If you thing internal keepalives mechanism of AMF is not good enough for you, then AMF extension plugin (namely "amfPlugin.so") will provide an optional plugin which can be coordinate with HW based 'bus' or other protocols can learn of a failure to notify AMF Active/Standby's node status before AMF can handled via keepalives into internal mechanism (TIPC topology, UDP heartbeat).
Example of implementation located at <SAFPlus>/src/examples/notifications/amf/plugins.
To active the plugin, goto this folder and calling 'make', then copy the output (i.e amfPlugin.so) to <SAFplus>/lib on deployment target.