The rise of the IoT era has witnessed the emergence of new and disruptive Low Power Wide Area technologies. One of those innovations, Narrowband Internet of Things (NB-IoT), is a new standard specified in the 3GPP project to enable a wide range of IoT cellular applications by focusing on extended coverage, high-density deployment, low energy consumption, and low-cost end device. Furthermore, this wireless technology is a promising replacement candidate for legacy cellular M2M systems, which will be slowly phased out by the 2G and 3G sunset.

Lightweight Machine to Machine (LwM2M) is a new device management protocol aspiring to go beyond the current de facto IoT messaging MQTT. This new framework offers a standardisation in IoT device management and information reporting, thus promoting a high-level of interoperability among applications and cloud services. Furthermore, Lightweight M2M over UDP presents a significant advantage compared to MQTT over TCP for low power cellular devices.

This paper documents the process of developing firmware for an IoT device utilising the two technologies mentioned above, and at the same time, supplies relevant knowledge and analysis on subjects encountered throughout the project execution.

The outcome of this thesis is a functional proof-of-concept low power IoT device, which is capable of delivering sensor measurements to an LwM2M server securely via NB-IoT. The thesis is going to be used as a reference design at Etteplan Embedded Finland Oy to speed up future developments.