void getZeitronicPacket(char* packetpointer){
gotPacket = 0;
char buffer[18] = {0xF};
  for (int i=2; i<18; i++){
    Serial1.readBytes(&buffer[i - 2],1);
    if (buffer[i] == 2 && buffer[i-1] == 1 && buffer[i-2] == 0) {
          gotPacket = 1;
          Serial1.readBytes(packetpointer,11);
          return;
        }
    if (i == 17) { i = 0;} // repeat the 3-byte check on the next 3 bytes..
       }
}