Questions tagged [subscribe]

Question 1

I am working with the FAST-LIO SLAM algorithm for my system: https://github.com/hku-mars/FAST_LIO. I cloned the repo, and I am using it with ROS2 Humble. I then downloaded the sample ROS bag (2020-09-...

Question 2

Tuesday Tangle I was wondering what can be the optimum way to solve the following. (Not even sure if it affects the system performance. I am not worried about the delays and other factors, just ...

Question 3

I want to implement and action server that uses data received from a topic subscription callback. In order to achieve it, I had to add ...

Question 4

I installed docker in my remote device which is RPI (raspian as OS) to make it able to run ros2 humble in it. I pulled the humble-rose-base. I started the container ...

Question 5

I'm writing a micro-ROS subscriber for the sensor_msgs/msg/Joy message type, running on an ESP32 board. I'm trying to display characters on the serial monitor of the Arduino IDE in response to the ...

Question 6

I would like to modify the message posted by the publisher directly from the subscriber side. So I tried the following method: pass reference to modify directly on subscriber side, but it doesn't ...

Question 7

I am using the nav2 api which calls for me to create a node and not use rclpy.spin() on it, because inside some of their ...

Question 8

I have an rclcpp node with some message data coming in (images, scans, etc). I would like to apply temporal filtering to this data, and therefore store a copy of each incoming message. I assumed ...

Question 9

I want to do parallel process of multiple subscriptions in a single callback. I have been looking for information, but there is barely any information regarding this in ROS 2 Humble. I found callback ...

Question 10

"Reading data from subscription without executing callback" is considered to be one of the common use cases of ROS 2. However, I wonder why there is less description about this use case in ...

Question 11

I try to use x and y in timer_callback function but I get ‘x’ was not declared in this scope I don't know how can I do this ...

Question 12

I use Ubuntu 20.04 and Ros2 Galactic when I run the code I'm able to get subscribe information and pub this information and also I can see publisher information on topic echo continuously but when I ...

Question 13

I wanted to know if rclpy supports intraprocess communication or is there a way to do intraprocess in rclpy with python based libraries? Thanks,

Question 14

Setup: a publisher in c++ of std_msgs/msg/Float32 sends the maximum float-32bits (using std::numeric_limits::max()) a subcriber in c++ to the topic above works just fine a subcriber in python to the ...

Question 15

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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Questions tagged [subscribe]

fast_lio_mapping node (FAST-LIO) not subscribing to IMU and LiDAR topics (ROS2 Humble)

Optimum way to do multiple (similar) msg subscrition in multiple nodes?

Implementing topic callback and action callback in ROS2

Unable to subscribe topic from ( ros2 + docker ) in remote device

How to subscribe Joy topic with micro-ROS on ESP32

Do subscribers in ROS2 have to subscribe to the same data types as publishers?

using action client and subscriber in the same script

ROS2 rclcpp subscriber callback uses same shared_ptr for each new message

Multiple subscriptions in a single callback

Read topic message from subscription without executing callback

Calling ROS2 subscriber callback function from another function

C++ Publisher and Subscriber in ROS2

Does rclpy supports intraprocess communication?

Subscriber in python to std_msgs.msg.Float32 crashes when the maximum float-32bits is sent

Subscribe to geometry_msgs/TransformStamped (tf) Message with message_filters ApproximateTime subscriber

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