demo.launch.py

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import os
import yaml
from launch import LaunchDescription
from launch.actions import DeclareLaunchArgument
from launch.substitutions import LaunchConfiguration
from launch.conditions import IfCondition, UnlessCondition
from launch_ros.actions import Node
from launch.actions import ExecuteProcess
from ament_index_python.packages import get_package_share_directory
import xacro
 
 
def load_file(package_name, file_path):
    package_path = get_package_share_directory(package_name)
    absolute_file_path = os.path.join(package_path, file_path)
 
    try:
        with open(absolute_file_path, "r") as file:
            return file.read()
    except EnvironmentError:  # parent of IOError, OSError *and* WindowsError where available
        return None
 
 
def load_yaml(package_name, file_path):
    package_path = get_package_share_directory(package_name)
    absolute_file_path = os.path.join(package_path, file_path)
 
    try:
        with open(absolute_file_path, "r") as file:
            return yaml.safe_load(file)
    except EnvironmentError:  # parent of IOError, OSError *and* WindowsError where available
        return None
 
 
def generate_launch_description():
 
    # planning_context
    robot_description_config = xacro.process_file(
        os.path.join(
            get_package_share_directory("moveit_resources_prbt_support"),
            "urdf",
            "prbt.xacro",
        )
    )
    robot_description = {"robot_description": robot_description_config.toxml()}
 
    robot_description_semantic_config = xacro.process_file(
        os.path.join(
            get_package_share_directory("moveit_resources_prbt_moveit_config"),
            "config",
            "prbt.srdf.xacro",
        )
    )
 
    robot_description_semantic = {
        "robot_description_semantic": robot_description_semantic_config.toxml()
    }
 
    joint_limits_yaml = load_yaml(
        "moveit_resources_prbt_moveit_config", "config/joint_limits.yaml"
    )
    pilz_cartesian_limits_yaml = load_yaml(
        "moveit_resources_prbt_moveit_config", "config/pilz_cartesian_limits.yaml"
    )
    robot_description_planning = {
        "robot_description_planning": {
            **joint_limits_yaml,
            **pilz_cartesian_limits_yaml,
        }
    }
    kinematics_yaml = load_yaml(
        "moveit_resources_prbt_moveit_config", "config/kinematics.yaml"
    )
    robot_description_kinematics = {"robot_description_kinematics": kinematics_yaml}
 
    # Planning Functionality
    planning_pipelines_config = {
        "default_planning_pipeline": "ompl",
        "planning_pipelines": ["pilz", "ompl"],
        "pilz": {
            "planning_plugin": "pilz_industrial_motion_planner/CommandPlanner",
            "request_adapters": "",
            "start_state_max_bounds_error": 0.1,
        },
        "ompl": {
            "planning_plugin": "ompl_interface/OMPLPlanner",
            "request_adapters": """default_planner_request_adapters/AddTimeOptimalParameterization default_planner_request_adapters/FixWorkspaceBounds default_planner_request_adapters/FixStartStateBounds default_planner_request_adapters/FixStartStateCollision default_planner_request_adapters/FixStartStatePathConstraints""",
            "start_state_max_bounds_error": 0.1,
        },
    }
    ompl_planning_yaml = load_yaml(
        "moveit_resources_prbt_moveit_config", "config/ompl_planning.yaml"
    )
    planning_pipelines_config["ompl"].update(ompl_planning_yaml)
 
    # Trajectory Execution Functionality
    moveit_simple_controllers_yaml = load_yaml(
        "moveit_resources_prbt_moveit_config", "config/prbt_controllers.yaml"
    )
    moveit_controllers = {
        "moveit_simple_controller_manager": moveit_simple_controllers_yaml,
        "moveit_controller_manager": "moveit_simple_controller_manager/MoveItSimpleControllerManager",
    }
 
    trajectory_execution = {
        "moveit_manage_controllers": True,
        "trajectory_execution.allowed_execution_duration_scaling": 1.2,
        "trajectory_execution.allowed_goal_duration_margin": 0.5,
        "trajectory_execution.allowed_start_tolerance": 0.01,
    }
 
    planning_scene_monitor_parameters = {
        "publish_planning_scene": True,
        "publish_geometry_updates": True,
        "publish_state_updates": True,
        "publish_transforms_updates": True,
    }
 
    # Start the actual move_group node/action server
    run_move_group_node = Node(
        package="moveit_ros_move_group",
        executable="move_group",
        output="screen",
        parameters=[
            robot_description,
            robot_description_semantic,
            robot_description_kinematics,
            robot_description_planning,
            planning_pipelines_config,
            trajectory_execution,
            moveit_controllers,
            planning_scene_monitor_parameters,
        ],
    )
 
    # RViz
    rviz_base = os.path.join(
        get_package_share_directory("moveit_resources_prbt_moveit_config"), "launch"
    )
    rviz_full_config = os.path.join(rviz_base, "moveit.rviz")
    rviz_node = Node(
        package="rviz2",
        executable="rviz2",
        name="rviz2",
        output="log",
        arguments=["-d", rviz_full_config],
        parameters=[
            robot_description,
            robot_description_semantic,
            robot_description_planning,
            robot_description_kinematics,
            planning_pipelines_config,
        ],
    )
 
    # Static TF
    static_tf = Node(
        package="tf2_ros",
        executable="static_transform_publisher",
        name="static_transform_publisher",
        output="log",
        arguments=["0.0", "0.0", "0.0", "0.0", "0.0", "0.0", "world", "prbt_link0"],
    )
 
    # Publish TF
    robot_state_publisher = Node(
        package="robot_state_publisher",
        executable="robot_state_publisher",
        name="robot_state_publisher",
        output="both",
        parameters=[robot_description],
    )
 
    # ros2_control using FakeSystem as hardware
    ros2_controllers_path = os.path.join(
        get_package_share_directory("moveit_resources_prbt_moveit_config"),
        "config",
        "prbt_ros_controllers.yaml",
    )
    ros2_control_node = Node(
        package="controller_manager",
        executable="ros2_control_node",
        parameters=[robot_description, ros2_controllers_path],
        output="screen",
    )
 
    joint_state_broadcaster_spawner = Node(
        package="controller_manager",
        executable="spawner",
        arguments=[
            "joint_state_broadcaster",
            "--controller-manager",
            "/controller_manager",
        ],
    )
 
    prbt_arm_controller_spawner = Node(
        package="controller_manager",
        executable="spawner",
        arguments=[
            "panda_joint_group_position_controller",
            "-c",
            "/controller_manager",
        ],
    )
 
    # Warehouse mongodb server
    mongodb_server_node = Node(
        package="warehouse_ros_mongo",
        executable="mongo_wrapper_ros.py",
        parameters=[
            {"warehouse_port": 33829},
            {"warehouse_host": "localhost"},
            {"warehouse_plugin": "warehouse_ros_mongo::MongoDatabaseConnection"},
        ],
        output="screen",
    )
 
    return LaunchDescription(
        [
            rviz_node,
            static_tf,
            robot_state_publisher,
            run_move_group_node,
            ros2_control_node,
            joint_state_broadcaster_spawner,
            prbt_arm_controller_spawner,
            mongodb_server_node,
        ]
    )