This document describes the hardware and software architecture and user programming of the XPLR-IOT-1 application platform. Providing a complete platform for developing various proof-of-concept IoT applications, the XPLR-IOT-1 showcases products from all u-blox product centers - including NORA-B106 and NINA-W156 short range radio modules, SARA-R510S cellular modules, MAX-M10S satellite positioning modules, and the Thingstream IoT service delivery platform.