Application for saving sensor data not working in background

Application for saving sensor data not working in background

BY 03 Jun 2019 Web Application Development

Hi,

for a medical study my goal is to obtain several sensor data (HRM, RR Intervall, Light, Pressure, Movement) and save them with the current time to a .txt file.

So far everything was working till I implemented the part to save the data. I could use the method for one sensor and then the app began to lag, if I try to save more than one sensor value, the app stops working completly. To save, I use the following code:

 

    function getHRM() {
    var hrm = 0.0;
    var rrintervall;
 
    function onGetSuccessCB(hrmInfo) {
   
        hrm = hrmInfo.heartRate;
        console.log(hrm);
        document.getElementById(‘hrm’).innerHTML = (‘hrm: ‘ + hrm + “<br />”);
        rrintervall = hrmInfo.rRInterval;
        console.log(rrintervall);
        document.getElementById(‘rr-value’).innerHTML = (‘rr: ‘ + rrintervall + “<br />”);
        tizen.filesystem.resolve(“documents”, function(dir) 
        {
           file = dir.resolve(“hrm.txt”);
           file.openStream(
            “a”, 
        function(fs) {
            fs.write(” ” + hrm + ” “+ tizen.time.getCurrentDateTime().toLocaleString()+”;”);
                    fs.close();
                }, function(e) {
                    console.log(“Error ” + e.message);
                }, “UTF-8”);
        });
        
    }
    
    tizen.humanactivitymonitor.start(‘HRM’, onGetSuccessCB);
    }
Also I realized, that the app is not saving any data when the screen is turned off. Before saving the data, it was that, when the screen was turned off and I switched it on again, it felt like, the app was “rushing” through the values from the time when the screen was turned off. After I implemented the saving function I just didn’t record any background data. 
 
Any ideas, what causes the problems? I read somewhere that it is not possible to record the data in the background without programming it in C but I could’t verify it so far, is that true? 
 
I’m glad for every help, thanks.
Written by
Keep Reading All Posts
Announcing the Tizen Studio 6.1 Release

BY

16 Apr 2025

Tizen Studio

Read More
Announcing the Tizen Studio 6.0 Release

BY

04 Nov 2024

Tizen Studio

Read More
Announcing the Tizen Studio 5.6 Release

BY

02 Apr 2024

Tizen Studio

Read More