Handshake Three Way with Arduino

README.md

#Handshake Three Way with Arduino#

##Author##

• Author: Domenico Monaco
• e-mail: hack AT kiuz.it
• Site: http://monaco.kiuz.it

Description

• Simple Handshake Three Way with Arduino over Serial communication

Special Thanks

Dependencies

//TODO

Changes

//TODO

Installation

//TODO

HandshakeThreeWay.ino

/**
 *
 * Author: Domenico Monaco - hack@kiuz.it
 *
 * Description: 
 *   Simple Handshake Three Way with Arduino over Serial communication
 *
 * License: GNU v2 2014
 **/


int SYNIN = 0;
int SYNOUT = 0;
bool SYN_CHECK = false;
String SYNID  ="SYN" ;

bool SYN_RECIVED = false;

int ACKIN = 0;
int ACKOUT = 0;
bool ACK_CHECK = false;
String ACKID  ="ACK" ;
bool ACK_RECIVED = false;

String MESIN = "";
String MESOUT = "";
bool MES_CHECK = false;
String MESID  ="MES";
bool MES_RECIVED = false;

int incomingByte = 0;    // for incoming serial data

long int timeStartCom = 0;
long int timeEndCom = 0;

long int charsIN = 0;
bool waiting = false;

String line="";

void setup() {
    Serial.begin(115200);
}

void loop() {
  if(SYN_RECIVED==true&&ACK_RECIVED==true&&MES_RECIVED==true){
    readLine();
  }else{
    readLine();
    handeShake();
  }
}

void handeShake(){

  if(line.length()!=0 && waiting==true){
    int n_SYN= line.indexOf("SYN");
    //Serial.println(n_SYN);
    
    int n_ACK=line.indexOf("ACK");
    //Serial.println(n_ACK);
    
    int n_MES=line.indexOf("MES");
    //Serial.println(n_MES);   
   
    int n_end = line.indexOf(";");
    //Serial.println(n_end);
    
    SYN_CHECK = false;
    
    if(n_SYN==0&&n_ACK==-1&&n_MES==-1&&n_end==7){
      Serial.println("Detected SYN message");
      
      check_SYN();
            
      if(SYN_CHECK==true){
        
        SYNIN = line.substring(4,7).toInt();
        SYNOUT = SYNIN + 1;
        
        Serial.println("Checked valid Syn;");
       
        SYN_RECIVED = true;
        
        ACKOUT = random(100, 900);
         
        String output = SYNID + " " + SYNOUT + " "+ ACKID + " " + ACKOUT +";";
        Serial.println(output);
        
      }else{
        SYN_RECIVED = false;
        Serial.print("Checked not valid Syn;");
      }
       
    
  }else if(n_SYN==0&&n_ACK==8&&n_MES==-1&&n_end==15&&check_SYN()==true&&SYN_RECIVED==true){
    
      Serial.println("Detected ACK message");
    
      check_ACK();  
     
      if(ACK_CHECK==true){
        Serial.println("Checked valid ACK;");
         ACK_RECIVED = true;
        
        MESOUT = "OK";
        
        String output = SYNID + " " + SYNOUT + ","+ ACKID + " " + ACKIN + "," + MESID  + " " + MESOUT + ";";
        Serial.println(output);
        
      }else{
        ACK_RECIVED = false;
        SYN_RECIVED = false;
        Serial.print("Checked not valid ACK;");
      }
      
      
    }else if(n_SYN==0&&n_ACK==8&&n_MES==16&&n_end>20&&check_ACK()==true&&ACK_RECIVED==true){
      
      Serial.println("Detected MES message");
      check_MES();
      
        if(MES_CHECK==true){
          Serial.println("Checked valid MES;");
          MES_RECIVED = true;
          
          Serial.println("Are you allowed to communicate with me! ");
        }else{
          Serial.println("Checked not valid MES;");
        }
    
    }else{
      Serial.println("Not valid message.");
    }
  }
}


void readLine(){

  // send data only when you receive data:
  if (Serial.available() > 0) {
    

    
    if(charsIN==(long int)0){
      
      //line = "";
      
      timeStartCom = millis();
      timeEndCom = 0;
      
      waiting = false;
    }
    charsIN++;
    
    incomingByte = Serial.read();
    line = line + (char)incomingByte;
    
    delay(1); //Delay of Serial transfer
  }else{
    
    if(waiting==false){
      waiting = true;

      timeEndCom = millis();
      
      ///PRINT PREVUOUS MESSAGE 
      Serial.print("Message: ");
      Serial.println(line);
      
      Serial.print("Recived ");
      Serial.print(charsIN);
      Serial.print("chars in ");
      Serial.print(timeEndCom-timeStartCom);
      Serial.print("millis; ");
      Serial.print((float)(timeEndCom-timeStartCom)/charsIN);
      Serial.print(" mills for chars;");
      Serial.print(" ");
      Serial.print((float)charsIN/(timeEndCom-timeStartCom));
      Serial.println("char/millis;");


      timeStartCom = 0;
      charsIN = (long int)0;

      Serial.println("");
      Serial.println("Waiting for message...");
      Serial.println("");
    }else{
    
    //in a seconde cicle reset line
    line="";   }
  }
}


bool check_SYN(){
  for(int i=4;i<=6;i++){
    if(isDigit(line.charAt(i))==true){
      SYN_CHECK=true;
    }else{
     SYN_CHECK = false;
     break;
    }
  }
  return SYN_CHECK;
}

bool check_ACK(){
  for(int i=12;i<=14;i++){
    if(isDigit(line.charAt(i))==true){
      ACK_CHECK=true;
    }else{
      ACK_CHECK = false;
      break;
    }
  }
  if(ACK_CHECK==true){
    SYNIN = line.substring(4,7).toInt();
    ACKIN = line.substring(12,15).toInt();
    
    if(SYNIN!=(SYNOUT)&&ACKOUT!=(ACKIN-1)){
      ACK_CHECK = false; 
    }else if(SYNIN==(SYNOUT)&&ACKOUT==(ACKIN-1)){
    ACK_CHECK = true; 
    }else{
    ACK_CHECK = false; 
    }
  }
  return ACK_CHECK;
}

bool check_MES(){

    SYNIN = line.substring(4,7).toInt();
    ACKIN = line.substring(12,15).toInt();
    MESIN = line.substring(20,line.length()-1);

    if(SYNIN!=(SYNOUT)&&ACKOUT!=(ACKIN-1)&&MESIN!=MESOUT){
      MES_CHECK = false;
    }else if(SYNIN==(SYNOUT)&&ACKOUT==(ACKIN-1)&&MESIN==MESOUT){
      MES_CHECK = true; 
    }else{
      MES_CHECK = false; 
    }

  return MES_CHECK;
}