Most of the time the Central send an email to admins when the connection is lost....but not always.
What you can do is to make monitors to check (through the UI, web services or even a query on db) if the ES is connected to the central or not. Then with the action essential (IIWS) you can send alerts to BPPM.
hope it helps
I realize this is not exactly what you asked, but it is related.
How to detect that the TM ART database is not getting updated, has not been updated in the last 3 minutes
See below for a sample of SQL code:
select count(distinct transid_fk)
where logtime >= (current_date) - INTERVAL '3' MINUTE
and logtime <= current_date