System time update

Currently, the tracker requests the current date/time via the LoRaWAN or the LTE network at the startup time (once successfully joined).

Note that the system clock will drift over time (due to the accuracy of the 32 kHz clock, about 10 ppm) and therefore the system time should be updated from time to time.

The system time is also actualized each time a successful GPS fix is done.

This technique works correctly only if the MT3333 is present in the module and the GPS fix technology is selected as always-done.