socket problem

boboxx

Hello Guys,

I'm writing an application to communicate to a Lantronic Xport device… The problem is having a issue currently issuing commands to the device without having a delay between the send and the read. I’m not sure what I’m doing wrong but it’s starting to drive insane!

I’m establishing the connection using:
$phost=”192.168.1.10”;
$pport=’’10001”;
$fp = @fsockopen("tcp://" . $phost, $pport, $errno, $errstr, 15);

I have a function like this to write to the socket:
function Send($BusString){
if ($this->psocketconnected){
$TT ='';
foreach ($BusString as $BusStringValue) {
$TT .= chr($BusStringValue);
}
fwrite($this->psocket, $TT);
fflush($this->psocket);
return True;
}
return False;
}

And a function like this to read :
function Get(){
sleep(1); //< -- here is my problem…
if ($this->psocketconnected){
$cbyte = '';
$cbyte = fread($this->psocket, 1024);
return $cbyte;
}

Now here is my problem, this is working but in order to make it work I had to add the sleep(1); to my read function. As you can imagine, sending and reading multiple values just make the session/page time out (30sec execution time).

I have written another application to try to debug this and I have no problem sending and receiving values from the device and there is no sleep or delay involved.
The vales that I am writing look like this (hex):
01 51 70 C2 02 48 4E 43 05 03 67 04 FF FF 01 70 C2 04 FF FF
And a response would look like this:
01 70 51 C2 02 48 4E 43 40 3A 31 33 30 03 70 FF FF

Would anyone have any ideas to what could be the problem?

Thanks

sdjensen

To avoid the timeout, use set_time_limit to 0 (= unlimited / no limit)

set_time_limit(0);

Are you reading the port in blocking mode or nonblocking mode?

see information on stream_set_blocking

boboxx

yes I am in blocking mode:
stream_set_blocking($fp, 1);

I know I can extend the time out periode, but it still dosent fix my problem as I have to make about 300 to 400 request if not more and this would take to much time...

boboxx

well I have found a semi solution:

function Get(){
	//sleep(1); //we have to sleep a bit before we start reading from socket
	//usleep(10000);
	if ($this->psocketconnected){
		$cbyte = '';
		// sleep(1);
		// $cbyte = fread($this->psocket, 1024);

		$done = False;	
		$i = 1;	
		while((!$done) or ($i > 100)){
			$char = fgetc($this->psocket);
			$cbyte .= $char;
			if($char == (chr(0xFF))){
				$char2 = fgetc($this->psocket);
				$cbyte .= $char2;
				if ($char2 == (chr(0xFF))){				
					$done = True;
				}
			}

			$i++;				
		}


	return $cbyte;
	}		
}