#if !defined(DEBUG_FLAG)
  #define DEBUG_FLAG false
#endif

#include <SPI.h>
#include <Ethernet2.h>
#if DEBUG_FLAG
  #include <HardwareSerial.h>
#endif

class NetClass {
  private:
    #if DEBUG_FLAG
      HardwareSerial* _debug;
    #endif
    EthernetClass* e;
    void init(void);
    // Mac-Adress of the Ethernet-Shield
    uint8_t mac[6] = { 0x90, 0xA2, 0xDA, 0x10, 0x4F, 0xA4 };
  public:
    #if DEBUG_FLAG
      NetClass(HardwareSerial *debug);
    #else
      NetClass(void);
    #endif
};

#if DEBUG_FLAG
  NetClass::NetClass(HardwareSerial *debug) {
    this->_debug = debug;
    this->init();
  }
#else
  NetClass::NetClass(void) {
     this->init();
  }
#endif

void NetClass::init(void) {
  pinMode(10, OUTPUT);
  digitalWrite(10, HIGH);
  #if DEBUG_FLAG
    this->_debug->println("Start Network!");
    this->_debug->println("DHCP Request");
  #endif
  this->e = &Ethernet;
  if (this->e->begin(mac) == 0) {
    #if DEBUG_FLAG
      this->_debug->println("DHCP Failed, Use Link-Local Adress");
    #endif
    this->e->begin(mac, IPAddress(169, 254, 1, 177), IPAddress(169, 254, 0, 1), IPAddress(255, 255, 0, 0));
  }
  #if DEBUG_FLAG
    this->_debug->print("Ethernet Started! IP: ");
    IPAddress ip = Ethernet.localIP();
    for (byte thisByte = 0; thisByte < 4; thisByte++) {
      // print the value of each byte of the IP address:
      this->_debug->print(ip[thisByte], DEC);
      this->_debug->print(".");
    }
    this->_debug->println();
   #endif
}