code: public DfuServiceInitiator setCustomUuidsForExperimentalButtonlessDfu(@Nullable final UUID buttonlessDfuServiceUuid,
  																		  @Nullable final UUID buttonlessDfuControlPointUuid) {
  		final ParcelUuid[] uuids = new ParcelUuid[2];
  		uuids[0] = buttonlessDfuServiceUuid      != null ? new ParcelUuid(buttonlessDfuServiceUuid)      : null;
  		uuids[1] = buttonlessDfuControlPointUuid != null ? new ParcelUuid(buttonlessDfuControlPointUuid) : null;
  		experimentalButtonlessDfuUuids = uuids;
  		return this;
  	}
docs: Sets custom UUIDs for the experimental Buttonless DFU Service from SDK 12.x. Use this method
  if your DFU implementation uses different UUID for at least one of the given UUIDs.
  Parameter set to <code>null</code> will reset the UUID to the default value.
  <p>
  Remember to call {@link #setUnsafeExperimentalButtonlessServiceInSecureDfuEnabled(boolean)}
  with parameter <code>true</code> if you intent to use this service.
  
  @param buttonlessDfuServiceUuid      custom Buttonless DFU service UUID or null, if default
  is to be used
  @param buttonlessDfuControlPointUuid custom Buttonless DFU characteristic UUID or null,
  if default is to be used
  @return the builder