trackhelper.lua

local component = require("component")
local event = require("event")
local modem = component.modem
local redstone = component.redstone
local sides = require("sides")

channel_number = 1

modem.open(channel_number)

function check_cart()
    if redstone.getInput(sides.right) > 0 then
        return true
    else
        return false
    end
end

function send_cart()
    if check_cart() then
        redstone.setOutput(sides.left, 16)
        sleep(2)
        redstone.setOutput(sides.left, 0)
        return true
    else
        return false
    end
end


while true do
    localAddress, remoteAddress, port, distance, message = event.pull("modem_message")
    print("Request recieved")
    print("Request from: ", remoteAddress)
    if message == "send_cart" then
        result = send_cart()
        print("Cart available: ", result)
        modem.send(remoteAddress, 10, result)
        print("Response sent")
    end
end