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

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

#define SERVICE_UUID        "b58ac4ec-7c6d-4ca2-b678-2b709db8c65e"
#define CHARACTERISTIC_UUID "beb5483e-36e1-4688-b7f5-ea07361b26a8"

int LED=D9;

class MyCallbacks: public BLECharacteristicCallbacks { //Class for the callbacks (any exchange of information)
    void onWrite(BLECharacteristic *pCharacteristic) { //Method to enter when receiving information
      String value = pCharacteristic->getValue(); //getValue is a function to receive the information as strings
      String zero = "0"; //Create a string variable to compare (this was easier for me to visualize it)
      String one = "1"; //Second string variable
      if(value==zero){ //Comparison from the value received and a value I expect
        digitalWrite(LED,LOW); //Turn off the LED
      }
      else if(value==one){ //Comparison from the value received and another value I expect
       digitalWrite(LED,HIGH); //Turn on the LED
      }

      if (value.length() > 0) { //Comparator for when there is something received (this is written in the Xiao wiki and decided to conserve it)
        Serial.println("*********"); //Print a line of asterisks to separate things
        Serial.print("New value: "); //Print
        for (int i = 0; i < value.length(); i++) //Go over each character of the value received
          Serial.print(value[i]); //Print each character

        Serial.println(); //Give a line break
        Serial.println("*********"); //Print another line of asterisks
      }
    }
};

void setup() {
  Serial.begin(115200); //Begin serial communication to be able to print in the serial monitor
  pinMode(LED,OUTPUT); //Establish the pin mode of the LED port
  BLEDevice::init("DanisitaBBQ_2"); //Name server
  BLEServer *pServer = BLEDevice::createServer(); //Set BLE device as a server

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

  BLECharacteristic *pCharacteristic = pService->createCharacteristic( //Set the server characteristic 
                                         CHARACTERISTIC_UUID,
                                         BLECharacteristic::PROPERTY_READ | //Give the property to read
                                         BLECharacteristic::PROPERTY_WRITE //Give the property to write
                                       );

  pCharacteristic->setCallbacks(new MyCallbacks()); //Enter the function of MyCallbacks to exchange information

  pCharacteristic->setValue("Buenas tardes"); //Set a value to be read when it connects
  pService->start(); //Begin the service

  BLEAdvertising *pAdvertising = pServer->getAdvertising(); //Start service and advertising
  pAdvertising->start();
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(2000); //Delay to avoid a stack of information
}