function callURL(url)
{
	var xmlhttp = new XMLHttpRequest();
	xmlhttp.open("GET", url, true);
	xmlhttp.send();
}

function getjson(url, handler_func)
{
	var xmlhttp = new XMLHttpRequest();
	xmlhttp.onreadystatechange = function () {
		if(this.readyState == 4 && this.status == 200) {
			var data = JSON.parse(this.responseText);
			handler_func(data);
		}
	}

	xmlhttp.open("GET", url, true);
	xmlhttp.send();
}

function getBME680Data(handler_func)
{
	return getjson("/bme680.json", handler_func);
}