Wireless Bill Check

local args = {...}
rednet.open('top')
if not args[1] then
    error('Input a bill UUID!')
end

local uuid = args[1]

local dataSend={}

for len = 1,#uuid do
    local char = string.byte(string.sub(uuid,len,len))*3
    table.insert(dataSend,char)
end

rednet.send(9,dataSend)
local waitCount=0
local isValid=nil
repeat
    local id,data = rednet.receive(3)
    if id==9 then
        isValid=data
    end
until waitCount > 10 or isValid~=nil

if waitCount>10 then
    error('Connection Timed Out!')
end

if tonumber(isValid) > 0 then
    term.setTextColor(colors.green)
    print('Bill is currently valid!')
    term.setTextColor(colors.cyan)
    print('Value: '..isValid)
    print('')
    sleep(2)
    term.setTextColor(colors.orange)
    print('Press any key to continue . . .')
    os.pullEvent('key_up')
    term.clear()
else
    term.setTextColor(colors.red)
    print('Invalid bill!')
end