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FIXsession: admin35=1
Sent when nothing has arrived within the heartbeat interval and the session’s liveness is in doubt. The counterparty must respond with a Heartbeat echoing TestReqID, which is how the probe is matched to its answer. Direction: Either direction
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required
35=1
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string
required
Token identifying the test request. A heartbeat answering a test request must echo the value it carried.
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required