Resident script - IP watchdog

[admin]

You can use socketping function but with port set to 502 (default ModBus TCP port):

Code:

function socketping(ip, port, timeout)
  port = port or 80
  local sock = require('socket').tcp()
  sock:settimeout(timeout or 2)
  local res, err = sock:connect(ip, port)
  sock:close()
  
  return res, err
end

ip = '192.168.10.150'
if not socketping(ip, 502) then
  alert('device is offline')
end