UPnP server and control point implementation

We're now going to look at an implementation of a UPnP server and an associated checkpoint, written in C for LibUPnP. LibUPnP is a free implementation of a portable SDK for UPnP devices. Intel developed this library in 2000; it has since been released under a BSD license, to ensure better growth and support. Originally written for GNU/Linux, it has been ported to various operating systems, including FreeBSD, Solaris and Windows. The community around this open-source project is active, guaranteeing code reliability and responsiveness in the unlikely event of an implementation flaw. This is probably the most stable and efficient UPnP stack available.

We're going to put it into practice with a simple example, but one that will enable us to discover all the facets of LibUPnP programming: a virtual lamp, similar to the Intel Network Light. It can be controlled on or...