LwM2M - Show the newest location of a device in the Map widget

Hi,

as defined by the LwM2M standard, while creating a new LwM2M observer the actual value will be returned. In addition, Cumulocity automatically creates a location event with a timestamp and position fragment without a timestamp while observing LwM2M object /6/0.

In our solution we are combining two sources of location information. On one hand, GPS locations are received from the device via the object /6/0. On the other hand, cell locations are created via a microservice.

The issue occurs, when after receiving a cell location, the device does a new registration. Depending on the device implementation, the following scenario could happen:

- GPS location 1 via the object /6/0 with timestamp 1

- CELL location 1 via the microservice with timestamp 2

- Device reset (New registration & Observer registration)

- GPS location 1 via the object /6/0 with timestamp 1 is retransferred again and shown for instance in the Map widget.

The following solutions could be considered to solve this issue:

- Option 1: Use the location with the latest timestamp in the Map widget. In this case, the c8y_position fragment could be extended with a timestamp.

- Option 2: GPS location via the object /6/0 with timestamp 0 could be ignored by Cumulocity. (Special solution for Location object)

- Option 3: A flag on observer level to ignore the returned value during observer creation. (General solution for LwM2M observers)

Thank you!

Best regards,

Attila