It's an example, of using a UDP socket to receive server messages on port 1907. Example server command: "netcat -l -u -p 1907 localhost"

main.c

#include <error.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <netinet/in.h>
#include <sys/socket.h>

int UdpReceiveSocketDemo(void)
{
    int fd = socket(AF_INET, SOCK_DGRAM, 0);
    if (fd < 0) {
        perror("Create socket error");
        exit(1);
    }

    struct sockaddr_in addr = {0};
    addr.sin_family = AF_INET;
    addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
    addr.sin_port = htons(1907);

    char buffer[256] = "Hello Server\n";

    sendto(fd, buffer, sizeof(buffer), 0, (struct sockaddr *)&addr, sizeof(addr));

    while (true) {
        memset(buffer, 0, sizeof(buffer));
        if (recv(fd, buffer, sizeof(buffer), 0) == -1) {
            perror("Receive error");
            return 3;
        }
        printf("Receive data: %s", buffer);
    }
    close(fd);

    return 0;
}

int main(void)
{
  return UdpReceiveSocketDemo();
}