Enter in web interface of Pyxis, using IP address or link http://pyxis.local
Choose in section “1 Choose technologies” – Speech recognition. Save changes.
In section “5 Advanced technologies setup” choose Recognizer type – Google Home or Amazon Echo.
Save changes and restart Raspberry Pi.
Connect your Smart Home devices to Amazon Echo using: App, Web interface or voice control (ask: “Alexa, find my Smart Home Devices”).
When Alexa stop discovering, she will inform about finding devices. In Alexa App and in Web interface you will see discovered devices.