But when I try to use rosbag2 to play and remap topics, the command line can't recognize my input for "--ros-args -r chatter:=demo". However, as far as I can tell the feature has not been back-ported to the eloquent branch so far. In the mean time this function has been added to rosbag2 (see PR #388). So if you need this you might need to build rosbag2 from source (including the PR mentioned above). The act of replacing one name with another is remapping. The gazebo_ ros2 _control plugin remaps everything into the namespace in which a model is spawned. As all nodes launch in the global namespace, this in effect "pushes it down" into a child namespace. I am successfully remapping topic in my applications when doing this on ros2_control_node. If a node publishes on "topic1", then you can make it publish on "topic2" instead, without having to change the code of the node. Error with local costmap / nav2_controller. Now, when this node subscribes to topic /different_topic, the remapping makes it actually subscribe to topic /needed_topic. ROS 2 Remapping Use cases These use cases are being considered for remapping in ROS 2: Remap One Node in a Process Change a Namespace The second part is the replacement for a matched name. Output or input topic remapping for joy_node or teleop_twist_joy_node not working, Running multiple Turtlebot3 - adding namespaces (ROS2- Eloquent), rosbag2 doesn't record turtlebot3 scan messages, ros2 transient_local durability (late joiners policy) does not work when using ros2 topic echo, [ROS2 Eloquent] TF2 listeners occasionally prevent receiving msgs, Creative Commons Attribution Share Alike 3.0. "Pushing Down" The ROS_NAMESPACE environment variable lets you change the namespace of a node that is being launched, which effectively remaps all of the names in that node. We commented the "__ns:=" remap flag that goes into arguments that goes into global context. Remapping a topic means that you'll change the topic name at run-time. The latter is destroyed shortly after controller is started. The various ROS libraries provide client support for easily stripping remapping arguments out of your own argument parsing. Is there any ideas of playing bags with remapped topics? How to remap topic in a ROS2 launch file? roslaunch remap ROS Topic remap publish topic remap subscribe from publish topic remap publish topic remap As you can see the launch file we created (demo.launch.py) is a Python file. In ROS 2, this interface had to become more complex to cope with a larger set of configuration options, an ambiguity in remapping rules and parameter assignment syntax (as a result of the leading underscore name convention for hidden resources), a one-to-many relationship between executables and nodes, to name a few. First things first, let's understand why. Ros2 supoport remap topics in command line. [ROS2] Rewrite bag with header timestamps, ros2:eloquent: how can I remap teleop topic for gazebo dolly. However, I need to remap the /cmd_vel topic. Creating your wrapper. With this changes, that are already in the latest ROS foxy release, you can now remap topics when playing bagfiles as: Please start posting anonymously - your entry will be published after you log in or create a new account. manage complexity through composition of simpler systems (launch files) allow including of other launch files. This could be accomplished by adding the following line to the launch file: <remap from="/different_topic" to="/needed_topic"/>. With this changes, that are already in the latest ROS foxy release, you can now remap topics when playing bagfiles as: ros2 bag play my_bagfile --remap old_topic:=new_topic link add a comment Your Answer This parameter is a ROS remapping rule to map those names to the actual, maybelline fit me foundation made in which country, pokemon sword and shield trade bot discord, 2. ros2 launch using IncludeLaunchDescription and remapping topics [closed] galactic launch IncludeLaunchDescription remap asked Jan 25 '22 jeremya 235 16 25 31 To re-use other packages in the ROS2 ecosystem, it's often advantageous to directly re-use the launch files provided with a package by using IncludeLaunchDescription. We saw that this affects any other gazebo ros plugin in a second model being spawned, resulting in name duplications all over, not only ros-controls wise. 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So if you need this you might need to build rosbag2 from source (including the PR mentioned above). Remapping rules have two parts. ROSRemap , JK-Cool 9728 1.< remap > < remap > . You can use XML instead if you want to, but with Python it will be easier to add logic. Setup code Remap the ROS topic With command line In a launch file Namespaces The talker will publish on the /chatter topic, and the . [closed] foxy ros2 launchfile remap asked Apr 22 '21 g.bardaro 110 7 12 16 Hi everyone, I am setting up a navigation2 launch file. Here we'll simply start the talker/listener example from the official ROS2 demos. I have used this one as a reference, and everything seems to work. Why remapping a ROS topic? The first part is used to determine if the rule applies to a name. Controller's nodes are created from ros2_control_node and not from spawner.py. In your first post, it appears to me that you are remapping topic on the wrong node. So, anyone publishing to /needed_topic ends up getting their message to this new node as well! Write your first ROS2 launch file. The launch system in ROS 2 will: convert common ROS concepts like remapping and changing the namespace into appropriate command line arguments and configurations for nodes so the user doesn't have to do so. 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