Hello, on 10/31/2006 10:54 PM Prathaban Mookiah said the following: > I thought of sharing my experience of writing a controller to remotely > control a robot through a webserver using PHP. Though I could not use PHP > alone to do the entire job due the high delay it takes to connect to the > telnet port on the robot, (I adopted the PHPTelnet class written by Antone > Roundy - http://www.geckotribe.com/php-telnet/), I could not resist using it > for some part of the application.
I am not sure why you have such an high delay to connect to the robot. Anyway, you may want to take advantage of the fact that PHP supports persistent socket connections using the pfsockopen function. This certainly avoids the overhead of establishing a socket connection on every request. > So the model I used for my purpose is this: > > Browser ---------> WebServer ---------> Java --------> Robot > AJAX PHP > > I used PHP to communicate between the Java program which I run in the > background and the AJAX calls from the browser. This setup works fine for my > purposes and satisifies the strict time constraints. > > If someone has a better idea of implementing this thing in PHP, please do let > me know your comments. For using AJAX, you may want to take a look at this forms class. It comes with a plug-in that lets you submit forms without reloading the current page. It uses an AJAX approach named COMET. This may be important for your project because in COMET applications the browser establishes a single connection to the Web server and uses it to return multiple responses from the server without reconnecting. COMET is great in particular for monitoring server site activity that may take a long time to finish. While the activity is not finished, the server can send new messages to update the browser. http://www.phpclasses.org/formsgeneration There is a lot more to say about COMET based responsive PHP AJAX applications. You may want to read about it here: http://www.phpclasses.org/blog/post/58-Responsive-AJAX-applications-with-COMET.html -- Regards, Manuel Lemos Metastorage - Data object relational mapping layer generator http://www.metastorage.net/ PHP Classes - Free ready to use OOP components written in PHP http://www.phpclasses.org/ -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
