text: function getResponse(adr, callback, timeoutCallback, timeout){
  	if(timeoutCallback === undefined) { 
  		timeoutCallback = function(){
  			location.reload()
  		};
  	}
  	if(timeout === undefined) { 
  		timeout = 8000; 
  	}
  	var xmlhttp = new XMLHttpRequest();
  	xmlhttp.onreadystatechange = function() {
  		if(xmlhttp.readyState == 4){
  	    if(xmlhttp.status == 200) callback(xmlhttp.responseText);
  			else timeoutCallback();
  		}
  	};
  	xmlhttp.open("GET", adr, true);
  	xmlhttp.send();
  	xmlhttp.timeout = timeout;
    xmlhttp.ontimeout = timeoutCallback;
  }
  
  function restartESP() {
    getResponse("restartESP.json", function(responseText) {
      if (responseText == "true") getData();
      else alert("error");
    });
  }