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')