- Add utilities to manage TangoAttributes & TangoCommand
- Add TangoPVFactory and TangoPV that manage attributes and commands
- Add managements of Tango waveform and image attributes
- Retrieve meta data, description, min alarm, max alarm, unit, min warning , max warning, min value, max value and number format
- Retrieve enumated attributes labels
- Retrieve Attribute Severity 
- Manage read or write information
- Manage attribute DevState as a String PV and update the Severity (according to 14 states of Tango)

- Event is not necessary activated, so subscription to event generates an exception
- Manage polling mode , in case of event is disable
- Manage Tango Command, with no argument , a void command is executed behind a Action Button widget