@Override
    @Nullable
    public PacketDeliverer getPacketDeliverer() {
        return backupDeliverer;
    }
Sets the number of milliseconds a connection has to be idle to be closed. Sending
stanzas to the client is not considered as activity. We are only considering the
connection active when the client sends some data or hearbeats (i.e. whitespaces)
to the server.

@param timeout the number of milliseconds a connection has to be idle to be closed.
xmppserver/src/main/java/org/jivesoftware/openfire/net/SocketConnection.java