ionic 4 when app minimize it not work

i try it but it giving issue i started it on click but it not working in background? Like this

startBackgroundGeolocation() { const config: BackgroundGeolocationConfig = { desiredAccuracy: 10, stationaryRadius: 1, distanceFilter: 1, interval:15000, debug: true, // enable this hear sounds for background-geolocation life-cycle. stopOnTerminate: false // enable this to clear background location settings when the app terminates

};

this.backgroundGeolocation.configure(config).then(() => {
  this.backgroundGeolocation
    .on(BackgroundGeolocationEvents.location)
    .subscribe((location: BackgroundGeolocationResponse) => {
      // alert(location.longitude);
      this.sendGPS(location);

      // IMPORTANT:  You must execute the finish method here to inform the native plugin that you're finished,
      // and the background-task may be completed.  You must do this regardless if your operations are successful or not.
      // IF YOU DON'T, ios will CRASH YOUR APP for spending too much time in the background.
    });
});

// start recording location
this.backgroundGeolocation.start();

// If you wish to turn OFF background-tracking, call the #stop method.
// this.backgroundGeolocation.stop();

}

sendGPS(location) { if (location.speed == undefined) { location.speed = 0; } let timestamp = new Date(location.time);

this.http
  .post(
    this.gps_update_link, // backend api to post
    {
      lat: location.latitude,
      lng: location.longitude,
      speed: location.speed,
      timestamp: timestamp
    },
    {}
  )
  .then(data => {
    this.Data.push({lat : location.latitude , lon : location.longitude , spe : location.speed , time : location.timestamp});
    console.log(data.status);
    console.log(data.data); // data received by server
    console.log(data.headers);
    this.backgroundGeolocation.finish(); // FOR IOS ONLY
  })
  .catch(error => {
    alert(error.status);
    alert(error.error); // error message as string
    alert(error.headers);
    this.backgroundGeolocation.finish(); // FOR IOS ONLY
  });

}

This is a code i am using please inform me what i am doing wrong?

mauron85 / cordova-plugin-background-geolocation-example

ionic 4 when app minimize it not work #30