Actually soft modems usually consume more power than dedicated hardware modems. The Cognovo spokesman is saying his company's new chip achieves about the same power to maybe a few percent more power than a hardware modem -- and if that's true, that's quite an acheivement.
It is quite true that a soft modem will consume less power as compared to a hardware based modem, but the modem needs to be tightly coupled with the device operating system to get the best our of the software modem. So it depends totally on the device integration and efficient drivers.
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.