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152. Design a Minimal MQTT Bridge for Sensor Topics

Difficulty: 🟡 Medium
Category: Integration
Tags:
Execution Type: basic_python

💡 Why This Problem Matters

Fleet management dashboards (web apps) don't speak DDS. They speak MQTT/HTTP. Bridges connect the operational technology (OT) to information technology (IT).

Problem Statement

Problem Statement

Bridge ROS2 (local robot network) to MQTT (IoT/Cloud). Send sensor data to the cloud.

Requirements

  • Node mqtt_bridge
  • Subscribe: /battery_level (Float32)
  • Connect to MQTT Broker (e.g., localhost:1883)
  • On callback: Publish value to MQTT topic robot/battery

Input/Output Format

Input:

  • ROS topic updates.

Output:

  • MQTT messages.

⚠️ Common Pitfalls

  • Blocking the ROS callback waiting for network I/O.

📚 Helpful Resources

Test Cases

  • PublishesToMQTT: message on mqtt_topic
  • SubscribesFromMQTT: ros topic receives message

Contributing

Found an issue with this problem's description, or have a better hint?
Open a PR or report it in Discussions.

Note: TestScripts and reference solutions are maintained by the SimuCode team
and are not part of this open spec. This ensures grading integrity on simucode.online.