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Inquiry on how to use MoveBaseActionGoal with Turtlebot2

asked 2022-02-01 21:50:14 -0600

distro gravatar image

Im trying to use the code below to move my turtlebot to goals inside of my map as a test.

#!/usr/bin/python3
import rospy
import actionlib       # Use the actionlib package for client and server

from move_base_msgs.msg import MoveBaseAction, MoveBaseGoal

GoalPoints = [ [(-1.06042258242,-0.438168283892, 0.0), (0.0, 0.0, 0.940821633704, 0.338902129758)],
[(-0.360606235518,0.964747030027, 0.0), (0.0, 0.0, 0.494397065335, 0.869236182972)]]


def assign_goal(pose):

    goal_pose = MoveBaseGoal()
    goal_pose.target_pose.header.frame_id = 'map'
    goal_pose.target_pose.pose.position.x = pose[0][0]
    goal_pose.target_pose.pose.position.y = pose[0][1]
    goal_pose.target_pose.pose.position.z = pose[0][2]
    goal_pose.target_pose.pose.orientation.x = pose[1][0]
    goal_pose.target_pose.pose.orientation.y = pose[1][1]
    goal_pose.target_pose.pose.orientation.z = pose[1][2]
    goal_pose.target_pose.pose.orientation.w = pose[1][3]

    return goal_pose


if __name__ == '__main__':
    rospy.init_node('MoveTBtoGoalPoints')
    # Create a SimpleActionClient of a move_base action type and wait for server.
    client = actionlib.SimpleActionClient('move_base', MoveBaseAction)
    client.wait_for_server()

    #
    for TBpose in GoalPoints:
        TBgoal = assign_goal(TBpose)  # For each goal point assign pose
        client.send_goal(TBgoal)
        success = client.wait_for_result(rospy.Duration(900))
    #        client.wait_for_result()

    if success:
        # if (client.get_state() == GoalStatus.SUCCEEDED):
        rospy.loginfo("success")
    else:
        rospy.loginfo("failed")

This is what I get in my terminal where I launched my roslaunch turtlebot_navigation amcl_demo.launch map_file:=/home/turtlebot/mymap2.yaml.

    [ WARN] [1643772990.930868465]: Clearing costmap to unstuck robot (3.000000m).
    [ WARN] [1643772996.130840366]: Rotate recovery behavior started.
    [ WARN] [1643773009.481429243]: Clearing costmap to unstuck robot (1.840000m).
    [ WARN] [1643773014.681199480]: Rotate recovery behavior started.
    [ERROR] [1643773028.031572793]: Aborting because a valid plan could not be found. Even after executing all recovery behaviors
    [ WARN] [1643773033.265505642]: Clearing costmap to unstuck robot (3.000000m).
    [ WARN] [1643773038.465451459]: Rotate recovery behavior started.

[ WARN] [1643773051.815918846]: Clearing costmap to unstuck robot (1.840000m).
[ WARN] [1643773057.015864710]: Rotate recovery behavior started.
[ERROR] [1643773070.316353760]: Aborting because a valid plan could not be found. Even after executing all recovery behaviors

The turtlebot simply rotates when the code is run and I get a "suceeded" message as well when clearly the robot ahs completely failed to move anywhere. I need help figuring out what's going on.

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answered 2022-02-03 17:33:58 -0600

distro gravatar image

updated 2022-02-03 17:35:02 -0600

@ljaniec I have messed around with parameters and nothing has helped.if you perhaps have a turtlebot2 could you please try these parameters yourself? I have them here: @ljaniec I have messed around with parameters and nothing has helped.if you perhaps have a turtlebot2 could you please try these parameters yourself? I have them here:

DWAPlannerROS:

# Robot Configuration Parameters - Kobuki
  max_vel_x: 0.22  # 0.55
  min_vel_x: 0.0 

  max_vel_y: 0.0  # diff drive robot
  min_vel_y: 0.0  # diff drive robot

  max_trans_vel: 0.15 # choose slightly less than the base's capability,0.5
  min_trans_vel: 0.1  # this is the min trans velocity when there is negligible rotational velocity
  trans_stopped_vel: 0.1

  # Warning!
  #   do not set min_trans_vel to 0.0 otherwise dwa will always think translational velocities
  #   are non-negligible and small in place rotational velocities will be created.

  max_rot_vel: 2.0  # choose slightly less than the base's capability,5.0
  min_rot_vel: 0.4  # this is the min angular velocity when there is negligible translational velocity
  rot_stopped_vel: 0.4

  acc_lim_x: 1.0 # maximum is theoretically 2.0, but we 
 acc_lim_theta: 2.0
  acc_lim_y: 0.0      # diff drive robot

# Goal Tolerance Parameters
  yaw_goal_tolerance: 0.4  # 0.05,0.3
  xy_goal_tolerance: 0.3  # 0.10,0.15
  # latch_xy_goal_tolerance: false

# Forward Simulation Parameters
  sim_time: 1.0       # 1.7,1.0
  vx_samples: 20     # 3
  vy_samples: 1       # diff drive robot, there is only one sample
  vtheta_samples: 40  # 20

# Trajectory Scoring Parameters
  path_distance_bias: 34.0      # 32.0,64.0   - weighting for how much it should stick to the global path plan
  goal_distance_bias: 64.0      # 24.0,34.0   - wighting for how much it should attempt to reach its goal
  occdist_scale: 0.01            # 0.01   - weighting for how much the controller should avoid obstacles,0.5
  forward_point_distance: 0.325 # 0.325  - how far along to place an additional scoring point
  stop_time_buffer: 0.2         # 0.2    - amount of time a robot must stop in before colliding for a valid traj.
  scaling_speed: 0.25           # 0.25   - absolute velocity at which to start scaling the robot's footprint
  max_scaling_factor: 0.2       # 0.2    - how much to scale the robot's footprint when at speed.

# Oscillation Prevention Parameters
  oscillation_reset_dist: 0.05  # 0.05   - how far to travel before resetting oscillation flags

# Debugging
  publish_traj_pc : true
  publish_cost_grid_pc: true
  global_frame_id: odom


# Differential-drive robot configuration - necessary?
#  holonomic_robot: false

costmap_common_params.yaml:

max_obstacle_height: 0.60  # assume something like an arm is mounted on top of the robot

# Obstacle Cost Shaping (http://wiki.ros.org/costmap_2d/hydro/inflation)
robot_radius: 0.20  # distance a circular robot should be clear of the obstacle (kobuki 0.18)
# footprint: [[x0, y0], [x1, y1], ... [xn, yn]]  # if the robot is not circular

map_type: voxel

obstacle_layer:
  enabled:              true
  max_obstacle_height:  0.6
  origin_z:             0.0
  z_resolution:         0.2
  z_voxels:             2
  unknown_threshold:    15
  mark_threshold:       0
  combination_method:   1
  track_unknown_space:  true    #true needed for disabling global path planning through unknown space
  obstacle_range: 2.5
  raytrace_range: 3.0
  origin_z: 0.0
  z_resolution: 0.2
  z_voxels: 2
  publish_voxel_map: false
  observation_sources:  scan bump
  scan:
    data_type: LaserScan
    topic: scan
    marking: true
    clearing ...
(more)
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answered 2022-02-02 10:15:20 -0600

ljaniec gravatar image

Read carefully this guide to ROS Navigation tuning:

https://kaiyuzheng.me/documents/navgu...

It will explain you a lot of parameters of ROS Navigation stack.

I think that the rotations you have observed are a part of 6 Recovery behaviors:

6 Recovery Behaviors

An annoying thing about robot navigation is that the robot may get stuck. Fortunately, the navigation stack has recovery behaviors built-in. Even so, sometimes the robot will exhaust all available recovery behaviors and stay still. Therefore, we may need to figure out a more robust solution.

Types of recovery behaviors ROS navigation has two recovery behaviors. They are clear costmap recovery and rotate recovery. Clear costmap recovery is basically reverting the local costmap to have the same state as the global costmap. Rotate recovery is to recover by rotating 360 degrees in place.

image description

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Comments

@ljaniec Thanks I'll study it as it's just good to know regardless and will definitely help my general understanding. However, when I use 2D Nav Goal provided by RVIZ to set goals for the robot, it doesn't get stuck or need to recover. With my code I assumed I was using the same topics that 2D Nav Goal publishes to. It just isnt clear to me why my code gives me this issue but using 2D Nav Goal doesnt.

distro gravatar image distro  ( 2022-02-02 17:33:55 -0600 )edit

I would check through ROS CLI what (and where) messagges are sent with the RViz and compare it to your code. Are you sure that your messages are built correctly? Is initial pose correct? Is real robot in correct place at the start of your tests? Did your code for assigning goals come from some checked sources? The ROS Wiki suggest this tutorial for ROS Navigation with TurtleBot, can you read it and compare to your code?

ljaniec gravatar image ljaniec  ( 2022-02-06 09:34:56 -0600 )edit

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Asked: 2022-02-01 21:50:14 -0600

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Last updated: Feb 03 '22