android - aerogear push notification not receiving in devices -

i doing poc push notification example given in github . hosted unified push server in openshift. registration , sending push notification unified push server console successful(status of message , registration count increased). device not receiving these notification.

anyone having idea might wrong?

i using android lollipop.

thanks in advance

first of all, when sent out messages, did filter out users using "alias"? common issue experiences supporting app teams.