backlog/215

This PR implements the issue https://github.com/telefonicaid/fiware-connectors/issues/215
Fixed in https://github.com/telefonicaid/fiware-connectors/commit/d234c147a821c458edc0a4a5fc69dac91f2f3732 (I hope... my editor show me the right indentation... I think it was a question of using white spaces instead of tabs).