Homotica - a simple, cost-effective home control system

Create a simple home automation system using Arduino and an Android phone.

May 3, 2017

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Devices & Components

Arduino Uno Rev3

Arduino Ethernet Shield 2

Relay (generic)

Software & Tools

Arduino IDE

Project description

Code

Arduino sketch code

c_cpp

1//Sketch for Homotica Android App
2#include <Homotica.h>
3#include  <Ethernet.h>
4#include <SPI.h>
5#include <RFID.h>
6#include <EthernetUdp.h>
7
8#define  DEBUG_MODE
9#define SKETCH_NAME "HomoticaSketch"
10#define SKETCH_VERSION "1.0"
11#define  ACTIVE_LOW                //delete the line if you're using active_high setup
12
13#ifdef  ACTIVE_LOW
14#define MHIGH 0x0
15#define MLOW  0x1
16#else
17#define MHIGH 0x1
18#define  MLOW  0x0
19#endif
20
21#ifdef DEBUG_MODE
22#define DEBUG_PRINT(x) Serial.print(x)
23#define  DEBUG_PRINTLN(x) Serial.println(x)
24#else
25#define DEBUG_PRINT(x)
26#define  DEBUG_PRINTLN(x)
27#endif
28
29#define SDA_PIN 9
30#define RESET_PIN 8
31
32IPAddress  ip(192, 168, 1, 20);
33byte mac[] = {0x90, 0xA2, 0xDA, 0x0E, 0xBD, 0x21};
34char  Data_RX;
35int PIN, del, charsIndex[4], relayMode;
36static int startingPIN =  4, finishPIN = 7;
37unsigned const int localPort = 80;
38String msg, request,  recivedCode;
39static String code = "abcdefgh";
40
41char packetBuffer[200];
42const  char wrongAuth[] = "2";
43const char positiveResponse[] = "1";
44const char  negativeResponse[] = "0";
45EthernetUDP Udp;
46
47Homotica homotica;
48
49RFID  mRFID(SDA_PIN, RESET_PIN);
50int lastRFIDAction = 0;
51static String allowedCards[]  = {"6C69A3CU89", "77698D5R23"};
52
53static String openDoor = "!7!2!1000!";
54static  String closeDoor = "!6!2!1000!";
55
56void setup() {
57  Ethernet.begin(mac,  ip);
58  Udp.begin(localPort);
59  SPI.begin();
60  mRFID.init();
61
62  Serial.begin(9600);
63  DEBUG_PRINT("UDP is at ");
64  DEBUG_PRINTLN(Ethernet.localIP());
65  DEBUG_PRINTLN("");
66
67  for (int i = startingPIN; i < finishPIN + 1;  i++) {
68    pinMode(i, OUTPUT);
69    digitalWrite(i, MLOW);
70  }
71}
72
73void loop() {
74  checkUDP();
75  checkRFID();
76  homotica.refresh();
77}
78
79void checkUDP() {
80  msg =  "";
81  int packetSize = Udp.parsePacket();
82  if (packetSize) {
83    
84    DEBUG_PRINTLN();
85    DEBUG_PRINTLN("********************NEW INCOMING PACKET**************************");
86    
87    Udp.read(packetBuffer, 200);
88    msg = packetBuffer;
89
90    recivedCode  = msg.substring(msg.indexOf("=") + 1 , msg.indexOf("!"));
91    request = msg.substring(msg.indexOf("?")  + 1 , msg.indexOf("="));
92  
93    if (recivedCode == code) {
94      Udp.beginPacket(Udp.remoteIP(),  Udp.remotePort());
95      String myString = msg.substring(msg.indexOf("!"));
96
97      DEBUG_PRINT("Recived: ");
98      DEBUG_PRINTLN(msg);
99      DEBUG_PRINT("Substring:  ");
100      DEBUG_PRINTLN(myString);
101
102      if (request == "QU") {
103        charsIndex[0] = msg.indexOf("!");
104        charsIndex[1] = msg.indexOf("!",  charsIndex[0] + 1);
105        PIN = msg.substring(charsIndex[0] + 1 , charsIndex[1]).toInt();
106        String sensorReading = String(analogRead(PIN));
107        char output[sensorReading.length()  + 1];
108        sensorReading.toCharArray(output, sensorReading.length() + 1);
109        Udp.write(output);
110      }
111      else if (request == "ST") {
112        Udp.write(positiveResponse);
113        Udp.endPacket();
114        processSingleRunnable(myString);
115      }
116      else if (request == "MT") {
117        Udp.write(positiveResponse);
118        Udp.endPacket();
119        processMultipleRunnable(myString);
120      }
121      else if (request == "CH") {
122        Udp.write(positiveResponse);
123        Udp.endPacket();
124      }
125      else {
126        Udp.write(negativeResponse);
127        Udp.endPacket();
128      }
129    }
130    else{
131      Udp.write(wrongAuth);
132      Udp.endPacket();
133    }
134    for ( int i = 0; i < sizeof(packetBuffer);  ++i ) {
135      packetBuffer[i] = (char)0;
136    }
137  }
138  delay(10);
139}
140
141void  checkRFID() {
142  if (mRFID.isCard()) {
143    mRFID.readCardSerial();
144    String  code = "";
145    for (byte i = 0; i <= 4; i++)
146    {
147      code += String  (mRFID.serNum[i], HEX);
148      code.toUpperCase();
149    }
150    DEBUG_PRINTLN("Read  code:");
151    DEBUG_PRINTLN(code);
152    DEBUG_PRINTLN();
153    
154    for  (String allowedCode : allowedCards) {
155      if (allowedCode == code) {
156        if  (lastRFIDAction == 0) { //checks if the door has been closed or opened the last  time
157          processSingleRunnable(openDoor);
158          lastRFIDAction =  1;
159        } else if (lastRFIDAction == 1) {
160          processSingleRunnable(closeDoor);
161          lastRFIDAction = 0;
162        }
163      }
164    }
165    delay(2000);
166  }
167}
168
169void processSingleRunnable(String msg) {
170  charsIndex[0] = msg.indexOf("!");
171  charsIndex[1] = msg.indexOf("!", charsIndex[0] + 1);
172  charsIndex[2] = msg.indexOf("!",  charsIndex[1] + 1);
173  charsIndex[3] = msg.indexOf("!", charsIndex[2] + 1);
174  
175  PIN = msg.substring(charsIndex[0] + 1 , charsIndex[1]).toInt();
176  relayMode  = msg.substring(charsIndex[1] + 1, charsIndex[2]).toInt();
177  del = msg.substring(charsIndex[2]  + 1, charsIndex[3]).toInt();
178
179  DEBUG_PRINTLN();
180  DEBUG_PRINTLN("- OPENING  -");
181  DEBUG_PRINT("Pin: ");
182  DEBUG_PRINT(String(PIN));
183  DEBUG_PRINT(";  Mode: ");
184  DEBUG_PRINT(String(relayMode));
185  DEBUG_PRINT("; Delay: ");
186  DEBUG_PRINTLN(msg.substring(charsIndex[2] + 1, charsIndex[3]));
187  DEBUG_PRINTLN("(0  --> ON, 1 --> OFF, 2 --> PUSH, 3 --> TOGGLE)");
188
189  if (0 <= relayMode <=  2 && startingPIN <= PIN <= finishPIN)
190  {
191    if (relayMode == 0) {
192      digitalWrite(PIN,  MHIGH); //relay on
193    }
194    else if (relayMode == 1) {
195      digitalWrite(PIN,  MLOW);
196    }
197    else if (relayMode == 2) {
198      homotica.pushPin(PIN,  del, digitalRead(PIN));
199    }
200    else if (relayMode == 3) {
201      digitalWrite(PIN,  !digitalRead(PIN));
202    }
203  }
204}
205
206void processMultipleRunnable(String  msg) {
207  char input[msg.length() + 1];
208  msg.toCharArray(input, msg.length()  + 1);
209  const char* divider = ("+");
210  int lastIndex = 0;
211  for (int  k = 0; k < sizeof(input); k++) {
212    if (String(input[k]) == "+") {
213      processSingleRunnable(msg.substring(lastIndex,  k));
214      k += 1;
215      lastIndex = k;
216    }
217  }
218}
219

//Sketch for Homotica Android App
#include <Homotica.h>
#include  <Ethernet.h>
#include <SPI.h>
#include <RFID.h>
#include <EthernetUdp.h>

#define  DEBUG_MODE
#define SKETCH_NAME "HomoticaSketch"
#define SKETCH_VERSION "1.0"
#define  ACTIVE_LOW                //delete the line if you're using active_high setup

#ifdef  ACTIVE_LOW
#define MHIGH 0x0
#define MLOW  0x1
#else
#define MHIGH 0x1
#define  MLOW  0x0
#endif

#ifdef DEBUG_MODE
#define DEBUG_PRINT(x) Serial.print(x)
#define  DEBUG_PRINTLN(x) Serial.println(x)
#else
#define DEBUG_PRINT(x)
#define  DEBUG_PRINTLN(x)
#endif

#define SDA_PIN 9
#define RESET_PIN 8

IPAddress  ip(192, 168, 1, 20);
byte mac[] = {0x90, 0xA2, 0xDA, 0x0E, 0xBD, 0x21};
char  Data_RX;
int PIN, del, charsIndex[4], relayMode;
static int startingPIN =  4, finishPIN = 7;
unsigned const int localPort = 80;
String msg, request,  recivedCode;
static String code = "abcdefgh";

char packetBuffer[200];
const  char wrongAuth[] = "2";
const char positiveResponse[] = "1";
const char  negativeResponse[] = "0";
EthernetUDP Udp;

Homotica homotica;

RFID  mRFID(SDA_PIN, RESET_PIN);
int lastRFIDAction = 0;
static String allowedCards[]  = {"6C69A3CU89", "77698D5R23"};

static String openDoor = "!7!2!1000!";
static  String closeDoor = "!6!2!1000!";

void setup() {
  Ethernet.begin(mac,  ip);
  Udp.begin(localPort);
  SPI.begin();
  mRFID.init();

  Serial.begin(9600);
  DEBUG_PRINT("UDP is at ");
  DEBUG_PRINTLN(Ethernet.localIP());
  DEBUG_PRINTLN("");

  for (int i = startingPIN; i < finishPIN + 1;  i++) {
    pinMode(i, OUTPUT);
    digitalWrite(i, MLOW);
  }
}

void loop() {
  checkUDP();
  checkRFID();
  homotica.refresh();
}

void checkUDP() {
  msg =  "";
  int packetSize = Udp.parsePacket();
  if (packetSize) {
    
    DEBUG_PRINTLN();
    DEBUG_PRINTLN("********************NEW INCOMING PACKET**************************");
    
    Udp.read(packetBuffer, 200);
    msg = packetBuffer;

    recivedCode  = msg.substring(msg.indexOf("=") + 1 , msg.indexOf("!"));
    request = msg.substring(msg.indexOf("?")  + 1 , msg.indexOf("="));
  
    if (recivedCode == code) {
      Udp.beginPacket(Udp.remoteIP(),  Udp.remotePort());
      String myString = msg.substring(msg.indexOf("!"));

      DEBUG_PRINT("Recived: ");
      DEBUG_PRINTLN(msg);
      DEBUG_PRINT("Substring:  ");
      DEBUG_PRINTLN(myString);

      if (request == "QU") {
        charsIndex[0] = msg.indexOf("!");
        charsIndex[1] = msg.indexOf("!",  charsIndex[0] + 1);
        PIN = msg.substring(charsIndex[0] + 1 , charsIndex[1]).toInt();
        String sensorReading = String(analogRead(PIN));
        char output[sensorReading.length()  + 1];
        sensorReading.toCharArray(output, sensorReading.length() + 1);
        Udp.write(output);
      }
      else if (request == "ST") {
        Udp.write(positiveResponse);
        Udp.endPacket();
        processSingleRunnable(myString);
      }
      else if (request == "MT") {
        Udp.write(positiveResponse);
        Udp.endPacket();
        processMultipleRunnable(myString);
      }
      else if (request == "CH") {
        Udp.write(positiveResponse);
        Udp.endPacket();
      }
      else {
        Udp.write(negativeResponse);
        Udp.endPacket();
      }
    }
    else{
      Udp.write(wrongAuth);
      Udp.endPacket();
    }
    for ( int i = 0; i < sizeof(packetBuffer);  ++i ) {
      packetBuffer[i] = (char)0;
    }
  }
  delay(10);
}

void  checkRFID() {
  if (mRFID.isCard()) {
    mRFID.readCardSerial();
    String  code = "";
    for (byte i = 0; i <= 4; i++)
    {
      code += String  (mRFID.serNum[i], HEX);
      code.toUpperCase();
    }
    DEBUG_PRINTLN("Read  code:");
    DEBUG_PRINTLN(code);
    DEBUG_PRINTLN();
    
    for  (String allowedCode : allowedCards) {
      if (allowedCode == code) {
        if  (lastRFIDAction == 0) { //checks if the door has been closed or opened the last  time
          processSingleRunnable(openDoor);
          lastRFIDAction =  1;
        } else if (lastRFIDAction == 1) {
          processSingleRunnable(closeDoor);
          lastRFIDAction = 0;
        }
      }
    }
    delay(2000);
  }
}

void processSingleRunnable(String msg) {
  charsIndex[0] = msg.indexOf("!");
  charsIndex[1] = msg.indexOf("!", charsIndex[0] + 1);
  charsIndex[2] = msg.indexOf("!",  charsIndex[1] + 1);
  charsIndex[3] = msg.indexOf("!", charsIndex[2] + 1);
  
  PIN = msg.substring(charsIndex[0] + 1 , charsIndex[1]).toInt();
  relayMode  = msg.substring(charsIndex[1] + 1, charsIndex[2]).toInt();
  del = msg.substring(charsIndex[2]  + 1, charsIndex[3]).toInt();

  DEBUG_PRINTLN();
  DEBUG_PRINTLN("- OPENING  -");
  DEBUG_PRINT("Pin: ");
  DEBUG_PRINT(String(PIN));
  DEBUG_PRINT(";  Mode: ");
  DEBUG_PRINT(String(relayMode));
  DEBUG_PRINT("; Delay: ");
  DEBUG_PRINTLN(msg.substring(charsIndex[2] + 1, charsIndex[3]));
  DEBUG_PRINTLN("(0  --> ON, 1 --> OFF, 2 --> PUSH, 3 --> TOGGLE)");

  if (0 <= relayMode <=  2 && startingPIN <= PIN <= finishPIN)
  {
    if (relayMode == 0) {
      digitalWrite(PIN,  MHIGH); //relay on
    }
    else if (relayMode == 1) {
      digitalWrite(PIN,  MLOW);
    }
    else if (relayMode == 2) {
      homotica.pushPin(PIN,  del, digitalRead(PIN));
    }
    else if (relayMode == 3) {
      digitalWrite(PIN,  !digitalRead(PIN));
    }
  }
}

void processMultipleRunnable(String  msg) {
  char input[msg.length() + 1];
  msg.toCharArray(input, msg.length()  + 1);
  const char* divider = ("+");
  int lastIndex = 0;
  for (int  k = 0; k < sizeof(input); k++) {
    if (String(input[k]) == "+") {
      processSingleRunnable(msg.substring(lastIndex,  k));
      k += 1;
      lastIndex = k;
    }
  }
}

Homotica library

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Arduino sketch code

c_cpp

1//Sketch for Homotica Android App
2#include <Homotica.h>
3#include
4  <Ethernet.h>
5#include <SPI.h>
6#include <RFID.h>
7#include <EthernetUdp.h>
8
9#define
10  DEBUG_MODE
11#define SKETCH_NAME "HomoticaSketch"
12#define SKETCH_VERSION "1.0"
13#define
14  ACTIVE_LOW                //delete the line if you're using active_high setup
15
16#ifdef
17  ACTIVE_LOW
18#define MHIGH 0x0
19#define MLOW  0x1
20#else
21#define MHIGH 0x1
22#define
23  MLOW  0x0
24#endif
25
26#ifdef DEBUG_MODE
27#define DEBUG_PRINT(x) Serial.print(x)
28#define
29  DEBUG_PRINTLN(x) Serial.println(x)
30#else
31#define DEBUG_PRINT(x)
32#define
33  DEBUG_PRINTLN(x)
34#endif
35
36#define SDA_PIN 9
37#define RESET_PIN 8
38
39IPAddress
40  ip(192, 168, 1, 20);
41byte mac[] = {0x90, 0xA2, 0xDA, 0x0E, 0xBD, 0x21};
42char
43  Data_RX;
44int PIN, del, charsIndex[4], relayMode;
45static int startingPIN =
46  4, finishPIN = 7;
47unsigned const int localPort = 80;
48String msg, request,
49  recivedCode;
50static String code = "abcdefgh";
51
52char packetBuffer[200];
53const
54  char wrongAuth[] = "2";
55const char positiveResponse[] = "1";
56const char
57  negativeResponse[] = "0";
58EthernetUDP Udp;
59
60Homotica homotica;
61
62RFID
63  mRFID(SDA_PIN, RESET_PIN);
64int lastRFIDAction = 0;
65static String allowedCards[]
66  = {"6C69A3CU89", "77698D5R23"};
67
68static String openDoor = "!7!2!1000!";
69static
70  String closeDoor = "!6!2!1000!";
71
72void setup() {
73  Ethernet.begin(mac,
74  ip);
75  Udp.begin(localPort);
76  SPI.begin();
77  mRFID.init();
78
79  Serial.begin(9600);
80
81  DEBUG_PRINT("UDP is at ");
82  DEBUG_PRINTLN(Ethernet.localIP());
83  DEBUG_PRINTLN("");
84
85
86  for (int i = startingPIN; i < finishPIN + 1;  i++) {
87    pinMode(i, OUTPUT);
88
89    digitalWrite(i, MLOW);
90  }
91}
92
93void loop() {
94  checkUDP();
95
96  checkRFID();
97  homotica.refresh();
98}
99
100void checkUDP() {
101  msg =
102  "";
103  int packetSize = Udp.parsePacket();
104  if (packetSize) {
105    
106
107    DEBUG_PRINTLN();
108    DEBUG_PRINTLN("********************NEW INCOMING PACKET**************************");
109
110    
111    Udp.read(packetBuffer, 200);
112    msg = packetBuffer;
113
114    recivedCode
115  = msg.substring(msg.indexOf("=") + 1 , msg.indexOf("!"));
116    request = msg.substring(msg.indexOf("?")
117  + 1 , msg.indexOf("="));
118  
119    if (recivedCode == code) {
120      Udp.beginPacket(Udp.remoteIP(),
121  Udp.remotePort());
122      String myString = msg.substring(msg.indexOf("!"));
123
124
125      DEBUG_PRINT("Recived: ");
126      DEBUG_PRINTLN(msg);
127      DEBUG_PRINT("Substring:
128  ");
129      DEBUG_PRINTLN(myString);
130
131      if (request == "QU") {
132
133        charsIndex[0] = msg.indexOf("!");
134        charsIndex[1] = msg.indexOf("!",
135  charsIndex[0] + 1);
136        PIN = msg.substring(charsIndex[0] + 1 , charsIndex[1]).toInt();
137
138        String sensorReading = String(analogRead(PIN));
139        char output[sensorReading.length()
140  + 1];
141        sensorReading.toCharArray(output, sensorReading.length() + 1);
142
143        Udp.write(output);
144      }
145      else if (request == "ST") {
146
147        Udp.write(positiveResponse);
148        Udp.endPacket();
149        processSingleRunnable(myString);
150
151      }
152      else if (request == "MT") {
153        Udp.write(positiveResponse);
154
155        Udp.endPacket();
156        processMultipleRunnable(myString);
157      }
158
159      else if (request == "CH") {
160        Udp.write(positiveResponse);
161
162        Udp.endPacket();
163      }
164      else {
165        Udp.write(negativeResponse);
166
167        Udp.endPacket();
168      }
169    }
170    else{
171      Udp.write(wrongAuth);
172
173      Udp.endPacket();
174    }
175    for ( int i = 0; i < sizeof(packetBuffer);
176  ++i ) {
177      packetBuffer[i] = (char)0;
178    }
179  }
180  delay(10);
181}
182
183void
184  checkRFID() {
185  if (mRFID.isCard()) {
186    mRFID.readCardSerial();
187    String
188  code = "";
189    for (byte i = 0; i <= 4; i++)
190    {
191      code += String
192  (mRFID.serNum[i], HEX);
193      code.toUpperCase();
194    }
195    DEBUG_PRINTLN("Read
196  code:");
197    DEBUG_PRINTLN(code);
198    DEBUG_PRINTLN();
199    
200    for
201  (String allowedCode : allowedCards) {
202      if (allowedCode == code) {
203        if
204  (lastRFIDAction == 0) { //checks if the door has been closed or opened the last
205  time
206          processSingleRunnable(openDoor);
207          lastRFIDAction =
208  1;
209        } else if (lastRFIDAction == 1) {
210          processSingleRunnable(closeDoor);
211
212          lastRFIDAction = 0;
213        }
214      }
215    }
216    delay(2000);
217
218  }
219}
220
221void processSingleRunnable(String msg) {
222  charsIndex[0] = msg.indexOf("!");
223
224  charsIndex[1] = msg.indexOf("!", charsIndex[0] + 1);
225  charsIndex[2] = msg.indexOf("!",
226  charsIndex[1] + 1);
227  charsIndex[3] = msg.indexOf("!", charsIndex[2] + 1);
228
229  
230  PIN = msg.substring(charsIndex[0] + 1 , charsIndex[1]).toInt();
231  relayMode
232  = msg.substring(charsIndex[1] + 1, charsIndex[2]).toInt();
233  del = msg.substring(charsIndex[2]
234  + 1, charsIndex[3]).toInt();
235
236  DEBUG_PRINTLN();
237  DEBUG_PRINTLN("- OPENING
238  -");
239  DEBUG_PRINT("Pin: ");
240  DEBUG_PRINT(String(PIN));
241  DEBUG_PRINT(";
242  Mode: ");
243  DEBUG_PRINT(String(relayMode));
244  DEBUG_PRINT("; Delay: ");
245
246  DEBUG_PRINTLN(msg.substring(charsIndex[2] + 1, charsIndex[3]));
247  DEBUG_PRINTLN("(0
248  --> ON, 1 --> OFF, 2 --> PUSH, 3 --> TOGGLE)");
249
250  if (0 <= relayMode <=
251  2 && startingPIN <= PIN <= finishPIN)
252  {
253    if (relayMode == 0) {
254      digitalWrite(PIN,
255  MHIGH); //relay on
256    }
257    else if (relayMode == 1) {
258      digitalWrite(PIN,
259  MLOW);
260    }
261    else if (relayMode == 2) {
262      homotica.pushPin(PIN,
263  del, digitalRead(PIN));
264    }
265    else if (relayMode == 3) {
266      digitalWrite(PIN,
267  !digitalRead(PIN));
268    }
269  }
270}
271
272void processMultipleRunnable(String
273  msg) {
274  char input[msg.length() + 1];
275  msg.toCharArray(input, msg.length()
276  + 1);
277  const char* divider = ("+");
278  int lastIndex = 0;
279  for (int
280  k = 0; k < sizeof(input); k++) {
281    if (String(input[k]) == "+") {
282      processSingleRunnable(msg.substring(lastIndex,
283  k));
284      k += 1;
285      lastIndex = k;
286    }
287  }
288}
289

//Sketch for Homotica Android App
#include <Homotica.h>
#include
  <Ethernet.h>
#include <SPI.h>
#include <RFID.h>
#include <EthernetUdp.h>

#define
  DEBUG_MODE
#define SKETCH_NAME "HomoticaSketch"
#define SKETCH_VERSION "1.0"
#define
  ACTIVE_LOW                //delete the line if you're using active_high setup

#ifdef
  ACTIVE_LOW
#define MHIGH 0x0
#define MLOW  0x1
#else
#define MHIGH 0x1
#define
  MLOW  0x0
#endif

#ifdef DEBUG_MODE
#define DEBUG_PRINT(x) Serial.print(x)
#define
  DEBUG_PRINTLN(x) Serial.println(x)
#else
#define DEBUG_PRINT(x)
#define
  DEBUG_PRINTLN(x)
#endif

#define SDA_PIN 9
#define RESET_PIN 8

IPAddress
  ip(192, 168, 1, 20);
byte mac[] = {0x90, 0xA2, 0xDA, 0x0E, 0xBD, 0x21};
char
  Data_RX;
int PIN, del, charsIndex[4], relayMode;
static int startingPIN =
  4, finishPIN = 7;
unsigned const int localPort = 80;
String msg, request,
  recivedCode;
static String code = "abcdefgh";

char packetBuffer[200];
const
  char wrongAuth[] = "2";
const char positiveResponse[] = "1";
const char
  negativeResponse[] = "0";
EthernetUDP Udp;

Homotica homotica;

RFID
  mRFID(SDA_PIN, RESET_PIN);
int lastRFIDAction = 0;
static String allowedCards[]
  = {"6C69A3CU89", "77698D5R23"};

static String openDoor = "!7!2!1000!";
static
  String closeDoor = "!6!2!1000!";

void setup() {
  Ethernet.begin(mac,
  ip);
  Udp.begin(localPort);
  SPI.begin();
  mRFID.init();

  Serial.begin(9600);

  DEBUG_PRINT("UDP is at ");
  DEBUG_PRINTLN(Ethernet.localIP());
  DEBUG_PRINTLN("");


  for (int i = startingPIN; i < finishPIN + 1;  i++) {
    pinMode(i, OUTPUT);

    digitalWrite(i, MLOW);
  }
}

void loop() {
  checkUDP();

  checkRFID();
  homotica.refresh();
}

void checkUDP() {
  msg =
  "";
  int packetSize = Udp.parsePacket();
  if (packetSize) {
    

    DEBUG_PRINTLN();
    DEBUG_PRINTLN("********************NEW INCOMING PACKET**************************");

    
    Udp.read(packetBuffer, 200);
    msg = packetBuffer;

    recivedCode
  = msg.substring(msg.indexOf("=") + 1 , msg.indexOf("!"));
    request = msg.substring(msg.indexOf("?")
  + 1 , msg.indexOf("="));
  
    if (recivedCode == code) {
      Udp.beginPacket(Udp.remoteIP(),
  Udp.remotePort());
      String myString = msg.substring(msg.indexOf("!"));


      DEBUG_PRINT("Recived: ");
      DEBUG_PRINTLN(msg);
      DEBUG_PRINT("Substring:
  ");
      DEBUG_PRINTLN(myString);

      if (request == "QU") {

        charsIndex[0] = msg.indexOf("!");
        charsIndex[1] = msg.indexOf("!",
  charsIndex[0] + 1);
        PIN = msg.substring(charsIndex[0] + 1 , charsIndex[1]).toInt();

        String sensorReading = String(analogRead(PIN));
        char output[sensorReading.length()
  + 1];
        sensorReading.toCharArray(output, sensorReading.length() + 1);

        Udp.write(output);
      }
      else if (request == "ST") {

        Udp.write(positiveResponse);
        Udp.endPacket();
        processSingleRunnable(myString);

      }
      else if (request == "MT") {
        Udp.write(positiveResponse);

        Udp.endPacket();
        processMultipleRunnable(myString);
      }

      else if (request == "CH") {
        Udp.write(positiveResponse);

        Udp.endPacket();
      }
      else {
        Udp.write(negativeResponse);

        Udp.endPacket();
      }
    }
    else{
      Udp.write(wrongAuth);

      Udp.endPacket();
    }
    for ( int i = 0; i < sizeof(packetBuffer);
  ++i ) {
      packetBuffer[i] = (char)0;
    }
  }
  delay(10);
}

void
  checkRFID() {
  if (mRFID.isCard()) {
    mRFID.readCardSerial();
    String
  code = "";
    for (byte i = 0; i <= 4; i++)
    {
      code += String
  (mRFID.serNum[i], HEX);
      code.toUpperCase();
    }
    DEBUG_PRINTLN("Read
  code:");
    DEBUG_PRINTLN(code);
    DEBUG_PRINTLN();
    
    for
  (String allowedCode : allowedCards) {
      if (allowedCode == code) {
        if
  (lastRFIDAction == 0) { //checks if the door has been closed or opened the last
  time
          processSingleRunnable(openDoor);
          lastRFIDAction =
  1;
        } else if (lastRFIDAction == 1) {
          processSingleRunnable(closeDoor);

          lastRFIDAction = 0;
        }
      }
    }
    delay(2000);

  }
}

void processSingleRunnable(String msg) {
  charsIndex[0] = msg.indexOf("!");

  charsIndex[1] = msg.indexOf("!", charsIndex[0] + 1);
  charsIndex[2] = msg.indexOf("!",
  charsIndex[1] + 1);
  charsIndex[3] = msg.indexOf("!", charsIndex[2] + 1);

  
  PIN = msg.substring(charsIndex[0] + 1 , charsIndex[1]).toInt();
  relayMode
  = msg.substring(charsIndex[1] + 1, charsIndex[2]).toInt();
  del = msg.substring(charsIndex[2]
  + 1, charsIndex[3]).toInt();

  DEBUG_PRINTLN();
  DEBUG_PRINTLN("- OPENING
  -");
  DEBUG_PRINT("Pin: ");
  DEBUG_PRINT(String(PIN));
  DEBUG_PRINT(";
  Mode: ");
  DEBUG_PRINT(String(relayMode));
  DEBUG_PRINT("; Delay: ");

  DEBUG_PRINTLN(msg.substring(charsIndex[2] + 1, charsIndex[3]));
  DEBUG_PRINTLN("(0
  --> ON, 1 --> OFF, 2 --> PUSH, 3 --> TOGGLE)");

  if (0 <= relayMode <=
  2 && startingPIN <= PIN <= finishPIN)
  {
    if (relayMode == 0) {
      digitalWrite(PIN,
  MHIGH); //relay on
    }
    else if (relayMode == 1) {
      digitalWrite(PIN,
  MLOW);
    }
    else if (relayMode == 2) {
      homotica.pushPin(PIN,
  del, digitalRead(PIN));
    }
    else if (relayMode == 3) {
      digitalWrite(PIN,
  !digitalRead(PIN));
    }
  }
}

void processMultipleRunnable(String
  msg) {
  char input[msg.length() + 1];
  msg.toCharArray(input, msg.length()
  + 1);
  const char* divider = ("+");
  int lastIndex = 0;
  for (int
  k = 0; k < sizeof(input); k++) {
    if (String(input[k]) == "+") {
      processSingleRunnable(msg.substring(lastIndex,
  k));
      k += 1;
      lastIndex = k;
    }
  }
}

Homotica library

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Wiring diagram

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