How to organize data loading via TCP?

Question

linux

Hello! Can you suggest what I'm doing wrong.
There is a device that transmits data on the com port! These data must be received and transferred to the WEB server for further processing and loading into the database.
I receive data and send it to the server, but something goes wrong on the server side. Opened port 10000
on the web server (UBUNTU) with the command

<b> iptables -A INPUT -i eth0 -p tcp —dport 10000 -j ACCEPT</b>

Disabled the firewall on the server.
On one of the pages of the Yii2 application I inserted the code

$address = '192.168.1.180';
  $port = 10 000;
  $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);

  socket_connect($socket, $address, $port);
  socket_write($socket, "GET / HTTP/1.0\r\n\r\n");

  $result = "";

  while($read = socket_read($socket, 1024))
  {
      $result .= $read;
  }
  socket_close($socket);

  echo "Полученный результат:  $result\r\n";

But an error comes up

PHP Warning – yii\base\ErrorException
socket_connect(): unable to connect [111]: Connection refused

If I put port 80. there are no errors.
Can you explain, those who dealt with such problems, how to organize it correctly?

Answer 1

Look at the socket_listen function.