Questions tagged [message-filters]

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ROS2 message_filters: Is it a bug in The Latest Time synchronizer?

In message_filters/include/message_filters/sync_policies/latest_time.h rates_ is array of ...
chenhao wu's user avatar
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ROS2 message filters

I'm trying to figure out how to use message filters in ROS2 galactic in python. From this example https://github.com/ros2/message_filters/blob/rolling/test/test_approxsync.py I see that ...
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Not getting any output with python message_filter ApproximateTimeSynchronizer

I am trying to project 3d bounding box detected on a point cloud data to Image. I am using message filters to subscribe to image and detection topic. when I run the node i get the debug message on ...
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#Windows# Issue with tf2_ros::MessageFilter Tutorial on Windows

I am a beginner with ROS 2 and I was following the Using stamped datatypes with tf2_ros::MessageFilter tutorial on a Windows machine. I have encountered an issue in the 3 Run section. When I run ...
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Subscribe to geometry_msgs/TransformStamped (tf) Message with message_filters ApproximateTime subscriber

I am trying to use a message_filters::sync::ApproximateTime subscriber in a C++ node that must subscribe to 2 custom messages (which have a Header each), nav_msgs/OccupancyGrid Message, and a tf/...
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ROS2 callback not called with approximate time synchronizer

Any idea, why my callback is not called ? ...
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How to add a header with timestamp to numpy_msg?

I am using the rospy with numpy tutorial to create a publisher and subscriber that send numpy arrays to listener that uses an ApproximateTimeSynchronizer. However, I receive an error when I try to ...
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ROS2: How to synchronize two topics with message_filters and a defined QoS

I try to synchronize two ROS2 topic using message_filter (sync_policies/approximate_time): a sensor_msgs::msgs::Imu from an Imu a sensor_msgs::msgs::PointCloud2 from a radar, which is published with ...
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Template errors creating Approximate Time Synchroniser

Compiler: gcc9.4.0 Arch: Ubuntu20.04/AMD64 ROS Galactic I'm struggling still to compile a node using an approximate time sync from two topics. I've attempted to closely follow the method used by ...
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1 answer
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Compilation issues with PCL and message_filters: ; cannot bind non-const lvalue

Compiler: gcc9.4.0 Arch: Ubuntu20.04/AMD64 PCL: 1.10 ROS Galactic I've got two errors which I believe are hindering me from compiling my code here successfully. The first is affecting my attempt to ...
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Where does message "Message Filter dropping message" comes from

I'm trying to debug find the root cause that generate this kind of error messages: ...
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ROS2 message_filters Synchronizer compilation error

Hi, I am having trouble compiling my code using the message_filters Synchronizer in ROS2 Foxy. The tests included in the library compile and run fine but the code below does not want to compile on ...
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nh.subscribe works but message_filters::Subscriber not

I'm trying to learn the ROS topic, but I met a problem that really confused me. Here is the origin code. It works well, I can receive the image and pass it to ...
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1 answer
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[ROS2 galactic] message_filters: undefined symbol: _ZN15message_filters10ConnectionC1ERKSt8functionIFvvEE

Hi there. Recently, I'm trying to combine two string messages and use message_filters::TimeSynchronizer to synchronize the two message. I have written the minimal ...
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1 answer
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ApproximateTimeSynchronizer publishes in_sync topics through the callback?

Hello everyone. I am trying to synchronize topics with the use of message_filters and ApproximateTimeSynchronizer. I subscribe to the topics that I want to synchronize but when I examine them they don'...
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Message filter headerless warning with custom message type

I generated my custom message as following: uint32 num_object nav_msgs/Odometry custom This is a part of the output when echoing a topic using my custom message: <...
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Messages being dropped by IRIS Lama Node using YD Lidar Laser Scanner

Hi, I am trying to use Iris Lama slam package with YD Lidar to create grid map. I am using following commands to run slam and lidar node ( Launch files also attached) Lidar Launch File : ...
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How to create topics and synchronize them when recording a bagfile

Hello everyone, thanks for taking the time to check my post. So let me describe what I want to do. For starters I have a bag file containing a topic which carries a directory path at each message, ...
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message_filters in C++ not subscribing to topics when implemented in a class

Hi all, I am having some issues with message filters, but I am not sure if I am doing something wrong or if there is a bug somewhere. After some difficulties, I decided to implement a couple of ...
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ROS 2 message_filters TimeSynchronizer minimal example does not reach callback function

Description I am trying to get the message_filters::TimeSynchronizer to work on my Linux Ubuntu 18.04 (Linux version 5.4.0-54-generic) and wrote a minimal node, according to other entries in this ...
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1 answer
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What is 'slop' in ApproximateTimeSynchronizer?

I'm going through the message filters in ros noetic and came across the following class. ...
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message_filter synchronize boolean msg

Hello I want to add a boolean msg in my synchronizer but it seems that BoolConstPtr definition in the callback function is not working. Here is my class and callback dsefiniton. ...
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2 answers
220 views

Using C++ message filters in ROS2

I am trying to subscribe to two topics. If their header stamps are equal they should be combined into a single message and published. I believe that an exact_time message_filter is the way to go here. ...
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1 answer
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Subscribe to two PointCloud2 messages using message_filters

I was trying to synchronize between two PointCloud2 messages, following these tutorials. But I was not able to compile the following piece of code: ...
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1 answer
50 views

ROS2 Message filters in a class, initializing message_filters::Subscriber object

I am trying to sync two message streams of 2 image topics. So I am using message filters. I was using a class to do all this, however, the member initialisation doesn't work for me for message_filters:...
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ApproximateTime not working with nodelets

Hi, I have a nodelet that publishes a few topics and another nodelet that subscribes the topics and republishes a custom topic with all the synchronized messages. If I start the two nodelets in two ...
Myzhar's user avatar
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I have an error "AttributeError: 'module' object has no attribute 'ApproximateTimeSynchronizer'" even if i already used TimeSynchronizer

System information OS: Ubuntu 12.07 ROS version: Hydro this the code i just create to be able to use two topics at the same time: ...
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message_filters with PoseStamped

Hello, I want to use message_filters on different msg types aswell as my custom msgs later on.. But it does not seem to work with PoseStamped. Marker and PointCloud2 together work. I made sure that ...
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Hi, I want to use the message filter in this example , I tried to register callback from a class member function as in the following code:

...
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I have an error trying to subscribe to multiple topics, between them there are two of the same type, this is the error, please what can I do?

this is the code: ...
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1 answer
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How to match messages coming from several nodes to be able to cross-reference data based on timestamps?

Hello, I was wondering whether it is possible to cache two synced messages with message_filters API in Melodic? I got two synced messages: ...
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1 answer
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Access Cache Data Error

Based on the code I have written for question #Q335276, when I try to use the Cache methods, they weren't there. I am not sure why I am getting the error message as shown below: ...
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1 answer
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message_filter (Python 3) not working in ROS Melodic

System information OS: Ubuntu 18.04 ROS version: Melodic Conda environment: python=3.7 (Needed for a python3 processing module) Problem explanation I try to create a message filter that subscribes ...
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1 answer
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Message_filters TimeSequencer compile error

Dear all, I am trying to use the TimeSequencer filter of the message_filters library to introduce a delay to a certain topic. I have created a simple example following the documentation on http://wiki....
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1 answer
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Error "Call to publish() on an invalid Publisher" using ApproximateTime Policy

Hi everyone, I try to use the ApproximateTime Policy-Based Synchronizer to get the force and position data from a force sensor and NDI, the code is show here which imitated from #q297174, in this code,...
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1 answer
6 views

Asynchronous message filter does not subscribe to remapped nodelet topics

I'm using a custom made package that uses nodelets for RGBD image processing. The end of the processing pipeline is a nodelet ...
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1 answer
24 views

ROS 2: Message Filters (e.g. exact time)

Potentially looking to move to ROS 2.0 for python 3 support in a new project. Question I can't seem to find an answer too, is the feature of sync'ing messages working in ROS 2.0 yet? Is there an ...
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2 votes
3 answers
61 views

message_filters doesn't call the callback function

I'm trying to use the message_filters in order to subscribe to two topics. Here's my code ...
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1 answer
7 views

How to subcribe both Image topic and Text topic in the same time?

Hi buddy, I am newbie in ROS. And this is the first time i'm trying to subcribe 2 topics type, 1 for Image topic and 1 for Array of ints topic. And i have a problem on it. This is my source code: <...
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1 answer
27 views

Problem with message_filters::cache

#include "ros/ros.h" #include "ros/message_traits.h" #include "message_filters/subscriber.h" #include "message_filters/cache.h" #include "std_msgs/String.h&...
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1 answer
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Where should I indeed place my "ros::spin()"?

I am a freshman for ROS, and I find a interesting (for me) thing: I wrote a node, for example, let's call it my_node.cpp, it looks like this: ...
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1 vote
1 answer
10 views

Unsubscribe a message_filters.ApproximateTimeSynchronizer

I have a subscriber setup to subscribe to three topics simultaneously (using message_filters). i want to stop this subscriber. Unfortunately, there is no mention of any "unregister" function ...
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1 answer
2 views

Huge error message from boost using time_synchronizer

This is the modified example code of the message_filters package ...
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1 answer
3 views

sensor fusion of 2 Points using message_filters

Hey there, I would like to write a nod that does some sensor fusion. The node should subscribe 2 Topics of type geometry_msgs::Point if the two messages have the approximate same time_stamp simple the ...
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2 answers
9 views

topic remapping in synchronised message_filters

I am trying to synchronise a compressed depth image and its camera info: ...
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1 answer
4 views

fuzz testing for message filters?

Message filter is one of the important components in ROS, which monitors data from different sources and do the synchronization via registered callback functions, is there any exiting fuzz testing ...
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1 answer
18 views

roscpp message_filters Synchronizer.registerCallback problem

Hi, For the example of message filter in this example , I tried to register callback from a class member function as in the following code: ...
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1 answer
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Compile error creating message_filter with std_msgs/String

Hi, Based on https://wiki.ros.org/message_filters#Time_Synchronizer I am trying to subscribe a node on two topics. I made two of the talker nodes like in https://wiki.ros.org/ROS/Tutorials/...
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2 answers
52 views

Synchronizer with approximate time policy in a class [C++]

I have been trying to implement a synchronizer with approximate time policy in a class. The following code compiles with no problem. But how should I define the ...
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1 answer
4 views

How to configure Time sequence message filter

Hello, I want to use time sequence message filter. I wrote the code according to API defined here Link This is my code void callback(const std_msgs::StringConstPtr& info) { ROS_INFO("Call is ...
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