// Copyright (c) Sandeep Mistry. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.

// Import libraries (BLEPeripheral depends on SPI)
#include <SPI.h>
#include <BLEPeripheral.h>

// define pins (varies per shield/board)
#define BLE_REQ   10
#define BLE_RDY   2
#define BLE_RST   9

// LED pin
#define LED_PIN   3

// create peripheral instance, see pinouts above
BLEPeripheral            blePeripheral        = BLEPeripheral(BLE_REQ, BLE_RDY, BLE_RST);

// create service
BLEService               ledService           = BLEService("19b10000e8f2537e4f6cd104768a1214");

// create switch characteristic
BLECharCharacteristic    switchCharacteristic = BLECharCharacteristic("19b10001e8f2537e4f6cd104768a1214", BLERead | BLEWrite);

void setup() {
  Serial.begin(9600);
#if defined (__AVR_ATmega32U4__)
  delay(5000);  //5 seconds delay for enabling to see the start up comments on the serial board
#endif

  // set LED pin to output mode
  pinMode(LED_PIN, OUTPUT);

  // set advertised local name and service UUID
  blePeripheral.setLocalName("LED");
  blePeripheral.setAdvertisedServiceUuid(ledService.uuid());

  // add service and characteristic
  blePeripheral.addAttribute(ledService);
  blePeripheral.addAttribute(switchCharacteristic);

  // begin initialization
  blePeripheral.begin();

  Serial.println(F("BLE LED Peripheral"));
}

void loop() {
  BLECentral central = blePeripheral.central();

  if (central) {
    // central connected to peripheral
    Serial.print(F("Connected to central: "));
    Serial.println(central.address());

    while (central.connected()) {
      // central still connected to peripheral
      if (switchCharacteristic.written()) {
        // central wrote new value to characteristic, update LED
        if (switchCharacteristic.value()) {
          Serial.println(F("LED on"));
          digitalWrite(LED_PIN, HIGH);
        } else {
          Serial.println(F("LED off"));
          digitalWrite(LED_PIN, LOW);
        }
      }
    }

    // central disconnected
    Serial.print(F("Disconnected from central: "));
    Serial.println(central.address());
  }
}