code: public void unsubscribe_event(final DeviceProxy deviceProxy, final int event_id) throws DevFailed {
          try {
              EventConsumerUtil.getInstance().unsubscribe_event(event_id);
          } catch (final DevFailed e) {
              throw e;
          } catch (final Exception e) {
              Except.throw_communication_failed(e.toString(), "Unsubsrcibe event on event ID "
                  + event_id + " Failed !", "DeviceProxy.unsubscribe_event()");
          }
      }
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