connect_to_fd_opts
return connect_to_fd_opts(server_fd, &opts);
int connect_to_fd_opts(int server_fd, const struct network_helper_opts *opts);
*cli_fd = connect_to_fd_opts(*srv_fd, cli_opts);
fd = connect_to_fd_opts(server_fd, NULL);
client_fd = connect_to_fd_opts(server_fd, &opts);
client_fd1 = connect_to_fd_opts(listen_fd, NULL);
client_fd2 = connect_to_fd_opts(listen_fd, NULL);
client = connect_to_fd_opts(server, &opts);