...Specific configuration examples and technology overview is in https://sourceforge.net/p/esp32-acme-client/code/HEAD/tree/trunk/components/acmeclient/Configurations.md.
You can get this component from Espressif's component registry ( https://components.espressif.com/components?q=dannybackx ). Put this component into your project with
idf.py add-dependency dannybackx/acmeclient