According to the ibeacon protocol "measuredPower" is supposed to be sent by every ibeacon in its advertising packet as the last value after uuid, major & minor values. However, the iOS corelocation service does not have any method which returns this "measuredPower". Also, if we reconfigure an ibeacon and change its txPower then the beacon should ideally advertise a different "measuredPower". Do all beacons do this? And how do we fetch the measuredPower of a beacon in iOS/corelocation.
You're right: beacons advertise UUID, Major, Minor and measured powerd, which is a value used by receiving devices to calculate proximity. However, access to measured power is part of Core Bluetooth framework, not Core Location.
You can read more about it in our documentation: http://estimote.github.io/iOS-SDK/Classes/ESTBeacon.html#//api/name/measuredPower