sdtn (SpaceArth DTN)

sdtn (SpaceArth DTN) is a Rust-based implementation of Delay Tolerant Networking (DTN), designed for resilient communication between space and earth — and beyond.

This project aims to offer modular, efficient, and extensible components for BPv7-based DTN systems, suitable for both space and terrestrial disruption-tolerant networks.

"From space to earth. For the disconnected."

Documentation

• Usage Guide - Library usage and API documentation
• 使用方法 - ライブラリの使用方法とAPIドキュメント（日本語）

Contact

For questions, suggestions, or contributions, please contact:

• Email: hsatlefp@gmail.com

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Features

• 🌍 BPv7-compliant Bundle Protocol
• 🛰️ Store-and-forward mechanism
• 🔌 Modular CLA (Convergence Layer Adapter) design
• 📦 Bundle persistence and metadata management
• 🛠️ Extensible for LoRa, BLE, disaster scenarios, and more

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Quick Start

CLI Tool

A command-line tool for creating and managing Bundle Protocol bundles is available:

# Install the project
cargo install sdtn

# Create a bundle
sdtn insert --message "Hello, DTN!"

# List all bundles
sdtn list

# Show bundle details (using partial ID)
sdtn show --id <partial_id>

# Start daemon listener (receiver)
sdtn daemon listener --addr 127.0.0.1:3000

# Start daemon dialer (sender)
sdtn daemon dialer --addr 127.0.0.1:3000

Configuration is managed in config/default.toml and can be overridden with environment variables:

# Specify config file
export DTN_CONFIG="config/development.toml"

# Override individual settings
export DTN_BUNDLE_VERSION=8
export DTN_ENDPOINTS_DESTINATION="dtn://new-dest"

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Testing the Setup

You can verify basic DTN communication with the following steps:

1. Start the listener (receiver)

# Run in terminal 1
sdtn daemon listener --addr 127.0.0.1:3000

2. Create a bundle and send it via dialer (sender)

# Run in terminal 2
sdtn insert --message "Hello, DTN!"
sdtn daemon dialer --addr 127.0.0.1:3000

This procedure allows you to verify that the created bundle is transmitted via TCP and received by the listener.

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Development Roadmap

Current development phase and future plans:

1. ✅ Bundle Structure & CBOR Support

   • Bundle structure definition
   • CBOR serialization/deserialization
   • Basic CLI operations

2. ✅ Bundle Storage/Load

   • File-based persistence
   • BundleStore implementation
   • Partial ID lookup support
   • Automatic test cleanup
   • Bundle dispatch functionality

3. ✅ TCP CLA Communication

   • TCP CLA (Listener / Dialer) bundle transmission and reception
   • ACK response (text format)

4. 🚧 CLA Abstraction and Transmission Integration

   • Common interface definition via trait Cla
   • Transmission and reception verification via CLA abstraction
   • Integration with BundleStore

5. 🔜 Routing Function Implementation (Highest Priority)

   • CLA selection based on destination
   • Static routing table (destination → next hop)
   • Structure consideration for future dynamic routing compatibility

6. ⏸ CLA Diversification (Low Priority)

   • BLE CLA: Both Central and Peripheral written in Rust (※Operation verification planned after Raspberry Pi purchase)
   • LoRa CLA phased implementation (USB AT → SPI → embedded / RTOS)
   • Dynamic CLA selection integration conforming to trait Cla

7. 🚧 Software Bus and Task Management

   • Inter-process communication
   • Message queue
   • Async processing and task scheduling

8. ⬛ Management CLI / WebUI (Optional)

   • Advanced management features
   • Visualization tools

9. ⬛ RFC Compliance (Optional)

   • RFC 9171 compliance tests
   • Interoperability tests

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License

MIT OR Apache-2.0

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AI-Generated Content

Some parts of this project (README, code comments, and sample logic) are co-authored or generated using AI tools. All code is manually reviewed and tested before use.