How to develop a Python based app for PostmarketOS that can run also in Linux Linux environments - is there a well documented how to?

I am looking for a MicroPython Caldav Package to connect my ESP32 to my Caldav server, e.g. Nextcloud. Did that anybody before?

I own a #Jolla Phone 1 and #Intex Aqua Fish. Can I use it as a PostmarketOS Playground instead of buying a PinePhone Pro? Are the images save to flash and is the hardware good enougth to run #PostmarketOS?

I am looking for an #ESP32 Shield that adds #ZigBee communication to my ESP. Would be great if #MicroPython packages are available. Are there any known projects available, you could reference me?

This is the home of pySmartHome - a MicroPython and ESP32 based private Smart Home under your control.

I use it to read the temperature, humidity and pressure in different rooms.

Watchy is an E-Paper watch with open source hardware and software. It has a barebones design utilizing the PCB as the watch body, allowing it to be worn as-is, or further customized with different 3D printed cases and watch straps. It is a unique timepiece that is also a wearable development platform, allowing users to create their own experience. Watchy and sqfmi

Can you recommend any cross platform Python app development frameworks where you write code once and it can be deployed to Linux, Android, Windows, MacOS and iOS.