According to calculations and estimations performed by the folks at the University of Hawaii (who obviously have far too much time on their hands), if we account for all of the beaches around the world, together they contain around 7.5 x 10^18 grains of sand. Thus, the addressing space of IPv6 is sufficient to give each grain of sand its own unique IP address – and to do this for approximately 5 x 10^19 Earthlike worlds – so I don't think we're going to run out of IPv6 addresses in the foreseeable future.
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.