ROS2 Topics - Complex Nested Messages

Medium Topics 72% pass rate
#topics#custom-message#publisher#subscriber

Practice the ROS2 Topics - Complex Nested Messages coding problem in Topics. Browser-based execution with automated grading — no local ROS install required. 72% of engineers pass this challenge.

Problem Statement

In real-world ROS 2 applications, you rarely publish raw integers or strings. You must construct and publish complex, nested message structures like geometry_msgs/msg/PoseStamped.

Requirements

  • Create a ROS 2 node named complex_message_node.
  • Subscribe to nothing.
  • Publish a geometry_msgs/msg/PoseStamped to the topic /target_pose at 2Hz (0.5s timer).
  • The message MUST be fully populated:
    • header.frame_id must be 'map'
    • pose.position.x must be 1.0, y must be 2.0
    • pose.orientation.w must be 1.0 (valid unit quaternion)

📚 Helpful Resources

Input/Output Format

Input: None | Output: /target_pose (geometry_msgs/PoseStamped)

⚠️ Common Pitfalls

  • Not initializing the header stamp
  • Wrong quaternion orientation

📚 Helpful Resources

Frequently asked questions

What is the ROS2 Topics - Complex Nested Messages practice problem?

It is a hands-on Topics challenge on SimuCode where you implement and run ROS2 code in the browser with runtime-verified tests.

How do I practice ROS2 Topics - Complex Nested Messages online?

Open this page, sign in, and solve the problem in the built-in IDE. Your solution is graded against real ROS2 execution checks.

What skills does ROS2 Topics - Complex Nested Messages test?

This Medium problem focuses on topics, custom-message, publisher skills used in robotics interviews and production systems.