xmpp.go
func (c *Client) Close() error {
	if c.conn != (*tls.Conn)(nil) {
		return c.conn.Close()
	}
	return nil
}
func (c *Client) Close() error {
	if c.conn != (*tls.Conn)(nil) {
		return c.conn.Close()
	}
	return nil
}
// Close closes the XMPP connection