Pause Autonomy

Pause the currently running autonomy action.

• Service Name: autonomy/pause

• Service Type: std_srvs/srv/SetBool

Python

from clearpath_config.common.utils.yaml import read_yaml
import rclpy
from rclpy.node import Node
from std_srvs.srv import SetBool

ROBOT_CONFIG_PATH = '/etc/clearpath/robot.yaml'
LOGGING_NAME = 'PauseAutonomy'


class PauseAutonomy(Node):

    def __init__(self, namespace: str):
        super().__init__('pause_autonomy_client')
        self._autonomy_pause_client = self.create_client(SetBool, f'/{namespace}/autonomy/pause')

        while not self._autonomy_pause_client.wait_for_service(timeout_sec=2.0):
            self.get_logger().info(f'[{LOGGING_NAME}] /{namespace}/autonomy/pause service not available, waiting again...')

    def pause(self):
        req = SetBool.Request()
        req.data = True
        self.future = self._autonomy_pause_client.call_async(req)
        self.future.add_done_callback(self.autonomy_pause_srv_response_cb)

    def autonomy_pause_srv_response_cb(self, future):
        try:
            response = future.result()
            if response.success:
                self.get_logger().info(f'[{LOGGING_NAME}] Autonomy paused!')
            else:
                self.get_logger().error(f'[{LOGGING_NAME}] Failed to pause autonomy')
        except Exception as e:
            self.get_logger().error(f'[{LOGGING_NAME}] Service call failed: {e}')

        self.destroy_node()
        rclpy.shutdown()


def main(args=None):
    rclpy.init(args=args)
    robot_config = read_yaml(ROBOT_CONFIG_PATH)
    namespace = robot_config['system']['ros2']['namespace']

    pause_autonomy_client = PauseAutonomy(namespace)
    pause_autonomy_client.pause()

    rclpy.spin(pause_autonomy_client)


if __name__ == '__main__':
    main()

C++

#include "rclcpp/rclcpp.hpp"
#include "std_srvs/srv/set_bool.hpp"

#include <chrono>
#include <cstdlib>
#include <memory>
#include <yaml-cpp/yaml.h>

using namespace std::chrono_literals;

int main(int argc, char **argv)
{
  rclcpp::init(argc, argv);
  
  YAML::Node robot_config = YAML::LoadFile("/etc/clearpath/robot.yaml");
  std::string namespace_ = robot_config["system"]["ros2"]["namespace"].as<std::string>();

  std::shared_ptr<rclcpp::Node> node = rclcpp::Node::make_shared("pause_autonomy_client");
  rclcpp::Client<std_srvs::srv::SetBool>::SharedPtr client =
    node->create_client<std_srvs::srv::SetBool>("/" + namespace_ + "/" + std::string("autonomy/pause"));

  auto request = std::make_shared<std_srvs::srv::SetBool::Request>();
  request->data = true;

  while (!client->wait_for_service(2s)) {
    if (!rclcpp::ok()) {
      RCLCPP_ERROR(rclcpp::get_logger("pause_autonomy_client"), "Interrupted while waiting for the service. Exiting.");
      return 0;
    }
    RCLCPP_INFO(rclcpp::get_logger("pause_autonomy_client"), "/%s/autonomy/pause service not available, waiting again...", namespace_.c_str());
  }

  auto result = client->async_send_request(request);

  // Wait for the result.
  if (rclcpp::spin_until_future_complete(node, result) ==
    rclcpp::FutureReturnCode::SUCCESS)
  {
    if (result.get()->success)
    {
      RCLCPP_INFO(rclcpp::get_logger("pause_autonomy_client"), "Autonomy paused!");
    }
    else
    {
      RCLCPP_ERROR(rclcpp::get_logger("pause_autonomy_client"), "Autonomy failed to pause!");
    }
  } else {
    RCLCPP_ERROR(rclcpp::get_logger("pause_autonomy_client"), "Failed to call service /%s/autonomy/pause", namespace_.c_str());
  }

  rclcpp::shutdown();
  return 0;
}