WSO2 EMM uses various notification methods to send the device its corresponding list of pending operations. The notification method will vary based on the type of the mobile OS.
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Android
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notification methods
Android WSO2 EMM uses the following two notification methods for devices that use Android mobile OS:
GCM
The Google Cloud Messaging (GCM) notification method uses the GCM server to wake-up the Android device. If the notification type is set to GCM, when there are pending operations that need to be enforced on a device, WSO2 EMM server will send a push notification to the GCM server and the GCM server will in-turn send the message to the respective Android device. The latter mentioned push notification will contain an empty payloadAgent that is within the Android device. When the Android device Agent receives the push notification, it will communicate with the WSO2 EMM server and receive the list of pending operations that need to be enforced on the Android device.
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The local notification method will not use Google Cloud Messaging (GCM), but it will use its own local push notification service. The Android Agent within the Android device will trigger a wake-up command every one minute. The wake-up command will be triggered periodically based on the notifier frequency, which determines the time period after which the wake-up command will be automatically triggered by the Android Agent. The notifier frequency needs to be specified in milliseconds (ms) when configuring Android tenant based settings. The default notifier frequency is 60000ms, which translates to one minute.
When the wake-up command is triggered the Android device Agent will communicate with the WSO2 EMM server and receive the list of pending operations that need to be executed on the respective device.
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If you wish to only enable both GCM and Local notification method, you need to select GCM as the notification type and set the notifier frequency to a value greater than zero.
iOS notification method
WSO2 EMM uses only the following notification method for devices that use iOS mobile OS:
APNS
The Apple Push Notification Service (APNS) notification method uses the APNS server to wake-up the iOS device. When there are pending operations that need to be enforced on a device, WSO2 EMM server will send a push notification to the APNS server and the APNS server will in-turn send the message to the respective iOS client that is within the iOS device. When the iOS client receives the push notification, it will communicate with WSO2 EMM server and receive the list of pending operations that need to be enforced on the iOS device.