I did not want to add a new comment. This was just a question to Gualiter Made by the way.
egalindo
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Thanks, BigBalli.
We have been using the table of known devices with a GPS approach, but we have had issues because of no updating this table in a timely manner.
I will explore option #1.
Sadly, option #3 doesn't fit with our use case since this requires the device has a sim card.