hi,

see robotics engineering is an Interdisciplinary stream, students from any of the branch may change their career to robotics engineering. since you studied Electrical and electronics engineering is diploma stream, you may pursue b.tech course is electronics and communication engineering or EEE , I would prefer Ece FOR future career in robotics engineering. however for m.tech course you need to appear in gate exam from ece or cse paper, you may opt for m.tech in robotics engineering or embedded system to make a career in robotics development. IIT kanpur offers m.tech in robotics and automation. so start preparing to reach your destination.

hope it would help.