Lutron Electronics Embedded Software Design Engineer interview questions

Took a call interview. Basically asked me all the details on my resume. Mostly interested in C++ experience and RTOS. They asked how many years of experience I had with these. I got a reject via email.

Applied online and then a call was setup.It was a technical interview which was focused mainly on my resume.The interviewer had prior experience in one of the projects I did during an internship and asked in detail about that.Ex-- Details of I2C/SPI buses.Signals and functionality of these buses in an embedded product. Also the interview included product usage and implementation scenarios based on their current product range.I was basically asked to figure out how to setup a sensor which controls a window shade.Questions were based on what type of sensor/the sensing and other implementation and response time based on requirements.