transforms.launch.py

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# Copyright (C) 2022 LEIDOS.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
 
from launch import LaunchDescription
from launch_ros.actions import Node
from carma_ros2_utils.launch.get_current_namespace import GetCurrentNamespace
from launch.substitutions import LaunchConfiguration
from launch.actions import DeclareLaunchArgument
 
import os
 
 
def generate_launch_description():
    """
    Launch robot_state_publisher to read in URDF file
    """
    use_sim_time = LaunchConfiguration('use_sim_time')
    declare_use_sim_time_arg = DeclareLaunchArgument(
        name = 'use_sim_time',
        default_value = "False",
        description = "True if simulation mode is on"
    )
 
    # Since the file needs to be actually read a substition does not work here
    # For now the path must be hardcoded so it can be read into a string and passed as a parameter
    with open('/opt/carma/vehicle/calibration/urdf/carma.urdf', 'r') as in_file:
        robot_description = in_file.read()
 
    start_robot_state_publisher_cmd = Node(
        package='robot_state_publisher',
        executable='robot_state_publisher',
        name='robot_state_publisher',
        namespace=GetCurrentNamespace(),
        parameters=[
            {'robot_description': robot_description},
            {"use_sim_time" : use_sim_time}
            ]
    )
 
    return LaunchDescription([
        start_robot_state_publisher_cmd,
        declare_use_sim_time_arg
    ])