Except in the case for the 787, you can't unplug the APU's mid-flight, and so hence the fire hazard. Speaking about that just how robust (and openly discussed) are the Li+ charging circuitry in these huge power storage arrays? Is there any chance of independent review of these (The FAA could be the vehicle for certifying them for flightworthiness, except past experience with that process has been very problematic in detail).
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.