Use ESP32 BLE with Smart Phone as proximity Sensor

I would like to use ESP32 bluetooth which can be connected to the phone device. When the phone comes near the esp it will be connected and the BLE RSSI of phone will be checked by esp if its met the threshold then it will turn on the builtin LED of ESP. Also need to store the phone UUID in ESP32 memory and check if the phone connected to esp, has uuid exists in the memory.