I’ve developer account in NEST (Work with NEST) , but after 31/8/19 we can’t write in NEST, only read. Because NEST was sold to google and google don’t aloww to collect your own data, and less to write on NEST… So my integration in Hassio only alowed me to show info but not change it.
Making a integration in IFTTT (Webhook and NEST) now is possible to send instructions to NEST
You need a developer account with api Key in Home assistant, and api key in IFTTT for NEST as well