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

#define PORT 8888
#define MAX_BUFFER_SIZE 1024

int main() {
    int sockfd;
    struct sockaddr_in serverAddr, clientAddr;
    socklen_t addrLen = sizeof(clientAddr);
    char buffer[MAX_BUFFER_SIZE];

    // Creating socket file descriptor
    if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
        perror("Socket creation error");
        exit(EXIT_FAILURE);
    }

    memset(&serverAddr, 0, sizeof(serverAddr));
    memset(&clientAddr, 0, sizeof(clientAddr));

    serverAddr.sin_family = AF_INET;
    serverAddr.sin_addr.s_addr = INADDR_ANY;
    serverAddr.sin_port = htons(PORT);

    // Bind the socket to the specified port
    if (bind(sockfd, (const struct sockaddr *)&serverAddr, sizeof(serverAddr)) == -1) {
        perror("Bind error");
        exit(EXIT_FAILURE);
    }

    printf("UDP server running on port %d\n", PORT);

    // Receive data from clients indefinitely
    while (1) {
        int bytesReceived = recvfrom(sockfd, (char *)buffer, MAX_BUFFER_SIZE, 0, (struct sockaddr *)&clientAddr, &addrLen);
        buffer[bytesReceived] = '\0'; // Null-terminate the received data
        printf("Received message from client: %s\n", buffer);
    }

    return 0;
}

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

#define PORT 8888
#define SERVER_IP "127.0.0.1"

int main() {
    int sockfd;
    struct sockaddr_in serverAddr;
    char *message = "Hello, UDP Server!";

    // Creating socket file descriptor
    if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
        perror("Socket creation error");
        exit(EXIT_FAILURE);
    }

    memset(&serverAddr, 0, sizeof(serverAddr));

    serverAddr.sin_family = AF_INET;
    serverAddr.sin_port = htons(PORT);
    serverAddr.sin_addr.s_addr = inet_addr(SERVER_IP);

    // Send a message to the server
    if (sendto(sockfd, (const char *)message, strlen(message), 0, (const struct sockaddr *)&serverAddr, sizeof(serverAddr)) == -1) {
        perror("Sendto error");
        exit(EXIT_FAILURE);
    }

    printf("Message sent to server: %s\n", message);

    close(sockfd);

    return 0;
}