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2021-06-01 16:49:20 -0500 | commented answer | I am new to ROS and am wondering about the difference between launch script and launch node? Elaborating further: You create a node with some processes you wish to be carried-out such as interfacing with a serial |
2021-05-31 13:20:23 -0500 | answered a question | Setting logging directory per Node in Foxy It's a bit late, but it looks like this feature has been implemented in the latest ROS2 release, Galactic Geochelone! C |
2021-05-17 13:14:04 -0500 | commented question | Setting logging directory per Node in Foxy You could try splitting your nodes into individual launch files, and then make a "master" launch file that references th |
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2021-05-16 22:18:18 -0500 | marked best answer | [ROS2] Node Becomes Zombie, All Pubs/Subs "Dead" But Node Remains Active I have a node which is responsible for communicating with an Arduino via USB Serial. It seems to have problems only when it is receiving subscription data. I have another node acting as a PID speed controller publishing PWM values, and the Arduino node has two subscribers for these values (one per motor). Everything seems to start fine, but after reaching some unknown condition the Arduino node just simply stops responding. I cannot find any errors, warnings, etc. in the logs. I haven't observed any caught or uncaught exceptions. In fact, the node still catches keyboard interrupt exceptions and prints a corresponding "I was caught" info message to the ROS log. Running Running Running This is further corroborated by running None of this is running in a simulated manner. I have a robot which contains a RaspberryPi 4 and the Arduino, and I interact with them over wifi. Running all of the above commands on the RaspberryPi 4, as opposed to my main desktop computer, on my home network (i.e. congestion or network management can be ruled-out), shows no difference in behavior. I'm not sure how much I should copy/paste from my node as it has grown quite long, but below are some relevant tidbits. Let me know if I should elaborate further on anything! Also one final thing I will mention is that the PID Velocity controller producing the subscribed messages has a much lower publish frequency than any of the publishers and timers in this node (0.2 sec per publish vs 0.05 sec per encoder publish from serial_arbiter, for example). (more) |
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2021-05-16 22:18:10 -0500 | answered a question | [ROS2] Node Becomes Zombie, All Pubs/Subs "Dead" But Node Remains Active It took a lot of trial and error but I traced the problem to my serial_send function. The "dead" state of publishers an |
2021-05-16 21:53:15 -0500 | answered a question | Amcl:No laser scan received When your warning messages refer to a "transform" they are referring to /tf topic messages. It sounds like you need a " |
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2021-05-15 14:23:33 -0500 | commented answer | Hello, i am trying to do colcon build --symlink-install but getting following error. Any idea what is happening here? (...) same error comes up for rosidl_typesupport_introspection_c package. Is this package also for creating custom me |
2021-05-15 13:43:16 -0500 | commented answer | Explain in detail what each node does to which topic it sends, I don't understand anything Another important one to point out is that robot_state_publisher on the right side. As you can see from the flowchart it |
2021-05-15 13:42:48 -0500 | commented answer | Explain in detail what each node does to which topic it sends, I don't understand anything Another important one to point out is that robot_state_publisher on the right side. As you can see from the flowchart it |
2021-05-15 13:42:39 -0500 | commented answer | Explain in detail what each node does to which topic it sends, I don't understand anything Another important one to point out is that robot_state_publisher on the right side. As you can see from the flowchart it |
2021-05-15 13:41:07 -0500 | commented answer | Explain in detail what each node does to which topic it sends, I don't understand anything Another important one to point out is that robot_state_publisher on the right side. As you can see from the flowchart it |
2021-05-15 13:13:46 -0500 | commented answer | Explain in detail what each node does to which topic it sends, I don't understand anything To further clarify on the given example: move_base is publishing a "twist" message on the /cmd_vel topic. This is a Tw |
2021-05-13 18:51:42 -0500 | commented answer | Hello, i am trying to do colcon build --symlink-install but getting following error. Any idea what is happening here? Ahh I see. I avoided that page altogether and instead followed the "Installing Ros 2 on Ubuntu Linux" instructions page |
2021-05-13 17:34:34 -0500 | commented question | Launching 2 ros nodes What kind of parameters are these? Will they need to change after Node 2 has launched? Do you intend to launch Node 3/4/ |
2021-05-13 17:23:22 -0500 | commented answer | Hello, i am trying to do colcon build --symlink-install but getting following error. Any idea what is happening here? I misspoke; I meant /opt/ros which would contain everything within distribution-specific subdirectories. It sounds like |
2021-05-13 17:22:55 -0500 | commented answer | Hello, i am trying to do colcon build --symlink-install but getting following error. Any idea what is happening here? I misspoke; I meant /opt/ros which would contain everything within distribution-specific subdirectories. It sounds like |
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2021-05-13 17:17:07 -0500 | commented answer | Hello, i am trying to do colcon build --symlink-install but getting following error. Any idea what is happening here? Clarification: I meant /opt/ros not /opt/ros2 |
2021-05-13 15:40:31 -0500 | answered a question | Hello, i am trying to do colcon build --symlink-install but getting following error. Any idea what is happening here? That's quite a noisy output! The words not found appear 120 times in that blurb. It looks like it's related specificall |
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2021-05-13 15:23:54 -0500 | commented question | Launching 2 ros nodes Maybe there's an alternative approach. I don't think you'll be able to do this with a launch file, but you could probabl |
2021-05-13 15:20:26 -0500 | answered a question | How to change log directory on ROS2 Foxy? I haven't seen any references to changing the log file directory, but there are two options: Use a logging configurati |
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2021-05-12 15:46:24 -0500 | commented answer | can ros packages be directly used in ROS2? Adding to this: Many of the "little" things have changed with ROS2 (e.g. declaring parameters before their use, how the |
2021-05-12 15:46:09 -0500 | commented answer | can ros packages be directly used in ROS2? Adding to this: Many of the "little" things have changed with ROS2 (e.g. declaring parameters before their use, how the |
2021-05-12 15:38:20 -0500 | edited question | [ROS2] Node Becomes Zombie, All Pubs/Subs "Dead" But Node Remains Active [ROS2] Node Becomes Zombie, All Pubs/Subs "Dead" But Node Remains Active I have a node which is responsible for communic |
2021-05-12 15:35:49 -0500 | edited question | [ROS2] Node Becomes Zombie, All Pubs/Subs "Dead" But Node Remains Active [ROS2] Node Becomes Zombie, All Pubs/Subs "Dead" But Node Remains Active I have a node which is responsible for communic |
2021-05-12 15:35:18 -0500 | edited question | [ROS2] Node Becomes Zombie, All Pubs/Subs "Dead" But Node Remains Active [ROS2] Node Becomes Zombie, All Pubs/Subs "Dead" But Node Remains Active I have a node which is responsible for communic |
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2021-05-12 15:34:24 -0500 | asked a question | [ROS2] Node Becomes Zombie, All Pubs/Subs "Dead" But Node Remains Active [ROS2] Node Becomes Zombie, All Pubs/Subs "Dead" But Node Remains Active I have a node which is responsible for communic |
2021-05-12 04:06:13 -0500 | answered a question | ros2 launch or python3 foo.launch.py From what I've seen the ros2 launch <pkg> <launch_file> method is the "proper" way of doing it. If I had to |
2021-05-12 04:06:13 -0500 | received badge | ● Rapid Responder (source) |
2021-05-12 02:54:27 -0500 | commented question | ROS2 how to make a node read files When you build a ROS2 package using colcon build an install/ directory will be generated with your package and its files |
2021-05-11 20:54:13 -0500 | edited answer | RPI4 IMU ROS ERROR: 'required argument is not a float' when writing 'header: .... I'm more familiar with ROS2 than ROS1, but it could be the lines: current_time = rospy.Time.now() h.stamp = current_tim |
2021-05-11 20:51:33 -0500 | answered a question | RPI4 IMU ROS ERROR: 'required argument is not a float' when writing 'header: .... I'm more familiar with ROS2 than ROS1, but it could be the lines: current_time = rospy.Time.now() h.stamp = current_tim |
2021-05-11 20:51:33 -0500 | received badge | ● Rapid Responder (source) |
2021-05-11 20:13:00 -0500 | commented answer | Balancing Two-Wheeled Robot in ROS2-Foxy Adding onto this post, I found it helpful to look through these links: A ROS1 differential drive node created by Jon S |
2021-05-11 20:12:35 -0500 | commented answer | Balancing Two-Wheeled Robot in ROS2-Foxy Adding onto this post, I found it helpful to look through these links: A ROS1 differential drive node created by Jon S |
2021-05-11 20:11:42 -0500 | commented answer | Balancing Two-Wheeled Robot in ROS2-Foxy Adding onto this post, I found it helpful to look through these links: A ROS1 differential drive node created by Jon S |
2021-05-11 20:11:24 -0500 | commented answer | Balancing Two-Wheeled Robot in ROS2-Foxy Adding onto this post, I found it helpful to look through these links: - A ROS1 differential drive node created by Jon |
2021-05-11 20:11:16 -0500 | commented answer | Balancing Two-Wheeled Robot in ROS2-Foxy Adding onto this post, I found it helpful to look through these links: - A ROS1 differential drive node created by Jon |
2021-05-11 20:11:06 -0500 | commented answer | Balancing Two-Wheeled Robot in ROS2-Foxy Adding onto this post, I found it helpful to look through these links: - A ROS1 differential drive node created by Jon |