Thread: WiFi Basics in C programm (socket)

Hello,

I'm curious about the data transmission aspects of WiFi programming in C. Could someone please share a basic code snippet or example that illustrates how to send data from one device to another using WiFi in a C program? I'm a beginner in WiFi programming, and this example would be immensely helpful in understanding the fundamentals.

Thank you!

Another good resource is Douglas Comer books

Douglas Comer - Wikipedia

https://www.cs.purdue.edu/homes/comer/comerbooks.html

Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/socket.h>


#define PORT 8080
#define MAX_BUFFER_SIZE 1024


int main() {
    int server_socket, client_socket;
    struct sockaddr_in server_addr, client_addr;
    socklen_t client_addr_len = sizeof(client_addr);


    char buffer[MAX_BUFFER_SIZE] = "Hello, WiFi World!"; // Data to send


    // Create a socket
    server_socket = socket(AF_INET, SOCK_STREAM, 0);
    if (server_socket == -1) {
        perror("Socket creation failed");
        exit(EXIT_FAILURE);
    }


    // Initialize server address structure
    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = INADDR_ANY;
    server_addr.sin_port = htons(PORT);


    // Bind the socket to the server address
    if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)) == -1) {
        perror("Binding failed");
        exit(EXIT_FAILURE);
    }


    // Listen for incoming connections
    if (listen(server_socket, 5) == -1) {
        perror("Listening failed");
        exit(EXIT_FAILURE);
    }


    printf("Server listening on port %d...\n", PORT);


    // Accept a client connection
    client_socket = accept(server_socket, (struct sockaddr*)&client_addr, &client_addr_len);
    if (client_socket == -1) {
        perror("Accepting client connection failed");
        exit(EXIT_FAILURE);
    }


    printf("Client connected\n");


    // Send data to the client
    send(client_socket, buffer, strlen(buffer), 0);
    printf("Data sent to the client: %s\n", buffer);


    // Close the sockets
    close(client_socket);
    close(server_socket);


    return 0;
}