ShopIronGold Trade with shards

os.loadAPI("ocs/apis/sensor")
sen = sensor.wrap("top")
rednet.open("front")

while true do
    s = sen.getTargets()
    function getS()
        for v, k  in pairs(s) do
            if k.Name == "ME Wireless Access Point" then
                target = v
            end
        end
        return target
    end

    f = getS()
    s1 = sen.getTargetDetails(target)
    for v, k in pairs(s1.Items) do
        if k.Name == "Shard of Minium" then
            number = k.Size
            print(number)
            if number >= 1 then                         --wenn mehr als 1 Shard erkannt
                rs.setOutput("left", true)
                sleep(1)
                rs.setOutput("bottom", true)
                sleep(1)
                rs.setOutput("bottom", false)
                rednet.send(16275,number)               --send number to turtle
                x, y, z = rednet.receive()              --Warte auf Signal zum reboot
                if y == 0 then
                    rs.setOutput("left", false)
                    os.reboot()
                end
            end
        end
    end
end