// gcc client.c -o client
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <netinet/tcp.h>

int main() {
    int sockfd;
    struct sockaddr_in servaddr;

    sockfd = socket(AF_INET, SOCK_STREAM, 0);

    int opt = 1;
    setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &opt, sizeof(opt));
    int idle = 10, intvl = 5, cnt = 4;
    setsockopt(sockfd, IPPROTO_TCP, TCP_KEEPIDLE, &idle, sizeof(idle));
    setsockopt(sockfd, IPPROTO_TCP, TCP_KEEPINTVL, &intvl, sizeof(intvl));
    setsockopt(sockfd, IPPROTO_TCP, TCP_KEEPCNT, &cnt, sizeof(cnt));

    servaddr.sin_family = AF_INET;
    servaddr.sin_port = htons(9090);
    inet_pton(AF_INET, "192.168.2.1", &servaddr.sin_addr);

    connect(sockfd, (struct sockaddr*)&servaddr, sizeof(servaddr));
    printf("Connected to server\n");

    char *msg = "Hello Server";
    send(sockfd, msg, strlen(msg), 0);

    pause(); // stay alive for keepalive probes
    return 0;
}