Support for the Middleware

[noandrea]

• I'm submitting a ...

  • bug report
  • feature request
  • support request => Please do not submit support request here, see note at the top of this template.

• What is the motivation / use case for changing the behavior?
  The middleware provides high level functionalities that are not possible to get from the node.

• Please tell us about your environment:

  • SDK Version: v6.0.1
  • Python version: v3.7.0

• Other information (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix, links for us to have context, eg. forum, telegram, etc)