I am happy to share a project that will hopefully help out developers looking for a c**/native socket.io solution that does not depend on the Boost libraries but instead uses poco c** libraries @ pocoproject.org
This repo uses the websocket transport and other features of the Poco C++ libraries at http://pocoproject.org/, which are very easy to use and understand, have been tested on multiple platforms (Android, iOS, Win32, Linux et al), and leave a very small footprint in deployment (my Android test client is no more than 1.5MB).
Some socket.io features are still to be implemented (endpoints, et al), but the solution is working for basic socket.io connections from a native app. I also plan to include JSBinding capabilities once I find the time.
Enjoy, and I welcome any feedback!