3.1.4 Higher-Layer Triggered Events

To send a frame, data MUST be framed according to the rules specified in [RFC6455] section 5. If the value of the set-mask-to-zero ADM element is false, the behavior is unchanged from that specified in [RFC6455] section 5.3. If the value of set-mask-to-zero is true, then the Masking-key field (as defined in [RFC6455] section 4.2) MUST be set to zero instead of being derived from a strong source of entropy.