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Reliable Image Transfer Protocol

A lightweight, UDP-based file transfer protocol with a sliding window mechanism to ensure reliable delivery of images over a network with simulated packet loss.

Features

  • Reliable Transmission: Implements a sliding window protocol with selective repeat to ensure reliable and ordered delivery of image packets.
  • Packet Loss Simulation: Simulates packet loss with a configurable percentage.
  • Multiple Image Transfer: Supports sequential transfer of multiple files from the sender to the receiver.
  • Acknowledgment-Based: Uses acknowledgment packets to confirm receipt of individual data packets.

Files and Structure

  • packet.py: Contains the definitions for data and acknowledgment packets, and functions to create data packets.
  • sender.py: The sender side of the protocol that reads images from disk, breaks them into packets, and sends them to the receiver.
  • receive.py: The receiver side of the protocol that listens for packets, acknowledges them, and reconstructs the image files.

File Structure

.
├── images
│   ├── large.jpeg
│   ├── medium.jpeg
│   └── small.jpeg
├── packet.py
├── sender.py
└── receive.py

Usage

1. Clone the Repository

git clone https://github.com/yourusername/reliable-image-transfer.git
cd reliable-image-transfer

2. Prepare Images

Place your images in the images directory and ensure they are named according to the imgs list in sender.py.

3. Run the Receiver

Start the receiver to listen for incoming packets.

python receive.py

4. Run the Sender

Start the sender to send images sequentially to the receiver.

python sender.py

Configuration

  • Packet Loss Simulation: The sender simulates a 15% packet loss by default. You can adjust this by changing the probability condition in the send function of sender.py.
if random.randint(1, 100) >= 15:  # Adjust this value for different loss rates
    sender.sendto(packets[i].packet, (receiver_ip, receiver_port))
  • Sliding Window Size: The window size is adjustable in sender.py through the window_size parameter.
window_size = 4  # Adjust the size as needed

License

This project is licensed under the MIT License. See the LICENSE file for details.