Is my network application visible from the local network to the internet?

Question

Computer networks

I am connected to wifi, which is in the "corridor", that is, it is not mine, but I can tweak something there if necessary. And I have some network application running on a specific port on my computer. Can I connect to it (this application) (send a packet, get a response) via the Internet (from a cafe, for example)? Of course, I can find out the ip address that wifi in the corridor looks at the Internet.

If I can't, how can I do what I could?

Answer 1

You can, but only if your application's port is forwarded to your computer's local IP address.
Specific instructions vary by router model.

Answer 2

But to forward the port you need a static IP. Because the DHCP server can issue an IP to another computer and the port will be thrown on it. Therefore, you need to reserve an IP for a specific computer, which means that you will have to specify the MAC address of the network card. And only then forward the IP.
So instead I suggest using - UPnP