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Web Server for Embedded Systems
Klaus-D. Walter
After the “everybody-in-the-Internet-wave” now obviously follows the “everything-in-the-
Internet-wave”. The most coffee, vending and washing machines are still not available about
the worldwide net. However the embedded Internet integration for remote maintenance and
diagnostic as well as the so-called M2M communication is growing with a considerable speed
rate.
Just the remote maintenance and diagnostic of components and systems by Web browsers via
the Internet, or a local Intranet has a very high weight for many development projects. In
numerous development departments people work on completely Web based configurations
and services for embedded systems. The remaining days of the classic user interface made by
a small LC-display with front panel and a few function keys are over. Through future
evolutions in the field of the mobile Internet, Bluetooth-based PANs (Personal Area
Network's) and the rapidly growing M2M communication (M2M=Machine-to-Machine) a
further innovating advance is to be expected.
The central function unit to get access on an embedded system via Web browser is the Web
server. Such Web servers bring the desired HTML pages (HTML=Hyper Text Markup
Language) and pictures over the worldwide Internet or a local network to the Web browser.
This happens HTTP-based (Hyper Text Transfer Protocol). A TCP/IP protocol stack –that
means it is based on sophisticated and established standards– manages the entire
communication. Web server (HTTP server) and browser (HTTP client) build TCP/IP-
applications. HTTP achieved a phenomenal distribution in the last years. Meanwhile millions
of user around the world surf HTTP-based in the World Wide Web. Today almost every
personal computer offers the necessary assistance for this protocol. This status is valid more
and more for embedded systems also. The HTTP spreads up with a fast rate too.
1. TCP/IP-based HTTP as Communication Platform
HTTP [1] is a simple protocol that is based on a TCP/IP protocol stack (picture 1.A). HTTP
uses TCP (Transmission Control Protocol). TCP is a relative complex and high-quality
protocol to transfer data by the subordinate IP protocol. TCP itself always guarantees a
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