How to get started with websockets on VPS?

i have written a php socket chat with drawnings: http://46.101.253.109/sasha/full_chat.php. WebSocket should connect to test.php

when it trying to connect to the server “test.php” starts long loading, and then error VM3074:161 WebSocket connection to 'ws://46.101.253.109:8400/demo/test.php' failed: Error in connection establishment: net::ERR_CONNECTION_TIMED_OUT

js connection: ws = new WebSocket('ws://46.101.253.109:8400/demo/test.php')

test.php:

$host = '46.101.253.109'; //host
$port = '8400'; //port
$null = NULL; //null var
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
socket_set_option($socket, SOL_SOCKET, SO_REUSEADDR, 1);
socket_bind($socket, 0, $port);
socket_listen($socket);
while (true) {
    //...
}

to start server i going to http://46.101.253.109/sasha/test.php

on localhost same steps words aswell. Looks like it cant find a server. How i can start it working? I’m using wordpress droplet