TODO

1.  user sends initiates a transaction after either sending/ receiving a logout. 

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

Under normal circumstances, TestRequest messages may therefore be used to obtain an approximate indication of message round-trip times between the MFAPI Client and the Whisperer Feed Handler.

Session Termination

If no Heartbeat response is received within HeartBtInt + MaxTx seconds of the issuance of the TestRequest, then the party should abort the session with a Logout message.

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