function ping()

Test connection to specified IP or URL using ICMP packet

nil ping(config)

Parameters

table config{address, timeout, callback}

• string address IP or URL (without http://) to test
• optional number timeout maximal wait for response (in seconds)
• function{response} callback this function is called when response arrives or timeout is reached

Callback Parameters

table response{success, duration, errorInfo}

• boolean success false = timeout reached, true = response confirmed before timeout
• number duration response delay (in milliseconds); if not success, duration is nil
• string errorInfo error info in case of failure. If success, it contains "No error, return OK"

Return value

nil

Usage

-- callback function
local function logPingResult(o)
  if o.success then
    logf("Response lag: %dms", o.duration)
  else
    logf("Ping failed, reason: %s", o.errorInfo)
  end
end

-- test ping www.google.com
ping{address="www.google.com", timeout=10, callback=logPingResult}

-- test ping ip address
ping{address="77.75.79.39", callback=logPingResult}

-- test ping non-existent address
ping{address="Pandora", timeout=2, callback=logPingResult}