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Once the Client has successfully established a session with the Whisperer Feed Handler (i.e. on dispatch of the first Heartbeat message in response to the end of synchronisation TestRequest), subsequent Heartbeat messages are sent by each party as follows:

• The HeartBtInt value is specified by the Client in their Logon message and subsequently used by both sides of the Client Session, i.e. the FH will always use the interval specified by the Client.
• The heartbeat interval timer should be reset after every message is transmitted (not just heartbeats).
• On expiry of the heartbeat interval timer, a Heartbeat message must be sent.

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Test Request

TestRequest messages may be issued by either party and under normal circumstances result in a Heartbeat being sent in response, echoing the specified TestRequestID.

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