Type: int
Heartbeat interval (seconds)
Added in protocol FIX.3.0
See in: FIX.4.0, FIX.4.1, FIX.4.2, FIX.4.3, FIX.4.4, FIX.5.0, FIX.5.0SP1, FIX.5.0SP2, FIXT.1.1.
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