returns whether or not this message might be a duplicate of one which has already been received . this will only be set on messages received from the server . concode_field_sep boolean retained concode_elem_sep boolean dup concode_elem_sep byte[] payload concode_elem_sep int qos concode_elem_sep boolean mutable concode_field_sep void validateQos concode_elem_sep byte[] getPayload concode_elem_sep void clearPayload concode_elem_sep void setQos concode_elem_sep boolean isRetained concode_elem_sep void setPayload concode_elem_sep int getQos concode_elem_sep void setDuplicate concode_elem_sep void setMutable concode_elem_sep String toString concode_elem_sep void setRetained concode_elem_sep void checkMutable
boolean function ( ) { return this . dup ; }