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TIBCO BusinessWorks fault-tolerance internally relies on Rendezvous fault-tolerance (RVFT). The RVFT heartbeat messages use the transport passed to the tibrvftMember_Create(). Users have no way to make the heartbeart message use PTP/unicast message. RVFT heartbeat messages are broadcast/multicast messages and are not eligible for direct communication.

A message is eligible for direct communication if it meets the following four conditions:

The message has an inbox destination subject.
Its sending transport object is eligible and enabled.
Its receiving transport object is eligible and enabled.
The network path between the sender and the receiver does not cross through Rendezvous routing daemon (rvrd).

Since RVFT heartbeat messages are not PTP messages, heartbeat message are not eligible for direct communication. As a result, you cannot use unicast/P2P/direct communication for FT heartbeats in BusinessWorks.