Arduino servo control via serial(pc)

#define verPin 3
#define horPin 5

#include <string.h>
#include <Servo.h>

unsigned minHorDegree = 45;
unsigned maxHorDegree = 135;

unsigned minVerDegree = 45;
unsigned maxVerDegree = 135;

Servo srvHor;
Servo srvVer;

unsigned pos;

char message[20] = "";
unsigned index = 0;

char aux[4] = "";

int horValue = (maxHorDegree-minHorDegree)/2;
int verValue = (maxVerDegree-minVerDegree)/2;

int curHorValue = horValue;
int curVerValue = verValue;

int horMaxStep = 5;
int verMaxStep = 5;

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

  srvHor.attach(horPin);
  srvVer.attach(verPin);
  Serial.println("servos attached");
}

void loop(){
  if(Serial.available() > 0){
    message[index] = Serial.read();
    if(message[index] != '\n'){
      Serial.print(message[index]);
      Serial.println(" is not null");
      index++;
    }else{
      Serial.println("Got enter. EOM");
      message[index] = '\0';
      index = 0;
      unsigned len = strlen(message);

      if(message[1] != ':'){
        Serial.print("error(");
        Serial.print(len);
        Serial.println(")");
      }else{
        Serial.print("ack(");
        Serial.print(len);
        Serial.println(")");


        if(message[0] == 'a'){ //a:...
          //ignore
        }else if(message[0] == 's'){ //s:XXX:XXX
          aux[0] = message[2];
          aux[1] = message[3];
          aux[2] = message[4];
          aux[3] = '\0';
          horValue = atoi(aux);
          if(horValue > maxHorDegree){
            horValue = maxHorDegree;
          }else if(horValue < minHorDegree){
             horValue = minHorDegree;
          }

          aux[6] = message[4];
          aux[7] = message[5];
          aux[8] = message[6];
          aux[3] = '\0';
          verValue = atoi(aux);

          if(verValue > maxVerDegree){
            verValue = maxVerDegree;
          }else if(horValue < minHorDegree){
             verValue = minVerDegree;
          }

          Serial.print(horValue);
          Serial.print(":");
          Serial.print(verValue);
          Serial.println(".");
        }else{
          Serial.println("unknown");
        }
      }
    }
  }

  if(curVerValue != verValue){
    int diff = verValue-curVerValue;
    Serial.print("verDiff should be: ");
    Serial.println(diff);
    if(diff > 0 && diff > verMaxStep){
      Serial.println("diff set to 5");
      diff = 5;
    }

    if(diff < 0 && diff < verMaxStep){
      Serial.println("diff set to -5");
      diff = -5;
    }
    curVerValue += diff;

    srvVer.write(curVerValue);
    Serial.print("ver: from ");
    Serial.print(curVerValue-diff);
    Serial.print(" to ");
    Serial.print(curVerValue);
    Serial.print(" until ");
    Serial.println(verValue);
  }

  if(0){//if(curHorValue != horValue){
    int diff = horValue - curHorValue;
    if(diff > horMaxStep){
      diff = horMaxStep;
    }
    if(diff < (-1)*horMaxStep){
      diff = (-1)*horMaxStep;
    }
    curHorValue += diff;

    srvHor.write(curHorValue);
    Serial.print("hor:set to ");
    Serial.println(curHorValue);
  }
}