const byte STX = 0x02;
const byte ETX = 0x03;

char RXMSG[10];
char VER[3];
char MSG[3];
int i = 0;

char iwillplay[5];
char iwillrecord[5];

void setup()
{
  Serial.begin(9600);

  Serial.print("e-Gizmo Voice recorder software version: ");
  Serial.println(swversion());
  Serial.print("Current number of messages: ");
  Serial.println(msg_number());
  resets();
  delay(5000);
  Serial.println("Begin recording!");
  record();
  stops(3000);
  Serial.println("Now playing.");
  play(1);
  delay(3000);
  stops(10);
  Serial.println("Test succesful");

}

void loop()
{

}

void stops(int stopper)
{
  delay(stopper);
  Serial1.write(STX);
  Serial1.write("S");
  Serial1.write(ETX);
  rxread();
  rxclear();
}

void resets()
{
  Serial1.write(STX);
  Serial1.write("X");
  Serial1.write(ETX);
  rxread();
  rxclear();
  if(msg_number() == 0)
  {
    Serial.println("All recordings removed!");
  }     
}

String swversion()
{
  Serial1.write(STX);
  Serial1.write("V");
  Serial1.write(ETX);
  delay(100);
  rxread();

  for(int i = 0; i<= 3; i++)
  {
    VER[i] = RXMSG[i];
  }

  delay(50);
  String swversion(VER);
  return swversion;
  rxclear();

}

int msg_number()
{
  Serial1.write(STX);
  Serial1.write("M");
  Serial1.write(ETX);
  delay(100);
  rxread();

  for(int i =1; i<=3; i++)
  {
    MSG[i] = RXMSG[i];
  }
  delay(50);
  String msg(MSG);
  int number =  msg.toInt();

  return number;

  rxclear();
}

void play(int number)
{
  itoa(number,iwillplay,5);

  Serial1.write(STX);
  Serial1.write("P");
  Serial1.write(iwillplay);
  Serial1.write(ETX);

  rxread();
  delay(50);
  rxclear();
}

void recordover(int number)
{
  itoa(number,iwillrecord,5);

  Serial1.write(STX);
  Serial1.write("R");
  Serial1.write(iwillrecord);
  Serial1.write(ETX);
  rxread();
  delay(50);
  rxclear();
}

void record()
{
  Serial1.write(STX);
  Serial1.write("R");
  Serial1.write(ETX);
  rxread();
  delay(50);
  rxclear();
}



void rxread()
{  
  i = 0;

  while (Serial1.available()) 
  {
    RXMSG[i] = (char)Serial1.read();
    i++; 
  }  

}

void rxclear()
{

  for(int i = 0; i<= 10; i++)
  {
    RXMSG[i] = 0;
  }

}