As per your qualifications you may note the following points:
a. BTech will land you a contractual job in engineering college. As per AICTE norms the Assistant Professor eligibility criteria is MTech. So colleges approved by AICTE shall not be able to employ you.
b. You may check out Deemed universities eligibility criteria for faculty postilion. Some colleges may consider your industry experience and PGDIT degree. Refer websites of Deemed universities for their recruitment norms.
c. You may check out colleges offering BSc, BCA and their post graduate courses. Most of them need NET/SET cleared score. Some of the colleges may consider if they are private.
d. I would suggest that you can give GATE exam in Jan/Feb 2017 and then join for MTech. In the second year along with your project work, college will provide you teaching assistantship. After second year, you will get your MTech results. Then you can be employed by any engineering college.
e. Another option, if you are interested could be to start your own coaching classes. Then qualification is no bar, time is no bar and you can decide how much you want to earn.
Hope this helps.
Autograph your work with excellence!