miniupnpc-libevent :

UPnP IGD control point (ie client) using libevent

http://libevent.org
https://github.com/libevent/libevent

The UPnP Event code needs SUBSCRIBE / UNSUBSCRIBE / NOTIFY HTTP methods.
Implementation is added to libevent 2.2.x :
https://github.com/libevent/libevent/commit/8dcb94a4ca0999bdada6baa2a986f4c00a922060


TODO : improve error handling / reporting