BARCELONA, Spain--For the past five years, the GSMA has sought to highlight the potential of the growing machine-to-machine (M2M) and Internet of Things (IoT) market with a dedicated space at its Mobile World Congress trade shows. And this year is certainly no different, with the GSMA touting an "Innovation City," a reflection of the fact that devices with wireless connections were spreading across entire cities. The exhibition space certainly is a mini city unto itself here, complete with cutting-edge demos of the latest and greatest connected applications and devices from the likes of AT&T, Sierra Wireless and others. Andrew Parker, project marketing director for the GSMA, offered a look at eight of the most interesting applications, devices and technologies on display in the area. Check out this slideshow to see the city.