brewbutton.ino

/**
 * NESPRESSO BLE INTERFACE
 * In the shitty NESPRESSO coffee maker, it is not possible to program
 * the amount of water that goes through the capsule from the outside.
 * Therefore this setup was needed. Was thinking of throwing it out.
 * But realized I neede the BLE Client skills for a number of other devices at home
 *  * 
 * Based on BLE client example that is rich in capabilities.
 * There is a lot new capabilities implemented.
 * author unknown
 * updated by chegewara
 * 
 * https://gist.github.com/kolontsov/352f51859d15ee4e66368122bbf4d7c5
 * /~https://github.com/nkolban/ESP32_BLE_Arduino
 * 
 * Also added an I2C LCD for debugging/information purposes
 */


#define CONFIG_BLE_SMP_ENABLE 1
#include <string.h>
#include <LiquidCrystal_I2C.h>
#include "esp_log.h"
#include "BLEDevice.h"


// set the LCD number of columns and rows
int lcdColumns = 16;
int lcdRows = 2;

// set LCD address, number of columns and rows
// if you don't know your display address, run an I2C scanner sketch
LiquidCrystal_I2C lcd(0x27, lcdColumns, lcdRows);  


char cmd[128];    // UGLY hack, which re-uses a dedicated buffer
/*
This code is not used...
// Water temperature
#define TEMP_LOW 	"01"
#define TEMP_MEDIUM	"00"
#define TEMP_HIGH	"02"

// Type of coffee
#define RISTRETTO	"00"
#define ESPRESSO	"01"
#define LUNGO	    "02"
#define AMERICANO	"04"
#define HOTWATER	"05"
#define RECIPE		"07"


#define uint_16   unsigned int
unit_16 adjust_range(uint_16 x, uint_16 y, uint_16 z) 
{
  if (x<y)
    return y;
  if (x>z)
    return z;
  return x;
}

#define MAX_COFFEE_SIZE 140
#define MIN_COFFEE_SIZE 15
#define MAX_WATER_SIZE  300
#define MIN_WATER_SIZE  25
// size in ml.
char *brew_recipe(uint_16 coffee_size, uint_16 water_size, byte reversed )
{
  cmd[0]=0x00;
  coffee_size = adjust_range(coffee_size, MIN_COFFEE_SIZE, MAX_COFFEE_SIZE);
  water_size  = adjust_range(water_size, MIN_WATER_SIZE,MAX_WATER_SIZE);
  if ( reversed ) {
    strcat("02");

  }
  else {
    strcat( cmd, "01" );
    strcat( cmd, itoa(coffe_size));
    strcat( cmd, "02" );
    strcat( cmd, itoa(coffe_size));

  }
  return cmd;  
}
char *brew_cmd(char *vol, char *temp )
{
	strcpy(cmd, "0305070400000000");
	strcat(cmd, temp);
	strcat(cmd, vol);
	return cmd;
}
*/

/*********************** END BREW COMMAND STUFF ***********************/

// The remote service we wish to connect to.
// NESPRESSO DEVICE UUID

// Auth Characteristics


// The characteristic of the remote service we are interested in.
// CMD characteristics


static BLEUUID deviceServiceUUID( "06aa1910-f22a-11e3-9daa-0002a5d5c51b" );

static BLEUUID authServiceUUID( "06aa1910-f22a-11e3-9daa-0002a5d5c51b" );
static BLEUUID cmdStatusServiceUUID( "06aa1920-f22a-11e3-9daa-0002a5d5c51b" );

static BLEUUID authCharUUID( "06aa3a41-f22a-11e3-9daa-0002a5d5c51b" );
static BLEUUID cmdCharUUID( "06aa3a42-f22a-11e3-9daa-0002a5d5c51b" );
static BLEUUID statusCharUUID( "06aa3a12-f22a-11e3-9daa-0002a5d5c51b" );

// Characteristics
static BLERemoteCharacteristic* pRemoteCharacteristicAuth;
static BLERemoteCharacteristic* pRemoteCharacteristicCommand;
static BLERemoteCharacteristic* pRemoteCharacteristicStatus;



static String nespressoDeviceAuth = "879608e27cb1f96e"; // replace with your auth (from sniffer)

//static String nespressoDeviceId[] = "D0:09:E2:58:54:B8"; // replace with your device id

static boolean doConnect = false;
static boolean connected = false;
static boolean doScan = false;

static BLEAdvertisedDevice* myDevice;

static void notifyCallback(
  BLERemoteCharacteristic* pBLERemoteCharacteristic,
  uint8_t* pData,
  size_t length,
  bool isNotify) {
    Serial.print("Notify callback for characteristic ");
    Serial.print(pBLERemoteCharacteristic->getUUID().toString().c_str());
    Serial.print(" of data length ");
    Serial.println(length);
    Serial.print("data: ");
    Serial.println((char*)pData);
}

class MyClientCallback : public BLEClientCallbacks {
  void onConnect(BLEClient* pclient) {
  }

  void onDisconnect(BLEClient* pclient) {
    connected = false;
    Serial.println("onDisconnect");
    lcd.clear();
    lcd.print("Disconnected");
  }
};


bool connectToServer() {
    Serial.print("Forming a connection to ");
    Serial.println(myDevice->getAddress().toString().c_str());
    
    BLEClient*  pClient  = BLEDevice::createClient();
    Serial.println(" - Created client");


    BLEDevice::setEncryptionLevel(ESP_BLE_SEC_ENCRYPT);   //

    pClient->setClientCallbacks(new MyClientCallback());

    // Connect to the remove BLE Server.
    pClient->connect(myDevice);  // if you pass BLEAdvertisedDevice instead of address, it will be recognized type of peer device address (public or private)
    Serial.println(" - Connected to server");

    // Obtain a reference to the service we are after in the remote BLE server.
 
    BLERemoteService* pRemoteService = pClient->getService(authServiceUUID);
    if (pRemoteService == nullptr) {
      Serial.print("Failed to find our service UUID: ");
      Serial.println(authServiceUUID.toString().c_str());
      pClient->disconnect();
      return false;
    }
    
    Serial.println(" - Found our service");
    Serial.println(authServiceUUID.toString().c_str());

	  // FIRST NESPRESSO AUTH
    // Obtain a reference to the characteristic in the service of the remote BLE server.
    pRemoteCharacteristicAuth = pRemoteService->getCharacteristic(authCharUUID);

    if (pRemoteCharacteristicAuth == nullptr) {
      Serial.print("Failed to find our AUTH characteristic UUID: ");
      Serial.println(authCharUUID.toString().c_str());
      pClient->disconnect();
      return false;
    }
    Serial.println(authCharUUID.toString().c_str());
    Serial.println(" - Found AUTH characteristic");

    if (pRemoteCharacteristicAuth->canWrite()) {
        Serial.println("The AUTH characteristic can be written to");
    }


    pRemoteService = pClient->getService(cmdStatusServiceUUID);
    if (pRemoteService == nullptr) {
      Serial.print("Failed to find our service UUID: ");
      Serial.println(cmdStatusServiceUUID.toString().c_str());
      pClient->disconnect();
      return false;
    }
    
    Serial.println(cmdStatusServiceUUID.toString().c_str());
    Serial.println(" - Found our CMD service");

    // Obtain a reference to the characteristic in the service of the remote BLE server.
    pRemoteCharacteristicCommand = pRemoteService->getCharacteristic(cmdCharUUID);

    if (pRemoteCharacteristicCommand == nullptr) {
      Serial.print("Failed to find our cnd characteristic UUID: ");
      Serial.println(cmdCharUUID.toString().c_str());
      pClient->disconnect();
      return false;
    }
    Serial.println(" - Found CMD characteristic");
    Serial.println(cmdCharUUID.toString().c_str());

     if (pRemoteCharacteristicCommand->canWrite()) {
        Serial.print("The CMD characteristic can be written to");
    }


    // Obtain a reference to the characteristic in the service of the remote BLE server.
    pRemoteCharacteristicStatus = pRemoteService->getCharacteristic(statusCharUUID);

    if (pRemoteCharacteristicStatus == nullptr) {
      Serial.print("Failed to find our cnd characteristic UUID: ");
      Serial.println(statusCharUUID.toString().c_str());
      pClient->disconnect();
      return false;
    }
    Serial.println(" - Found STATUS characteristic");
    Serial.println(statusCharUUID.toString().c_str());

     if (pRemoteCharacteristicStatus->canRead()) {
        Serial.println("The characteristic value can be read");
        // Read characteristics, is it will force bonding - security
        //pRemoteCharacteristicStatus->readValue();

     }
 
//    if(pRemoteCharacteristicAuth->canNotify())
//      pRemoteCharacteristicAuth->registerForNotify(notifyCallback);

    connected = true;

}
/**
 * Scan for BLE servers and find the first one that advertises the service we are looking for.
 */
class MyAdvertisedDeviceCallbacks: public BLEAdvertisedDeviceCallbacks {
 /**
   * Called for each advertising BLE server.
   */
  void onResult(BLEAdvertisedDevice advertisedDevice) {
    Serial.print("BLE Advertised Device found: ");
    Serial.println(advertisedDevice.toString().c_str());

    // We have found a device, let us now see if it contains the service we are looking for.
    if (advertisedDevice.haveServiceUUID() && advertisedDevice.isAdvertisingService(deviceServiceUUID)) {

      BLEDevice::getScan()->stop();
      myDevice = new BLEAdvertisedDevice(advertisedDevice);
      doConnect = true;
      doScan = true;

    } // Found our server
  } // onResult
}; // MyAdvertisedDeviceCallbacks


// constants won't change. They're used here to set pin numbers:
const int buttonPin = 2;    // the number of the pushbutton pin, should have pullupp/down
const int ledPin = 13;      // the number of the LED pin

// Variables will change:
int ledState = HIGH;         // the current state of the output pin
int buttonState;             // the current reading from the input pin
int lastButtonState = HIGH;   // the previous reading from the input pin, we assume high = not engaged.

// the following variables are unsigned longs because the time, measured in
// milliseconds, will quickly become a bigger number than can be stored in an int.
unsigned long lastDebounceTime = 0;  // the last time the output pin was toggled
unsigned long debounceDelay = 50;    // the debounce time; increase if the output flickers
// Will have an issue if more than 49 days

void initButton( void )
{
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(ledPin, OUTPUT);
  buttonState = LOW;    // Initalize button state
  // set initial LED state
  digitalWrite(ledPin, ledState);
  detectPress();    // Just to make sure we reset any detected state when starting
}

// This returns true once if it detects a keypress
// this triggers on the rising edge, meaning that keybrewing stars when you release the button
int detectPress(void) 
{
  // read the state of the switch into a local variable:
  int fDetectPress = false;
  int inputValue = digitalRead(buttonPin);


  // check to see if you just pressed the button
  // (i.e. the input went from LOW to HIGH), and you've waited long enough
  // since the last press to ignore any noise:

  // If the switch changed, due to noise or pressing:
  if (inputValue != lastButtonState) {
    // reset the debouncing timer
    lastDebounceTime = millis();
  }

  if ((millis() - lastDebounceTime) > debounceDelay) {
    // whatever the reading is at, it's been there for longer than the debounce
    // delay, so take it as the actual current state:

    // if the button state has changed:
    if (inputValue != buttonState) {
      buttonState = inputValue;
      if ( buttonState )
        fDetectPress = true;    // Only detect on rising edge, debounced
    }
  }

  // save the reading. Next time through the loop, it'll be the lastButtonState:
  lastButtonState = inputValue;
  return fDetectPress;
}

void setup() {

  lcd.init();
  // turn on LCD backlight                      
  lcd.backlight();
  lcd.setCursor(0, 0);
  // print message
  lcd.print("Starting!");

  Serial.begin(115200);
  Serial.println("Starting Arduino BLE Client application...");
  Serial.println("NESPRESSO BLE STUFF...");
  BLEDevice::init("");

  // Retrieve a Scanner and set the callback we want to use to be informed when we
  // have detected a new device.  Specify that we want active scanning and start the
  // scan to run for 5 seconds.
  BLEScan* pBLEScan = BLEDevice::getScan();
  pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks());
  pBLEScan->setInterval(1349);
  pBLEScan->setWindow(449);
  pBLEScan->setActiveScan(true);
  pBLEScan->start(5, false);

  // IO pin set
  initButton();

  Serial.println(uxTaskGetStackHighWaterMark(NULL));
  esp_log_level_set("*", ESP_LOG_VERBOSE);
  
} // End of setup.

// Sucker
void byteToAsciiHex( char *stringbuf, const char *buf, int nmbr_bytes)
{
  byte nibble;
  for (int cnt = 0; cnt < nmbr_bytes; cnt++ ) {
    nibble = (buf[cnt] >> 4) & 0x0F;
    stringbuf[cnt*2] = "0123456789abdef"[nibble];
    nibble = buf[cnt] & 0x0F;
    stringbuf[(cnt*2)+1] = "0123456789abdef"[nibble];
  }
  stringbuf[nmbr_bytes*2] = 0x00;
}

int cnt = 0;
// This is the Arduino main loop function.
void loop() {

  // If the flag "doConnect" is true then we have scanned for and found the desired
  // BLE Server with which we wish to connect.  Now we connect to it.  Once we are 
  // connected we set the connected flag to be true.
  if (doConnect == true) {
    if (connectToServer()) {
      uint8_t auth[] = { 0x87, 0x96, 0x08, 0xe2, 0x7c, 0xb1,0xf9,0x6e};

      Serial.println("We are now connected to the BLE Server.");
      lcd.setCursor(0,1);
      lcd.print("Connected!");
      Serial.println("Writing to AUTH\n");
      delay(1000);    // Give the connection some time
      pRemoteCharacteristicAuth->writeValue( auth, sizeof(auth), true );
      delay(2000);
      
      
    } else {
      Serial.println("We have failed to connect to the server; there is nothin more we will do.");
    }
    doConnect = false;
  }

  // If we are connected to a peer BLE Server, update the characteristic each time we are reached
  // with the current time since boot.
  if (connected) {
    
    if ( 0 == cnt ) {    // Just to slow down serial printing
      char val_buf[30];
      String newValue = "Time since boot: " + String(millis()/1000);

      std::string value = pRemoteCharacteristicStatus->readValue();
      Serial.print("The characteristic value was: ");
      Serial.print("Length: ");
      Serial.println(value.length());
      byteToAsciiHex(val_buf, value.c_str(), value.length());
      lcd.cle ar();
      lcd.setCursor(0, 0);
      // print message
      lcd.print(val_buf);
    
      lcd.setCursor(0,1);
      lcd.print("                ");
      lcd.setCursor(0,1);
      Serial.println(val_buf);
      strcpy(val_buf, "S:");
      if ( value[0] & 0x01 ) // Water empty
        strcat(val_buf, "no water ");
 
      if ( 0x84 == (value[1] & 0x84) ) // capsule engage
        strcat(val_buf, "coffe! ");
      if ( 0x04 == (value[1] & 0x84) )
        strcat(val_buf, "water ");
      if ( 0x02 == value[1] )
        strcat(val_buf, "idle");
      Serial.println(val_buf);
      lcd.print(val_buf);
      
    }
    cnt++;
    if ( cnt > 100 ) {
      cnt=0;
    }

    if ( detectPress() ) {
      // Time to brew!
      Serial.println("===================");
      Serial.println("Keypress detected: ");
      // print message
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Brewing coffee");
      
      uint8_t perfectRecipe[] =     { 0x01, 0x10, 0x08, 0x00, 0x00, 0x01, 0x00, 0x82, 0x00, 0x00,0x00};
      uint8_t perfectRecipeBrew[] = { 0x03, 0x05, 0x07, 0x04, 0x00, 0x00, 0x00, 0x00, 0x02, 0x07 };

      

      pRemoteCharacteristicCommand->writeValue( perfectRecipe, sizeof(perfectRecipe), true );
      delay(100);
      pRemoteCharacteristicCommand->writeValue( perfectRecipeBrew, sizeof(perfectRecipeBrew), true );
      delay(1000);

      delay(100);
      
      Serial.println("The perfect brew is about to be delivered");
      Serial.println("===================");

    }

  }else if(doScan){
    BLEDevice::getScan()->start(0);  // this is just eample to start scan after disconnect, most likely there is better way to do it in arduino
    
  }
  
  delay(100); //  a second between loops.
} // End of loop