A very easy, almost zero-configuration, ESP32 E-ink calendar. Configure your ESP32 Eink firmware in 3 easy steps.
https://cale.es Acts as a Web-Service that connects with your external APIs and renders your screens. This App is just a configuration tool to send your Screen the WiFi Credentials.

Please check the website to download the firmware and create an account to use the service to configure your WiFi access points and your Screens. This app has no other mission than that, and is fully open source, in case you want to check what it does or clone it for your own project.
In case you are interested, please find the code in this repository:
https://github.com/martinberlin/cale-app

This release includes a QR Code scanner, so you can link the CALE app to cale.es backend ( user -> API QR Code)
This will enable the application to list yor Screens. Please remember to define 2 WiFi access points and at least one Screen in CALE backend side. Remember to open Bluetooth. Workflow is like the following:

Api -> Scan QR -> on successful scan redirects to:
Select Screen -> Choose one
Bluetooth -> Select hardware target (ESP32)
Send configuration -> DONE. Your Screen should restart and refresh if the hardware is correctly wired and working together with the Eink

Thanks for trying this out, feel free to report if anything does not work like expected, you will find the support email in the WiFi Tab of the application.