The on demand policy causes message transmission to occur only when instructed to do so by an application.
An application forces a message transmission to occur by calling TriggerSendReceive().
When the agent receives a Push Notification or a Network Status Change Notification, a corresponding message is sent to the system queue. This allows an application to detect these events and force a message transmission by calling TriggerSendReceive().
For more information about handling push notifications and network status changes, see System queue.
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