locationUpdateInterval for iOS about react-native-background-geolocation HOT 13 CLOSED

Native location apis are not time-based -- they're distance-based. You're always bound by distanceFilter

Android's locationUpdateInterval merely controls how often a location is picked out of the location stream and sends to your app. It's still bound by distanceFilter.

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I know, I am more concerned about the interval that the data is sent to the server.

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Ah, I see. I think what you want is this allowDeferredUpdatesUntilTimeTravelled

I'm due to implement this. This is the final part of the CLLocationManager api which I have not yet implmented (few people requested it. I had someone on the Cordova side request this recently, so I'll go ahead and start implementing it soon)

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That sounds great! If I understand correctly that will limit the requests to a specified interval. but I would also be interested in always sending the current location every 5s (even if the location didnt change). like a heartbeat to the server.
would that be possible with this api? or would i need a background task for that?

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What is the nature of your app that you require a location at 1/5 Hz regardless of location-change?

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It is a realtime tracking app with fairly high precision. The frequency doesn't have to be 1/5 Hz, but I want to be able to tell if the tracking is still active or disconnected / app crashed.

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And when the user is sitting in a movie theatre for 2 hours, for example, what are your expectations?

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In our app the user will explicitly start/stop live tracking (except when they lose network connectivity, app crashes, battery dies etc.)

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Regarding iOS specifically, this module has 4 possible states:

1. Stationary:. App is suspended. No code is running. No tracking.
2. Moving: App is awake and actively recording a location each distanceFilter meters.
3. Stop-detection:. Geolocation radios are off to conserve power. Module is aggressively monitoring the accelerometer for movement. This state can be engaged by a car stopped at a red light. If movement is detected (and the device has moved distanceFilter meters beyond last-location, State 2 is engaged. If stopTimeout expires, the module switches to State 1 or State 4 (if preventSuspend: true). During State 4, the module is cleverly preventing iOS from suspending the app by requesting 3 min background job from iOS. When a background job is nearly expired, the module briefly turns on location-updates, requests another 3 min background-job, then turns off location-updates again.
4. Heartbeat: This is a specialized state enabled with preventSuspend: true, heartbeatInterval: {Integer seconds}. This state hi-jacks iOS's natural desire to suspend an app when location-services are powered down, keeping the CPU spinning indefinitely by requesting background-jobs as described in State 3. During this state, the accelerometer is sampled at 1Hz. If any movement as all is detected after a heartbeatInterval, the location-radios will engage at full power and a very high-quality location is requested. If the device is determined to be moving (ie: speed is reported or the device has moved beyond the stationaryRadius, State #2 is engaged. Otherwise, the module will simply return the current stationary-location.

• State #4 is very new. It was paid for and implemented for a single customer with specific requirements.
• State 4 will have a serious impact on battery-life, since your app is prevented from sleeping and the accelerometer will be constantly firing up location services when movement is detected.

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I understand. Thanks for taking the time to explain!

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@christocracy, can you tell me please, on ios update by time is absent ?
I want to set up update by distance and by time at one time, if its possible.

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iOS location API is strictly distance-based (ie: distanceFilter)

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Thank you!

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