diff --git a/jetson/ros2_ws/src/saltybot_bringup/launch/nav2.launch.py b/jetson/ros2_ws/src/saltybot_bringup/launch/nav2.launch.py
index 0505fdc..c73862a 100644
--- a/jetson/ros2_ws/src/saltybot_bringup/launch/nav2.launch.py
+++ b/jetson/ros2_ws/src/saltybot_bringup/launch/nav2.launch.py
@@ -1,76 +1,139 @@
"""
nav2.launch.py — Nav2 autonomous navigation stack for SaltyBot
-Starts the full Nav2 navigation stack (controllers, planners, behavior server,
-BT navigator, velocity smoother, lifecycle managers).
+Supports two localization modes via the 'nav_mode' argument:
-Localization is provided by RTAB-Map (slam_rtabmap.launch.py must be running):
- /map — OccupancyGrid (static global costmap layer)
- /rtabmap/odom — Odometry (velocity smoother + controller feedback)
- TF map→odom — published by RTAB-Map
+ nav_mode:=slam (default)
+ Uses RTAB-Map for odometry and live map building.
+ Requires slam_rtabmap.launch.py to be running.
+ Sources: /rtabmap/odom (pose), /map (from RTAB-Map)
-Output:
- /cmd_vel — consumed by saltybot_bridge → STM32 over UART
+ nav_mode:=amcl
+ Uses VESC CAN odometry (/odom) + AMCL on a pre-built static map.
+ Launches: sensors, VESC odometry bridge, map_server, AMCL, Nav2 stack.
+ Sources: /odom (VESC CAN IDs 61/79), /scan (RPLIDAR)
+ Map: saltybot_nav2_slam maps/saltybot_map.yaml (override with map:=...)
-Profile Support (Issue #506)
-────────────────────────────
- Supports profile-based parameter overrides via 'profile' launch argument:
- profile:=indoor — conservative (0.2 m/s, tight geofence, aggressive inflation)
- profile:=outdoor — moderate (0.5 m/s, wide geofence, standard inflation)
- profile:=demo — agile (0.3 m/s, tricks enabled, enhanced obstacle avoidance)
+ nav_mode:=slam profile support (Issue #506)
+ profile:=indoor — conservative (0.2 m/s, tight geofence)
+ profile:=outdoor — moderate (0.5 m/s)
+ profile:=demo — agile (0.3 m/s, tricks enabled)
Run sequence on Orin:
- 1. docker compose up saltybot-ros2 # RTAB-Map + sensors
- 2. docker compose up saltybot-nav2 # this launch file
+ # SLAM mode (existing behaviour):
+ ros2 launch saltybot_bringup nav2.launch.py
+
+ # AMCL mode with saved map:
+ ros2 launch saltybot_bringup nav2.launch.py nav_mode:=amcl \
+ map:=/mnt/nvme/saltybot/maps/my_map.yaml
"""
import os
+
from ament_index_python.packages import get_package_share_directory
from launch import LaunchDescription
-from launch.actions import DeclareLaunchArgument, IncludeLaunchDescription, LogInfo
+from launch.actions import (
+ DeclareLaunchArgument,
+ GroupAction,
+ IncludeLaunchDescription,
+ LogInfo,
+)
+from launch.conditions import LaunchConfigurationEquals
from launch.launch_description_sources import PythonLaunchDescriptionSource
from launch.substitutions import LaunchConfiguration
-def generate_launch_description():
- nav2_bringup_dir = get_package_share_directory('nav2_bringup')
- bringup_dir = get_package_share_directory('saltybot_bringup')
+def generate_launch_description() -> LaunchDescription:
+ nav2_bringup_dir = get_package_share_directory("nav2_bringup")
+ bringup_dir = get_package_share_directory("saltybot_bringup")
+ nav2_slam_dir = get_package_share_directory("saltybot_nav2_slam")
+
+ # ── Arguments ─────────────────────────────────────────────────────────────
+
+ nav_mode_arg = DeclareLaunchArgument(
+ "nav_mode",
+ default_value="slam",
+ choices=["slam", "amcl"],
+ description=(
+ "Localization mode. "
+ "slam: RTAB-Map live map (requires slam_rtabmap.launch.py running); "
+ "amcl: static map + AMCL particle filter + VESC odometry (Issue #655)."
+ ),
+ )
- # Profile argument (Issue #506)
profile_arg = DeclareLaunchArgument(
"profile",
default_value="indoor",
choices=["indoor", "outdoor", "demo"],
- description="Launch profile for parameter overrides (Issue #506)"
+ description="Nav2 parameter profile for slam mode (Issue #506)",
)
- profile = LaunchConfiguration('profile')
-
- nav2_params_file = os.path.join(bringup_dir, 'config', 'nav2_params.yaml')
- bt_xml_file = os.path.join(
- bringup_dir, 'behavior_trees', 'navigate_to_pose_with_recovery.xml'
+ map_arg = DeclareLaunchArgument(
+ "map",
+ default_value=os.path.join(nav2_slam_dir, "maps", "saltybot_map.yaml"),
+ description="Map YAML path for AMCL mode",
)
- nav2_launch = IncludeLaunchDescription(
- PythonLaunchDescriptionSource(
- os.path.join(nav2_bringup_dir, 'launch', 'navigation_launch.py')
- ),
- launch_arguments={
- 'use_sim_time': 'false',
- 'autostart': 'true',
- 'params_file': nav2_params_file,
- 'default_bt_xml_filename': bt_xml_file,
- # RTAB-Map publishes /map with transient_local QoS — must match
- 'map_subscribe_transient_local': 'true',
- }.items(),
+ use_sim_time_arg = DeclareLaunchArgument(
+ "use_sim_time",
+ default_value="false",
)
- profile_log = LogInfo(
- msg=['[nav2] Loaded profile: ', profile]
+ # ── Mode: SLAM (original behaviour — RTAB-Map + navigation_launch.py) ────
+
+ slam_nav2_params = os.path.join(bringup_dir, "config", "nav2_params.yaml")
+ slam_bt_xml = os.path.join(
+ bringup_dir, "behavior_trees", "navigate_to_pose_with_recovery.xml"
+ )
+
+ slam_mode = GroupAction(
+ condition=LaunchConfigurationEquals("nav_mode", "slam"),
+ actions=[
+ LogInfo(msg="[nav2] Mode: SLAM (RTAB-Map odometry + live map)"),
+ IncludeLaunchDescription(
+ PythonLaunchDescriptionSource(
+ os.path.join(nav2_bringup_dir, "launch", "navigation_launch.py")
+ ),
+ launch_arguments={
+ "use_sim_time": "false",
+ "autostart": "true",
+ "params_file": slam_nav2_params,
+ "default_bt_xml_filename": slam_bt_xml,
+ "map_subscribe_transient_local": "true",
+ }.items(),
+ ),
+ ],
+ )
+
+ # ── Mode: AMCL (static map + AMCL + VESC odometry, Issue #655) ───────────
+
+ amcl_mode = GroupAction(
+ condition=LaunchConfigurationEquals("nav_mode", "amcl"),
+ actions=[
+ LogInfo(msg="[nav2] Mode: AMCL (static map + VESC odometry, Issue #655)"),
+ IncludeLaunchDescription(
+ PythonLaunchDescriptionSource(
+ os.path.join(
+ nav2_slam_dir, "launch", "nav2_amcl_bringup.launch.py"
+ )
+ ),
+ launch_arguments={
+ "map": LaunchConfiguration("map"),
+ "use_sim_time": LaunchConfiguration("use_sim_time"),
+ # Sensors are already started by saltybot_bringup GROUP A
+ "include_sensors": "false",
+ }.items(),
+ ),
+ ],
)
return LaunchDescription([
+ nav_mode_arg,
profile_arg,
- profile_log,
- nav2_launch,
+ map_arg,
+ use_sim_time_arg,
+ LogInfo(msg=["[nav2] Loaded nav_mode=", LaunchConfiguration("nav_mode"),
+ " profile=", LaunchConfiguration("profile")]),
+ slam_mode,
+ amcl_mode,
])
diff --git a/jetson/ros2_ws/src/saltybot_nav2_slam/config/amcl_nav2_params.yaml b/jetson/ros2_ws/src/saltybot_nav2_slam/config/amcl_nav2_params.yaml
new file mode 100644
index 0000000..28c4a30
--- /dev/null
+++ b/jetson/ros2_ws/src/saltybot_nav2_slam/config/amcl_nav2_params.yaml
@@ -0,0 +1,331 @@
+# amcl_nav2_params.yaml — Complete Nav2 + AMCL parameter file (Issue #655)
+#
+# AMCL localises on a pre-built static map using /scan (RPLIDAR A1M8).
+# Odometry source: /odom from vesc_can_odometry (VESC CAN IDs 61/79, Issue #646).
+#
+# Launch with:
+# ros2 launch saltybot_nav2_slam nav2_amcl_bringup.launch.py
+# ros2 launch saltybot_nav2_slam nav2_amcl_bringup.launch.py \
+# map:=/mnt/nvme/saltybot/maps/my_map.yaml
+#
+# Costmaps (inline — required by nav2_bringup navigation_launch.py):
+# global: static_layer + obstacle_layer (LiDAR) + inflation_layer
+# local: obstacle_layer (LiDAR) + inflation_layer, 4m rolling window
+
+# ── AMCL ─────────────────────────────────────────────────────────────────────
+amcl:
+ ros__parameters:
+ use_sim_time: false
+
+ # Particle filter bounds
+ min_particles: 500
+ max_particles: 3000
+
+ # Motion model noise (alpha1–5: low = trust odometry more)
+ # Tuned for VESC differential drive (Issue #646): encoder slip ~5%
+ alpha1: 0.10 # rot noise from rot
+ alpha2: 0.10 # rot noise from trans
+ alpha3: 0.05 # trans noise from trans
+ alpha4: 0.05 # trans noise from rot
+ alpha5: 0.10 # (omni only)
+
+ # Sensor model — likelihood field
+ laser_model_type: "likelihood_field"
+ laser_likelihood_max_dist: 2.0
+ max_beams: 60
+ sigma_hit: 0.2
+ z_hit: 0.50 # beam hit weight
+ z_rand: 0.45 # random noise weight
+ z_max: 0.025 # max-range weight (z_hit+z_rand+z_max+z_short = 1.0)
+ z_short: 0.025 # short-read weight
+ sigma_short: 0.05
+ do_beamskip: false
+ beam_search_increment: 0.1
+
+ # Frame IDs
+ global_frame_id: "map"
+ odom_frame_id: "odom"
+ base_frame_id: "base_link"
+
+ # Update triggers
+ update_min_d: 0.20 # m — update after moving this far
+ update_min_a: 0.15 # rad — update after rotating this much
+ resample_interval: 1
+
+ # Particle filter convergence
+ pf_err: 0.05
+ pf_z: 0.99
+
+ # Transform
+ tf_broadcast: true
+ transform_tolerance: 0.5 # s — relaxed for slower Nav2 loop
+ save_pose_rate: 0.5 # Hz — save last pose for fast re-init
+
+ # Recovery particle injection (0 = disabled)
+ recovery_alpha_fast: 0.0
+ recovery_alpha_slow: 0.0
+
+ # Robot model
+ robot_model_type: "nav2_amcl::DifferentialMotionModel"
+
+ # Scan topic
+ scan_topic: /scan
+
+# ── Map Server ────────────────────────────────────────────────────────────────
+map_server:
+ ros__parameters:
+ use_sim_time: false
+ yaml_filename: "" # overridden by launch argument --map
+
+# ── BT Navigator ─────────────────────────────────────────────────────────────
+bt_navigator:
+ ros__parameters:
+ use_sim_time: false
+ global_frame: map
+ robot_base_frame: base_link
+ odom_topic: /odom
+ enable_groot_monitoring: false
+ default_nav_to_pose_bt_xml: >-
+ $(find-pkg-share nav2_bt_navigator)/behavior_trees/navigate_to_pose_w_replanning_and_recovery.xml
+ default_nav_through_poses_bt_xml: >-
+ $(find-pkg-share nav2_bt_navigator)/behavior_trees/navigate_through_poses_w_replanning_and_recovery.xml
+ plugin_lib_names:
+ - nav2_compute_path_to_pose_action_bt_node
+ - nav2_compute_path_through_poses_action_bt_node
+ - nav2_follow_path_action_bt_node
+ - nav2_spin_action_bt_node
+ - nav2_wait_action_bt_node
+ - nav2_back_up_action_bt_node
+ - nav2_drive_on_heading_bt_node
+ - nav2_clear_costmap_service_bt_node
+ - nav2_is_stuck_condition_bt_node
+ - nav2_goal_updated_condition_bt_node
+ - nav2_initial_pose_received_condition_bt_node
+ - nav2_reinitialize_global_localization_service_bt_node
+ - nav2_rate_controller_bt_node
+ - nav2_distance_controller_bt_node
+ - nav2_speed_controller_bt_node
+ - nav2_truncate_path_action_bt_node
+ - nav2_remove_passed_goals_action_bt_node
+ - nav2_goal_checker_selector_bt_node
+ - nav2_controller_selector_bt_node
+ - nav2_planner_selector_bt_node
+
+# ── Controller Server (DWB local planner) ─────────────────────────────────────
+controller_server:
+ ros__parameters:
+ use_sim_time: false
+ controller_frequency: 20.0
+ min_x_velocity_threshold: 0.001
+ min_y_velocity_threshold: 0.5
+ min_theta_velocity_threshold: 0.001
+ failure_tolerance: 0.3
+ progress_checker_plugin: "progress_checker"
+ goal_checker_plugins: ["general_goal_checker"]
+ controller_plugins: ["FollowPath"]
+
+ progress_checker:
+ plugin: "nav2_controller::SimpleProgressChecker"
+ required_movement_radius: 0.3
+ movement_time_allowance: 15.0
+
+ general_goal_checker:
+ stateful: true
+ plugin: "nav2_controller::SimpleGoalChecker"
+ xy_goal_tolerance: 0.20
+ yaw_goal_tolerance: 0.20
+
+ # DWB — tuned for VESC differential drive on Saltybot
+ FollowPath:
+ plugin: "dwb_core::DWBLocalPlanner"
+ debug_trajectory_details: false
+ min_vel_x: 0.0
+ min_vel_y: 0.0
+ max_vel_x: 1.0 # m/s — conservative indoor nav
+ max_vel_y: 0.0 # diff drive: no lateral
+ max_vel_theta: 1.5 # rad/s
+ min_speed_xy: 0.0
+ max_speed_xy: 1.0
+ min_speed_theta: 0.0
+ acc_lim_x: 2.0
+ acc_lim_y: 0.0
+ acc_lim_theta: 2.0
+ decel_lim_x: -2.0
+ decel_lim_theta: -2.0
+ vx_samples: 20
+ vy_samples: 1 # diff drive: no lateral
+ vtheta_samples: 40
+ sim_time: 1.7
+ linear_granularity: 0.05
+ angular_granularity: 0.025
+ transform_tolerance: 0.2
+ trans_stopped_velocity: 0.25
+ short_circuit_trajectory_evaluation: true
+ stateful: true
+ critics: ["RotateToGoal", "Oscillation", "BaseObstacle", "GoalAlign",
+ "PathAlign", "PathDist", "GoalDist"]
+ BaseObstacle.scale: 0.02
+ PathAlign.scale: 32.0
+ PathAlign.forward_point_distance: 0.1
+ GoalAlign.scale: 24.0
+ GoalAlign.forward_point_distance: 0.1
+ PathDist.scale: 32.0
+ GoalDist.scale: 24.0
+ RotateToGoal.scale: 32.0
+ RotateToGoal.slowing_factor: 5.0
+ RotateToGoal.lookahead_time: -1.0
+
+# ── Planner Server (NavFn A*) ─────────────────────────────────────────────────
+planner_server:
+ ros__parameters:
+ use_sim_time: false
+ expected_planner_frequency: 20.0
+ planner_plugins: ["GridBased"]
+ GridBased:
+ plugin: "nav2_navfn_planner/NavfnPlanner"
+ tolerance: 0.5
+ use_astar: true
+ allow_unknown: true
+
+# ── Behavior Server (recovery behaviors) ──────────────────────────────────────
+behavior_server:
+ ros__parameters:
+ use_sim_time: false
+ costmap_topic: local_costmap/costmap_raw
+ footprint_topic: local_costmap/published_footprint
+ cycle_frequency: 10.0
+ global_frame: odom
+ robot_base_frame: base_link
+ transform_timeout: 0.1
+ simulate_ahead_time: 2.0
+ behavior_plugins: ["spin", "backup", "wait"]
+ spin:
+ plugin: "nav2_behaviors/Spin"
+ backup:
+ plugin: "nav2_behaviors/BackUp"
+ wait:
+ plugin: "nav2_behaviors/Wait"
+ # Spin recovery
+ max_rotations: 2.0 # full rotations before giving up
+ # Backup recovery
+ max_backup_dist: 0.30 # m
+ backup_speed: 0.15 # m/s — slow for a balancing robot
+
+# ── Global Costmap ────────────────────────────────────────────────────────────
+# Uses /scan (RPLIDAR) for obstacle detection.
+# Layers: static (from /map) + obstacle (LiDAR) + inflation.
+global_costmap:
+ global_costmap:
+ ros__parameters:
+ use_sim_time: false
+ global_frame: map
+ robot_base_frame: base_link
+ update_frequency: 5.0 # Hz
+ publish_frequency: 2.0 # Hz
+ rolling_window: false
+ resolution: 0.05 # m/cell
+ robot_radius: 0.35 # m — inscribed circle
+ track_unknown_space: true
+ unknown_cost_value: -1
+ lethal_cost_threshold: 100
+ plugins: ["static_layer", "obstacle_layer", "inflation_layer"]
+ static_layer:
+ plugin: "nav2_costmap_2d::StaticLayer"
+ map_subscribe_transient_local: true
+ enabled: true
+ obstacle_layer:
+ plugin: "nav2_costmap_2d::ObstacleLayer"
+ enabled: true
+ observation_sources: scan
+ scan:
+ topic: /scan
+ data_type: "LaserScan"
+ max_obstacle_height: 2.0
+ min_obstacle_height: 0.0
+ obstacle_max_range: 9.5
+ obstacle_min_range: 0.0
+ raytrace_max_range: 10.0
+ raytrace_min_range: 0.0
+ clearing: true
+ marking: true
+ inflation_layer:
+ plugin: "nav2_costmap_2d::InflationLayer"
+ enabled: true
+ inflation_radius: 0.55 # m — clears obstacles wider than robot
+ cost_scaling_factor: 10.0
+ inflate_unknown: false
+ inflate_around_unknown: true
+
+# ── Local Costmap ─────────────────────────────────────────────────────────────
+# Rolling 4m window in odom frame. LiDAR obstacle layer + inflation.
+local_costmap:
+ local_costmap:
+ ros__parameters:
+ use_sim_time: false
+ global_frame: odom
+ robot_base_frame: base_link
+ update_frequency: 10.0 # Hz
+ publish_frequency: 5.0 # Hz
+ rolling_window: true
+ width: 4 # m
+ height: 4 # m
+ resolution: 0.05 # m/cell
+ robot_radius: 0.35
+ track_unknown_space: true
+ unknown_cost_value: 0 # treat unknown as free locally
+ lethal_cost_threshold: 100
+ plugins: ["obstacle_layer", "inflation_layer"]
+ obstacle_layer:
+ plugin: "nav2_costmap_2d::ObstacleLayer"
+ enabled: true
+ observation_sources: scan
+ scan:
+ topic: /scan
+ data_type: "LaserScan"
+ max_obstacle_height: 2.0
+ min_obstacle_height: 0.0
+ obstacle_max_range: 5.0
+ obstacle_min_range: 0.0
+ raytrace_max_range: 6.0
+ raytrace_min_range: 0.0
+ clearing: true
+ marking: true
+ observation_persistence: 0.0
+ expected_update_rate: 5.5 # RPLIDAR A1M8 scan rate
+ inflation_layer:
+ plugin: "nav2_costmap_2d::InflationLayer"
+ enabled: true
+ inflation_radius: 0.55
+ cost_scaling_factor: 10.0
+ inflate_unknown: false
+ inflate_around_unknown: false
+
+# ── Velocity Smoother ─────────────────────────────────────────────────────────
+velocity_smoother:
+ ros__parameters:
+ use_sim_time: false
+ smoothing_frequency: 20.0
+ scale_velocities: false
+ feedback: "OPEN_LOOP"
+ max_velocity: [1.0, 0.0, 1.5]
+ min_velocity: [-1.0, 0.0, -1.5]
+ max_accel: [2.0, 0.0, 2.0]
+ max_decel: [-2.0, 0.0, -2.0]
+ odom_topic: "odom"
+ odom_duration: 0.1
+ deadband_velocity: [0.0, 0.0, 0.0]
+ velocity_timeout: 1.0
+
+# ── Lifecycle Managers ────────────────────────────────────────────────────────
+lifecycle_manager_localization:
+ ros__parameters:
+ use_sim_time: false
+ autostart: true
+ node_names: ["map_server", "amcl"]
+
+lifecycle_manager_navigation:
+ ros__parameters:
+ use_sim_time: false
+ autostart: true
+ node_names: ["controller_server", "planner_server", "behavior_server",
+ "bt_navigator", "velocity_smoother"]
diff --git a/jetson/ros2_ws/src/saltybot_nav2_slam/launch/nav2_amcl_bringup.launch.py b/jetson/ros2_ws/src/saltybot_nav2_slam/launch/nav2_amcl_bringup.launch.py
new file mode 100644
index 0000000..d225d85
--- /dev/null
+++ b/jetson/ros2_ws/src/saltybot_nav2_slam/launch/nav2_amcl_bringup.launch.py
@@ -0,0 +1,188 @@
+"""
+nav2_amcl_bringup.launch.py — Nav2 with AMCL localization (Issue #655).
+
+Full autonomous navigation stack for SaltyBot using a pre-built static map
+and AMCL particle-filter localization.
+
+Odometry: /odom from vesc_can_odometry (VESC CAN IDs 61/79, Issue #646)
+LiDAR: /scan from RPLIDAR A1M8 (via saltybot_bringup sensors.launch.py)
+Map: static OccupancyGrid loaded by map_server (defaults to placeholder)
+
+Startup sequence
+────────────────
+ 1. Sensors — RealSense D435i + RPLIDAR A1M8 drivers + static TF
+ 2. VESC odometry — /odom (differential drive from dual CAN motors)
+ 3. Localization — map_server + AMCL (nav2_bringup localization_launch.py)
+ 4. Navigation — controller + planner + behaviors + BT navigator
+ (nav2_bringup navigation_launch.py)
+
+Arguments
+─────────
+ map path to map YAML (default: maps/saltybot_map.yaml placeholder)
+ use_sim_time (default: false)
+ autostart lifecycle manager autostart (default: true)
+ params_file Nav2 params override (default: config/amcl_nav2_params.yaml)
+ include_sensors launch sensors.launch.py (default: true — set false if
+ sensors are already running)
+
+Usage
+─────
+ # Minimal — sensors included, placeholder map:
+ ros2 launch saltybot_nav2_slam nav2_amcl_bringup.launch.py
+
+ # With a real saved map:
+ ros2 launch saltybot_nav2_slam nav2_amcl_bringup.launch.py \
+ map:=/mnt/nvme/saltybot/maps/my_map.yaml
+
+ # Without sensor bringup (sensors already running):
+ ros2 launch saltybot_nav2_slam nav2_amcl_bringup.launch.py \
+ include_sensors:=false
+
+Integration with saltybot_bringup
+──────────────────────────────────
+ The saltybot_bringup orchestrator (saltybot_bringup.launch.py) calls
+ nav2.launch.py at t=22 s in GROUP C. To use AMCL instead of RTAB-Map:
+ ros2 launch saltybot_bringup nav2.launch.py nav_mode:=amcl
+"""
+
+import os
+
+from ament_index_python.packages import get_package_share_directory
+
+from launch import LaunchDescription
+from launch.actions import (
+ DeclareLaunchArgument,
+ GroupAction,
+ IncludeLaunchDescription,
+ LogInfo,
+)
+from launch.conditions import IfCondition
+from launch.launch_description_sources import PythonLaunchDescriptionSource
+from launch.substitutions import LaunchConfiguration
+
+
+def generate_launch_description() -> LaunchDescription:
+ nav2_slam_dir = get_package_share_directory("saltybot_nav2_slam")
+ bringup_dir = get_package_share_directory("saltybot_bringup")
+ nav2_bringup_dir = get_package_share_directory("nav2_bringup")
+
+ default_map = os.path.join(nav2_slam_dir, "maps", "saltybot_map.yaml")
+ default_params = os.path.join(nav2_slam_dir, "config", "amcl_nav2_params.yaml")
+
+ # ── Launch arguments ──────────────────────────────────────────────────────
+
+ map_arg = DeclareLaunchArgument(
+ "map",
+ default_value=default_map,
+ description="Path to map YAML file (Nav2 map_server format)",
+ )
+
+ use_sim_time_arg = DeclareLaunchArgument(
+ "use_sim_time",
+ default_value="false",
+ description="Use simulated clock from /clock topic",
+ )
+
+ autostart_arg = DeclareLaunchArgument(
+ "autostart",
+ default_value="true",
+ description="Automatically start lifecycle nodes after launch",
+ )
+
+ params_file_arg = DeclareLaunchArgument(
+ "params_file",
+ default_value=default_params,
+ description="Path to Nav2 parameter YAML file",
+ )
+
+ include_sensors_arg = DeclareLaunchArgument(
+ "include_sensors",
+ default_value="true",
+ description="Launch sensors.launch.py (set false if sensors already running)",
+ )
+
+ # ── Substitutions ─────────────────────────────────────────────────────────
+
+ map_file = LaunchConfiguration("map")
+ use_sim_time = LaunchConfiguration("use_sim_time")
+ autostart = LaunchConfiguration("autostart")
+ params_file = LaunchConfiguration("params_file")
+ include_sensors = LaunchConfiguration("include_sensors")
+
+ # ── Sensor bringup (conditional) ─────────────────────────────────────────
+ # RealSense D435i + RPLIDAR A1M8 drivers + base_link→laser/camera_link TF
+
+ sensors_launch = GroupAction(
+ condition=IfCondition(include_sensors),
+ actions=[
+ LogInfo(msg="[nav2_amcl] Starting sensors (RealSense + RPLIDAR)"),
+ IncludeLaunchDescription(
+ PythonLaunchDescriptionSource(
+ os.path.join(bringup_dir, "launch", "sensors.launch.py")
+ ),
+ ),
+ ],
+ )
+
+ # ── VESC CAN odometry ────────────────────────────────────────────────────
+ # Differential drive from CAN IDs 61 (left) + 79 (right) → /odom + TF
+
+ odom_launch = IncludeLaunchDescription(
+ PythonLaunchDescriptionSource(
+ os.path.join(nav2_slam_dir, "launch", "odometry_bridge.launch.py")
+ ),
+ launch_arguments={"use_sim_time": use_sim_time}.items(),
+ )
+
+ # ── Localization: map_server + AMCL ──────────────────────────────────────
+ # Publishes: /map, TF map→odom (AMCL), /amcl_pose, /particlecloud
+
+ localization_launch = IncludeLaunchDescription(
+ PythonLaunchDescriptionSource(
+ os.path.join(nav2_bringup_dir, "launch", "localization_launch.py")
+ ),
+ launch_arguments={
+ "map": map_file,
+ "use_sim_time": use_sim_time,
+ "autostart": autostart,
+ "params_file": params_file,
+ "use_lifecycle_mgr": "true",
+ }.items(),
+ )
+
+ # ── Navigation: controller + planner + behaviors + BT navigator ──────────
+ # Subscribes: /odom, /scan, /map, /cmd_vel_nav (→ velocity_smoother → /cmd_vel)
+ # Provides: action servers for NavigateToPose + NavigateThroughPoses
+
+ navigation_launch = IncludeLaunchDescription(
+ PythonLaunchDescriptionSource(
+ os.path.join(nav2_bringup_dir, "launch", "navigation_launch.py")
+ ),
+ launch_arguments={
+ "use_sim_time": use_sim_time,
+ "autostart": autostart,
+ "params_file": params_file,
+ "map_subscribe_transient_local": "true",
+ "use_lifecycle_mgr": "true",
+ }.items(),
+ )
+
+ return LaunchDescription([
+ # Arguments
+ map_arg,
+ use_sim_time_arg,
+ autostart_arg,
+ params_file_arg,
+ include_sensors_arg,
+
+ # Banner
+ LogInfo(msg="[nav2_amcl] Nav2 AMCL bringup starting (Issue #655)"),
+
+ # Startup sequence
+ sensors_launch, # step 1 — sensors
+ odom_launch, # step 2 — /odom from VESC
+ LogInfo(msg="[nav2_amcl] Starting AMCL localization"),
+ localization_launch, # step 3 — map_server + AMCL
+ LogInfo(msg="[nav2_amcl] Starting Nav2 navigation stack"),
+ navigation_launch, # step 4 — full nav stack
+ ])
diff --git a/jetson/ros2_ws/src/saltybot_nav2_slam/maps/saltybot_map.pgm b/jetson/ros2_ws/src/saltybot_nav2_slam/maps/saltybot_map.pgm
new file mode 100644
index 0000000..5f71f78
--- /dev/null
+++ b/jetson/ros2_ws/src/saltybot_nav2_slam/maps/saltybot_map.pgm
@@ -0,0 +1,4 @@
+P5
+200 200
+255
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þ
\ No newline at end of file
diff --git a/jetson/ros2_ws/src/saltybot_nav2_slam/maps/saltybot_map.yaml b/jetson/ros2_ws/src/saltybot_nav2_slam/maps/saltybot_map.yaml
new file mode 100644
index 0000000..3d875be
--- /dev/null
+++ b/jetson/ros2_ws/src/saltybot_nav2_slam/maps/saltybot_map.yaml
@@ -0,0 +1,16 @@
+# SaltyBot placeholder map — 10m × 10m all free space at 0.05 m/cell.
+#
+# Replace with a real map saved by slam_toolbox or RTAB-Map:
+# ros2 run nav2_map_server map_saver_cli -f /mnt/nvme/saltybot/maps/my_map
+#
+# Then launch with:
+# ros2 launch saltybot_nav2_slam nav2_amcl_bringup.launch.py \
+# map:=/mnt/nvme/saltybot/maps/my_map.yaml
+
+image: saltybot_map.pgm
+mode: trinary
+resolution: 0.05 # m/cell — matches costmap resolution
+origin: [-5.0, -5.0, 0.0] # lower-left corner (x, y, yaw)
+negate: 0 # 0: white=free, black=occupied
+occupied_thresh: 0.65 # p ≥ 0.65 → lethal
+free_thresh: 0.25 # p ≤ 0.25 → free
diff --git a/jetson/ros2_ws/src/saltybot_nav2_slam/package.xml b/jetson/ros2_ws/src/saltybot_nav2_slam/package.xml
index 2e1ce41..88f91e9 100644
--- a/jetson/ros2_ws/src/saltybot_nav2_slam/package.xml
+++ b/jetson/ros2_ws/src/saltybot_nav2_slam/package.xml
@@ -4,9 +4,10 @@
saltybot_nav2_slam
0.1.0
- Nav2 SLAM integration for SaltyBot autonomous navigation.
- Combines SLAM Toolbox (RPLIDAR 2D SLAM), RealSense depth for obstacle avoidance,
- VESC odometry, and DWB planner for autonomous navigation up to 20km/h.
+ Nav2 SLAM + AMCL integration for SaltyBot autonomous navigation (Issues #422, #655).
+ Combines SLAM Toolbox (RPLIDAR 2D SLAM), VESC CAN differential-drive odometry
+ (Issue #646), AMCL particle-filter localization on static maps, DWB local planner,
+ NavFn A* global planner, RealSense depth costmap, and spin/backup/wait recovery.
sl-controls
MIT
@@ -20,6 +21,14 @@
tf2_ros
nav2_bringup
+ nav2_amcl
+ nav2_map_server
+ nav2_bt_navigator
+ nav2_controller
+ nav2_planner
+ nav2_behaviors
+ dwb_core
+ nav2_navfn_planner
slam_toolbox
rplidar_ros
realsense2_camera
diff --git a/jetson/ros2_ws/src/saltybot_nav2_slam/setup.py b/jetson/ros2_ws/src/saltybot_nav2_slam/setup.py
index ac86fea..0a472e9 100644
--- a/jetson/ros2_ws/src/saltybot_nav2_slam/setup.py
+++ b/jetson/ros2_ws/src/saltybot_nav2_slam/setup.py
@@ -14,6 +14,7 @@ setup(
"launch/nav2_slam_integrated.launch.py",
"launch/depth_to_costmap.launch.py",
"launch/odometry_bridge.launch.py",
+ "launch/nav2_amcl_bringup.launch.py",
]),
(f"share/{package_name}/config", [
"config/nav2_params.yaml",
@@ -23,6 +24,11 @@ setup(
"config/local_costmap_params.yaml",
"config/dwb_local_planner_params.yaml",
"config/vesc_odometry_params.yaml",
+ "config/amcl_nav2_params.yaml",
+ ]),
+ (f"share/{package_name}/maps", [
+ "maps/saltybot_map.yaml",
+ "maps/saltybot_map.pgm",
]),
],
install_requires=["setuptools"],
diff --git a/jetson/ros2_ws/src/saltybot_nav2_slam/test/test_nav2_amcl.py b/jetson/ros2_ws/src/saltybot_nav2_slam/test/test_nav2_amcl.py
new file mode 100644
index 0000000..c3d0471
--- /dev/null
+++ b/jetson/ros2_ws/src/saltybot_nav2_slam/test/test_nav2_amcl.py
@@ -0,0 +1,338 @@
+"""
+test_nav2_amcl.py — Unit tests for Nav2 AMCL integration (Issue #655).
+
+Tests run without a ROS2 installation:
+ - amcl_nav2_params.yaml: parse, required sections, value ranges
+ - saltybot_map.yaml: parse, required keys, valid geometry
+ - saltybot_map.pgm: valid PGM header, correct dimensions
+ - nav2_amcl_bringup.launch.py: import (syntax) test
+"""
+
+import os
+import struct
+
+import pytest
+import yaml
+
+# ── Paths ─────────────────────────────────────────────────────────────────────
+_PKG_ROOT = os.path.join(os.path.dirname(__file__), "..")
+_CFG = os.path.join(_PKG_ROOT, "config", "amcl_nav2_params.yaml")
+_MAP_YAML = os.path.join(_PKG_ROOT, "maps", "saltybot_map.yaml")
+_MAP_PGM = os.path.join(_PKG_ROOT, "maps", "saltybot_map.pgm")
+_LAUNCH = os.path.join(_PKG_ROOT, "launch", "nav2_amcl_bringup.launch.py")
+
+
+# ── amcl_nav2_params.yaml ─────────────────────────────────────────────────────
+
+def _load_params():
+ with open(_CFG) as f:
+ return yaml.safe_load(f)
+
+
+def test_params_file_exists():
+ assert os.path.isfile(_CFG)
+
+
+def test_params_top_level_sections():
+ params = _load_params()
+ required = [
+ "amcl",
+ "map_server",
+ "bt_navigator",
+ "controller_server",
+ "planner_server",
+ "behavior_server",
+ "global_costmap",
+ "local_costmap",
+ "velocity_smoother",
+ "lifecycle_manager_localization",
+ "lifecycle_manager_navigation",
+ ]
+ for section in required:
+ assert section in params, f"Missing section: {section}"
+
+
+def test_amcl_params_present():
+ amcl = _load_params()["amcl"]["ros__parameters"]
+ for key in ("min_particles", "max_particles", "alpha1", "alpha2",
+ "alpha3", "alpha4", "laser_model_type", "global_frame_id",
+ "odom_frame_id", "base_frame_id", "robot_model_type"):
+ assert key in amcl, f"Missing amcl param: {key}"
+
+
+def test_amcl_particle_bounds():
+ amcl = _load_params()["amcl"]["ros__parameters"]
+ assert amcl["min_particles"] >= 100
+ assert amcl["max_particles"] >= amcl["min_particles"]
+ assert amcl["max_particles"] <= 10000
+
+
+def test_amcl_frames():
+ amcl = _load_params()["amcl"]["ros__parameters"]
+ assert amcl["global_frame_id"] == "map"
+ assert amcl["odom_frame_id"] == "odom"
+ assert amcl["base_frame_id"] == "base_link"
+
+
+def test_amcl_motion_model():
+ amcl = _load_params()["amcl"]["ros__parameters"]
+ for key in ("alpha1", "alpha2", "alpha3", "alpha4"):
+ assert 0.0 <= amcl[key] <= 1.0, f"{key} out of [0,1]"
+
+
+def test_amcl_laser_model():
+ amcl = _load_params()["amcl"]["ros__parameters"]
+ assert amcl["laser_model_type"] in ("likelihood_field", "beam", "likelihood_field_prob")
+ z_sum = amcl["z_hit"] + amcl["z_rand"] + amcl["z_max"] + amcl["z_short"]
+ assert abs(z_sum - 1.0) < 1e-3, f"z weights sum {z_sum:.4f} ≠1.0"
+
+
+def test_controller_server_params():
+ ctrl = _load_params()["controller_server"]["ros__parameters"]
+ assert ctrl["controller_frequency"] > 0
+ follow = ctrl["FollowPath"]
+ assert follow["max_vel_x"] > 0
+ assert follow["max_vel_x"] <= 10.0 # sanity cap
+ assert follow["max_vel_theta"] > 0
+ assert follow["min_vel_y"] == 0.0 # differential drive: no lateral
+ assert follow["vy_samples"] == 1 # differential drive
+
+
+def test_planner_server_params():
+ planner = _load_params()["planner_server"]["ros__parameters"]
+ assert "GridBased" in planner["planner_plugins"]
+ grid = planner["GridBased"]
+ assert "NavfnPlanner" in grid["plugin"]
+ assert grid["use_astar"] is True
+
+
+def test_behavior_server_recoveries():
+ behaviors = _load_params()["behavior_server"]["ros__parameters"]
+ plugins = behaviors["behavior_plugins"]
+ # Issue #655 requires: spin, backup, wait
+ for required in ("spin", "backup", "wait"):
+ assert required in plugins, f"Recovery behavior '{required}' missing"
+ # Check each has a plugin entry
+ for name in plugins:
+ assert name in behaviors, f"behavior_plugins entry '{name}' has no config block"
+ assert "plugin" in behaviors[name]
+
+
+def test_global_costmap_layers():
+ gcm = _load_params()["global_costmap"]["global_costmap"]["ros__parameters"]
+ plugins = gcm["plugins"]
+ for layer in ("static_layer", "obstacle_layer", "inflation_layer"):
+ assert layer in plugins, f"Global costmap missing layer: {layer}"
+ # Each layer has plugin field
+ for layer in plugins:
+ assert layer in gcm, f"Layer {layer} has no config block"
+ assert "plugin" in gcm[layer]
+
+
+def test_global_costmap_scan_source():
+ gcm = _load_params()["global_costmap"]["global_costmap"]["ros__parameters"]
+ obs = gcm["obstacle_layer"]
+ assert "scan" in obs["observation_sources"]
+ assert obs["scan"]["topic"] == "/scan"
+ assert obs["scan"]["data_type"] == "LaserScan"
+
+
+def test_local_costmap_layers():
+ lcm = _load_params()["local_costmap"]["local_costmap"]["ros__parameters"]
+ plugins = lcm["plugins"]
+ # Local costmap: obstacle + inflation (no static — rolling window)
+ assert "obstacle_layer" in plugins
+ assert "inflation_layer" in plugins
+ assert lcm["rolling_window"] is True
+
+
+def test_local_costmap_size():
+ lcm = _load_params()["local_costmap"]["local_costmap"]["ros__parameters"]
+ assert lcm["width"] >= 2
+ assert lcm["height"] >= 2
+ assert lcm["resolution"] == pytest.approx(0.05, abs=1e-6)
+
+
+def test_costmap_frames():
+ gcm = _load_params()["global_costmap"]["global_costmap"]["ros__parameters"]
+ lcm = _load_params()["local_costmap"]["local_costmap"]["ros__parameters"]
+ assert gcm["global_frame"] == "map"
+ assert gcm["robot_base_frame"] == "base_link"
+ assert lcm["global_frame"] == "odom" # local uses odom frame
+ assert lcm["robot_base_frame"] == "base_link"
+
+
+def test_inflation_radius_larger_than_robot():
+ gcm = _load_params()["global_costmap"]["global_costmap"]["ros__parameters"]
+ lcm = _load_params()["local_costmap"]["local_costmap"]["ros__parameters"]
+ robot_r = gcm["robot_radius"]
+ g_infl = gcm["inflation_layer"]["inflation_radius"]
+ l_infl = lcm["inflation_layer"]["inflation_radius"]
+ assert g_infl > robot_r, "Global inflation_radius must exceed robot_radius"
+ assert l_infl > robot_r, "Local inflation_radius must exceed robot_radius"
+
+
+def test_lifecycle_manager_localization_nodes():
+ lm = _load_params()["lifecycle_manager_localization"]["ros__parameters"]
+ assert "map_server" in lm["node_names"]
+ assert "amcl" in lm["node_names"]
+
+
+def test_lifecycle_manager_navigation_nodes():
+ lm = _load_params()["lifecycle_manager_navigation"]["ros__parameters"]
+ for node in ("controller_server", "planner_server", "behavior_server", "bt_navigator"):
+ assert node in lm["node_names"], f"lifecycle nav missing: {node}"
+
+
+def test_velocity_smoother_limits_consistent():
+ vs = _load_params()["velocity_smoother"]["ros__parameters"]
+ ctrl = _load_params()["controller_server"]["ros__parameters"]
+ max_vx_ctrl = ctrl["FollowPath"]["max_vel_x"]
+ max_vx_vs = vs["max_velocity"][0]
+ # Smoother limit should be >= planner limit (or equal)
+ assert max_vx_vs >= max_vx_ctrl - 1e-3, (
+ f"velocity_smoother max_velocity[0]={max_vx_vs} < "
+ f"controller max_vel_x={max_vx_ctrl}"
+ )
+
+
+# ── saltybot_map.yaml ─────────────────────────────────────────────────────────
+
+def _load_map_yaml():
+ with open(_MAP_YAML) as f:
+ return yaml.safe_load(f)
+
+
+def test_map_yaml_exists():
+ assert os.path.isfile(_MAP_YAML)
+
+
+def test_map_yaml_required_keys():
+ m = _load_map_yaml()
+ for key in ("image", "resolution", "origin", "negate",
+ "occupied_thresh", "free_thresh"):
+ assert key in m, f"Map YAML missing key: {key}"
+
+
+def test_map_yaml_thresholds():
+ m = _load_map_yaml()
+ assert 0.0 < m["free_thresh"] < m["occupied_thresh"] < 1.0
+
+
+def test_map_yaml_resolution():
+ m = _load_map_yaml()
+ assert m["resolution"] == pytest.approx(0.05, abs=1e-6)
+
+
+def test_map_yaml_origin_3d():
+ m = _load_map_yaml()
+ assert len(m["origin"]) == 3 # [x, y, yaw]
+
+
+def test_map_yaml_image_name():
+ m = _load_map_yaml()
+ assert m["image"].endswith(".pgm")
+
+
+# ── saltybot_map.pgm ─────────────────────────────────────────────────────────
+
+def test_pgm_exists():
+ assert os.path.isfile(_MAP_PGM)
+
+
+def test_pgm_valid_header():
+ """P5 binary PGM: header 'P5\\nW H\\nMAXVAL\\n'."""
+ with open(_MAP_PGM, "rb") as f:
+ magic = f.readline().strip()
+ assert magic == b"P5", f"Expected P5 PGM, got {magic}"
+
+
+def test_pgm_dimensions():
+ """Parse width and height from PGM header; verify > 0."""
+ with open(_MAP_PGM, "rb") as f:
+ f.readline() # P5
+ wh_line = f.readline()
+ w_str, h_str = wh_line.decode().split()
+ w, h = int(w_str), int(h_str)
+ assert w > 0 and h > 0
+ assert w == 200 and h == 200
+
+
+def test_pgm_pixel_count():
+ """File size should match header dimensions + header bytes."""
+ with open(_MAP_PGM, "rb") as f:
+ lines = []
+ for _ in range(3):
+ lines.append(f.readline())
+ payload = f.read()
+ w, h = map(int, lines[1].decode().split())
+ assert len(payload) == w * h, (
+ f"Expected {w*h} pixels, got {len(payload)}"
+ )
+
+
+def test_pgm_all_free_space():
+ """All pixels should be 254 (near-white = free)."""
+ with open(_MAP_PGM, "rb") as f:
+ for _ in range(3):
+ f.readline()
+ data = f.read()
+ assert all(b == 254 for b in data), "Not all pixels are free (254)"
+
+
+# ── Launch file syntax check ──────────────────────────────────────────────────
+
+def test_launch_file_exists():
+ assert os.path.isfile(_LAUNCH)
+
+
+def test_launch_file_imports_cleanly():
+ """Compile launch file to check for Python syntax errors."""
+ import py_compile
+ py_compile.compile(_LAUNCH, doraise=True)
+
+
+def test_launch_file_has_generate_function():
+ """Launch file must define generate_launch_description()."""
+ with open(_LAUNCH) as f:
+ src = f.read()
+ assert "def generate_launch_description" in src
+
+
+def test_launch_file_references_amcl_params():
+ """Launch file must reference amcl_nav2_params.yaml."""
+ with open(_LAUNCH) as f:
+ src = f.read()
+ assert "amcl_nav2_params.yaml" in src
+
+
+def test_launch_file_references_odometry_bridge():
+ """Launch file must wire in VESC odometry bridge."""
+ with open(_LAUNCH) as f:
+ src = f.read()
+ assert "odometry_bridge.launch.py" in src
+
+
+def test_launch_file_references_localization():
+ """Launch file must include Nav2 localization_launch.py."""
+ with open(_LAUNCH) as f:
+ src = f.read()
+ assert "localization_launch.py" in src
+
+
+def test_launch_file_references_navigation():
+ """Launch file must include Nav2 navigation_launch.py."""
+ with open(_LAUNCH) as f:
+ src = f.read()
+ assert "navigation_launch.py" in src
+
+
+def test_launch_file_has_map_argument():
+ """Launch file must expose 'map' argument for map file path."""
+ with open(_LAUNCH) as f:
+ src = f.read()
+ assert '"map"' in src or "'map'" in src
+
+
+if __name__ == "__main__":
+ pytest.main([__file__, "-v"])