How to implement a Beacon scanner?

First of all, do you know what is beacon?

Just like iBeacon is a Bluetooth 4.0 communication protocol designed by Apple, Eddystone is an open Bluetooth 4.0 protocol from Google technology standard, which allows Mobile Apps (running on both iOS and Android devices) to listen for signals from beacons in the physical world and react accordingly. In essence, Eddystone technology allows Mobile Apps to understand their position on a micro-local scale, and deliver hyper-contextual content to users based on location.

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