xmpp.go
func NewClient(host, user, passwd string, debug bool) (*Client, error) {
	opts := Options{
		Host:     host,
		User:     user,
		Password: passwd,
		Debug:    debug,
		Session:  false,
	}
	return opts.NewClient()
}
func NewClient(host, user, passwd string, debug bool) (*Client, error) {
	opts := Options{
		Host:     host,
		User:     user,
		Password: passwd,
		Debug:    debug,
		Session:  false,
	}
	return opts.NewClient()
}
// NewClient creates a new connection to a host given as "hostname" or "hostname:port".
// If host is not specified, the  DNS SRV should be used to find the host from the domainpart of the JID.
// Default the port to 5222.