3.1.5.9.7 Updating an ODATA Packet
The server MUST update the following fields of the ODATA packet (section 2.2.16) before sending the packet to the multicast address (section 3.1.1.1):
ClientId: MUST be set to MasterClientId (section 3.1.1.3).
TrailODATASeqNo: MUST be set to the ODATASeqNo of the ODATA packet stored at the head of the Data Packet List (section 3.1.1.3).