Which one of the kaa features is free?

[ZM]

Hello!

I want to use of kaa as server in my android application for my university project, i need a server for user registration and login in my app, i need server database, and finally this server should connect to a gateway and control smart devices. So i want t use free and open source iot platform as server, i want to know that Which one of the kaa features is free?