In OSCP, some hello packets are generated periodically
while others are triggered by events. Specifically,
event-triggered hellos are sent upon every state change
(except 'oneWay' to 'twoWay') and when a change occurs in
the bundle identifier. To avoid potential system
misbehavior in which hello packets would be triggered in
an uncontrolled fashion, a hello hold down timer is
introduced that prevents successive event-triggered hellos
from being sent in too short a time interval.
This object contains the minimum time between (triggered)
hellos.
This value must be smaller than 75% of the value of
coscpHelloInterval.