TCP receive with DENON Amplifier

[Hadeel]

Hi!
I am trying to connect DENON Amplifier with TCP. 
While I can send message successfully to DENON, I cannot receive reply from it.
With my laptop I tried TCP with telnet and confirmed that DENON gives back response to my terminal.

Following is what I have tried with resident script (interval = 0) but I got no message.

Thank you very much in advance!

Code:

if not server then
  require('socket')
  server = socket.udp()
  server:setsockname('127.0.0.1', 5485)
end

if not tcp then
    tcp = assert(socket.tcp())
    local res, err = tcp:connect('192.168.0.1', 23)
    if res then
      return tcp
    else
      tcp:close()
      return nil, err
    end
end

function denon_receive(tcp)
res, err = tcp:receive()
  if not res then
    return nil, err
  end
   return res
end

while tcp do
  res, err =denon_receive(tcp)
    if res ~= nil then
      log(res,err)
    end
    if (res == nil) then
      log('no response')
    end
end

[admin]

receive without timeout will wait until a new line (\n) character is received.

Try this script instead:

Code:

sock = require('socket').tcp()
sock:settimeout(10)

res, err = sock:connect('192.168.0.1', 23)
if res then
  while true do
    res, err, partial = sock:receive()

    if res then
      log('receive', res)
    elseif partial then
      log('partial', partial)
    elseif err == 'closed' then
      break
    end
  end
else
  log('connect failed', err)
end

sock:close()

[Hadeel]

Thank you admin!
It did solve the issue and I can now get the reply from the amplifier!
The issue was, as you said, this amplifier replies message without a single new line (\n) character....

Thank you so much as always!