code: def allowed_target_sdp_states(self):
          
          _current_state = self._sdp_state.current_state
          _allowed_target_states = self._sdp_state.allowed_target_states[
              _current_state]
          return json.dumps(dict(allowed_target_sdp_states=
                                 _allowed_target_states))
docs: Return a list of allowed target states for the current state.