example_assisted_teleop.py

#! /usr/bin/env python3
# Copyright 2022 Joshua Wallace
#
# 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 time import sleep
 
from geometry_msgs.msg import PoseStamped
from nav2_simple_commander.robot_navigator import BasicNavigator
import rclpy
 
"""
Basic navigation demo to go to pose.
"""
 
 
def main() -> None:
    rclpy.init()
 
    navigator = BasicNavigator()
 
    # Set our demo's initial pose
    initial_pose = PoseStamped()
    initial_pose.header.frame_id = 'map'
    initial_pose.header.stamp = navigator.get_clock().now().to_msg()
    initial_pose.pose.position.x = 0.0
    initial_pose.pose.position.y = 0.0
    initial_pose.pose.orientation.z = 0.0
    initial_pose.pose.orientation.w = 1.0
    navigator.setInitialPose(initial_pose)
 
    # Wait for navigation to fully activate, since autostarting nav2
    navigator.waitUntilNav2Active()
 
    teleop_task = navigator.assistedTeleop(time_allowance=20)
    while not navigator.isTaskComplete(task=teleop_task):
        # Publish twist commands to be filtered by the assisted teleop action
        sleep(0.2)
        pass
 
    navigator.lifecycleShutdown()
    exit(0)
 
 
if __name__ == '__main__':
    main()