connection over the internet using sock.lua

[PGUp]

I'm using sock.lua library networking.. https://github.com/camchenry/sock.lua
so from my knowledge, to achieve connection over the internet, the server needs it's public ip adress/localhost and the client need to connect over that ip adress...

this is the server code

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local sock = require 'sock'
function love.load()
    server = sock.newServer("localhost", 22122)
    server:on("connect", function(data, client)
        local msg = "Hello from the server!"
        client:send("hello", msg)
    end)
end

function love.update(dt)
    server:update()
end

and this is the client code

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function love.load()
    local serverPublicIp = "125.162.82.41"
    client = sock.newClient(serverPublicIp, 22122)
    client:on("connect", function(data)
        print("Client connected to the server.")
    end)
    client:connect()
end

function love.update(dt)
    client:update()
end

I tested both code on the same machine simultaneously, there is no error.. nothing.. the message was never transferred
and I tested to change the

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server = sock.newServer("localhost", 22122)

to

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server = sock.newServer("125.162.82.41", 22122)

it still wont work, I have no idea what went wrong, I need to know how to connect to other machine over the internet

[zorg]

The github page gives examples for the server, and that has this one line in it:

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server = sock.newServer("*", 22122)

Maybe try it like that?

[PGUp]

The github page gives examples for the server, and that has this one line in it:

Code: Select all

server = sock.newServer("*", 22122)

Maybe try it like that?

I gave it a try, the server and client never communicate, is it because I am on the same machine testing it though?

[ivan]

Check out my humble tutorial using just Lua socket:
https://2dengine.com/?p=networking

By setting its address to "*" the server will be able to communicate with multiple clients

Note that Lua socket won't work over the internet when one or both machines are behind a NAT device such as a home router.

[PGUp]

Check out my humble tutorial using just Lua socket:
https://2dengine.com/?p=networking

By setting its address to "*" the server will be able to communicate with multiple clients

Note that Lua socket won't work over the internet when one or both machines are behind a NAT device such as a home router.

I didnt know that.. so how does multiplayer games work? they connect over the internet, even when you are using a router.

I'm using sock.lua, it's a wrapper around enet. is it possible to connect over the internet using your router with enet though?

[ivan]

Routers perform network addresses translation (NAT) so that all of your devices at home can "share" one public IP on the internet.

so how does multiplayer games work?

It depends. For peer-to-peer connections using UDP you have to use a technique called "hole punching". From what I understand there are a few reliable libraries for "hole punching", but none of them in Lua.

[zorg]

You can implement a hole-punching algorithm in lua too (you'll need a publicly reachable server though), although in a few cases, that still doesn't guarantee success (Symmetric NAT-s, multi-level NAT without hairpin support) in which cases, comms could only go through a central/mediating server, as far as i know.