The new hunter Hydrawise watering computer has a mention of an API in the web interface. I inquired the necessary information from hunter to see what the possibilities would be and this was their reply (so other people using homey are informed about the current status)
Thank you for your inquiry to access the Hydrawise API.
We are currently rebuilding our API access utilizing OAuth2.
Our Beta version of OAuth2 will soon be released, to a limited number of invited business partners we expect to have full version release in the first half of 2019.
The Hydrawise API will only be provided to business partners.
API access for private use is not scheduled for release until Nov 2019.
When we are ready for your team to work on the integration we will contact you.
This will include our:
Terms & Conditions of Use (Business Agreement)
GDPR Privacy Agreement, which must be signed.
On the return of the signed Agreement, we will provide login details and documentation on using your OAuth2 authorization and the relevant scopes.