Backlog/112

Mainly implements issue https://github.com/telefonicaid/fiware-connectors/issues/112.

It implements issue https://github.com/telefonicaid/fiware-connectors/issues/104 as well.
Fixed in https://github.com/telefonicaid/fiware-connectors/commit/8077d5cd5af1761d33dd10e2d2aa248ee88e77a1