Integration with Satel alarm system via ETHM-1

[buuuudzik]

I have a script for a read the states of inputs. But I have a little problem in my resident script. I cannot use grp.write() or grp.update() because I have this error:

Code:

Line 0: attempt to call field 'rshift' (a nil value)

I've tried send the same in the other script and there was ok.

This is my script:

Code:

-- Integracja z systemem Satelem po TCP
cmd = string.char(0xFE,0xFE,0x00,0xD7,0xE2,0xFE,0x0D)
bytes = 23

-- function Satel(cmd, bytes)
function satel_send(cmd, bytes)
ethm_ip = '192.168.2.9'
port = 7094

socket = require('socket')
client=socket.tcp()
success, error = client:connect(ethm_ip, port)

if success == 1 and error == nil then
client:settimeout(0.3)
client:send(cmd)
data, error, partial = client:receive(bytes)

-- error
if not data then
data = partial
end

client:close()    

end
 
return data
end  


-- Funkcja odpowiedzialna za wyciągniecie poszczególnych bitów i wstawienie ich do tabeli
function convert(data)
 local res, byte

 res = {}
 for i = 1, #data do
   -- get single byte
   byte = data:byte(i, i)
   byte = string.char(byte)
   bits = hex2bin(byte)
   for b = 1, #bits do
   -- get single bit
   bit = bits:byte(b, b)
   bit = string.char(bit)
   if bit == '0' then
     bin = false
   elseif bit =='1' then
     bin = true
   end
   -- add to result
   res[i*4-(4-b)] = bin
   end
 end
 return res
end


data = satel_send(cmd, bytes)
-- check if some data is available
if data then
data = lmcore.strtohex(data, true)
-- delete first 4 and last 8 chars
data = string.sub(data, 5, (string.len(data) -8))
inputs = convert(data)

else
log('Satel: zajęty')
end

-- update the inputs in the LM database
for i = 1, #inputs do
GA = '0/0/'.. tostring(91+i-1)
grp.update(GA , inputs[i])
end