module packets; // client request struct LoginPacket { string userName; } // server response struct SessionInfoPacket { size_t yourId; string[size_t] userNames; } struct UserLoggedInPacket { size_t userId; string userName; } struct UserLoggedOutPacket { size_t userId; } // sent from client with peer == 0 and from server with userId of sender. struct MessagePacket { size_t userId; // from. Set to 0 when sending from client string msg; }