code: public boolean setKDR(int keyDefinitionRate) {
  		boolean res = true;
  		if ((keyDefinitionRate > 64) || (keyDefinitionRate <= 0)) {
  			log("setKDR() - invalid parameter " + keyDefinitionRate);
  			res = false;
  		} else {
  			kdr = keyDefinitionRate;
  		}
  		return res;
  	}
docs: Set KDR (Key Definition Rate)
  
  @param keyDefinitionRate
  New key definition rate is 2^aKDR, and maximum is 64 (2^64)
  @return true if successfully set, false for invalid KDR values