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FIXsession: drop copy35=1
Probes whether the counterparty is still alive when nothing has arrived within the heartbeat interval. The counterparty must answer 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 a test request. A Heartbeat answering a Test Request must echo the value the request carried.
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required