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velxio/.devcontainer/README.md

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DevContainer for Velxio

This devcontainer provides a ready-to-use development environment for Velxio with:

  • Python 3.12 + FastAPI backend setup
  • Node.js 20 + React/Vite frontend setup
  • arduino-cli with AVR and RP2040 cores
  • Built wokwi-libs (avr8js, rp2040js, wokwi-elements)
  • Persistent volumes for node_modules and arduino cache

What's Included

Automatically Installed

  • Arduino AVR — Arduino Uno, Nano, Mega emulation
  • RP2040 — Raspberry Pi Pico / Pico W emulation
  • Frontend tooling — TypeScript, ESLint, Tailwind CSS
  • Backend tooling — Python virtual environment with all dependencies

Not Included (Manual Setup)

  • ESP32 Emulation (QEMU) — Requires platform-specific compilation

Why ESP32 QEMU is Manual

ESP32 emulation requires building QEMU from the lcgamboa fork, which:

  • Takes 15-30 minutes to compile
  • Requires platform-specific tools (MSYS2 on Windows, build-essential on Linux)
  • Generates 40-60 MB libraries excluded from git
  • Is optional — AVR and RP2040 work without it

For Docker users: ESP32 emulation is pre-built and included in the official image.

For development: If you need ESP32 emulation, see docs/ESP32_EMULATION.md

Getting Started

  1. Open this repository in VS Code with the Dev Containers extension
  2. VS Code will automatically build and start the devcontainer
  3. Wait for post-create.sh to complete (~5-6 minutes)
  4. Start the backend: cd backend && source venv/bin/activate && uvicorn app.main:app --reload --port 8001
  5. Start the frontend: cd frontend && npm run dev
  6. Open http://localhost:5173

Optimization Notes

  • Shallow clones — wokwi-libs use --depth=1 for faster setup (not recursive submodules)
  • Parallel builds — Backend, frontend, and wokwi-libs build concurrently
  • Volume mounts — node_modules and arduino cache persist between rebuilds
  • User-local tools — arduino-cli installs to ~/.local/bin (no sudo required)

Ports Forwarded

  • 5173 — Frontend (Vite dev server)
  • 8001 — Backend (FastAPI)

Troubleshooting

Builds are slow

First-time setup takes 5-6 minutes. Subsequent container starts use post-start.sh which only syncs dependencies (~30 seconds).

Permission errors on volumes

The post-create.sh script fixes ownership automatically. If you still see errors, rebuild the container.

Arduino cores missing

Check that arduino-cli is in PATH:

arduino-cli version
arduino-cli core list  # should show arduino:avr and rp2040:rp2040

Related Documentation