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Chapter 8: Launch Files and Parameter Management

Learning Objectives​

By the end of this section, you will be able to:

  • Write launch files to coordinate multiple nodes
  • Configure parameters and parameter servers
  • Use parameter substitutions and conditions
  • Manage node namespacing and remapping
  • Implement real-world launch file patterns
  • Debug launch file issues

Status: In Progress​

This section is being created by the technical writing sub-agent. Expected delivery: December 14, 2025.

Research Phase: Input from robotics_researcher - Task 1.4 Details

Coming Soon​

This section will cover:

  • Launch File Basics: Syntax and structure
  • Python Launch API: Modern ROS 2 launch approach
  • Running Multiple Nodes: Coordination patterns
  • Parameter Servers: Dynamic configuration
  • Substitutions: Variables and expressions in launch files
  • Conditions: Conditional node launching
  • Node Composition: Composable nodes and containers
  • Namespacing: Organizing complex systems
  • Real-World Patterns: Humanoid robot launch configurations

Code Examples Included:

  • Simple launch file for two nodes
  • Complex launch file with parameters
  • Parameter files (YAML)
  • Node composition examples
  • Humanoid robot launch patterns

Placeholder: Content Structure​

## Introduction
Coordinating complex robotic systems

## Launch File Basics
The Python Launch API

## Running Multiple Nodes
Launching coordinated systems

## Parameter Management
Configuration and dynamic reconfiguration

## Substitutions and Conditions
Advanced launch scripting

## Node Composition
Running multiple nodes in one process

## Namespacing and Remapping
Organizing complex graphs

## Real-World Patterns
Practical configurations from humanoid robots

## Debugging Launch Files
Common issues and solutions

## Key Takeaways
Summary and reflection

Previous: 2.3 Building ROS 2 Packages
Next: Chapter 3: Robot Simulation with Gazebo