docs: public void setDefaultPBKey(PBKey defaultPBKey)
      {
          if(this.defaultPBKey != null)
          {
              log.warn("The used default PBKey change. Current key is " + this.defaultPBKey + ", new key will be " + defaultPBKey);
          }
          this.defaultPBKey = defaultPBKey;
          log.info("Set default PBKey for convenience broker creation: " + defaultPBKey);
      }