Receiving pull-up simple RF

gistfile1.ino

byte leftSideData[5]={0};
uint8_t receivingIndex = 0;
boolean receiving = false;

const byte WAITING=0xE1,PULLUP=B10101010,PRE=0x5E,ADDR=0x10,NOTHING=0xFE,ERROR=0x77;
int receiveState = WAITING;

void loop(){
  byte in = receivePackage();
  if(in != NOTHING){
    Serial.print("package: ");
    Serial.println(in,HEX);
  }
}

uint8_t pullupCounter = 0;
static byte receivePackage(){
  byte erg = NOTHING;
  if(receiveState == WAITING && Serial434.available()){
    byte in = Serial434.read();
    if(in == PULLUP){ 
      receiveState = PULLUP;
      pullupCounter = 1;
    }
    else if(in == PRE){
      receiveState = PRE;
    }
  }
    
  if(receiveState == PULLUP && Serial434.available()){
    byte in = Serial434.read();
    if(in == PRE){
      receiveState = PRE; 
    }
    else if(in == PULLUP){
      pullupCounter ++;
      Serial.print("pullup: ");
      Serial.println(pullupCounter,DEC);
    }
    else if(in == ERROR){
      receiveState = WAITING;
    }
    
    if(pullupCounter > 13){
      pullupCounter = 0;
      receiveState = WAITING;
    }
  }
    
  if(receiveState == PRE && Serial434.available() > 2) {
    byte addr = Serial434.read();
    //Serial.print("addr: ");
    //Serial.println(addr);
    byte data = Serial434.read(); 
    //Serial.print("data: ");
    //Serial.println(data);
    byte chck = Serial434.read();
    //Serial.print("check: ");
    //Serial.println(chck);
    
    if(addr == ADDR && addr + data == chck){
      erg = data;
    }
    else{
      erg = ERROR;
    }
    receiveState = WAITING;
  }
  
  return erg;
}