ios - Core Bluetooth act as Beacon -
a device ibeacon technology,can used establish region around object. allows ios device determine when has entered or left region.(example - whenever come across beacon device, estimated distance(range)of device , gives notification devices ). possible use core bluetooth same functionality?
you implement own ibeacon-like functionality in app, not duplicate os level support. lot of work, it's possible.
however...
with ibeacons location manager takes care of beacon notifications you, , notify app enter/exit beacon regions if app suspended or not running @ time. third party apps can't that. period.
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