No stdout logging output in ROS2 using launch

edit

Hi all,

I am unable to see any logging output from stdout when using ros2 launch, and I need some help figuring out what's going on / if this is expected. For example this cpp file:

int main(int argc, char** argv)
{
  rclcpp::init(argc, argv);
  auto node = std::make_shared<rclcpp::Node>("a_test_node");

  RCLCPP_DEBUG(node->get_logger(), "test log debug");
  RCLCPP_INFO(node->get_logger(), "test log info");
  RCLCPP_WARN(node->get_logger(), "test log warn");
  RCLCPP_ERROR(node->get_logger(), "test log error");

  rclcpp::spin(node);

  return 0;
}

and this launch file:

import launch
import launch_ros.actions

def generate_launch_description():
    return launch.LaunchDescription([
        launch_ros.actions.Node(
            package='test_pkg',
            node_executable='test_node',
            node_name='test_node',
            output={
                'stdout': 'screen',
                'stderr': 'screen',
            }
        ),
    ])

only outputs:

jlangsfeld@swri-jlangsfeld-thinkpad-T560:~/Workspaces/ros2$ ros2 launch test_pkg log_test.launch.py
[INFO] [launch]: All log files can be found below /home/jlangsfeld/.ros/log/2019-09-11-13-45-19-657412-swri-jlangsfeld-thinkpad-T560-18153
[INFO] [launch]: Default logging verbosity is set to INFO
[INFO] [test_node-1]: process started with pid [18163]
[test_node-1] [WARN] [test_node]: test log warn
[test_node-1] [ERROR] [test_node]: test log error

I've tried other output options too with no luck. For example, using own_log for both stdout and stderr means separate log files are created but the stdout one always is completely empty. Any thoughts / suggestions?

Thanks, Josh