function logintorouter(){
        $.ajax({
            type: 'GET',
            dataType:"text",
            url: 'login.php'
        }).done(function(data){
            if(data.includes('WiFi')){
                setWiFichannel(); /*Wait for this function to finish before closing cURL connection */
            }else{
                 alert('something went wrong, try again later!');
            }
        }).fail(function(data){
            alert('can not connect to router');
        });
    }

<?php
function openRouter(){
$username = 'admin';
$password = 'pass';

$url="http://10.1.10.1/login/Auth";
$postinfo = "username=".$username."&password=".$password;

$cookie_file_path = "cookie.txt";

$ch = curl_init();
curl_setopt($ch, CURLOPT_HEADER, false);
curl_setopt($ch, CURLOPT_NOBODY, false);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);

curl_setopt($ch, CURLOPT_COOKIEJAR, $cookie_file_path);
curl_setopt($ch, CURLOPT_COOKIE, "cookiename=0");
curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:56.0) Gecko/20100101 Firefox/56.0");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_REFERER, $_SERVER['REQUEST_URI']);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 0);

curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $postinfo);
curl_exec($ch);

curl_setopt($ch, CURLOPT_URL, "http://10.1.10.1/main.html#WiFi");
$mainPage = curl_exec($ch);

curl_close($ch);
/*As you can see I close the connection here so the setWiFichannel() will fail
but I don't want to keep the connection alive forever*/
return $mainPage;
}

echo openRouter();
?>