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Document Server

LCD Display & Smart Card Reader Specifications

In Document Server hardware we have two own devices:

LCD Display
Smart Cart Reader

In order to free Document Server software from hardware communication, we have two daemons to communicate in abstract way with those devices.

LCD Display Daemon

This daemon handles the LCD display with seven buttons and three multi-color leds. This daemon works as a browser, it can display xml pages. At start, daemon shows an index page with all processes listed. User can select a process and go to the process index page.

<page>
    <head>
        <title>Example</title>
    </head>
    <body>
        <text>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumyeirmod tempor
        invidunt ut labore et dolore magna aliquyam erat, sed diamvoluptua. At vero eos et accusam et justo duo dolores et</text>
        <button id="close">Ok</button>
        <img>/path/to/file.jpg</img>
        <text>Check Status</text>
        <button id="check">Check</button>
    </body>
</page>

The process send its own index page at start. The daemon send the id of the button, if selected, and wait for the next page.

Smart Card Reader Daemon

This daemon manage the login by a smart card. All process can listen the login and logout events by D-BUS. The process send a signal when an user is logged.