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JamJar uses the jamjar-relay-server protocol to handle networking, allowing use of a central relay server to allow client hosted games. This protocol defines a number of messages and actions that can be done (e.g. connecting, listing clients, migrating hosts) while also providing a mechanism to relay messages to other clients. This allows for client-hosted servers, with one client acting as a host and deciding how the game logic is processed.

The networking that JamJar supports is v1 of the relay server protocol, there is a [WebSocketNetworkSystem] that is provided with JamJar which implements the protocol, converting messages and actions from the protocol into JamJar messages, while also providing the ability to relay JamJar messages to other clients. The [WebSocketNetworkSystem] uses a tick rate for outbound messages, meaning that outbound messages are stored in a queue and then published together on every tick. The inbound messages are also stored in a list, but are propogated to the rest of the game engine on every game update.