Connect to volumio by 4g modem

At first, hello and thank you for the great product!

I need to connect to volumio by 4g modem, pluged into raspberry, over web.
I think i’ll do it it by NOIP, and found this solution … e_LAN.html

Is it right syntax?
return res.json({ host: ‘http://’+‘’});

That’s enough or necessary to install Dynamic Update Client? … te-client/

Thanks in advance!