There are currently two versions under development: Yggio 2 & Yggio 3. This documentation is for Yggio 2.
As of now, Yggio 3 has not been released to production. However, it is possible to use an alpha version of Yggio 3 today. Please contact us if you are interested. The main difference between the versions is Yggio 3 uses the FIWARE standard for both API and data models. In Yggio 2 you only have the option to use FIWARE Data Models for some of the devices. Also, Yggio 2 does not offer the FIWARE API.