LÖVE

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--single connection
love.client.Init()
love.client.socket:setoption("broadcast", true)
--multiple connections
conn = love.client()
conn.socket:setoption("broadcast", true)

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love.filesystem.require("LUBE.lua") --load the file, obviously

function rcvCallback(data)
    --data is the data received, do anything you want with it
end

function load()
    --do anything else you need to do here
    lube.client.Init() --initialize
    lube.client.setHandshake("Hi!") --this is a unique string that will be sent when connecting and disconnecting
    lube.client.setCallback(rcvCallback) --set rcvCallback as the callback for received messages
    lube.client.connect(ip, port) --change ip and port into.. an ip and a port
end

function update(dt)
    lube.client.update() --usually you call this before anything else, so you always work with updated variables
    --anything else
end

function draw()
    --nothing special here
end

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love.filesystem.require("LUBE.lua")

function connCallback(ip, port) --when a client connects
    --do something
end

function rcvCallback(data, ip, port) --same as in client, but also receives ip and port of sender
end

function disconnCallback(ip, port) --when a client disconnects
end

function load()
    --anything
    lube.server.Init(port) --again, change port
    lube.server.setCallback(rcvCallback, connCallback, disconnCallback) --set the callbacks
    lube.server.setHandshake("Hi!") --should be the same as the client
end

function update(dt)
    lube.server.update() --same story as client
end

function draw()
end

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LUBE.lua:303: attempt to index local 'self' (a number value)

Stack traceback:
LUBE.lua:303: in function 'Init'
main.lua:20: in function <main.lua:18>