Push Notification allows an application to listen for messages being pushed to it from the server. Our apps can provide uses even when they aren’t running. It can receive message and alert you that new event had occurred even if you are busy doing other things or the smartphone is in sleep mode.
Apple & Google have worked around these limitations with a push-based design. They have come up with the concept of an intermediate server, namely APNS (Apple Push Notifications Service) and Google C2DM (Cloud To Device Messaging), to handle all push notifications between the device and the third party servers. Rather than forcing your app to remain open and constantly querying for updates, device OS (iOS and Android) itself instead listens for updates and notifies your application as and when they arrive. The result is decreased processor, memory, and battery use.
The camera takes motion detection as an “alert”. If any alert occurs, the camera can trigger an event and send the alert to Push Server. The Push Server generates a push message and sends to the smartphone.
If the camera motion detection trigger an alarm, the smartphone can receive a message push. You can block the alert in event settings of APP for avoiding interruptions.