Love2D MP Server w/ colliders

--[[

    Server for the testgame

]]

local socket = require "socket"
local udp = socket.udp()
local OBJECT_WIDTH = 159
print(tostring(socket))
udp:settimeout(0)
udp:setsockname("*", 12345)
local world = {
    [1] = {
        type = "metal_block",
        x = 0,
        y = 0
    },
    [2] = {
        type = "metal_block",
        x = OBJECT_WIDTH,
        y = 0
    },
    [3] = {
        type = "metal_block",
        x = OBJECT_WIDTH*2,
        y = 0,
    },
    [4] = {
        type = "metal_block",
        x = OBJECT_WIDTH*2,
        y = OBJECT_WIDTH*3
    }
}
local data, msg_or_ip, port_or_nil
local entity, cmd, parms

local running = true
print("Beginning server loop.")
while running do
    data, msg_or_ip, port_or_nil = udp:receivefrom()
    if data then
        entity, cmd, parms = data:match("^(%S*) (%S*) (.*)")
        if cmd == "move" then
            local x, y = parms:match("^(%-?[%d.e]*) (%-?[%d.e]*)$")
            assert(x and y)
            x, y = tonumber(x), tonumber(y)
            local ent = world[entity] or {x=0, y=0}
            world[entity] = {x=ent.x+x, y=ent.y+y, type=ent.type}
        elseif cmd == "at" then
            local x, y, typ = parms:match("^(%-?[%d.e]*) (%-?[%d.e]*) (%S*)")
            print("parms: "..parms.." Typ: "..typ)
            assert(x and y and typ)
            x, y = tonumber(x), tonumber(y)
            world[entity] = {x=x, y=y, type=typ}
            world[entity].type = tostring(typ)
            print(tostring(entity).." "..tostring(world[entity].type))
        elseif cmd == "update" then
            for k, v in pairs(world) do
                print("ITEM: "..tostring(k).." "..tostring(v.type))
                udp:sendto(string.format("%s %s %d %d %s", k, 'at', v.x, v.y, v.type), msg_or_ip,  port_or_nil)
            end
        elseif cmd == "quit" then
            running = false
        else
            print("Unrecognized command: ", cmd)
        end
    elseif msg_or_ip ~= "timeout" then
        error("Unknown network error: "..tostring(msg))
    end

    socket.sleep(0.001)
end
print("Thank you.")