Thread: WiFi Basics in C programm (socket)

  1. #1
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    Oct 2022

    WiFi Basics in C programm (socket)


    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!

  2. #2
    and the hat of int overfl Salem's Avatar
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    Start here -> Useful Links And Good Books

    Network programming is the same API whether you're using wired or wireless.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

  3. #3
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  4. #4
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    Aug 2023
    #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");
        // 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");
        // Listen for incoming connections
        if (listen(server_socket, 5) == -1) {
            perror("Listening failed");
        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");
        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
        return 0;

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