Client Mag Card Reader

shell.run("clear")
ServerID = 0 --[[ The unique computer ID of the server for the verifivation of the magnetics cards,
                    change it if this is not your ID for your server. The client is going to try to authenticate the server,
                    if it ends by an error (like it can't reach the server or the ID is not the same of the server, NOTHING GOING TO HAPPEN,
                    even if the password on the card is correct.  ]]--
function getPeripherals()
    local sides= {"left","right","back","front","bottom","top"}
    for i=1,#sides do
        if peripheral.isPresent( sides[i] ) then
            if peripheral.getType( sides[i])  == "mag card reader" then
                magside = sides[i]
                mag = peripheral.wrap(magside)
            elseif peripheral.getType( sides[i])  == "monitor" then
                monside = sides[i]
                mon = peripheral.wrap(monside)
            elseif peripheral.getType( sides[i])  == "modem" then
                rednet.open(sides[i])
            end
        end
    end
end
getPeripherals()
function pass()
    while true do
        repeat
            event, data = os.pullEvent()
        until event == "mag_swipe"
        if event == "mag_swipe" then
            rednet.send(0, data)
            senderID, msg, dist = rednet.receive(10)
            if msg == nil or msg == "Error" then
                print("Error")
            elseif senderID == ServerID and msg == "ok" then
                rs.setOutput("bottom", true)
                sleep(1.5)
                rs.setOutput("bottom", false)
            end
        end
    end
end
pass()