Sapodilla's profile - activity

Publisher and subscriber have more than one Datawriter and Datareader as default Hi everyone, I am investigating the D

Error when profiling ROS2 with perf record Hi everyone, As stated in the title, I would like to do some profiling with

Hi everyone,

First of all, I just learned about ROS2 so I am not so familiar with it. Also, I apologize for my bad English.

I am now working on how to implement QoS in my subscription. I have a little bit experience on eProsima FastRTPS and I did manage to run publisher and subscriber with QoS policies. Thus, I expected ROS2 works quite the same way. Here I want to have a deadline policy with a callback function. However, I were lost while trying to set up the callback because in FastRTPS, it has publisher/subscriber listener, which handles all the event callback functions. In ROS2, I do not know where and how to put or configure callback function. I had a look in SubscriptionEventCallbacks class but it did not work (maybe I set it wrongly). After searching on internet, I have not had any clue yet.

Below is a part of my code trying to configure QoS (I am also not expert on C++ and I am learning it, so feel free to put any comment):

Listener(): Node("Listener_node") // Constructor
{
rclcpp::QoS qos_profile(10);
std::chrono::milliseconds deadline_time(1000);
qos_profile.deadline(deadline_time);
Subscription = this->create_subscription<std_msgs::msg::String>("topic",qos_profile,std::bind(&Listener::callback,this,std::placeholder::_1));
}

Any recommendation, comment or hint is welcomed!

Thanks

Thanks Steven! Since your answer is sufficient for me, I mark it as correct one.

Hi everyone,

As stated in the title, does ROS2 have topic with keys? I have been studying ROS2 for few weeks and I have looked around but cannot find anywhere stating about keyed topic in ROS2.

Maybe I have missed something or ROS2 uses this properties in a different way. Thanks in advance for any answer!

Cheers!

Does ROS2 support keyed topic? Hi everyone, As stated in the title, does ROS2 have topic with keys? I have been studyi

To whoever struggles the same problem as me, for having your callback function for QoS, specify the callback function in

Hi Steven, sorry for my late response. I already found the solution for my issue a few second before typing this comment

Hi Steven, sorry for my late response. I already found the solution for my issue a few second before typing this comment

ROS2 QoS callback function Hi everyone, First of all, I just learned about ROS2 so I am not so familiar with it. Also,

Thanks a lot! That is very helpful. I will keep that in mind.

Thanks for your confirmation! How about my question about data and field in pointcloud2? By the way, I checked the width

Learning about pointcloud, pointcloud2 data Hi everyone, I am doing a project implementing VLP-16 lidar from Velodyne.

Learning about pointcloud, pointcloud2 data Hi everyone, I am doing a project implementing VLP-16 lidar from Velodyne.

Error when installing velodyne lidar on ROS Hi, I am freshly new to ROS, so forgive if I ask inappropriate question and