The C3 Smart Hub is a modular, off-grid IoT infrastructure platform developed by Autonomous IoT, designed to integrate environmental sensing, communications, lighting, and security functions into a single unit. It supports advanced connectivity options such as LoRaWAN, 4G/5G and Wi-Fi, and is sensor-ready for monitoring air quality, noise, water or soil conditions. The hub includes internal power storage with renewable energy support from solar and wind to minimise grid dependence and help meet sustainability targets. Its modular design allows scalable deployment across smart city, campus, transport, housing and industrial settings, enabling features like integrated lighting, CCTV, Wi-Fi hotspots and environmental data feeds. The system can connect to cloud platforms for remote management and analytics, providing real-time monitoring and operational insights. Autonomous IoT positions the C3 Smart Hub as a versatile solution for improving safety, efficiency, and environmental awareness in distributed outdoor environments