Processing Talsk Arduino - Basic Commands Comunication

gistfile1.ino

String inputString = "";         // a string to hold incoming data
boolean commandComplete = false;  // whether the string is complete

int somethingGlobal = 100;

void setup() {
  // initialize serial:
  Serial.begin(9600);
  // reserve 200 bytes for the inputString:
  inputString.reserve(200);
}

void loop() {
  // checkCommands and run
  checkCommands();
}


void checkCommands() {
  if (Serial.available()) {
    char inChar = (char)Serial.read(); 
    // add it to the inputString:
    inputString += inChar;
    // if the incoming character is a newline, set a flag
    // so the main loop can do something about it:
    if (inChar == '\n') {
      commandComplete = true;
    } 
  }

  if (commandComplete) {
    // not really optimize on strings but easier to learn
    // get the first character of the string which is the commands
    char command = inputString.substring(0,1).charAt(0);
    // get the rest of the string which is the integer value
    int value = inputString.substring(1).toInt();
    // clean the string to receive more commands
    inputString = "";
    // set the commands complete to false
    commandComplete = false;
    // execute the received commands with the attached value
    runCommand(command, value);
    
  }
}

void runCommand(char commands, int value){
  switch (commands) {
  case 'A':   
    Serial.print("COMMAND A "); 
    Serial.println(value);  
    updateSomething(value);
    break;
  case 'B':    
    Serial.print("COMMAND B "); 
    Serial.println(value);
    doSomething(value);
    break;
  case 'C':    
    /*
    Here any function you want to run
    
    */
    break;
  }
}


void doSomething(int value){
  delay(value);
}

void updateSomething(int value){
  somethingGlobal = value;
}

gistfile2.pde

import processing.serial.*;

Serial myPort;  // Create object from Serial class
int val;        // Data received from the serial port

void setup() 
{
  size(200, 200);
// I know that the first port in the serial list on my mac
  // is always my  FTDI adaptor, so I open Serial.list()[5].
  // On Windows machines, this generally opens COM1.
  // Open whatever port is the one you're using.
  String[] portsAvailable = Serial.list();           // Get a List of all the serial ports available
  for (int i=0; i <  portsAvailable.length; i++) {   // Iterate over the list and print them on console for selection
    print("[" + i + "]\t");    
    println(portsAvailable[i]);                       
  }
  String portName = portsAvailable[5];               // "5" is our selection            
  myPort = new Serial(this, portName, 9600);         // Connect to the specified port
}

void draw() {
  sendCMD('A', 100); // Send Command A with value 100
}

 
public void sendCMD(char cmd, int value) { 
  print("SENDING CMD: ");
  print(cmd);
  print(" VALUE: ");
  print(value);
  print(" >> ");
  print(cmd);     
  println(str(value));
  myPort.write(cmd);     
  myPort.write(String.valueOf(value));
  myPort.write('\n');
}

void serialEvent(Serial myPort) {
   String myString = myPort.readStringUntil('\n');
    if(myString != null) {
      print("RECEIVD CMD: ");
      println(myString);
    }
}