pavlog

Let me add my situation (online cards game). We have the same situation at project start. But after brain storm we decided use multiple server instances (on one hardware box)...

Online card game, up to 6 players per table, dedicated server instance responsible for the: 1) Matchmaking for Connected players (sends to clients list of available rooms) 2) Game sessions...

This is standard iOS behavior - all sockets forcefully closed and destroyed by iOS after app goes to background. Your should handle "Background"/"Foreground" events in your app and implement destroy/reconnect....