Customers can send the Retransmit Request message to recover missed messages.
35=RetransmitRequest
| Tag | Name | Binary Type | Binary Length | Req | Enumeration | Description |
|---|---|---|---|---|---|---|
| 39001 | UUID | uInt64 | 8 | Y | Matches Establish.UUID. | |
| 39017 | LastUUID | uInt64NULL | 8 | N | If the Retransmit Request is for a previous UUID, then put that here otherwise put default null value. 0 – Default CME assigned UUID for any messages to be sent to customer before first customer Establish of the week. Or UUID from any previous Establish in the current week (Sunday-Friday) Max value is 9223372036854775807 | |
| 39002 | RequestTimestamp | uInt64 | 8 | Y | Time of request. CME Group recommends using the number of nanoseconds since epoch (Jan 1, 1970) as the timestamp. | |
| 39018 | FromSeqNo | uInt32 | 4 | Y | Sequence number of the first business message requested. Tag 39018 will not be zero, but it contains the starting sequence number either for current UUID, previous UUID or the default UUID of 0. | |
| 39019 | MsgCount | uInt16 | 2 | Y | Number of business messages requested. Cannot exceed 2500 at a time or the message will be rejected. 0 – Up to 2500 messages subsequent to FromSeqNo, when available. If the missing messages exceed 2500, it will be capped such that the request does not exceed total of 2500. |