var Is_Connected = "";



 function request_image(url) 
 {
        return new Promise(function(resolve, reject) {
            var img = new Image();
            img.onload = function() { resolve(img); };
            img.onerror = function() { reject(url); };
            img.src = url + '?random-no-cache=' + Math.floor((1 + Math.random()) * 0x10000).toString(16);
        });
 };



 function ping(url, multiplier) 
 {
       
        return new Promise(function(resolve, reject) 
        {
            var start = (new Date()).getTime();
            var response = function() { 
                var delta = ((new Date()).getTime() - start);
                delta *= (multiplier || 1);
                resolve(delta); 
            };
            request_image(url).then(response).catch(response);
            
            setTimeout(function() { reject(Error('Timeout')); }, 2000);
        });
 }
    

var do_ping = function() {
        ping("http://192.168.1.49:10005/").then(function(delta) {
            
            if (delta<2000 && Is_Connected == "Try") 
               {
                Is_Connected = "Yes";                                                 
               }  
               
            if (delta<2000 && Is_Connected == "Lost") 
               {
                //window.open("http://192.168.1.49:10005/","_self");
                window.location.href =("http://192.168.1.49:10005/"); 
                Is_Connected = "Try";                                                 
               }            

            
            
        }).catch(function(error) {
             Is_Connected = "Lost"; 
        });
};




function Create_Timer() 
{
 Is_Connected = "Try";
 window.setInterval(do_ping, 3000);
}

 
document.addEventListener("DOMContentLoaded", Create_Timer);