Output - Heartbeat

Unsolicited message sent from the server on a periodic basis.

Fields

Ref	Field	Name	Data Type	Values	Usage	Description
1	`header`
2	`→ messageType`	Message Type	`string`	`HEARTBEAT` (Heartbeat)	ALWAYS	Denotes trade summary message.
3	`→ sentTime`	Sent Timestamp	`timestamp`		ALWAYS	CME MDP gateway sends the message (UTC).
4	`→ sequenceNumber`	sequenceNumber	`string`		ALWAYS
5	`→ version`	API Version	`string`	`1.0` (1.0)	ALWAYS