MDP 3.0 - Admin Heartbeat

Admin Heartbeat (tag 35-MsgType=0) message is sent on UDP Real-Time Feed and Recovery Feeds in periods of no activity at a configurable time interval and consists of only a standard technical header and a FIX message header.  Currently, the configurable time interval is 30 seconds. This message maps to the AdminHeartbeat12 template in the SBE MDP Core Message schema.