How to set connection parameters on Central device on bluez?

Here is the code snippet which will send connection parameters update request:

static void UpdateConnParams(uint16_t handle ,uint16_t min, uint16_t max )
{
    int dev_id = -1;
    uint16_t  latency, timeout;
    int dd;
    printf("\n Connection Parameters update !!");

    latency = 0x0007;
    timeout = 0x0C80;

    if (dev_id < 0)
        dev_id = hci_get_route(NULL);

    dd = hci_open_dev(dev_id);
    if (dd < 0) {
        fprintf(stderr, "HCI device open failed\n");
        exit(1);
    }

    if (hci_le_conn_update(dd, htobs(handle), htobs(min), htobs(max),
                htobs(latency), htobs(timeout), 5000) < 0) {
        int err = -errno;
        fprintf(stderr, "Could not change connection params: %s(%d)\n",
                            strerror(-err), -err);
    }

    hci_close_dev(dd);
}