# OI Web Server

OI Embedded ships with a built-in web server and PHP script support.

WARNING

OI Windows does not provide a web server.

# Web Server

OI's embedded web server is Lighttpd without SSL support.

# PHP support

OI's supported PHP version is PHP 5.6.26 with extensions:

  • Curl
  • GD
  • FPDF
  • FTP

Note

To avoid timezone error the following line of code has to be used in php script:

date_default_timezone_set(exec("cat /etc/timezone"));

or by using following require all needed default settings will be set:

require 'init_defaults.php';

init_defaults.php is located in '/var/oi/www/php_inc'

# PHP script locations accessible by http

Touch screen http url File system directory Permission Description
http://touch_screen_IP/ /tmp/www/ read/write Symlink pointing to storage directory on data card.
http://touch_screen_IP/app/ /tmp/app/httpscripts/ read/write Contains all files which are part of the current oi application from app's directory 'appname___httpscripts'.
NOTE: this directory is completely deleted at application start and then whole 'appname___httpscripts' directory is copied here.
http://touch_screen_IP/fw/php/ /var/oi/www/php/ read only Contains php scripts which are part of the firmware. Examples: http://touch_screen_IP/fw/php/examples
http://touch_screen_IP/fw/js/ /var/oi/www/js/ read only Contains javascript files which are part of the firmware.

# Internal PHP scripts location

File system directory

File system directory Permission Description
/var/oi/www/php_cli read only Contains internal php scripts which are part of the firmware. These scripts are intended to be run from command line.
/var/oi/www/php_inc read only Contains internal php scripts which are part of the firmware. These scripts are intended to be included.

# Using the Web Server

OI can provide webpages for the terminal as well as specific pages for the application.

# OI Terminal Webpages

Webpages for the terminal itself can be loaded on the data card under the 'www' directory. To test, place an index.html file in this directory:

<html>
<body>
  HELLO
</body>
</html>

Then you can browse to http://touch_screen_IP/ and load the page.

# Application Specific Webpages

You can include webpages specifically for your application by including them in your 'appname___httpscripts' directory.

When the screen boots, or when you Select Application, the contents of the httpscripts directory is copied to the /var/volatile/tmp/app/httpscripts folder. You can then view these webpages at http://touch_screen_IP/app/

Note

The httpscripts directory is created whenever an HTTP Script component is created. You do not need to create the component if you are just using the directory to serve webpages for your application.

If you do not use the component, you simply need to create the directory and the contents will be copied.

Note

You can provide PHP files as scripts for your application. Within your PHP scripts you can communicate with OI's XML-RPC server to fetch tag data, or interact with the SQLite database for your application to provide advanced data interaction functionality.

WARNING

Serving webpages does consume some processing capacity. Be mindful that server intensive scripts could affect runtime performance of the screen.

Last Updated: 7/21/2018, 7:56:32 PM