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The Sequence message is used in both Recoverable (CME to customer) and Idempotent (customer to CME) flows.

35=Sequence

TagNameBinary TypeBinary LengthReqEnumerationDescription
39001UUIDuInt648Y

Matches Establish.UUID used to establish the connection.

39013NextSeqNouInt324Y

Next expected message sequence number.

On the primary connection, the next expected message sequence number represents the sequence number of the next business message to be sent from the customer to CME or from CME to the customer.

On the backup connection, this will be set to 0.

Upon failover, the newly elected primary will send a Sequence message with NextSeqNo=the last message sequence number used by the primary + 1.

39010FaultToleranceIndicatorFTI1N

0=Backup

1=Primary

Indicates whether the connection is the primary or backup.

Upon failover, the newly elected primary will send a Sequence message with Status=1.

Not required to be sent from customer to CME.

39016

KeepAliveIntervalLapsed

KeepAliveLapsed

1Y

0=Not Lapsed

1=Lapsed

Indicates whether one Keep Alive interval has lapsed without any message received.

If an additional KeepAliveInterval lapses with no message received, then the socket connection will be disconnected.