Bring your breadboard, microcontrollers and sensors — a Pico W, an ESP32, an Arduino, whatever you’re working with. Finished project or a bag of parts, it all fits. And bring your laptop, to work on code and flash your devices (get your laptop ready).
Plenty of projects need nothing but a USB cable. For multi-device projects that need a network and a backend, see On-Site IoT as a Service.