ESP32 Forum

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/*
    Based on Neil Kolban example for IDF: https://github.com/nkolban/esp32-snippets/blob/master/cpp_utils/tests/BLE%20Tests/SampleServer.cpp
    Ported to Arduino ESP32 by Evandro Copercini
*/

#include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEServer.h>

// See the following for generating UUIDs:
// https://www.uuidgenerator.net/

#define SERVICE_UUID        "4fafc201-1fb5-459e-8fcc-c5c9c331914b"
#define CHARACTERISTIC_UUID "beb5483e-36e1-4688-b7f5-ea07361b26a8"

#define LOOP_DELAY 100


float blePairTimeOut = 0;

class MySecurity : public BLESecurityCallbacks {
  
  bool onConfirmPIN(uint32_t pin){
    Serial.println("onConfirmPIN");
    if (blePairTimeOut > 0){
      return true;  
    }
    else{
      return false;
    }
  }
  
  uint32_t onPassKeyRequest(){
    Serial.println("onPassKeyRequest");
        ESP_LOGI(LOG_TAG, "PassKeyRequest");
    return 133700;
  }

  void onPassKeyNotify(uint32_t pass_key){
    Serial.println("onPassKeyNotify");
        ESP_LOGI(LOG_TAG, "On passkey Notify number:%d", pass_key);
  }

  bool onSecurityRequest(){
    Serial.println("onSecurityRequest");
      ESP_LOGI(LOG_TAG, "On Security Request");
    return true;
  }

  void onAuthenticationComplete(esp_ble_auth_cmpl_t cmpl){
    Serial.println("onAuthenticationComplete");
    ESP_LOGI(LOG_TAG, "Starting BLE work!");
    if(cmpl.success){
      Serial.println("onAuthenticationComplete -> success");
      uint16_t length;
      esp_ble_gap_get_whitelist_size(&length);
      ESP_LOGD(LOG_TAG, "size: %d", length);
    }
    else{
      Serial.println("onAuthenticationComplete -> fail");
    }
  }
};

void setup() {
    

    
  Serial.begin(115200);
  Serial.println("Starting BLE work!");

  BLEDevice::init("ESP32 TW");
  BLEDevice::setEncryptionLevel(ESP_BLE_SEC_ENCRYPT);
  /*
   * Required in authentication process to provide displaying and/or input passkey or yes/no butttons confirmation
   */
  BLEDevice::setSecurityCallbacks(new MySecurity());
  BLEServer *pServer = BLEDevice::createServer();
  
  //public services
  BLEService *pService = pServer->createService(SERVICE_UUID);
  BLECharacteristic *pCharacteristic = pService->createCharacteristic(
                                         CHARACTERISTIC_UUID,
                                         BLECharacteristic::PROPERTY_READ |
                                         BLECharacteristic::PROPERTY_WRITE
                                       );

  pCharacteristic->setValue("Hello World says Neil");
  pCharacteristic->setCallbacks("
  pService->start();
  BLEAdvertising *pAdvertising = pServer->getAdvertising();
  pAdvertising->start();



  
  BLESecurity *pSecurity = new BLESecurity();
  pSecurity->setAuthenticationMode(ESP_LE_AUTH_REQ_SC_MITM_BOND); //ESP_LE_AUTH_REQ_SC_ONLY
  pSecurity->setCapability(ESP_IO_CAP_KBDISP);
  pSecurity->setInitEncryptionKey(ESP_BLE_ENC_KEY_MASK | ESP_BLE_ID_KEY_MASK);
  Serial.println("Characteristic defined! Now you can read it in your phone!");
}

void loop() {
  // put your main code here, to run repeatedly:
    int val = hallRead();
  // print the results to the serial monitor:
  //Serial.print("sensor = ");
  
  if (val > 100 ) {
    // turn LED on:
    Serial.println("BLE ACTIVE");
    blePairTimeOut = 10;
    
  } else {
    // turn LED off:
  }
  
  delay(LOOP_DELAY);
  if (blePairTimeOut > 0){
    blePairTimeOut = blePairTimeOut - LOOP_DELAY/1000;
  }
}

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 bool onSecurityRequest() {
    Serial.println("onSecurityRequest");
    return true;
}

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server->getAdvertising()->setScanFilter(false,true);

BLESecurity *pSecurity = new BLESecurity();
pSecurity->setAuthenticationMode(ESP_LE_AUTH_REQ_SC_BOND);
pSecurity->setCapability(ESP_IO_CAP_NONE);
pSecurity->setInitEncryptionKey(ESP_BLE_ENC_KEY_MASK | ESP_BLE_ID_KEY_MASK);

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server->getAdvertising()->setScanFilter(false,false);

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BLEDevice::setCustomGapHandler(my_gap_event_handler);
static void my_gap_event_handler(esp_gap_ble_cb_event_t  event, esp_ble_gap_cb_param_t* param) {
switch(event){
    case ESP_GAP_BLE_AUTH_CMPL_EVT:{
      BLEAddress address = BLEAddress(param->ble_security.auth_cmpl.bd_addr);
      BLEDevice::whiteListAdd(address);
      break;
   }   
}