AWS Location geofence tracker

Question

I want to create or update a Tracker in AWS Location. If the tracker name does not exist, I want to ***create*** the tracker, otherwise I want to ***update*** the tracker. What is the best practice to achieve this? I was thinking about getting all the trackers and then determining if the tracker name in question exists. Is there a better way to do this? Here is some pseudocode of what I was thinking about to achieve this:

```
const trackerName = 'my-tracker-' + event.truckName;

// List all the trackers...
const location.listTrackers(params = {}, function(err, data) {
   // Logic inside the callback to determine if trackerName exists...
   if () {
      location.createTracker(); // create the tracker
   } else {
      location.updateTracker(); // update the tracker with vehicle position
   }  
});
```

Answer

Yes. You can track thousands of devices with a single tracker. BatchUpdateDevicePosition also allows you to associate 1-3 attributes with positions that you send to tracking service, and you will get them from EventBridge with the Enter/Exit events. (see PositionProperties)

In your case, you could have just one tracker and send truck specific information like the truck name with each position and use it in the lambda that will be your target for EventBridge.

Thanks,
Oren

AWS-User-7918543

answered 2 years ago

In your case, you could have just one tracker and send truck specific information like the truck name with each position and use it in the lambda that will be your target for EventBridge.

Thanks,  
Oren

Answer

Yes, this is how you could check if a tracker exists. Alternatively you could call another operation on the tracker and see if you got a ResourceNotFoundException.

However, I am curious about what you are trying to achieve, because your code sample, mentions ```location.updateTracker(); // update the tracker with vehicle position```. [UpdateTracker](https://docs.aws.amazon.com/location-trackers/latest/APIReference/API_UpdateTracker.html
) is an API to update the properties of a given tracker like its description and not for updating device positions.

Can you explain a little bit more about what you are trying to do, I may be able to help... (for example, why are you creating a tracker per truck?)

AWS Location geofence tracker

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