help with some php to test router connection


Occasional Visitor
Reason for this question is that I think my AX88U is no good and _sometimes_ gives me bad wifi-connections. But do not focus on that. :)

I have an Apache/php server on my lan. What I want is a webpage on that server that when I connect to it, it will continuously exchange data with my android phone browser. At least a few packets per second so I in real-time can see that the wifi-link is working. I am not interested in testing speed, just that the connection is okay.
Do you have a link to some php that could do this or similar?


Part of the Furniture
Any reason it has to be web traffic? A continuous ping ought to keep the connection alive.


Occasional Visitor
The reason I want web traffic, is that I have tried ping via an app called Fing. Fing makes some 30 rapid pings and shows the result on a graph. I don't trust it, because all failed pings are shown as the first one or two of the 30, never number 15 or so. I wish that function of Fing would be possible to configure. (And I guess that there are other apps that would keep pinging, more like how I want it.

I guess that there is a difference between the many ICMP-packets and one TCP connection.

I pasted some code below that in the best worlds would do both ping and keep a connection to the server. Problem is that it will not display the progress, but instead all the rows when finished.

$num = 0;
header( 'Content-type: text/html; charset=utf-8' );
echo ("test of connection<br>"); //<-- send this to the client

while($num < 16 ) {
    echo ($num . ": ");
    echo ping ("");
    echo "<br>";
    usleep ( 100000 ); // pause 100ms between the pings

function ping($host, $timeout = 1) {
    /* ICMP ping packet with a pre-calculated checksum */
    $package = "\x08\x00\x7d\x4b\x00\x00\x00\x00PingHost";
    $socket  = socket_create(AF_INET, SOCK_RAW, 1);
    socket_set_option($socket, SOL_SOCKET, SO_RCVTIMEO, array('sec' => $timeout, 'usec' => 0));
    socket_connect($socket, $host, null);
    $ts = microtime(true);
    socket_send($socket, $package, strLen($package), 0);
    if (socket_read($socket, 255)) {
        $result = microtime(true) - $ts;
    } else {
        $result = false;
    return $result;



Occasional Visitor
The code above is no good, here is a shorter/better version that works for me. When I have been connected to 2.4GHz WiFi for a longer period, this code shows that I have a bad connection. If I disconnect from my RT-AX88U and reconnects, it is smooth again. I wonder why.

Link to my server: testconn.php

// ob_end_flush();
// ob_implicit_flush();
$num = 0;
echo("testing that a slow constant flow<br> of data is smooth through wifi<br>");
while($num++ < 240) { // max number depends on pause length and web server settings
  if ( ($num % 30) == 0) {echo " " . $num/2 . "s<br>";}
  else if ( ($num % 2) == 0) {echo "\\";}
  else {echo "/";}
  usleep ( 500000 ); // pause 500ms between each dot
echo("done<br>"); //<-- send this to the client
<button style="height:50px;width:150px;" onClick="window.location.reload();">again</button>

Chrome/Firefox on my phone changes formatting after more than a minute. Would like to know why. Any suggestions for improvements are of course welcome.


Occasional Visitor
Safari does not show anything until the whole page is loaded. :( But it is useful for Firefox and Chrome,

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