Clone this repository (you really have to clone it, don't just download the ZIP file. During the build process the git hash gets embedded into the firmware. If you download the ZIP file a build error will occur)
Adjust the COM port in the file "platformio_override.ini". It occurs twice:
upload_port
monitor_port
build: platformio run -e generic
upload to esp module: platformio run -e generic -t upload
other options:
clean the sources: platformio run -e generic -t clean