#include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEScan.h>
#include <BLEAdvertisedDevice.h>//BLE lib include
//declare a BLE scan object
class MyAdvertisedDeviceCallbacks: public BLEAdvertisedDeviceCallbacks
{void onResult(BLEAdvertisedDevice advertisedDevice)
  {//Serial.printf("Advertised Device: %s \n", advertisedDevice.toString().c_str());
    }
};
int scanTime=5;//set scantime, if time too less, you will lost some beacons that not discovered
void setup()
{
  Serial.begin(9600);
}

void loop()
{
  Serial.println("Beacon Scanning....");
  BLEDevice::init("");//clear beacon list
  BLEScan* pBLEScan = BLEDevice::getScan(); //create scan
  pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks());
  pBLEScan->setActiveScan(true); //start to scan
  BLEScanResults foundDevices = pBLEScan->start(scanTime);//wait for scanning
  Serial.print("Found Beacons: ");
  Serial.println(foundDevices.getCount());
  Serial.println("End of Scanning");
  int BeaconCount=foundDevices.getCount();
  //list discover beacons data
  Serial.println("Show Beacons content:");
   for (int i=0; i<BeaconCount; i++)
   {
       BLEAdvertisedDevice d=foundDevices.getDevice(i);
       Serial.print("Address=");
       String BeaconAddress=d.getAddress().toString().c_str();
       Serial.print(BeaconAddress);
       int BeaconRSSI=d.getRSSI();
       if (d.haveServiceUUID())//show UUID
       {
         Serial.print(",UUID=");
         String BeaconUUID;
         BeaconUUID=d.getServiceUUID().toString().c_str();
         Serial.print(BeaconUUID);
       }

       if (d.haveName())//Show name
       {
        Serial.printf(",name=");
        String BeaconName=d.getName().c_str();
        Serial.print(BeaconName);
       }
       Serial.print(",RSSI=");
       Serial.println(BeaconRSSI);//Show RSSI

       //-----add some codes here. ex
       //if beacon's address equal to the address you want, and RSSI bigger than -50, then make some noise
       //-----
   }

}