App doesn't broadcast when wakeLocks added - firefox-os

Question

I have a geoLocation app for a Firefox OS device (ZTE Open v1.1), that broadcasts to a web server its location details.
However, my code doesn't run if I minimise the app and turn the screen off.
I thought adding the following requestWakeLocks to the code would sort the problem, but it doesn't seem to help:
var lock = window.navigator.requestWakeLock('gps');
var lock = window.navigator.requestWakeLock('wifi');
Do you have any idea what I am doing wrong?
Code:
function init() {
document.addEventListener("DOMContentLoaded", watchPosition, false); // to test on web browser
//document.addEventListener("deviceready", watchPosition, false); // deviceready is a cordova event
}
/* ---------------------------------- Local Variables ---------------------------------- */
var checkPeriodically;
var watchPositionOutput = document.getElementById('watchPositionOutput');
var ajaxVars; // HTTP POST data values
/* ---------------------------------- Local Functions ---------------------------------- */
function watchPosition() {
var lock = window.navigator.requestWakeLock('gps'); // FireFox-OS only - keeps the gps active when screen is off
var lock = window.navigator.requestWakeLock('wifi');
checkPeriodically = setInterval(checkTime, 10000);
var watchID = navigator.geolocation.watchPosition(onSuccess, onError, options);
var options = {
enableHighAccuracy: true,
}
function onSuccess(position) {
ajaxVars =
"lt=" + position.coords.latitude +
"&lg=" + position.coords.longitude +
"&ac=" + position.coords.accuracy +
"&sp=" + position.coords.speed +
"&ts=" + position.timestamp +
"&sec=SEC_TOKEN";
var dt = new Date(position.timestamp);
date_time =
dt.getFullYear() + '-' +
(dt.getMonth() + 1) + '-' +
dt.getDate() + ' ' +
dt.getHours() + ':' +
dt.getMinutes() + ':' +
dt.getSeconds();
watchPositionOutput.innerHTML =
'Latitude: ' + position.coords.latitude + '<br>' +
'Longitude: ' + position.coords.longitude + '<br>' +
'Accuracy: ' + position.coords.accuracy + '<br>' +
'Speed: ' + position.coords.speed + '<br>' +
'Timestamp: ' + date_time + '<br>';
}
function onError(error) {
watchPositionOutput.innerHTML = 'code: ' + error.code + '<br>' +'message: ' + error.message + '<br>';
}
}
// update the server with location data
function ajax_post(postData){
// when there is no data in postData
if (typeof(postData) === 'undefined') { return false; } // exit the function
var req = new XMLHttpRequest(); // Create XMLHttpRequest object
var url = "http://example.com/locate-me/post.php";
//var url = "http://localhost/locate-me/post.php";
req.open("POST", url, true);
// Set content type header info for sending url encoded variables in the request
req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
// Access the onreadystatechange event for the XMLHttpRequest object
req.onreadystatechange = function() {
if(req.readyState == 4 && req.status == 200) {
var return_data = req.responseText; // return whatever php echos
var date_time = new Date(return_data * 1000); // php is currently returning the time (timestamp)
document.getElementById("status").innerHTML = "Server time: " + date_time;
}
}
// Send data to PHP, and wait for response to update the status div
req.send(postData); // execute the request
document.getElementById("status").innerHTML = "processing...";
}
// schedule to post the position data to a php script during certain times on certain days
function checkTime(){
// for example a day (day 0 == Sun) between 06:00 abd 23:45
var d = new Date();
var today = d.getDay();
var hms = d.getHours()+":"+d.getMinutes();
// mon - thurs
if( (today === 1 || today === 2 || today === 3 || today === 4) && hms > "10:23" && hms < "15:40") {
ajax_post(ajaxVars);
}
// friday
else if( today === 5 && hms > "13:00" && hms < "13:40") {
ajax_post(ajaxVars);
}
// testing: run all the time
else if( today < 7 ) {
ajax_post(ajaxVars);
}
else {
document.getElementById("status").innerHTML = "Data not scheduled to be posted to the server yet";
}
}
init();

Answer 1

Have you tried?
navigator.requestWakeLock('cpu');
If that still does not work, maybe you should follow the discussion in:
Firefox OS Background services