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2021-03-16 08:06:13 -0500 | marked best answer | how to execute service while getting subscriber messages I want to build a service to move to a particular point on a line. The problem is when I receive my service call, the thread is stuck in this callback and so global spinner in another thread does not process callback queue. I have read some handy advice in a related question, however I see no way to use multithreaded or async spinner elegantly in my case. Omitting some irrelevant details, I have two nodes that give me odometry and expect twist respectively, thus managing an engine. As a backbone of my node I have a software PID regulator, that tells me what speed I should set in twist for a good speed profile based on current goal and current odometry. I used three std::thread's: to run the service's callback, to publish twist on odometry callback and to run spinOnce() with some loop rate. As soon as I stop in service callback (locked by a mutex set in PID regulator until I reach destination), odometry callback is never triggered. I could implement my own child class from ros::Spinner that could process my service calls asynchronously and all other messages synchronously, but that sounds like overengineering for such a primitive system. What am I missing? |
2021-03-16 08:02:46 -0500 | answered a question | ros2 topic empty with fastdds discovery server I do not know exact mechanics of daemon caching data, but I sometimes see incomplete or even empty ros2 topic list, ros2 |
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2019-04-02 04:28:29 -0500 | commented answer | undefined reference to actionlib::GoalIDGenerator::GoalIDGenerator() You saved my day |
2019-04-01 08:00:13 -0500 | asked a question | how to execute service while getting subscriber messages how to execute service while getting subscriber messages I want to build a service to move to a particular point on a li |
2019-03-22 06:39:43 -0500 | commented answer | Workflow for CLion and ROS Thank you for the link on CMake/package.xml differences. I agree that working with distributed metadata is hardly seen i |
2019-03-22 06:05:41 -0500 | commented answer | Workflow for CLion and ROS My bad, find_package is a standard CMake part indeed. Things like add_action_files and catkin_add_gtest can be considere |
2019-03-22 05:15:54 -0500 | answered a question | Workflow for CLion and ROS As far as I understand, you are not missing anything. The core problem with ROS workflow is that ROS is still very imma |
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2019-03-01 07:26:27 -0500 | asked a question | Service with thread-safe request queue Service with thread-safe request queue I am using smach for developing logic of my system and my automata work in event- |
2019-02-13 05:44:53 -0500 | commented answer | pycharm setup Surprisingly, PyCharm run from the terminal works fine, while patching .desktop with -i -c options does not enable PyCha |
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2019-02-11 02:52:59 -0500 | commented answer | How can I update/remove cmake without partially deleting my ROS distribution? thanks, worked like a charm for me on Ubuntu 16.04.05 |
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2019-01-28 02:58:30 -0500 | marked best answer | precise timing with rosbag or an alternative The beginner's tutorial reads, that 1) Could 2) Are there alternative means of recording and playing messages and requests/responses with precise timing (95% <1ms)? Unfortunately, some non-trivial data like camera output might be involved. For simplicity let's assume we work with a single machine to avoid network latency issues. ROS Kinetic, Ubuntu 16.04.05 x64. |
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2019-01-24 05:53:19 -0500 | commented answer | cpp publisher/subscriber tutorial loosing some messages @Alberto E. As a final note, could you share a piece of advice on how to look up the names of subscribers? This could en |
2019-01-24 05:29:00 -0500 | commented answer | cpp publisher/subscriber tutorial loosing some messages @Alberto E. As a final note, could you share a piece of advice on how to look up the names of subscribers? This could en |
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2019-01-24 05:24:40 -0500 | commented answer | cpp publisher/subscriber tutorial loosing some messages Not only did your solution work, but it is also much more reliable and avoids ugly guess-waiting-time question. |
2019-01-24 05:23:38 -0500 | marked best answer | cpp publisher/subscriber tutorial loosing some messages I was following the tutorial) and faced the following problem: some messages (usually 3) are lost when doing the sequence:
For example, an output like this is produced in the talker window: While in the listener window only latter are shown: There is no such problem with the Python publisher/subscriber, not even a single message was lost. ROS Kinetic, Ubuntu 16.04.05 x64 (run under VirtualBox with Win7 x64 as a host). No original files were changed, just copy and paste from the tutorials. |
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2019-01-24 05:21:47 -0500 | asked a question | precise timing with rosbag or an alternative precise timing with rosbag or an alternative The beginner's tutorial reads, that rosbag may be not precise when it comes |
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2019-01-24 02:00:56 -0500 | commented question | cpp publisher/subscriber tutorial loosing some messages @curi_ROS increasing queue size from 1000 to 10,000 did not give any difference. As only 3 messages were lost, buffer si |
2019-01-24 01:57:46 -0500 | answered a question | cpp publisher/subscriber tutorial loosing some messages As @mali suggested, the problem was in time to initialize the publisher (actually, it took up to 30 milliseconds). Addin |
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2019-01-23 05:07:54 -0500 | asked a question | cpp publisher/subscriber tutorial loosing some messages cpp publisher/subscriber tutorial loosing some messages I was following the tutorial and faced the following problem: so |