...It doesn't require an expensive gateway to function, once configured, all it needs is a power supply and a Wi-Fi access point.
ESL Firebase Edition V2.0 allows you to operate as many of them as you wish, provided that each has its own unique ID, and there's enough power and bandwidth for all of them.
For more information please visit https://github.com/Northstrix/Electronic-Shelf-Label-Firebase-Edition
You can find the tutorial on
V2.0: https://www.instructables.com/DIY-IoT-Electronic-Shelf-Label-With-Google-Firebas-1/
V1.0: https://www.instructables.com/DIY-IoT-Electronic-Shelf-Label-With-Google-Firebas/
The desktop app is made with the help of the ChatGPT.