Lua

Send an FTP NOOP (Keep-Alive)

Demonstrates the Chilkat Ftp2.Noop method, which sends the FTP NOOP command. It takes no arguments and succeeds only when the server returns a positive reply.

Background: NOOP asks the server to do nothing and simply reply, which makes it the standard keep-alive: sending one periodically resets the server's idle timer so a long-running job does not lose its control connection between transfers. Because it exercises a real request/reply round trip, a successful NOOP is also firmer evidence the connection is alive than CheckConnection.

Chilkat Lua Downloads

Download Chilkat for Lua

Lua

local chilkat = require("chilkat")

-- Demonstrates the Ftp2.Noop method, which sends the FTP NOOP command.  It takes no arguments.
-- The server must return a positive reply for the method to succeed.

local ftp = chilkat.Ftp2.new()

ftp.hostname = "ftp.example.com"
ftp.username = "myFtpLogin"

-- Normally you would not hard-code the password in source.  You should instead obtain it
-- from an interactive prompt, environment variable, or a secrets vault.
ftp.password = "myPassword"

-- Connect and log in (Connect performs both).
local success = ftp:connect()
if not success then
    print(ftp.last_error_text)
    return
end

-- NOOP does nothing on the server, but a successful reply confirms the control connection is
-- still responsive -- useful as a keep-alive during an otherwise idle session.
success = ftp:noop()
if not success then
    print(ftp.last_error_text)
    return
end

print("NOOP acknowledged by the server.")

success = ftp:disconnect()
if not success then
    print(ftp.last_error_text)
    return
end