THE CODE IS NOT WORKING!!!

//ASCII
//SPACE-32
//UNDERSCORE-95

// include the library code:
#include <LiquidCrystal.h>

const int joy1X = 0;
const int joy1Y = 2;
const int joy2X = 4;
const int joy2Y = 6;

const int buttonSpace = 46;
const int buttonEnter = 47;
const int buttonSend = 44;

const int BT_RX = 15;
const int BT_TX = 14;

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(48, 49, 50, 51, 52, 53); //lcd(12, 11, 5, 4, 3, 2);

int gloo;
bool monom;
char uSc = ((char)95);

char mes[16];
char rec[16];

bool isSending=false;

int mesCharNum;

void setup() {
  mesCharNum=0;
  gloo = 0;
  monom = false;
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
  // Print a message to the LCD.

  Serial3.begin(9600);
  Serial.begin(38400);

  mes[0] = uSc;
  for (int q = 1; q < 16; q++) {
    mes[q] = (char)32;
  }
  lcd.setCursor(0, 0);
  lcd.print("ENTER - send");
  lcd.setCursor(0, 1);
  lcd.print("SPACE - receive");
  bool hasChosen=false;
  do{
    delay(10);
    if(digitalRead(buttonEnter)==HIGH){
      isSending=true;
      hasChosen=true;
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Sending");
    }
    if(digitalRead(buttonSpace)==HIGH){
      isSending=false;
      hasChosen=true;
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Receiving");
    }
  }while(!hasChosen);
  delay(2000);
  lcd.clear();
}


void loop() {
  if(isSending){
    lcd.clear();
    // set the cursor to column 0, line 1
    // (note: line 1 is the second row, since counting begins with 0):
    lcd.setCursor(0, 1);
    // print the number of seconds since reset:
    lcd.print(mes);
    lcd.setCursor(8, 0);
    lcd.print((int)analogRead(8));
    lcd.setCursor(0, 0);
    lcd.write(potType());
    //lcd.print(nunu);
    delay(200);

    gloo++;
    if (gloo % 5 == 0) {
      monom = true;
    }

    if (digitalRead(buttonSend) == HIGH) { //SEND
      int err = sendMes();
      while (err == 123) {
        Serial.println("FAILED TO INITIALIZE RECIEVER");
        err = sendMes();
      }
    }
    if (digitalRead(buttonEnter) == HIGH){
      mes[mesCharNum] = potType();
      mes[mesCharNum + 1] = uSc;
      mesCharNum++;
    }
    if(digitalRead(buttonSpace)==HIGH){
      mes[mesCharNum]=' ';
      mes[mesCharNum+1]=uSc;
      mesCharNum++;
    }

  }else{

    //Rec

    lcd.clear();
    int erro;

    while(erro!=30){
      erro = recMes();
    }
    lcd.setCursor(0,0);
    lcd.print(rec);

    lcd.setCursor(0,1);
    lcd.print("ENTER TO RESTART");
    while(digitalRead(47)==LOW);
  }
}

char potType(){
  char readr;
  int ono = analogRead(8);
  int non = map(ono, 0, 1030, 90, 64);
  readr=(char)non;
  return(readr);
}

int sendMes() {
  Serial.println("FORMATTING MESSAGE");
  if(mesCharNum<16){
    for(int i=mesCharNum-1; i<16; i++){
      mes[i]=(char)32;
    }
  }

  Serial.println(mes);

  Serial.println("CHECKING CONNECTION");
  Serial3.flush();
  Serial3.write((char)35);
  while(!(Serial3.available() > 0));
  if((int)Serial3.read()==36){
    Serial.println("CONNECTION SUCESSFUL");
  }else{
    Serial.println("CONNECTION FAILED - RETRYING");
    return(123);
  }

  Serial.print("SENDING MESSAGE: ");
  Serial.println(mes);
  for(int i=0; i<16; i++){
    Serial.print("Sending char ");
    Serial.println(i);
    Serial3.write((char)mes[i]);
    delay(1000);
  }
  Serial.print("SENT");
  delay(1000);
}

int recMes() {

  for(int i=0; i<16; i++){
    rec[i]=0;
  }
  bool hasRec=false;

  while(!hasRec);
  Serial.println("WAITING FOR MESSAGE");
  if (Serial3.available() > 0) {
    if((int)Serial3.read()==35){
      Serial.println("CONNECTION SUCESSFUL - RECEIVING MESSAGE");

      for(int i=0; i<16; i++){
        if (Serial3.available() > 0) {
          rec[i] = Serial3.read();

          Serial.print("RECEIVED CHAR ");
          Serial.print(i);
          Serial.println(" OF 16");

          Serial.print("CHAR: ");
          Serial.println((char)rec[i]);
        }
        else
        {
          i--;
        }
      }

      Serial.print("RECEIVED \"");
      Serial.print(rec);
      Serial.println("\"");
    }
  }else{
    Serial.println("INCORRECT INIT VALUE - WAITING");
  }
}