This page is stitching a few things together, read and implement:
Zensehome with Websupport (for Webhooks)
If You dont own an Alexa, You can use other of the IFTTT Triggers - Like, turning on the lights when Your phone enter an area
Another issue is the use of "If This Then That, also known as IFTTT".
The purpose is to get this flow:
Where the Webhook was build in Zensehome with Websupport (for Webhooks) and the Telnet in Zensehome API interfacing