To help you maintain adequate device performance during direct push, Microsoft recommends values for the various direct push settings.
Heartbeat Interval
The heartbeat interval is set on the device by the mobile operator. Using a heartbeat interval of 30 minutes has positive implications for battery life and bandwidth consumption. When direct push sessions are permitted to live longer (such as 30 minutes), there are fewer HTTP round trips, less data sent and received, and less power consumed by the device.
A heartbeat interval that is too short will keep the user always up to date, but will shorten battery life because of the constant pinging to the server.
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