Test Request(1) Message
Used to request a heartbeat
From QST FIX server to FIX client and from FIX client to QST FIX server
A Test Request (1) message is used to force the counterparty to respond with a Heartbeat (0) message to validate the state of the connection between a FIX client and QST FIX server.
When either party stops receiving data for the specified heartbeat interval, it should send a Test Request (1) message. The counterparty should send a Heartbeat (0) message in response. If a party does not receive a Heartbeat (0) message in a reasonable amount of time, the connection should be considered lost.