ButtonLED.ino

/*
 * Copyright (c) 2016 Intel Corporation.  All rights reserved.
 * See the bottom of this file for the license terms.
 */

#include <CurieBLE.h>

const int ledPin = 13; // set ledPin to on-board LED
const int buttonPin = 4; // set buttonPin to digital pin 4

BLEService ledService("19B10010-E8F2-537E-4F6C-D104768A1214"); // create service


// create switch characteristic and allow remote device to read and write
BLECharCharacteristic ledCharacteristic("19B10011-E8F2-537E-4F6C-D104768A1214", BLERead | BLEWrite);
// create button characteristic and allow remote device to get notifications
BLECharCharacteristic buttonCharacteristic("19B10012-E8F2-537E-4F6C-D104768A1214", BLERead | BLENotify); // allows remote device to get notifications

void setup() {
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT); // use the LED on pin 13 as an output
  pinMode(buttonPin, INPUT); // use button pin 4 as an input

  // begin initialization
  BLE.begin();

  // set the local name peripheral advertises
  BLE.setLocalName("BtnLED");
  // set the UUID for the service this peripheral advertises:
  BLE.setAdvertisedService(ledService);

  // add the characteristics to the service
  ledService.addCharacteristic(ledCharacteristic);
  ledService.addCharacteristic(buttonCharacteristic);

  // add the service
  BLE.addService(ledService);

  ledCharacteristic.setValue(0);
  buttonCharacteristic.setValue(0);

  // start advertising
  BLE.advertise();

  Serial.println("Bluetooth device active, waiting for connections...");
}

void loop() {
  // poll for BLE events
  BLE.poll();

  // read the current button pin state
  char buttonValue = digitalRead(buttonPin);

  // has the value changed since the last read
  bool buttonChanged = (buttonCharacteristic.value() != buttonValue);

  if (buttonChanged) {
    // button state changed, update characteristics
    ledCharacteristic.setValue(buttonValue);
    buttonCharacteristic.setValue(buttonValue);
  }

  if (ledCharacteristic.written() || buttonChanged) {
    // update LED, either central has written to characteristic or button state has changed
    if (ledCharacteristic.value()) {
      Serial.println("LED on");
      digitalWrite(ledPin, HIGH);
    } else {
      Serial.println("LED off");
      digitalWrite(ledPin, LOW);
    }
  }
}

/*
  Copyright (c) 2016 Intel Corporation. All rights reserved.

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-
  1301 USA
*/