Accept only single connection

PHP
1

I am creating a socket script that will listen to our 3 devices.and the device is setup in one server ip and one port only.


 $file = fopen('txt.log','a+');
    $server = stream_socket_server('tcp://'.$ipserver.':'.$port, $errno, $errorMessage);

    if(!$server) {
        echo "$errorMessage ($errno)<br />\
";
    }
    else{

        while($client = @stream_socket_accept($server,$timeout)) {
               stream_copy_to_stream($client, $file);
               fclose($file);
               fclose($client);


        }

    }


but the problem is that if one device is connected,the two devices cannot connect anymore.I appreciate some one can help me how to get this work.

Thank you in advance.

2

Hi i am using stream_select to accept my server with multiple connection.but i am having problem in reading the data that was sent from the device.


 $file = fopen('txt.log','a+');
	
	
    $server = stream_socket_server('tcp://'.$ipserver.':'.$port, $errno, $errorMessage);

    if(!$server) {
	   
         echo " $errorMessage ($errno)\
";
    }
    else{
          
		   $read   = array($server);
           $write  = NULL;
           $except = NULL;
		   
		 
        while($num_changed_streams = @stream_select($read, $write, $except, $timeout)) {
             $line = fread($server,1024); //here i don't know how to read the stream
			 echo $line;
        }
	  
     

      fclose($server);
    }

thank you in advance.

3

You can check this example to serve many clients

<?php

// Set time limit to indefinite execution

set_time_limit (0);

// Set the ip and port we will listen on

$address = '192.168.0.100';

$port = 9000;

$max_clients = 10;

// Array that will hold client information

$clients = Array();

// Create a TCP Stream socket

$sock = socket_create(AF_INET, SOCK_STREAM, 0);

// Bind the socket to an address/port

socket_bind($sock, $address, $port) or die('Could not bind to address');

// Start listening for connections

socket_listen($sock);

// Loop continuously

while (true) {

    // Setup clients listen socket for reading

    $read[0] = $sock;

    for ($i = 0; $i < $max_clients; $i++)

    {

        if ($client[$i]['sock']  != null)

            $read[$i + 1] = $client[$i]['sock'] ;

    }

    // Set up a blocking call to socket_select()

    $ready = socket_select($read,null,null,null);

    /* if a new connection is being made add it to the client array */

    if (in_array($sock, $read)) {

        for ($i = 0; $i < $max_clients; $i++)

        {

            if ($client[$i]['sock'] == null) {

                $client[$i]['sock'] = socket_accept($sock);

                break;

            }

            elseif ($i == $max_clients - 1)

                print ("too many clients")

        }

        if (--$ready <= 0)

            continue;

    } // end if in_array

    

    // If a client is trying to write - handle it now

    for ($i = 0; $i < $max_clients; $i++) // for each client

    {

        if (in_array($client[$i]['sock'] , $read))

        {

            $input = socket_read($client[$i]['sock'] , 1024);

            if ($input == null) {

                // Zero length string meaning disconnected

                unset($client[$i]);

            }

            $n = trim($input);

            if ($input == 'exit') {

                // requested disconnect

                socket_close($client[$i]['sock']);

            } elseif ($input) {

                // strip white spaces and write back to user

                $output = ereg_replace("[ \	\
\\r]","",$input).chr(0);

                socket_write($client[$i]['sock'],$output);

            }

        } else {

            // Close the socket

            socket_close($client[$i]['sock']);

            unset($client[$i]);

        }

    }

} // end while

// Close the master sockets

socket_close($sock);

?>
4

I could not get all my clients to connect to our server in socket,it only connect one client at a time when a new connection made.
can you help me on this please.



// Set time limit to indefinite execution
set_time_limit (0);
// Set the ip and port we will listen on
$address = '192.168.0.11';//server ip demo only.
$port = 123;
$max_clients = 10;
// Array that will hold client information
$client = array();
// Create a TCP Stream socket
$sock = socket_create(AF_INET, SOCK_STREAM, 0);
// Bind the socket to an address/port
socket_bind($sock, $address, $port) or die('Could not bind to address');
// Start listening for connections
socket_listen($sock);
// Loop continuously
while (true) {
   $file = fopen('txt.log','a');
    // Setup clients listen socket for reading
    $read[0] = $sock;
    for ($i = 0; $i < $max_clients; $i++)
    {
        if (isset($client[$i]))
        if ($client[$i]['sock']  != null)
            $read[$i + 1] = $client[$i]['sock'] ;
    }
    // Set up a blocking call to socket_select()
	$write = null;
    $except = NULL;
	$tv_sec = NULL;
	echo "connecting";
    $ready = socket_select($read,$write,$except,$tv_sec);
    /* if a new connection is being made add it to the client array */
    if (in_array($sock, $read)) {
        for ($i = 0; $i < $max_clients; $i++)
        {
            if (!isset($client[$i])) {
			
                $client[$i] = array();
				 socket_set_nonblock($sock);
                $client[$i]['sock'] = socket_accept($sock);
				  $file = fopen('txt.log','a');

                echo("Accepting incomming connection...\
");
                break;
            }
            elseif ($i == $max_clients - 1)
                print ("too many clients");
        }
        if (--$ready <= 0)
            continue;
    } // end if in_array

    // If a client is trying to write - handle it now
    for ($i = 0; $i < $max_clients; $i++) // for each client
    {
        if (isset($client[$i]))
        if (in_array($client[$i]['sock'] , $read))
        {
            $input = socket_read($client[$i]['sock'] , 1024);
            if ($input == null) {
                // Zero length string meaning disconnected
                echo("Client disconnected\
");
                unset($client[$i]);
				fclose($file);
            }
            $n = trim($input);
            if ($n == 'exit') {
                echo("Client requested disconnect\
");
                // requested disconnect
                socket_close($client[$i]['sock']);
            }
            elseif ($input) {
                echo("Receiving data\
");
                // strip white spaces and write back to user
                $output = ($input);
                //socket_write($client[$i]['sock'],$output);
				 fwrite($file,$output);
				 echo $output."\\r\
";

				
            }
        } else {
            // Close the socket
            if (isset($client[$i]))
            echo("Client disconnected\
");
			
            if ($client[$i]['sock'] != null){
                socket_close($client[$i]['sock']);
                unset($client[$i]);
			
				
            }
			
        }
		
    }
	fclose($file);//closing file
} // end while
// Close the master sockets
echo("Shutting down\
");
socket_close($sock);
fclose($file);
5