Q: Can you suggest reference books you have found helpfu?
A: There is ALOT of information on www.arm.com on the generic cores, and you'll want to search on the Cortex M0, M3, M4. In addition, you may want to consider "The Definitive Guide to the ARM Cortex-M3" by Joseph Yiu. He has also written one for the Cortex M4.
What are the engineering and design challenges in creating successful IoT devices? These devices are usually small, resource-constrained electronics designed to sense, collect, send, and/or interpret data. Some of the devices need to be smart enough to act upon data in real time, 24/7. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.