Kaa is an open source platform with an Apache 2.0 license; read more here: https://github.com/kaaproject/kaa/blob/master/LICENSE. ThingsBoard supports two editions; one is the community, which is what we are going to use, and the one is professional edition, for more serious users.
You can read more about this here: https://thingsboard.io/installations/. The only charges that a user will incur are from the hosting services of the Kaa platform.
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