In this blog post, I’ll share some things I’ve learned about Platform.sh, how I was able to deploy my first Node.js application, and a few features that I think could be improved. Using event handlers 1 Event handlers example launch file Ĭreate a new file called example_event_handlers_launch.py file in the launch folder of the launch_tutorial package.įrom launch_ros.actions import Node from launch import LaunchDescription from launch.actions import ( DeclareLaunchArgument, EmitEvent, ExecuteProcess, LogInfo, RegisterEventHandler, TimerAction ) from nditions import IfCondition from launch.event_handlers import ( OnExecutionComplete, OnProcessExit, OnProcessIO, OnProcessStart, OnShutdown ) from launch.events import Shutdown from launch.Hey friends, I recently joined Platform.sh as a Developer Relations Engineer, and I’ve been playing with the platform for a few weeks now. This tutorial extends the code shown in the Using substitutions in launch files tutorial. This tutorial also assumes you have created a new package of build type ament_python called launch_tutorial. This tutorial uses the turtlesim package. This tutorial shows usage examples of event handlers in ROS 2 launch files. These changes are called events and can be handled by registering an event handler with the launch system.Įvent handlers can be registered for specific events and can be useful for monitoring the state of processes.Īdditionally, they can be used to define a complex set of rules which can be used to dynamically modify the launch file. It is responsible for monitoring the state of processes it launched, as well as reporting and reacting to changes in the state of those processes. Launch in ROS 2 is a system that executes and manages user-defined processes. ROS 2 Technical Steering Committee Charter.Using ros1_bridge with upstream ROS on Ubuntu 22.04.Visualizing ROS 2 data with Foxglove Studio.Working with multiple ROS 2 middleware implementations.Passing ROS arguments to nodes via the command-line.Migrating YAML parameter files from ROS 1 to ROS 2.Using ROS 2 launch to launch composable nodes.Using Python, XML, and YAML for ROS 2 Launch Files.Migrating launch files from ROS 1 to ROS 2.Building a package with Eclipse 2021-06.Creating a content filtering subscription.Recording and playing back data with rosbag using the ROS 1 bridge.Setting up efficient intra-process communication.
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