Echo message (Request/Response) Monitor

Environment

OS = Linux 6x/7x

SFHA = Suppose latest i.e 6x

Query:

We have a two nodes local HA. A customized application running on it(HA) fine. The customized application send a tcp echo response (800) on the tcp echo request of (810) from a machine exist on LAN. I want to monitor this echo cycle under HA.