State Controller

--State Controller
--Consts--
local floorChanger = 7
local door1 = 8
local door2 = 10
peripheral.find("modem", rednet.open)

local floor = 0
local running = false

string.startswith = function(self, str)
    return self:find('^' .. str) ~= nil
end

while true do
    local id, message = rednet.receive()

    if message == "elevatorRunning" then
        running = not running
    elseif message:startswith("changeFloor") then
        local requestedFloor0 = string.sub(message, 12, 13) == "0"
        if not running and ((requestedFloor0 and floor == 1) or (not requestedFloor0 and floor == 0)) then
            if floor == 0 then
                floor = 1
                rednet.send(door1, "closeDoor0")
                rednet.send(door2, "closeDoor0")
            else
                floor = 0
                rednet.send(door1, "closeDoor1")
                rednet.send(door2, "closeDoor1")
            end
            rednet.send(floorChanger, "flip")
        end
    end
end