Subscribers initiate all connections. OpenYield accepts connections only during agreed hours and from secure endpoints.
Sessions must send heartbeats every 30 seconds (default).
Sessions disconnect if two consecutive heartbeats are missed and a test request (35=1) fails.
Market Data and Order Book sessions reset sequence numbers on every reconnect; prior session messages are lost and a new snapshot is sent. Sequence resets on other session types are not supported and require manual intervention.