It was tough first round is of aptitude, followed by coding round , coding round was little tough, they asked about sata dtructures, sql, oop, java, c and third round technical interview and fourth round is hr.
Resume related questions and questions related to projects. questions around basic concepts of embedded systems like communication protocols and sensor interfacing, what microcontrollers have worked on, explanations of concepts used and applied in your project. Some HR related questions at the end.