@Override
    public Duration getMaxIdleTime() {
        return ConnectionSettings.Multiplex.IDLE_TIMEOUT_PROPERTY.getValue();
    }
Enable / disable backup delivery of stanzas to other connections in the same connection manager when a stanza
failed to be delivered on a multiplexer (connection manager) connection. When disabled, stanzas that can not
be delivered on the connection are discarded.
xmppserver/src/main/java/org/jivesoftware/openfire/nio/NettyMultiplexerConnectionHandler.java