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Questions tagged [ros2]

Use this tag for questions related to ROS (Robot Operating System) version 2.

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Where is the log file in ROS 2.0

I install ROS 2.0 in my computer, and run the demo programs. But I can not find the log file. Where is the log file in ROS 2.0? I know the default position in ROS 1.0 is ~/.ros. Originally posted by ...
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Prerequisites for ROS

I'm going to start learning ROS but before I start, I'll learn python. What should I learn in python? I don't have any experience in Linux or ubunto. What do I need to know? I found many versions of ...
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ROS2 or ROS alternative or evolution

ROS2 will replace ROS or will the two platforms exist? Originally posted by mag.rod on ROS Answers with karma: 58 on 2018-02-13 Post score: 0
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Dockerized ROS2 development environment

Is there a sandboxed development environment for ROS2? (The/one ROS1 equivalent: rosdocked ) I identified 3 different use cases with potentially different docker Images: ROS2 core package development ...
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Partitions Settings in ROS2

Hello, I ported a RWM for RTI Connext Micro DDS. This DDS does not support partitions. However ROS2 uses partitions for the topics (rt) and other messages in the RMW. https://github.com/ros2/design/...
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catkin_ws/devel/setup.bash: No such file or directory

Each time I open terminal I get this message ...
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catkin_make: catkin_pkg.package not found (anaconda)

I am unable to solve this problem. I tried to run catkin_make command in catkin_ws directory. ...
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SystemC processor in Gazebo/ROS?

I have to work on a drone which will be controlled by a given processor. I have a SystemC version of the processor, and I'd like to use it to simulate the control of the drone. I was wondering if this ...
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package or stack wiki for ROS2

Is there any guideline about how to create 3rd party package or stack wiki for ROS2? For ROS1, contributors are free to create such wiki pages under http://wiki.ros.org (e.g. RealSense ), but not sure ...
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How can I run two ROS2 nodes each in a separate docker container?

I would like to run two ROS2 nodes, let's say listener and talker from the demo_nodes_cpp ...
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Are ROS2 messages guaranteed to be received by a Subscriber in the same order they were published?

According to https://github.com/ros2/ros2/wiki/About-Quality-of-Service-Settings it's possible to vary the QoS settings of History, Depth, Reliability and Durability. However, I can't find any mention ...
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[ros2] ros2 run [package] [executable] cannot find executable

I have a C++ project which consists of a number of packages that I'm migrating from ROS1 to ROS2; under ROS1 with catkin, I could build the project with catkin_make ...
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[ros2/rclcpp] Threadsafety of Node::create_publisher<>

I can't find any documentation of whether or not creating and working with nodes is threadsafe in rclcpp. My specific use case is that I would like to create node A <- In thread 1 rclcpp::spin(A) &...
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`builtin_interfaces` package location

According to the Migration Guide, in ROS2 the types duration and time which were builtin types in ROS 1 have been replaced with normal message definitions and must be used from the builtin_interfaces ...
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Ubuntu which command find nothing

In ROS 2.0 tutorial : Using ament to build a custom package: Create an overlay It says that we can use Ubuntu command which to see the path before and after we source ~/ros2_overlay_ws/install/...
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can ament package depend on catkin package

Is there any clean way of having an ament package depend on a catkin package if, say, their workspaces are different but maybe the ament workspace is an overlay on the catkin workspace? The main ...
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ROS2 ament overlay issue with messages

I'm working on adding array parameter support for ROS2, and am having trouble with ament. I've added new types and values here and here. I then sourced ...
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Packages available in ros2

Is there a list of available packages for ros2 yet? I'm tasked with evaluating how many of our current dependencies are available in ros2 and haven't been able to find a distribution list as is ...
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ros2 roscd feature

I do not found an equivalent to roscd in ros2. Is it implemented ? Does ament support that feature ? Originally posted by Vincent R on ROS Answers with karma: 365 on 2017-12-11 Post score: 2
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ImportError while installing ROS2 from source

I followed the instructions for installing ROS2 from source (from github wiki). Isolated and non-isolated build: ...
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Minimal ROS2 Python package

How looks the structure and the content of a plain ROS2 library level package? The intent of the package is to encapsulate functionality implemented in Python which can be imported into other ROS2 ...
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ROS2: subscription/service/timer callbacks not being called

TL;DR: rclcpp::Node-inheriting class registers some subscribers, services and a timer in its constructor; not a single callback is being called (apparently). ...
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[ROS2] using native RTI dds *.idl files with ROS2

Hi, I'm wondering if there is an efficient way or best-practice on how to use existing RTI dds idl descriptions with ROS2. Since we have a complete legacy system running with RTI dds, it would be ...
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Integrate sensor_msgs with ros 2?

I want to create a pub-sub using sensor_msgs in ros 2? Is there tutorial showing how to do this ? Originally posted by Skyking on ROS Answers with karma: 151 on 2017-09-25 Post score: 0
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Issues with ament CmakeLists

Hello All, I just started out with ROS 2.0. I have the latest build. I am unsure if I am doing something stupid or missing out something. However, I can’t build these simple files. If I should have ...
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[ROS2] generating DDS .idl files from .msg ROS Message Format

Hi all, I'm trying to create .idl descriptions from the ros message description format. There is the rosidl_generate_dds_interfaces package and cmake macro. How ...
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How can I run ROS2 nodes in a debugger (e.g. gdb)?

Is there something like the --prefix argument from rosrun in ros2 (see #q222530)? Originally posted by Andre Volk on ROS Answers with karma: 775 on 2017-07-24 Post ...
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ROS2: VCS error while updating source checkout

I successfully installed ROS 2 beta 2 from source following this page. Today I tried to update my local ROS 2 source files. I followed the instructions on this page, but vcs gives me an error for each ...
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Does ROS2 require Python3?

In the ROS2 beta install I saw it required pip3. Originally posted by DrBot on ROS Answers with karma: 147 on 2017-07-09 Post score: 0
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Is ROS2 going to support Python 3 and C++14?

My main question is in the title. If these languages versions are not going to be supported, what are there the main reasons that prevent it from happening? What would be the libraries that are only ...
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How to build ros1_bridge in ros2 with locally defined messages

The instructions for building ros1_bridge in ros2 says "The bridge will be built with support for any message/service packages that are on your path and have an associated mapping between ROS 1 ...
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What does "rcl" in ros2 stand for?

In ros2, the C++ include paths is something like: #include "rclcpp/rclcpp.hpp" and the python import looks like: ...
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What are the main changes (improvements) in ROS2?

Hi ros developers, I am using ROS for gazebo simulations, algorithms implementation, communication with robots. I also used it with arduino. I think current versions almost can do anything. But what ...
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ROS 2 Alpha 2 ros1_bridge using DDS between two computers

Has anyone tried the ROS 2 Alpha 2 ros1_bridge (i.e. dynamic_bridge)? Have you tried it between two computers? In my case, I'd like to use the dynamic bridge on an Ubuntu machine with ROS1 nodes. I'd ...
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Install problem with ros2

When I attempt to install the prerequisites (OSRF sources for DDS) on the ros2 install I find a key problem. For example, when I type: sudo apt-key adv --keyserver ha.pool.sks-keyservers.net --recv-...
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ros2 rttest example build error

hi, i try to use https://github.com/ros2/rttest , but when i want to build the examples, it returns errors when running make: ...
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Building Ros 2.0 without OpenCV?

I'd like to build Ros 2.0 without having to have OpenCV installed. Is this possible / How would I do this? Originally posted by Sam101 on ROS Answers with karma: 11 on 2015-09-11 Post score: 1
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Problem Installing ROS2

Hi, I have just tried to install ROS2 but I have this error when I compile the ros2 bridge: ImportError: dynamic module does not define init function (PyInit__roslz4) I am using the script: src/ament/...
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ROS2: content-based topic subscriptions?

Seeing as ROS2 will be using DDS as its middleware of choice, I was wondering if it would also support content filtered topic subscriptions next to the normal (ROS1) topic subscriptions. Being able to ...
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Is the planned ROS1 to ROS2/DDS bridge available yet?

I understand that part of the plan for ROS2 is to support mixed ROS1/ROS2 systems by implementing a bridge module that translates/republishes ROS1 (TCPROS or UDPROS) messages to ROS2 (DDS) and vice ...
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Is there a release date of ros 2 or more informations about it?

Hello everybody! I just want to know, if there are more informations than these at desing.ros2.org. Is there a release date? Is there a community discussing about it? I just found the presentation at ...
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