You have to enable the serial port via `sudo raspi-config`

[es101]

You have to enable the serial port via sudo raspi-config select option 5 -> option P6 -> select NO for logging and Yes for enabling

Also disable UART: sudo systemctl disable hciuart

Originally posted by @nabbl in https://github.com/enocean-js/node-enocean/issues/28#issuecomment-491761041

with

dtoverlay=pi3-miniuart-bt

in config.txt it works now!