You need an EnOcean USB dongle:

Get one from Farnell.

You need an EnOcean push button:

Get one from Farnell or Houm.io :)

npm install
ENOCEAN_DEV=/dev/cu.usbserial-FTXMJJM6 nodemon index.coffee
[Click click]
{ enoceanAddress: '008baffe', event: 'keydown', key: '1' }
{ enoceanAddress: '008baffe', event: 'keyup', key: undefined }
{ enoceanAddress: '008baffe', event: 'keydown', key: '2' }
{ enoceanAddress: '008baffe', event: 'keyup', key: undefined }
{ enoceanAddress: '008baffe', event: 'keydown', key: '3' }
{ enoceanAddress: '008baffe', event: 'keyup', key: undefined }
{ enoceanAddress: '008baffe', event: 'keydown', key: '4' }
{ enoceanAddress: '008baffe', event: 'keyup', key: undefined }
{ enoceanAddress: '008baffe', event: 'keydown', key: '12' }
{ enoceanAddress: '008baffe', event: 'keyup', key: undefined }
{ enoceanAddress: '008baffe', event: 'keydown', key: '34' }
{ enoceanAddress: '008baffe', event: 'keyup', key: undefined }