ReadonlyappThe application the connection belongs to.
ReadonlyclosedAborts when the connection disconnects. Drop per-client state here.
ReadonlymoduleThe federation module id of the connection. Equals appId when the host supplied none.
Writes a state value to this connection only. Ignored once the connection has closed.
The host's handle to one connection: who it is, when it closes, and where to write its state.