code: public boolean enable(Jid pushJid, String node, HashMap<String, String> publishOptions)
              throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
          EnablePushNotificationsIQ enablePushNotificationsIQ = new EnablePushNotificationsIQ(pushJid, node,
                  publishOptions);
          return changePushNotificationsStatus(enablePushNotificationsIQ);
      }
docs: Enable push notifications.
  
  @param pushJid
  @param node
  @param publishOptions
  @return true if it was successfully enabled, false if not
  @throws NoResponseException
  @throws XMPPErrorException
  @throws NotConnectedException
  @throws InterruptedException