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#include <BLEDevice.h>
#include <BLEServer.h>
#include <BLEUtils.h>
#include <BLE2902.h>
#include <driver/adc.h>


bool deviceConnected = false;
bool deviceDisconnected = true;

#define SERVICE_UUID        "4fafc201-1fb5-459e-8fcc-c5c9c331914b" //define service UUID 
#define CHARACTERISTIC_UUID_TX "59f51a40-8852-4abe-a50f-2d45e6bd51ac" //define characteristics UUID for sending
#define CHARACTERISTIC_UUID_TX1 "59f51a41-8852-4abe-a50f-2d45e6bd51ac"

//Create a class to know wether you are connected or not
class MyServerCallbacks: public BLEServerCallbacks {
  void onConnect(BLEServer* pServer) { 
    Serial.println("Connected");
    deviceConnected = true;
    deviceDisconnected= false;
  };
  void onDisconnect(BLEServer* pServer){
    Serial.println("Disconnected");
    deviceConnected = false;
    deviceDisconnected= true;
    pServer->getAdvertising()->start();
  };
};

BLECharacteristic *pCharacteristic;
BLECharacteristic *pCharacteristic1;

void setup() {
  // put your setup code here, to run once:
Serial.begin(115200);
// Create the BLE device
BLEDevice::init("Arduino-ESP32S3");

//Create the BLE server
BLEServer *pServer= BLEDevice::createServer();
pServer->setCallbacks(new MyServerCallbacks());

//Create the BLE service
BLEService *pService = pServer->createService(SERVICE_UUID);


pCharacteristic=pService->createCharacteristic(CHARACTERISTIC_UUID_TX,
                     BLECharacteristic::PROPERTY_NOTIFY);
pCharacteristic1=pService->createCharacteristic(CHARACTERISTIC_UUID_TX1,
                     BLECharacteristic::PROPERTY_NOTIFY);                     

pCharacteristic->addDescriptor(new BLE2902());
pCharacteristic1->addDescriptor(new BLE2902());


pService->start();

pServer->getAdvertising()->start();
Serial.println("Waiting for client connection to notify...");
}
void loop() {;

  while (deviceConnected){
    //Keep measuring and sending data while being connected to a phone each ... seconds(to be determined)
    float VoltageN;
    float VoltageN1;
    int raw_dataN;
    raw_dataN=adc1_get_raw(ADC1_CHANNEL_3);
    VoltageN=raw_dataN*3.30/4095.00; 
    VoltageN1=raw_dataN;
   char txString[8];
   dtostrf(VoltageN, 1, 2,txString);
   pCharacteristic->setValue(VoltageN);
   pCharacteristic1->setValue(VoltageN1);
   pCharacteristic->notify();
   pCharacteristic1->notify();
   
   
   Serial.println("Voltage" + String(txString));
   delay(500);
}
  if (deviceDisconnected){
delay(500);
  }}