution regarding combine plugin with rqt_image_view.

Hi,

I have previously used rospy and added publisher as rospy.create_publisher(type, topic, queue_size) but i am not able to see the proper solution in ROS2 as rclpy.create_publisher has no queue_size argument.

Please suggest me to clear this hurdle.

Thanks a lot. Your answer can clear many doubts.

How to add queue size in rclpy.create_publisher Hi, I have previously used rospy and added publisher as rospy.create_pu

ros param server related migration to ros2 in Python Hi, I have a dependency of the get_param method of rospy in ros2 (

@Dirk Thomas Yes, I have tried rqt_graph command and it is opening one window like rqt and rqt_plot but specifically fo

Hi,

I have seen rqt_visualization and found that rqt_graph is already ported for the Crystal. I have run rqt_graph by rosrun rqt_graph rqt_graph command in ROS1 (melodic) but don't know about Crystal.

I have tried ros2 run rqt_graph rqt_graph after building on crystal and source setup.bash but not able to run.

Please provide me guidance for the same.

How to rqt_graph in ROS2? Hi, I have seen rqt_visualization and found that rqt_graph is already ported for the Crystal.

How to rqt_graph in ROS2? Hi, I have seen rqt_visualization and found that rqt_graph is already ported for the Crystal.

How to rqt_graph in ROS2? Hi, I have seen rqt_visualization and found that rqt_graph is already ported for the Crystal.

How to rqt_graph in ROS2? Hi, I have seen rqt_visualization and found that rqt_graph is already ported for the Crystal.

Hi,

I have tried rosbag2 on latest build Crystel and also play following commands but it gives me some errors. Please guide me for running rosbag2 with the simple example.

1. ros2 bag record -a
2. ros2 bag play rosbag2_2019_01_22-17_57_14/rosbag2_2019_01_22-17_57_14.db3
3. ros2 bag info rosbag2_2019_01_22-17_41_19/rosbag2_2019_01_22-17_41_19.db3

Error:

DISCLAIMER
ros2 bag is currently under development and not ready to use yet
[ERROR] [rosbag2_storage]: Failed to load metadata: Exception on parsing info file: bad file
[ERROR] [rosbag2_storage]: Could not open 'rosbag2_2019_01_22-18_03_08/rosbag2_2019_01_22-18_03_08.db3' with 'sqlite3'. Error: Failed to read from bag 'rosbag2_2019_01_22-18_03_08/rosbag2_2019_01_22-18_03_08.db3': No metadata found.
[ERROR] [rosbag2_storage]: Could not load/open plugin with storage id 'sqlite3'.
[ERROR] [rosbag2_transport]: Failed to play: No storage could be initialized. Abort

Hi,

I have gone through the pcl_ros source code and understand all things how it is using PCL. I have cleared understanding regarding the pcl_ros - PCL but not understand how .launch file using its "oninit" and "subscribe" functions in nodelet without calling it (or without any specific main/application file).

For example, In the sample_voxel_grid.launch file mentioned that it is using voxel_grid nodelet but not understand, how it is operating the nodelet.

Anyone can please describe how .launch uses "onInit" and "Subscribe" of nodelet?

Edit:

Hi @Delb

Example: If you see filter.cpp in pcl_ros, you will find the following functions.

void pcl_ros::Filter::computePublish (const PointCloud2::ConstPtr &input, const IndicesPtr &indices) 
void pcl_ros::Filter::subscribe()
void pcl_ros::Filter::unsubscribe()
void pcl_ros::Filter::onInit ()
void pcl_ros::Filter::config_callback (pcl_ros::FilterConfig &config, uint32_t level)
void pcl_ros::Filter::input_indices_callback (const PointCloud2::ConstPtr &cloud, const PointIndicesConstPtr &indices)

Flow is like onInit -> config_callback and

subscribe -> input_indices_callback -> computePublish.

So, when call subscribe, it will operate other operations. My question is onit is load by nodelet manager (via .launch file) but here I can see subscribe also operated when I run .launch file. How subscribe function called by nodelet manager/.launch?