Insecure Sign Controller

local modem = peripheral.find "modem"

local function send_raw(text)
    modem.transmit(124, 124, text)
end

local function stupid_encode(text)
    local first_byte = string.byte(text, 1)
    local second_byte = string.byte(text, 2)
    local checksum = string.char(first_byte + 2, second_byte - 1)
    local to_send = checksum .. text
    return to_send
end

local function send(text)
    send_raw(stupid_encode(text))
end

local function randbytes(len)
    local out = ""
    for i = 1, len do
        out = out .. string.char(math.random(1, 253))
    end
    return out
end

local things = {"PotatOS", "YomatOS", "ChorOS", "ShutdownOS", "TomatOS", "BurritOS"}

while true do
    for _, t in pairs(things) do
        send(t)
        sleep(0.2)
    end
end