Why can't my ble scanner app on my phone detect my esp32

[peter_war]

Hi guys, this is my first time working on a ESP32. I am trying to make my ESP32 as beacon. After I uploaded the following code onto my ESP32 board, I tried to use my BLE Scanner app in my phone to see if it can detect my ESP32 board, but it wasn't able to detect. It can detect all other BLE devices in my room except for the ESP32.

Any help would be much appreciated.

#include "sys/time.h"
#include "BLEDevice.h"
#include "BLEUtils.h"
#include "BLEServer.h"
#include "BLEBeacon.h"
#include "esp_sleep.h"

#define GPIO_DEEP_SLEEP_DURATION     1  // sleep x seconds and then wake up
RTC_DATA_ATTR static time_t last;        // remember last boot in RTC Memory
RTC_DATA_ATTR static uint32_t bootcount; // remember number of boots in RTC Memory


// See the following for generating UUIDs:
// https://www.uuidgenerator.net/
BLEAdvertising *pAdvertising;   // BLE Advertisement type
struct timeval now;

#define BEACON_UUID "87b99b2c-90fd-11e9-bc42-526af7764f64" // UUID 1 128-Bit (may use linux tool uuidgen or random numbers via https://www.uuidgenerator.net/)

void setBeacon()
{

  BLEBeacon oBeacon = BLEBeacon();
  oBeacon.setManufacturerId(0x4C00); // fake Apple 0x004C LSB (ENDIAN_CHANGE_U16!)
  oBeacon.setProximityUUID(BLEUUID(BEACON_UUID));
  oBeacon.setMajor((bootcount & 0xFFFF0000) >> 16);
  oBeacon.setMinor(bootcount & 0xFFFF);
  BLEAdvertisementData oAdvertisementData = BLEAdvertisementData();
  BLEAdvertisementData oScanResponseData = BLEAdvertisementData();

  oAdvertisementData.setFlags(0x04); // BR_EDR_NOT_SUPPORTED 0x04

  std::string strServiceData = "";

  strServiceData += (char)26;     // Len
  strServiceData += (char)0xFF;   // Type
  strServiceData += oBeacon.getData();
  oAdvertisementData.addData(strServiceData);

  pAdvertising->setAdvertisementData(oAdvertisementData);
  pAdvertising->setScanResponseData(oScanResponseData);
}

void setup() {

  Serial.begin(115200);

  gettimeofday(&now, NULL);
  Serial.printf("start ESP32 %d\n", bootcount++);
  Serial.printf("deep sleep (%lds since last reset, %lds since last boot)\n", now.tv_sec, now.tv_sec - last);
  last = now.tv_sec;

}

void loop() {


 
    Serial.println("Continuous mode");
    // Create the BLE Device
    BLEDevice::init("Peter"); // Name of your Beacon Device 
    // Create the BLE Server
    BLEServer *pServer = BLEDevice::createServer(); // <-- no longer required to instantiate BLEServer, less flash and ram usage
    pAdvertising = BLEDevice::getAdvertising();
    BLEDevice::startAdvertising();
    setBeacon();
    // Start advertising
    pAdvertising->start();
    Serial.println("Advertizing started...");
    delay(1000);
    pAdvertising->stop();
    Serial.printf("enter deep sleep\n");
    esp_deep_sleep(5000000LL * GPIO_DEEP_SLEEP_DURATION);
    Serial.printf("in deep sleep\n");
 
}