code: short getStructLength()
  	{
  		int len = device.getStructLength() + suppfam.getStructLength();
  		if (mfr != null)
  			len += mfr.getStructLength();
  		return (short) len;
  	}
docs: /* (non-Javadoc)
  @see tuwien.auto.calimero.knxnetip.servicetype.ServiceType#getStructLength()