Vidya:
This site is setup as a place to engage in technical discussion and get help with work that you have engaged in but with which you need help. Soliciting for and trying to obtain free access to materials will best be handled through your own searches and investigations to locate sites that have posted such information.

Determination of the best protocol is something probably best left to your own investigation of the tradeoffs of various schemes, applications, and requirements. As such you have the task at hand to become familiar and learned with the technologies with which you intend apply. Feel free to post various questions about your technology persuit and you may be able to tap into the experience of some other members here that have related knowledge.

When you get to the state of implementation you may also post questions regarding your hardware and/or software and it is likely that someone here can help guide you toward an answer.

One thing that this site provides is access to 1000's of previous discussions that can be searched and referenced to aid in learning how to solve problems in your own projects. That knowledge base is built through the joint activity of users posting pointed questions and others engaging in providing answers or providing pertinent discussion. As such it is not particularly useful to the building of the usefulness of this site if members engage in private email exchanges instead of interactive discussion here.

Michael Karas