Panasonic projector IP control

[admin]

Code:

function tcpsend(data, ip, port)
  local sock, res, err

  sock = require('socket').tcp()
  sock:settimeout(5)

  res, err = sock:connect(ip, port or 20554)
  
  if res then
    res, err = sock:receive(5)

    if res == 'PJ_OK' then
      sock:send('PJREQ')
      res, err = sock:receive(5)

      if res == 'PJACK' then
        sock:send(data)
        res, err = sock:receive(6)
      else
        alert('invalid/no ack: ' .. tostring(res))  
      end
    else
      alert('invalid/no init: ' .. tostring(res))  
    end
  else
    alert('connect failed: ' .. tostring(err))
  end

  sock:close()

  return res, err
end

cmdon = string.char(0x21, 0x89, 0x01, 0x52, 0x43, 0x37, 0x33, 0x30, 0x35, 0x0A)
cmdoff = string.char(0x21, 0x89, 0x01, 0x52, 0x43, 0x37, 0x33, 0x30, 0x36, 0x0A)

res, err = tcpsend(cmdon, '192.168.1.111')