rSMPP Client

A modern, high-performance, and secure SMPP v3.4 client built with Rust and Slint UI.

🚀 Key Features

🖥️ Modern User Interface

• Built with Slint: Lightweight, responsive, and native-looking UI.
• Dark Theme: Sleek, professional dark mode design.
• Layout Optimized: "Use every pixel" philosophy with compact, aligned controls.
• Responsive: Adapts perfectly to different window sizes (min-width derived).
• Interactive Logs: Transaction logs are selectable and copyable for easy debugging.

⚡ Performance & Stability

• Efficient Rendering: Utilizes a single read-only text widget for logs to prevent UI lockups.
• Memory Management: O(1) memory complexity log tracking with bounded string length.
• Backpressure Handling: Non-blocking channel pushes (try_send) prevent I/O deadlocks during heavy load.

🔒 Security & Connectivity

• TLS 1.2 / 1.3 Support: Secure connections using rustls.
• Flexible SSL: "Use SSL" toggle for secure vs plain TCP connections.
• Dev-Friendly: Includes a "Dangerous Verifier" mode to skip certificate validation (great for local testing/self-signed certs).
• Graceful Disconnect: Dedicated Unbind support for clean session termination.

📨 Advanced Messaging

• Powered by: smpp-codec (Comprehensive PDU library)
• Encoding Support:
  • GSM 7-bit: Standard SMS encoding (basic + extended charset).
  • Latin-1 (8-bit): For binary or Western European languages.
  • UCS-2 (16-bit): Full support for Emoji and international scripts.
• Long Message Handling:
  • UDH (User Data Header): Standard concatenation.
  • SAR (Segmentation and Reassembly): Optional TLV-based splitting.
  • Message Payload: Send up to 64kb as a single payload TLV.
• Ancillary Operations:
  • Query SM: Check the status of submitted messages.
  • Cancel SM: Cancel pending messages.
  • Replace SM: Update the content of pending messages.
  • SubmitMulti: Automatically detects multiple recipients and uses submit_multi PDU.
• Delivery Receipts (DLR): Request and view detailed Delivery Reports.

📊 Robust Logging

• Live Transaction Log: Real-time view of all sent and received PDUs.
• Detailed DeliverSM: Logs Sender, Recipient, Message Content, and specific DLR status/IDs.
• PDU Inspection: Hex dumps and detailed error reporting for debugging.

🛠️ Getting Started

Prerequisites

• Rust Toolchain (cargo) installed.

Run the Application

cargo run --release

Linux Users

Please refer to COMPILING_ON_LINUX.md for platform-specific dependencies and build instructions.

Configuration

1. Server Config: Enter Host IP and Port (default 2775).
2. Credentials: Enter System ID and Password.
3. Bind Mode: Choose Transceiver (Send/Recv), Information Receiver, or Transmitter.
4. SSL: Check "Use SSL" for secure connections.
5. Connect: Click to bind to the server.

🏗️ Tech Stack

• Language: Rust 🦀
• UI Framework: Slint
• Async Runtime: Tokio
• TLS: tokio-rustls / rustls
• Protocol: smpp-codec

📝 License

Apache 2.0

🤖 Disclaimer

This project was co-developed with Google Gemini, an advanced AI assistant, which generated the majority of the code, UI design, and documentation based on user requirements and prompts.