Thingsboard CLA

By making a contribution to this project, I certify that:

(a) The contribution was created in whole or in part by me and I
    have the right to submit it under the Apache 2.0 license; or

(b) The contribution is based upon previous work that, to the best
    of my knowledge, is covered under an appropriate open source
    license and I have the right under that license to submit that
    work with modifications, whether created in whole or in part
    by me, under the Apache 2.0 license; or

(c) The contribution was provided directly to me by some other
    person who certified (a), (b) or (c) and I have not modified
    it.

(d) I understand and agree that this project and the contribution
    are public and that a record of the contribution (including all
    personal information I submit with it) is maintained indefinitely
    and may be redistributed consistent with this project or the open 
    source license(s) involved.
    
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The text of this license is available under the [Creative Commons Attribution-ShareAlike 3.0 Unported License](http://creativecommons.org/licenses/by-sa/3.0/).  It is based on the Linux [Developer Certificate Of Origin](http://elinux.org/Developer_Certificate_Of_Origin), but is modified to explicitly use the Apache 2.0 license
and not mention sign-off.