computercraft/register_lns.lua

io.write("Enter the hostname: ")
hostname = io.read()

io.write("Enter the modem location: ")
modem_location = io.read()

io.write("Use default LNS Server? (y/n): ")
use_default = io.read()

lns_server = "default"
if use_default == "n" then
    io.write("Enter the LNS Server Rednet Hostname: ")
    lns_server = io.read()
end

rednet.open(modem_location)
receiverID = rednet.lookup("lns", lns_server)
current_time = os.time()


data = {
    ["action"] = "register",
    ["hostname"] = hostname
}

rednet.send(receiverID, data)

while true do
    id, msg = rednet.receive()
    if id == receiverID then
        if msg == "ok" then
            print("Registered with LNS Server Successfully!")
            break
        else
            print("Failed to register with LNS Server! Error: " .. msg)
            break
        end

        -- timeout after 5 seconds
        if os.time() - current_time > 5 then
            print("Failed to register with LNS Server! Timeout!")
            break
        end
    end
end