Check if iDevice with a specific app is nearby
Is it possible to check within an app, if there are other idevices nearby
which have the app running?
For example device A starts the app. Device B also starts the app. When
they are nearby, a notification will popup.
I know its possible to check the range between two GPS coordinates. But
the only solution that I've found on the internet was, that I have to make
a webservice/server which handles the coordinates which were sent by the
idevices.
But I'd like to make it run "offline", without saving/sending the data at
a webserver.
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