A bluetooth application

I have a device that I am manufacturing that emits a BLE signal and can be embedded in a number of different form factors. The application I would like a quote for would run on an iOS or Android smart phone use the device's bluetooth reader to scan for available bluetooth devices within signal distance and compares the MAC addresses collected in the vicinity to a list of "known" devices. API's provided by another party will provide the application with a list of "known" devices as well as responses when an address is matched. A simple example of the function is to imagine our BLE device is embedded in a suitcase and emitting a BLE signal with a particular MAC address. A user has this application on an iPhone and has an updated list of known MAC addresses via the API. Now the application performs a scan and gets a match or matches. We now know that the embedded device is within 50 meters of the phone running our application. Further development would include using signal strength to determine if you are moving toward or away from the signal. This can be a prototype application and can begin with a simple UI and a scan at an interval determined by the user from 1 to 60 minutes. The scan could always begin with refreshing the "known" MAC addresses by obtaining that data from an API call and then subsequently making a scan and trying to make one or more matches.