3.3.5.3.15 Processing Control PDU - Cooperate
The structure and fields of the Control (Cooperate) PDU are described in section 2.2.1.15, and the techniques described in section 3.3.5.2 demonstrate how to process the contents of the PDU. The contents of the controlId and grantId fields MUST be ignored.
After successfully processing the client-to-server Control (Cooperate) PDU, the server MUST send the Control (Cooperate) PDU (section 3.3.5.3.20) to the client. If processing of the client-to-server Control (Cooperate) PDU was unsuccessful, the connection SHOULD be dropped.