nl_tokens: Retrieve the Application Specific Feedback ( if present ) from the Status Message .
pl_tokens: public int applicationSpecificFeedback ( final byte [ ] destination ) { final int frameLength = frameLength ( ) ; int result = 0 ; if ( frameLength > HEADER_LENGTH ) { if ( frameLength > capacity ( ) ) { throw new AeronException ( String . format ( "SM application specific feedback (%d) is truncated (%d)" , frameLength - HEADER_LENGTH , capacity ( ) - HEADER_LENGTH ) ) ; } final int copyLength = Math . <mask> ( destination . length , frameLength - HEADER_LENGTH ) ; getBytes ( APP_SPECIFIC_FEEDBACK_FIELD_OFFSET , destination , 0 , copyLength ) ; result = copyLength ; } return result ; }