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\chapter{Conclusions for the follow-up bachelor thesis}
This semestral thesis provided a brief introduction to 4G/5G mobile networks for the Internet of Things (IoT) applications in the embedded electronic systems. Related communication protocols for 4G IoT networks (LPWAN NB-IoT and LTE-M) and 5G IoT networks (5G NR - URLLC) were described and a survey of two selected chipsets for 4G networks (Nordic Semiconductor nRF9160) and 5G networks (Quectel RM520N) and their development modules and kits was made.
One of the development kits (nRF9160 DK) was then used for practical demonstration of an IoT device with LPWAN connectivity on an example of a combined burglary and fire alarm system with 4 sensors, transferring data to a remote cloud server via MQTT protocol. This demo allowed to establish a firmware development base for 4G IoT devices based on nRF9160 System-in-Package and get familiarized with the software development kit by Nordic Semiconductor with Zephyr RTOS support.
Since there seem to be issues with a delivery of the appropriate 5G development kit by Quectel, being ordered for several months already, it would be advisable to focus the follow-up bachelor thesis only to 4G communication kits with nRF9160 System-in-Package and to further explore extensive firmware possibilities of this system for reliable and secure industrial IoT communication, specifically:
\begin{itemize}
\item Firmware upgrades via FOTA (firmware over the air)
\item Implementation of ARM TrustZone technology for firmware protection against unauthorized changes
\item ARM CryptoCell solution for high-performance cryptography
\end{itemize}
Experimental parameters of IoT communication (power consumption, lattency, reliability, effective range in complicated urban environment) shall also be verified, comparatively for NB-IoT and LTE-M protocols.
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