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FIXsession: admin35=0
Sent when no other traffic has passed within the negotiated heartbeat interval, so that both sides can tell a quiet session from a dead one. When it answers a Test Request it must echo that request’s TestReqID. The interval is negotiated through HeartBtInt (108) on Logon. Direction: Either direction
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required
35=0
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string
Token identifying the test request. A heartbeat answering a test request must echo the value it carried.Required: Conditional
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required