MP_Manager

Handling asynchronous multiplayer handshakes in Unreal Engine requires strict state management to avoid race conditions, ghost players, and session desynchronization. MP_Manager was engineered to abstract the complexities of the Online Subsystem (OSS) while maintaining absolute server authority over the lobby lifecycle.

The core architecture revolves around an interface-driven wrapper that standardizes calls to diverse backend providers like Steam, Epic Online Services (EOS), and EIK. This decoupling allows developers to hot-swap their matchmaking backend without altering the underlying game mode logic. The session state machine is tied directly to the GameMode and PlayerController lifecycles, guaranteeing that operations such as creating, joining, and destroying sessions are handled sequentially and validated by the server.

A significant architectural focus was placed on decoupling the heavy backend networking logic from the user interface flow. By utilizing a component-based data structure and event-driven multicast delegates, the framework broadcasts real-time player metadata updates (such as selected characters or ready states) directly to connected clients. This ensures the visual lobby state remains perfectly synchronized with the server's authoritative memory, minimizing network lag and preventing desync events during level transitions.