// Initially based on https://stackoverflow.com/a/35570418

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

int main(void)
{
    int const fd = socket(AF_INET, SOCK_DGRAM, 0);
    if (fd < 0) {
        perror("socket failed");
        return 1;
    }
    struct sockaddr_in const serveraddr = {
        .sin_family = AF_INET,
        .sin_port = htons(50037),
        .sin_addr.s_addr = htonl(INADDR_ANY),
    };
    if (bind(fd, (struct sockaddr *)&serveraddr, sizeof(serveraddr)) < 0) {
        perror("bind failed");
        return 1;
    }
    for (;;) {
        char buffer[200];
        int const length = recvfrom(fd, buffer, sizeof(buffer) - 1, 0, NULL, 0);
        if (length < 0) {
            perror("recvfrom failed");
            break;
        }
        buffer[length] = '\0';
        printf("%d bytes: '%s'\n", length, buffer);
    }
    close(fd);
}