How to connect the site and the RPI device?

Question

API

Good afternoon, in general, you need to figure out how to connect the site and the device on which the local server is running via node.js

What you need:
1. So that the device server (node.js) can receive sockets and send to the site (Raspberry Pi 3 device)
2. So that it was without additional. actions such as: open a port in the modem, etc.
3. The site could send data to this device (sockets) to turn it off, let's say

How can I implement it?

Answer 1

Websockets. Malina is just another client.