code: public void setContactFilter(short categoryBits, short groupIndex,
  			short maskBits) {
  		filterA = new Filter();
  		filterA.categoryBits = categoryBits;
  		filterA.groupIndex = groupIndex;
  		filterA.maskBits = maskBits;
  	}
docs: Creates new contact filter for this light with given parameters
  
  @param categoryBits - see {@link Filter#categoryBits}
  @param groupIndex   - see {@link Filter#groupIndex}
  @param maskBits     - see {@link Filter#maskBits}