Missing acknowledge random factor for RFC 7252

[jtaySWE]

Hello for configuration options is there acknowledge random factor being used for retransmission

according to https://www.rfc-editor.org/rfc/rfc7252.html#section-4.8

// TransmissionOpt transmission options.
type TransmissionOpt struct {
	transmissionNStart             uint32
	transmissionAcknowledgeTimeout time.Duration
	transmissionMaxRetransmit      uint32
}

I can't find anywhere if it is being used. Is it possible to include it in configuration options?

func (m *midElement) Retransmit(now time.Time, acknowledgeTimeout time.Duration) bool {
	if now.After(m.start.Add(acknowledgeTimeout * time.Duration(m.retransmit.Load()+1))) {
		m.retransmit.Inc()
		// retransmit
		return true
	}
	// wait for next retransmit
	return false
}