Arcam control over ip

[Thinklight]

Hi,
What I am doing wrong?
I want to control Arcam receiver over IP and put in Command function this code:

Code:

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

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

 res, err = sock:connect(ip, port or 50000)
 
 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

Then from event script using this:

Code:

cmdon  = string.char(0x21, 0x01, 0x00, 0x01, 0xF0, 0x0D)
cmdoff = string.char(0x21, 0x01, 0x00, 0x00, 0xF0, 0x0D)
ip = '192.168.11.112'

if (event.getvalue()==true) then
 res, err = tcp_arcam(cmdon, ip)
else
 res, err = tcp_arcam(cmdoff, ip)
os.sleep(2.5)
 res, err = tcp_arcam(cmdoff, ip)
end
log (res, err)

Manual of receiver is her: Manual of control