The system is based on iBeacon Bluetooth transmitters installed in each bus stop and bus. iBeacon is used to detect if the user is at the stop or in the bus. 

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User's device connects to iBeacon via Bluetooth using an Android app. User doesn't have to do anything related to iBeacons, the app does it. 

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We have a Python Flask server providing REST API in heroku. Users' and bus drivers' client apps communicate with it.