Zoxcell required a secure IoT device capable of transmitting temperature and humidity data using cellular connectivity (2G/3G/4G/LTE). The device needed to include robust security measures, such as encryption using a secure element chip (Microchip ATECC608A), and seamlessly communicate with a cloud backend hosted on AWS or Google Cloud Platform (GCP). The project also required a user-friendly front-end for monitoring data and maintaining secure device authentication.

Semphos provided a comprehensive end-to-end solution, integrating hardware, firmware, and cloud services:

Custom Hardware Design: Created a dual-PCB setup using the TTGO T-call V1.4 development board (incorporating ESP32 and SIM800L modules) and a supplementary TMS board featuring an ATECC608A chip and DHT22 temperature and humidity sensor.

Firmware Development: Leveraged ESP-IDF v4.2 to develop secure firmware that supported GSM/GPRS communication via the SIM800L module and utilized the ATECC608A for secure authentication. The firmware published encrypted data to AWS IoT Core, ensuring secure transmission.

Cloud Integration: Configured AWS IoT Core for device registration and secure data handling. A ReactJS-based front-end dashboard was developed to visualize the data, incorporating AWS Cognito for secure user authentication.

Data Security: Implemented mbedtls for encrypted data transmission, ensuring end-to-end security between the IoT device and cloud services.

The secure IoT device designed by Semphos enabled Zoxcell to achieve reliable and secure data transmission for temperature and humidity monitoring. The inclusion of a secure element chip ensured robust encryption and secure device authentication. The cloud integration and user-friendly dashboard allowed for easy data access and visualization, providing a scalable and secure solution for future deployments.