Questions tagged [timer]
The timer tag has no usage guidance.
45
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How do you change a ROS2 WallTimer period after initialization?
Is there a way in ROS2 to use the ROS1 WallTimer function setPeriod? I'm trying to change the timer's period in runtime in my C++ node. Currently I cancel the ...
- 11
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44
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error: no type named ‘type’ in ‘struct std::enable_if<false, void>’ when calling rclcpp::create_timer()
I am trying to convert a piece of code written in ROS1 to ROS2. I am having trouble with the following line, which instantiates a ros:::Timer object:
in ROS1:
...
0
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15
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Multiple publishers and a timer to publish tf in the same node is leading to crash
Description
I have a node that publishes 2 topics and a timer to publish TF using ros-noetic. However this setup throws an exception:
...
- 125
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18
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how to manage a timer in a pytest?
I've got a Node that publish a message in a timer. The code works fine but I want to write a pytest to ensure the message is published.
My test code is this one
...
- 31
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3
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noetic createTimer always segfault
Hi,
After introducing ROS to my program with success, i wanted to use it more and added timer.
I am using the same code on both Ubuntu20/noetic and Ubuntu18/melodic without any issue.
But with timer i ...
qualiticsbe
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1
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8
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Can ROS timers be safe to clock jumps?
Ubuntu 20.04, ROS noetic
It seems that ROS timers are not completely robust to clock jumps e.g. from daylight time savings.
I created a ros::WallTimer that triggered every second and logged the ...
knxa
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1
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26
views
why does rclpy timer have no update method and stored in ns?
using rclpy timer there does not appear to be any method for updating the timer period/interval there is simply a timer_period_ns variable which can be changed but it feels a bit off, especially the ...
masynthetic
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2
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159
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Create wall timer using callback with parameters - ROS2, C++
Hi. I have two image msg synchronized as follows:
...
mirella melo
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1
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24
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Do Timers run in different threads? [roscpp]
I'm wondering if I'm setting up different timers, do they run in different threads using roscpp? The background is that one Timer callback is taking a longer time to be executed and, therefore, I want ...
prex
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1
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194
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How should I create a timer in ros2?
I am looking for the create_timer function in ros2 but I only find the rclcpp::Node::create_wall_timer.
From my understanding there should be some abstract create_timer function (instead of wall timer)...
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7
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createTimer() replacement in eloquent
In ROS1 we can simply do:
ros::Timer timer = nh.createTimer(ros::Duration(0.1), timerCallback);
This gives us a tick approximately every 100 ms of ROS time. In ...
KenYN
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1
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1
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ROS Answers SE migration: Ros2 Stopwatch
Hi guys,
I want to implement a timer thats working like a stopwatch to check if my joy_node is continously sending messages.
Everytime it gets called the timer starts and if it doesnt get called again ...
pfedom
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1
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14
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Timer callback function do not working when action server be called?
##Timer callback function do not working when action server be called?##
Hello, I find a interested problem just now. It was action server callback function may ...
snowman
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1
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8
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how to use Twist with Timer()
I'd like to make the robot moves a certain time toward x-direction using Twist with Timer
full code:
...
Redhwan
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1
answer
6
views
Wait for timer to be stopped
Hi everybody,
I'm working on a state_machine right now and I have the following problem:
I have a ROS timer running on a timerCallback which supervises the current states and depending on the state ...
LeoE
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1
answer
10
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ROS2 serious memory leak when using timer?
I have created almost the simplest ROS node possible in python with a single time doing nothing - code below. When I run it, memory consumption continuously increases and ultimately the my memory is ...
ahlyder
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1
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11
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In ROS2, is a wall timer connected to a node in a way meaningfull for a user
Hi, I need an object (a node) to create a timer in ROS2. I can create any node just in order to call the respective method create_wall_timer, but I would like to ...
uthinu
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1
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1
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How to call a service with begin and end time as request/input
Hi,
I am looking to call laser_assembler call back service -AssembleScans .
...
BhanuKiran.Chaluvadi
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1
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6
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Does ros::Timer::hasPending method actually work?
I used it expecting that it will return true after starting the timer, until the callback get's called (in a one-shot timer). But I turned out to be wrong; the following program will return always ...
jorge
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1
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1
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ROS Answers SE migration: ros timer bug?
Hi,
I'm currently writing a simple application to publish a message only for certain time. For that I used a oneshoot timer which is setting a flag. The outcome was that the flag and so the timer ...
TwoBid
0
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1
answer
5
views
ros::Time::now() very different in callback
Hi,
I am getting very different results when calling ros::Time::now() in the main function and in a Timer's callback function.
I want to get the elapsed time since the Timer began, so I have something ...
sterlingm
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1
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3
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How Timer Callback Function Does the Timing?
I want to know how accurate ROS timer is. So for example, I create the timer as follows:
...
Winston
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1
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8
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How to Improve Inaccurate ROS Timer
I use a ROS timer in my progarm and plot the difference between the expected event time and the real event time as follows: ...
Winston
0
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1
answer
3
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Publish at the time of a vector
Dears,
I have a vector containing double type numbers representing the ros time that I recorded from a previous simulation.
I need to publish data of a node at this given time.
I try to explain better:...
nikkk
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1
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4
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How does rospy.Timer behave if it triggers while the previous callback is still busy?
I'm using a rospy.Timer (periodic, not one-shot) to handle a long-running process in a non-blocking way. I only want one instance of the process to be running at ...
spmaniato
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1
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2
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does callbacks get drop from queue when it is exceeded it expected execution time by too much
Current I have a application with a timer which triggers at a fixed interval to grab a frame from a camera stream. This works fine when only two camera streaming at 720p are running. When all 3 of my ...
zenifed
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1
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6
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Rosbag and simulated time
Hello all,
I am trying to run a bag file if simulated time but I am not succeeding on it. Here is what happens:
After I run the bag file with the command
...
Randerson
0
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1
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1
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ROS Timer: difference between types of NodeHandles?
Dear all,
a student approached me a day back with a question that I just couldn't answer:
"Should a ROS timer be on a a private NodeHandle, or on a global one?" (or any other, obviously...)
...
- 5,805
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3
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Thread safety and rospy Timer
I'm a little confused by how rospy.Timer works with regards to thread-safety. My understanding of callbacks in rospy in general is they're essentially handled sequentially during calls to Sleep and ...
etappan
0
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1
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3
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Timer fires all at once
I'm on Ubuntu 14.04 with ROS Indigo. I'm trying to repeat a published message for a few times, with some delay in between. It seemed that a ros::Timer was the tool ...
RafBerkvens
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1
answer
8
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Setting Timer period for next callback
Hi, I have a ros::Timer that I want to change the period for at each callback. In the callback function, I'm calculating the time I want the next callback to occur at and calling setPeriod. However, ...
sterlingm
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1
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3
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Right Angle Turn Problem
Hi,
I'm trying to move my urdf model on a rectangular/square trajectory in rviz. In order to do that I try to broadcast certain transforms within certain time intervals using a timer. But the robot ...
emreay
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1
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2
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how to use Timer
I have read the tutorial on webpage, but still don't know how to use it，special don't know how to write the funtion void callback( ). I hope someone could tell me how to write and use it more ...
cros
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3
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How to keep a class "alive" (...and passing the same NodeHandle)?
Hi,
here the minimal example I could create to explain a problem with my program which is splitted into 2 classes. One class creates an istance of the second one:
Let's start with the main file:
...
Andromeda
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1
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1
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using simple timers in ROS - doesn't show up in rqt
I am on ROS Hydro (with Catkin). I made a node with a C++ timer, with the following code;
...
Arkapravo
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1
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2
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Periodic long pauses between rospy.Timer callback calls
I have a Python node that contains a class similar to this:
...
Jim Rothrock
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1
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1
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What am i doing wrong with ros::timer in rqt?
Hello,
i have some problems with making the ros::timer work. Usually if i need a timer within a class i add these three lines to the header:
...
Blizzard
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29
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How do I reset a rospy Timer?
How do I reset a rospy Timer? I want to have a Python node that sends out a message like cmd_vel as a step function to test a controller, but I also want to use ...
- 1,396
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ROS Answers SE migration: timer callback
Hello, all,
Been searching for a while but I figured I'd ask directly.
What are the pros/cons of using rate.sleep() to control loop frequency versus using a timer callback?
From what I have gathered ...
alexalspach
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1
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5
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timing function for while loop
I was just wondering, if I want to write a while loop which says while x seconds hasn't reach execute this statement, how would I go about it?
I tried using
while(ros::Duration(x).sleep()){
....
}
but ...
Arash
0
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1
answer
10
views
Problem with ros::Timer
Hello
I have trouble creating a timer in Ros. I defined a class in which one of its members is the timer callback. To create it, in the constructor of the class I put the following:
...
g.aterido
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2
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4
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Intermittent subscription to a topic with/without timer possible?
Hello,
It is really important for me to know this before I start any coding. Here is what I want:
A continuous stream of data is being published as a topic. (At frequency >= 50Hz).
I want to read ...
Nishant
0
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1
answer
6
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Threading function - udp client integration to a Ros node
Hi,
I have working ROS node with callBacks for subscriptions, and also with timers like this:
...
ajr_
0
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1
answer
18
views
Ros::Timer, will stopping it with .stop() cause its counter to restart?
Hello,
If I declare a basic timer like this:
ros::Timer my_timer = nh.createTimer(ros::Duration(1), callback);
And then I stop it like this (say, 0.5 seconds later)...
gavinmachine
0
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3
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2
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Timer callbacks not working
Previously working timers in some of my packages/nodes have stopped working. The roscpp_tutorials/Tutorials/Timers example doesn't work either as the timer callbacks never execute. The program aborts ...
Bart