Ryan
fb30e8e884
Move lesson source into the teaching structure, align the course path with the learner's Go and DevOps experience, and add the interactive lesson guides. Add advanced DevOps lifecycle study as a separate section. Bound MQTT message work and drain accepted jobs during shutdown; align the backend implementation with the revised course through Section 6.
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Mission: Go backend for MQTT vending devices
Why
Build and maintain a Go backend that communicates with Mosquitto over MQTT 5, receives vending-device telemetry and logs, exposes status, and sends safe commands and updates.
Success looks like
- Trace a device operation from HTTP request through MQTT delivery to device result without confusing their acknowledgements.
- Implement and maintain bounded, validated, observable Go handlers for device messages and commands.
- Diagnose failures across the API, backend, broker, and device boundaries.
Constraints
- Use this repository's simulator and disposable lab; keep the production backend read-only.
- Assume Go and Docker basics and prior MQTT 3.1.1 study; focus on MQTT 5 behavior and operational consequences.
- Lessons should be brief, use an overview before details, include meaningful emojis, and require the learner to retrieve or apply an idea.
Out of scope
- Sending real commands to vending machines or changing production systems.
- Treating broker delivery as proof that a device performed a business action.