3.3.5.3.20 Sending Control PDU - Cooperate
The structure and fields of the Control (Cooperate) PDU are described in section 2.2.1.20, and the techniques described in section 3.3.5.1 demonstrate how to initialize the contents of the PDU. The grantId and controlId fields SHOULD be set to zero. The contents of this PDU SHOULD NOT be compressed.