sta/README.md

STA - Smart Temperature & Appliance Control

🤖 AI-Assisted Development Notice: This project uses Claude Code as a development assistant for task planning, code organization, and workflow management. However, all code is human-written, reviewed, and validated by the project maintainer. AI is used as a productivity tool, not as the author of the implementation.

Web-based Modbus relay control system for managing 8-channel relay modules over TCP.

⚠️ Development Status: This project is in early development. Core features are currently being implemented following a specification-driven approach.

Overview

STA will provide a modern web interface for controlling Modbus-compatible relay devices, eliminating the need for specialized industrial software. The goal is to enable browser-based relay control with real-time status updates.

Current Status

Phase 1 Complete - Foundation:

• ✅ Monorepo structure (backend + frontend at root)
• ✅ Rust web server with Poem 3.1 framework
• ✅ Configuration system (YAML + environment variables)
• ✅ Modbus TCP and relay settings structures
• ✅ Health check and metadata API endpoints
• ✅ OpenAPI documentation with Swagger UI
• ✅ Rate limiting middleware
• ✅ SQLite schema and repository for relay labels
• ✅ Vue 3 + TypeScript frontend scaffolding with Vite
• ✅ Type-safe API client generation from OpenAPI specs

Phase 2 In Progress - Domain Layer:

• 🚧 Domain types with Type-Driven Development (RelayId, RelayState, RelayLabel)
• 🚧 100% test coverage for domain layer

Planned - Phases 3-8:

• 📋 Modbus TCP client with tokio-modbus (Phase 3)
• 📋 Mock controller for testing (Phase 3)
• 📋 Health monitoring service (Phase 3)
• 📋 US1: Monitor & toggle relay states - MVP (Phase 4)
• 📋 US2: Bulk relay controls (Phase 5)
• 📋 US3: Health status display (Phase 6)
• 📋 US4: Relay labeling (Phase 7)
• 📋 Production deployment (Phase 8)

See tasks.md for detailed implementation roadmap (94 tasks across 8 phases).

Architecture

Current:

• Backend: Rust 2024 with Poem web framework
• Configuration: YAML-based with environment variable overrides
• API: RESTful HTTP with OpenAPI documentation

Planned:

• Modbus Integration: tokio-modbus for Modbus TCP communication
• Frontend: Vue 3 with TypeScript
• Deployment: Backend on Raspberry Pi, frontend on Cloudflare Pages
• Access: Traefik reverse proxy with Authelia authentication
• Persistence: SQLite for relay labels and configuration

Quick Start

Prerequisites

• Rust 1.83+ (edition 2024)
• Just command runner

Development

# Run development server
just run

# Run tests
just test

# Run linter
just lint

# Format code
just format

# Watch mode with bacon
bacon          # clippy-all (default)
bacon test     # test watcher

Configuration

Edit settings/base.yaml for Modbus device settings:

modbus:
  host: "192.168.0.200"
  port: 502
  slave_id: 0
  timeout_secs: 5

relay:
  label_max_length: 50

Override with environment variables:

APP__MODBUS__HOST=192.168.1.100 cargo run

API Documentation

The server provides OpenAPI documentation via Swagger UI:

• Swagger UI: http://localhost:8080/
• OpenAPI Spec: http://localhost:8080/openapi.json

Current Endpoints:

• GET /api/health - Health check endpoint
• GET /api/meta - Application metadata

Planned Endpoints (see spec):

• GET /api/relays - List all relay states
• POST /api/relays/{id}/toggle - Toggle relay state
• POST /api/relays/all/on - Turn all relays on
• POST /api/relays/all/off - Turn all relays off
• PUT /api/relays/{id}/label - Set relay label

Project Structure

Monorepo Layout:

sta/                          # Repository root
├── backend/                  # Rust backend workspace member
│   ├── src/
│   │   ├── lib.rs           - Library entry point
│   │   ├── main.rs          - Binary entry point
│   │   ├── startup.rs       - Application builder and server config
│   │   ├── settings.rs      - Configuration management
│   │   ├── telemetry.rs     - Logging and tracing setup
│   │   ├── domain/          - Business logic (Phase 2 in progress)
│   │   │   └── relay/       - Relay domain types and repository traits
│   │   ├── application/     - Use cases (planned Phase 3-4)
│   │   ├── infrastructure/  - External integrations (Phase 3)
│   │   │   └── persistence/ - SQLite repository implementation
│   │   ├── presentation/    - API layer (planned Phase 4)
│   │   ├── route/           - HTTP endpoint handlers
│   │   │   ├── health.rs    - Health check endpoints
│   │   │   └── meta.rs      - Application metadata
│   │   └── middleware/      - Custom middleware
│   │       └── rate_limit.rs
│   ├── settings/            - YAML configuration files
│   └── tests/               - Integration tests
├── src/                     # Frontend source (Vue/TypeScript)
│   └── api/                 - Type-safe API client
├── specs/                   # Feature specifications and documentation
│   ├── constitution.md      - Architectural principles
│   └── 001-modbus-relay-control/
│       ├── spec.md          - Feature specification
│       ├── plan.md          - Implementation plan
│       ├── tasks.md         - Task breakdown (94 tasks)
│       └── research-cors.md - CORS configuration research
├── package.json             - Frontend dependencies
├── vite.config.ts          - Vite build configuration
└── justfile                 - Build commands

Technology Stack

Currently Used:

• Rust 2024 edition
• Poem 3.1 (web framework with OpenAPI support)
• Tokio 1.48 (async runtime)
• config (YAML configuration)
• tracing + tracing-subscriber (structured logging)
• governor (rate limiting)
• thiserror (error handling)

Planned Dependencies:

• tokio-modbus 0.17 (Modbus TCP client)
• SQLx 0.8 (async SQLite database access)
• mockall 0.13 (mocking for tests)

Frontend (planned):

• Vue 3 + TypeScript
• Vite build tool
• Axios (HTTP client)

Documentation

• Project Constitution - Architectural principles and development guidelines
• Modbus Relay Control Spec - Feature specification
• CLAUDE.md - Developer guide and code style rules

License

This project is under the AGPL-3.0 license. You can find it in the LICENSE.md file.