Blink(1) when there are outstanding RTDs

blink.js

var Blink1 = require('node-blink1');
var request = require('request').defaults({strictSSL: false});
var blink = new Blink1();
var _ = require('underscore');

blink.fadeToRGB(2000,255,255,0, function() {
    blink.fadeToRGB(200,0,0,0, function() {
    });
});

var baseUrl = 'https://e278-jsc:8082/api';
var username = 'System Admin'
var password = '1';

var _api = function(method, data, success, failure) {
    request.post(baseUrl + method, {body: JSON.stringify(data)}, function(error, response, body) {
        if (error || response.statusCode !== 200) {
            if (_.isFunction(failure)) {
                if (body) {
                    failure(error, JSON.parse(body));
                } else {
                    failure(error);
                }
            }
        } else {
            if (_.isFunction(success)) {
                success(JSON.parse(body));
            }
        }
    });
};

var errorFunc = function() {
    blink.fadeToRGB(200,255,0,0, function() {
        blink.fadeToRGB(100,0,0,0, function() {
        });
    });
};

var fade = 0;

setInterval(function() {
    _api('/Authentication/Login', {UserName: username, Password: password}, function(data) {
        var token = data.AuthenticationToken;
        _api('/Rtd/List/Assigned', {AuthenticationToken: token}, function(data) {
            if (data.TotalRecords > 0) {
                if (++fade > 1) {
                    fade = 0;
                }
                if (fade == 0) {
                    blink.fadeToRGB(500, 255, 255, 0);
                } else {
                    blink.fadeToRGB(500, 255, 220, 0);

                }
            } else {
                blink.fadeToRGB(500,0,0,0);
            }
            _api('/Authentication/Logout', {AuthenticationToken: token}, function() {}, errorFunc);
        }, errorFunc);
    }, errorFunc);
}, 1000);