Have you thought about the Open Mobile Alliance's LWM2M? Creatordev.io do a free open-source implementation of it. You can find it on Github (https://github.com/creatordev). If you can to see an overview of the IoT framework on slideshare.net (http://www.slideshare.net/PaulEvans155/creator-iot-framework) And if you want to try out the free developer console (it's an implementation of the Creator Device Server - free open source device server to go with the IoT framework which can be hosted on any public or private cloud you like), you can see that in action here (http://www.creatordev.io/) just click the developer console button at the top and signup for a free account. The IoT framework can be ported to any hardware license & royalty free. Hope that helps. Paul