UDP Message Transmitter and Receiver

This repository contains a pair of C programs, sender.c and receiver.c, designed to transmit and receive messages over a network using the UDP protocol. These programs can be used for network communication experiments, testing UDP packet transmission, or implementing a simple messaging protocol between systems.

Project Overview

• sender.c: Sends a predefined message ("GOOSE message") to a specified IP address and port at regular intervals.
• receiver.c: Listens for incoming UDP packets on a specified port, then displays the message content and additional metadata upon receiving each message.

Code Overview

• sender.c:

• Creates a UDP socket and connects to the receiver at the specified IP and port.

• Sends a predefined message ("GOOSE message") every 3 seconds in an infinite loop.

• If the message fails to send, the program outputs an error message.

• receiver.c:

• Binds a UDP socket to port 102, listening for any incoming messages.

• Upon receiving a message, it displays:

  • The content of the message
  • The length of the message
  • Error details if a message cannot be received.

Configuration

• Sender: Update the IP address in sender.c to the receiver's IP address before compiling.
  • server.sin_addr.s_addr = inet_addr("RECEIVER_IP_ADDRESS");
• Port: Both programs use port 102 by default, which is commonly associated with GOOSE messaging in industrial systems. Modify the port if needed in both sender.c and receiver.c.

Features

• Simple UDP Communication: Provides a basic implementation of UDP sockets for network communication.
• Constant Transmission: The sender program repeatedly sends messages every 3 seconds.
• Real-Time Message Reception: The receiver program listens continuously for incoming messages and displays them in the console.

Requirements

• Operating System: Both programs are designed for Linux environments.
• Libraries: Standard C libraries (stdio.h, stdlib.h, string.h, arpa/inet.h, sys/socket.h, unistd.h, and errno.h).

Acknowledgements

• This project was developed to demonstrate a basic UDP-based message transmission and reception protocol in C.

Compile both programs using gcc:

gcc sender.c -o sender
gcc receiver.c -o receiver