Smoother Server

Source code on Github.

The Smoother Server implements the server for handling smooth path requests and hosting a vector of plugins implementing various C++ smoothers. The server exposes an action interface for smoothing with multiple smoothers that share resources such as costmaps and TF buffers.

Smoother Server Parameters

costmap_topic

Type	Default
string	“global_costmap/costmap_raw”

Description

Raw costmap topic for collision checking.

footprint_topic

Type	Default
string	“global_costmap/published_footprint”

Description

Topic for footprint in the costmap frame.

transform_tolerance

Type	Default
double	0.1

Description

TF transform tolerance.

action_server_result_timeout

Type	Default	Unit
double	10.0	seconds

Description

The timeout value (in seconds) for action servers to discard a goal handle if a result has not been produced. This used to default to 15 minutes in rcl but was changed to 10 seconds in this PR #1012, which may be less than some actions in Nav2 take to run. For most applications, this should not need to be adjusted as long as the actions within the server do not exceed this deadline. This issue has been raised with OSRF to find another solution to avoid active goal timeouts for bookkeeping, so this is a semi-temporary workaround

robot_base_frame

Type	Default
string	“base_link”

Description

Robot base frame.

smoother_plugins

Type	Default
vector<string>	{“nav2_smoother::SimpleSmoother”}

Description

List of plugin names to use, also matches action server names.

Note

Each plugin namespace defined in this list needs to have a plugin parameter defining the type of plugin to be loaded in the namespace.

Example:

smoother_server:
  ros__parameters:
    smoother_plugins: ["simple_smoother", "curvature_smoother"]
    curvature_smoother:
      plugin: "nav2_ceres_costaware_smoother/CeresCostawareSmoother"
    simple_smoother:
      plugin: "nav2_smoother::SimpleSmoother"

Example

smoother_server:
  ros__parameters:
    costmap_topic: global_costmap/costmap_raw
    footprint_topic: global_costmap/published_footprint
    robot_base_frame: base_link
    transform_timeout: 0.1
    smoother_plugins: ["simple_smoother"]
    simple_smoother:
      plugin: "nav2_smoother::SimpleSmoother"
      tolerance: 1.0e-10
      do_refinement: True